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-rw-r--r--.envrc7
-rw-r--r--.gitignore6
-rw-r--r--.travis.yml9
-rw-r--r--LICENSE21
-rw-r--r--README.md15
-rw-r--r--ci-builds.nix17
-rw-r--r--default.nix51
-rwxr-xr-xinfra/dns/import11
-rw-r--r--infra/dns/kontemplate-works15
-rw-r--r--infra/dns/oslo-pub8
-rw-r--r--infra/dns/root-tazj-in28
-rw-r--r--infra/gcp/.gitignore3
-rw-r--r--infra/gcp/default.tf103
-rw-r--r--infra/kubernetes/gemma/config.lisp19
-rw-r--r--infra/kubernetes/https-cert/cert.yaml8
-rw-r--r--infra/kubernetes/https-lb/ingress.yaml24
-rw-r--r--infra/kubernetes/nginx/nginx.conf43
-rw-r--r--infra/kubernetes/nginx/nginx.yaml55
-rw-r--r--infra/kubernetes/nixery/config.yaml67
-rw-r--r--infra/kubernetes/nixery/id_nixery.pub1
-rw-r--r--infra/kubernetes/nixery/known_hosts2
-rw-r--r--infra/kubernetes/nixery/secrets.yaml18
-rw-r--r--infra/kubernetes/nixery/ssh_config4
-rw-r--r--infra/kubernetes/primary-cluster.yaml33
-rw-r--r--infra/kubernetes/tazblog/config.yaml34
-rw-r--r--overrides/buildGo.nix6
-rw-r--r--overrides/elmPackages.nix10
-rw-r--r--overrides/kontemplate.nix14
-rw-r--r--overrides/lispPackages/default.nix8
-rw-r--r--overrides/lispPackages/quicklisp-to-nix-output/cl-prevalence.nix27
-rw-r--r--overrides/lispPackages/quicklisp-to-nix-output/s-sysdeps.nix25
-rw-r--r--overrides/lispPackages/quicklisp-to-nix-output/s-xml.nix27
-rw-r--r--overrides/lispPackages/quicklisp.nix26
-rw-r--r--overrides/writeElispBin.nix23
-rw-r--r--read-tree.nix54
-rw-r--r--secrets/nixery-gcs-jsonbin0 -> 2416 bytes
-rw-r--r--secrets/nixery-gcs-pembin0 -> 3214 bytes
-rw-r--r--secrets/nixery-ssh-privatebin0 -> 1906 bytes
-rw-r--r--services/gemma/CODE_OF_CONDUCT.md20
-rw-r--r--services/gemma/LICENSE674
-rw-r--r--services/gemma/README.markdown96
-rw-r--r--services/gemma/build.lisp5
-rw-r--r--services/gemma/config.lisp21
-rw-r--r--services/gemma/default.nix61
-rw-r--r--services/gemma/frontend/Main.elm221
-rw-r--r--services/gemma/frontend/elm-package.json17
-rw-r--r--services/gemma/gemma.asd33
-rw-r--r--services/gemma/src/gemma.lisp192
-rw-r--r--services/nixcon-demo/Cargo.lock905
-rw-r--r--services/nixcon-demo/Cargo.toml8
-rw-r--r--services/nixcon-demo/default.nix3
-rw-r--r--services/nixcon-demo/src/main.rs19
-rw-r--r--services/tazblog/blog/Main.hs24
-rw-r--r--services/tazblog/default.nix18
-rw-r--r--services/tazblog/shell.nix11
-rw-r--r--services/tazblog/src/Blog.hs141
-rw-r--r--services/tazblog/src/BlogStore.hs182
-rw-r--r--services/tazblog/src/RSS.hs48
-rw-r--r--services/tazblog/src/Server.hs81
-rw-r--r--services/tazblog/static/apple-touch-icon.pngbin0 -> 9756 bytes
-rw-r--r--services/tazblog/static/blog.css35
-rw-r--r--services/tazblog/static/favicon.icobin0 -> 4354 bytes
-rw-r--r--services/tazblog/static/keybase.txt69
-rw-r--r--services/tazblog/tazblog.cabal39
-rw-r--r--services/tazblog/tazblog.nix30
-rw-r--r--third_party/README.md13
-rw-r--r--third_party/default.nix75
-rw-r--r--third_party/gopkgs/cloud.google.com/go/default.nix12
-rw-r--r--third_party/gopkgs/github.com/golang/protobuf/default.nix12
-rw-r--r--third_party/gopkgs/github.com/googleapis/gax-go/default.nix19
-rw-r--r--third_party/gopkgs/github.com/hashicorp/golang-lru/default.nix14
-rw-r--r--third_party/gopkgs/go.opencensus.io/default.nix14
-rw-r--r--third_party/gopkgs/golang.org/x/net/default.nix15
-rw-r--r--third_party/gopkgs/golang.org/x/oauth2/default.nix14
-rw-r--r--third_party/gopkgs/golang.org/x/sys/default.nix12
-rw-r--r--third_party/gopkgs/golang.org/x/text/default.nix12
-rw-r--r--third_party/gopkgs/google.golang.org/api/default.nix20
-rw-r--r--third_party/gopkgs/google.golang.org/genproto/default.nix14
-rw-r--r--third_party/gopkgs/google.golang.org/grpc/default.nix21
-rw-r--r--third_party/naersk/default.nix9
-rw-r--r--third_party/nixery/default.nix18
-rw-r--r--third_party/ormolu/default.nix8
-rw-r--r--third_party/terraform-gcp/default.nix3
-rw-r--r--tools/aoc2019/default.nix22
-rw-r--r--tools/aoc2019/solution-day1.el28
-rw-r--r--tools/aoc2019/solution-day2.el53
-rw-r--r--tools/aoc2019/solution-day3.el58
-rwxr-xr-xtools/bin/__dispatch.sh40
l---------tools/bin/aoc20191
l---------tools/bin/blog_cli1
l---------tools/bin/kontemplate1
l---------tools/bin/pass1
l---------tools/bin/stern1
l---------tools/bin/terraform1
-rw-r--r--tools/blog_cli/README.md41
-rw-r--r--tools/blog_cli/default.nix9
-rw-r--r--tools/blog_cli/main.go209
-rw-r--r--tools/gotest/default.nix27
-rw-r--r--tools/gotest/lib.go11
-rw-r--r--tools/gotest/main.go16
-rw-r--r--tools/gotest/test.proto9
-rw-r--r--tools/kms_pass.nix60
102 files changed, 4669 insertions, 0 deletions
diff --git a/.envrc b/.envrc
new file mode 100644
index 000000000000..6b3ce7ebbb1e
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,7 @@
+# Configure the local PATH to contain tools which are fetched ad-hoc
+# from Nix.
+
+export PATH="${PWD}/tools/bin:${PATH}"
+export NIX_PATH="nixpkgs=${PWD}/default.nix"
+export REPO_ROOT="${PWD}"
+export SECRETS_DIR="${PWD}/secrets"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 000000000000..3afe2d6acf13
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+# Ignore various bazel output folders
+bazel-*
+
+# Ignore Nix result symlinks
+result
+result-*
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 000000000000..2ab57adb5906
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: nix
+nix: 2.2.2
+env:
+  - NIX_PATH="nixpkgs=${TRAVIS_BUILD_DIR}"
+before_script:
+  - nix-env -f '<nixpkgs>' -iA third_party.cachix
+  - cachix use tazjin
+script:
+  - nix-build ci-builds.nix | cachix push tazjin
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 000000000000..904a76ed0488
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2019 Vincent Ambo
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 000000000000..dc4b7f79e65f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,15 @@
+depot
+=====
+
+[![Build Status](https://travis-ci.org/tazjin/depot.svg?branch=master)](https://travis-ci.org/tazjin/depot)
+
+This repository is the [monorepo][] for my personal infrastructure. It is built
+using [Nix][] and services are deployed on Google Cloud Platofrm using
+[Nixery][].
+
+Everything in here is MIT-licensed unless otherwise indicated in a service
+subfolder.
+
+[monorepo]: https://en.wikipedia.org/wiki/Monorepo
+[Nix]: https://nixos.org/nix
+[Nixery]: https://github.com/google/nixery
diff --git a/ci-builds.nix b/ci-builds.nix
new file mode 100644
index 000000000000..916317ea56f0
--- /dev/null
+++ b/ci-builds.nix
@@ -0,0 +1,17 @@
+# This file is invoked by the CI build and recursively filters the
+# package set for attributes that should be built automatically.
+#
+# Packages can be opted-in to being built by CI by setting
+# `meta.enableCI = true`.
+#
+# TODO(tazjin): Actually implement the above.
+
+let
+  pkgs = import ./default.nix;
+in with pkgs; [
+  services.tazblog
+  services.nixcon-demo
+  tools.kms_pass
+  tools.blog_cli
+]
+
diff --git a/default.nix b/default.nix
new file mode 100644
index 000000000000..b53aadcaf2e8
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,51 @@
+# This file sets up the top-level package set by traversing the package tree
+# (see read-tree.nix for details) and constructing a matching attribute set
+# tree.
+#
+# This makes packages accessible via the Nixery instance that is configured to
+# use this repository as its nixpkgs source.
+
+{ ... }@args:
+
+with builtins;
+
+let
+  # This definition of fix is identical to <nixpkgs>.lib.fix, but the global
+  # package set is not available here.
+  fix = f: let x = f x; in x;
+
+  # Global configuration that all packages are called with.
+  config = pkgs: {
+    inherit pkgs;
+
+    kms = {
+      project = "tazjins-infrastructure";
+      region = "europe-north1";
+      keyring = "tazjins-keys";
+      key = "kontemplate-key";
+    };
+  };
+
+  readTree' = import ./read-tree.nix;
+
+  localPkgs = readTree: {
+    services    = readTree ./services;
+    tools       = readTree ./tools;
+    third_party = readTree ./third_party;
+  };
+in fix(self: {
+  config = config self;
+
+  # Elevate 'lib' from nixpkgs
+  lib = import (self.third_party.nixpkgsSrc + "/lib");
+}
+
+# Add local packages as structured by readTree
+// (localPkgs (readTree' self.config))
+
+# Load overrides into the top-level.
+#
+# This can be used to move things from third_party into the top-level, too (such
+# as `lib`).
+// (readTree' self.config) ./overrides
+)
diff --git a/infra/dns/import b/infra/dns/import
new file mode 100755
index 000000000000..e79e426b5553
--- /dev/null
+++ b/infra/dns/import
@@ -0,0 +1,11 @@
+#!/bin/sh
+set -ue
+
+# Imports a zone file into a Google Cloud DNS zone of the same name
+readonly ZONE="${1}"
+
+gcloud dns record-sets import "${ZONE}" \
+       --project composite-watch-759 \
+       --zone-file-format \
+       --delete-all-existing \
+       --zone "${ZONE}"
diff --git a/infra/dns/kontemplate-works b/infra/dns/kontemplate-works
new file mode 100644
index 000000000000..326a129d2105
--- /dev/null
+++ b/infra/dns/kontemplate-works
@@ -0,0 +1,15 @@
+;;  -*- mode: zone; -*-
+;; Do not delete these
+kontemplate.works. 21600 IN NS ns-cloud-d1.googledomains.com.
+kontemplate.works. 21600 IN NS ns-cloud-d2.googledomains.com.
+kontemplate.works. 21600 IN NS ns-cloud-d3.googledomains.com.
+kontemplate.works. 21600 IN NS ns-cloud-d4.googledomains.com.
+kontemplate.works. 21600 IN SOA ns-cloud-d1.googledomains.com. cloud-dns-hostmaster.google.com. 4 21600 3600 259200 300
+
+;; Github site setup
+kontemplate.works. 60 IN A 185.199.108.153
+kontemplate.works. 60 IN A 185.199.109.153
+kontemplate.works. 60 IN A 185.199.110.153
+kontemplate.works. 60 IN A 185.199.111.153
+
+www.kontemplate.works. 60 IN CNAME tazjin.github.io.
diff --git a/infra/dns/oslo-pub b/infra/dns/oslo-pub
new file mode 100644
index 000000000000..674687484b90
--- /dev/null
+++ b/infra/dns/oslo-pub
@@ -0,0 +1,8 @@
+;; Do not delete these
+oslo.pub. 21600 IN NS ns-cloud-c1.googledomains.com.
+oslo.pub. 21600 IN NS ns-cloud-c2.googledomains.com.
+oslo.pub. 21600 IN NS ns-cloud-c3.googledomains.com.
+oslo.pub. 21600 IN NS ns-cloud-c4.googledomains.com.
+oslo.pub. 21600 IN SOA ns-cloud-c1.googledomains.com. cloud-dns-hostmaster.google.com. 4 21600 3600 1209600 300
+
+oslo.pub. 60 IN A 46.21.106.241
diff --git a/infra/dns/root-tazj-in b/infra/dns/root-tazj-in
new file mode 100644
index 000000000000..80ea9e298e70
--- /dev/null
+++ b/infra/dns/root-tazj-in
@@ -0,0 +1,28 @@
+;; Do not delete these
+tazj.in. 21600 IN NS ns-cloud-a1.googledomains.com.
+tazj.in. 21600 IN NS ns-cloud-a2.googledomains.com.
+tazj.in. 21600 IN NS ns-cloud-a3.googledomains.com.
+tazj.in. 21600 IN NS ns-cloud-a4.googledomains.com.
+tazj.in. 21600 IN SOA ns-cloud-a1.googledomains.com. cloud-dns-hostmaster.google.com. 109 21600 3600 1209600 300
+
+;; Email setup
+tazj.in. 300 IN MX 10 mx.runbox.com.
+tazj.in. 300 IN TXT "v=spf1 redirect=spf.runbox.com"
+
+;; Site verifications
+tazj.in. 3600 IN TXT "keybase-site-verification=gC4kzEmnLzY7F669PjN-pw2Cf__xHqcxQ08Gb-W9dhE"
+tazj.in. 3600 IN TXT "google-site-verification=8ila9SmLtwSOlciHpmst-RG_Z-peiV5PevEVyaeL0Z0"
+tazj.in. 3600 IN TXT "detectify-verification=b2eab87b05e615c13d8907d47eddfcad"
+www.tazj.in. 3600 IN TXT "keybase-site-verification=ER8m_byyqAhzeIy9TyzkAU1H2p2yHtpvImuB_XrRF2U"
+
+;; Webpage records setup
+tazj.in. 300 IN A 46.21.106.241
+www.tazj.in. 300 IN A 46.21.106.241
+git.tazj.in. 300 IN A 46.21.106.241
+gemma.tazj.in. 300 IN A 46.21.106.241
+
+files.tazj.in. 300 IN CNAME c.storage.googleapis.com.
+ip.tazj.in. 300 IN A 104.155.119.229
+
+;; GleSYS machines
+sto-tazserve-1.tazj.in. 300 IN A 46.21.106.241
diff --git a/infra/gcp/.gitignore b/infra/gcp/.gitignore
new file mode 100644
index 000000000000..96c7538dda8a
--- /dev/null
+++ b/infra/gcp/.gitignore
@@ -0,0 +1,3 @@
+.terraform
+*.tfstate
+*.tfstate.backup
diff --git a/infra/gcp/default.tf b/infra/gcp/default.tf
new file mode 100644
index 000000000000..d13345393bd4
--- /dev/null
+++ b/infra/gcp/default.tf
@@ -0,0 +1,103 @@
+# Terraform configuration for the GCP project 'tazjins-infrastructure'
+
+provider "google" {
+  project = "tazjins-infrastructure"
+  region  = "europe-north1"
+}
+
+# Configure a storage bucket in which to keep Terraform state and
+# other data, such as Nixery's layers.
+resource "google_storage_bucket" "tazjins-data" {
+  name     = "tazjins-data"
+  location = "EU"
+}
+
+terraform {
+  backend "gcs" {
+    bucket = "tazjins-data"
+    prefix = "terraform"
+  }
+}
+
+# Configure enabled APIs
+resource "google_project_services" "primary" {
+  project = "tazjins-infrastructure"
+  services = [
+    "bigquery-json.googleapis.com",
+    "bigquerystorage.googleapis.com",
+    "cloudapis.googleapis.com",
+    "clouddebugger.googleapis.com",
+    "cloudkms.googleapis.com",
+    "cloudtrace.googleapis.com",
+    "compute.googleapis.com",
+    "container.googleapis.com",
+    "containerregistry.googleapis.com",
+    "datastore.googleapis.com",
+    "dns.googleapis.com",
+    "iam.googleapis.com",
+    "iamcredentials.googleapis.com",
+    "logging.googleapis.com",
+    "monitoring.googleapis.com",
+    "oslogin.googleapis.com",
+    "pubsub.googleapis.com",
+    "servicemanagement.googleapis.com",
+    "serviceusage.googleapis.com",
+    "sourcerepo.googleapis.com",
+    "sql-component.googleapis.com",
+    "storage-api.googleapis.com",
+    "storage-component.googleapis.com",
+  ]
+}
+
+
+# Configure the main Kubernetes cluster in which services are deployed
+resource "google_container_cluster" "primary" {
+  name     = "tazjin-cluster"
+  location = "europe-north1"
+
+  remove_default_node_pool = true
+  initial_node_count       = 1
+}
+
+resource "google_container_node_pool" "primary_nodes" {
+  name       = "primary-nodes"
+  location   = "europe-north1"
+  cluster    = google_container_cluster.primary.name
+  node_count = 1
+
+  node_config {
+    preemptible  = true
+    machine_type = "n1-standard-2"
+
+    oauth_scopes = [
+      "storage-rw",
+      "logging-write",
+      "monitoring",
+    ]
+  }
+}
+
+# Configure a service account for which GCS URL signing keys can be created.
+resource "google_service_account" "nixery" {
+  account_id   = "nixery"
+  display_name = "Nixery service account"
+}
+
+# Configure Cloud KMS for secret encryption
+resource "google_kms_key_ring" "tazjins_keys" {
+  name     = "tazjins-keys"
+  location = "europe-north1"
+
+  lifecycle {
+    prevent_destroy = true
+  }
+}
+
+resource "google_kms_crypto_key" "kontemplate_key" {
+  name     = "kontemplate-key"
+  key_ring = google_kms_key_ring.tazjins_keys.id
+
+  lifecycle {
+    prevent_destroy = true
+  }
+}
diff --git a/infra/kubernetes/gemma/config.lisp b/infra/kubernetes/gemma/config.lisp
new file mode 100644
index 000000000000..517a658cf150
--- /dev/null
+++ b/infra/kubernetes/gemma/config.lisp
@@ -0,0 +1,19 @@
+(config :port 4242
+        :data-dir "/var/lib/gemma/")
+
+(deftask bathroom/wipe-mirror 7)
+(deftask bathroom/wipe-counter 7)
+
+;; Bedroom tasks
+(deftask bedroom/change-sheets 7)
+(deftask bedroom/vacuum 10)
+
+;; Kitchen tasks
+(deftask kitchen/normal-trash 3)
+(deftask kitchen/green-trash 5)
+(deftask kitchen/blue-trash 5)
+(deftask kitchen/wipe-counters 3)
+(deftask kitchen/vacuum 5 "Kitchen has more crumbs and such!")
+
+;; Entire place
+(deftask clean-windows 60)
diff --git a/infra/kubernetes/https-cert/cert.yaml b/infra/kubernetes/https-cert/cert.yaml
new file mode 100644
index 000000000000..c7a85275ae67
--- /dev/null
+++ b/infra/kubernetes/https-cert/cert.yaml
@@ -0,0 +1,8 @@
+---
+apiVersion: networking.gke.io/v1beta1
+kind: ManagedCertificate
+metadata:
+  name: {{ .domain | replace "." "-" }}
+spec:
+  domains:
+    - {{ .domain }}
diff --git a/infra/kubernetes/https-lb/ingress.yaml b/infra/kubernetes/https-lb/ingress.yaml
new file mode 100644
index 000000000000..f1d9fa4270b0
--- /dev/null
+++ b/infra/kubernetes/https-lb/ingress.yaml
@@ -0,0 +1,24 @@
+# This resource configures the HTTPS load balancer that is used as the
+# entrypoint to all HTTPS services running in the cluster.
+---
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: https-ingress
+  annotations:
+    networking.gke.io/managed-certificates: tazj-in, www-tazj-in, oslo-pub
+spec:
+  # Default traffic is routed to the blog, in case people go to
+  # peculiar hostnames.
+  backend:
+    serviceName: tazblog
+    servicePort: 8000
+  rules:
+    # Route oslo.pub to the nginx instance which serves redirects
+    - host: oslo.pub
+      http:
+        paths:
+          - path: /
+            backend:
+              serviceName: nginx
+              servicePort: 6756
diff --git a/infra/kubernetes/nginx/nginx.conf b/infra/kubernetes/nginx/nginx.conf
new file mode 100644
index 000000000000..5a008a0b953f
--- /dev/null
+++ b/infra/kubernetes/nginx/nginx.conf
@@ -0,0 +1,43 @@
+daemon off;
+worker_processes  1;
+error_log stderr;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+    log_format json_combined escape=json
+    '{'
+        '"time_local":"$time_local",'
+        '"remote_addr":"$remote_addr",'
+        '"remote_user":"$remote_user",'
+        '"request":"$request",'
+        '"status": "$status",'
+        '"body_bytes_sent":"$body_bytes_sent",'
+        '"request_time":"$request_time",'
+        '"http_referrer":"$http_referer",'
+        '"http_user_agent":"$http_user_agent"'
+        '}';
+
+    access_log /dev/stdout json_combined;
+
+    sendfile        on;
+    keepalive_timeout  65;
+
+    server {
+        listen 80 default_server;
+        location / {
+            return 200 "ok";
+        }
+    }
+
+    server {
+        listen       80;
+        server_name  oslo.pub;
+
+        location / {
+            return 302 https://www.google.com/maps/d/viewer?mid=1pJIYY9cuEdt9DuMTbb4etBVq7hs;
+        }
+    }
+}
diff --git a/infra/kubernetes/nginx/nginx.yaml b/infra/kubernetes/nginx/nginx.yaml
new file mode 100644
index 000000000000..d0ee520d2734
--- /dev/null
+++ b/infra/kubernetes/nginx/nginx.yaml
@@ -0,0 +1,55 @@
+# Deploy an nginx instance which serves ... redirects.
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-conf
+data:
+  nginx.conf: {{ insertFile "nginx.conf" | toJson }}
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx
+  labels:
+    app: nginx
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+        config: {{ insertFile "nginx.conf" | sha1sum }}
+    spec:
+      containers:
+        - name: tazblog
+          image: nixery.local/shell/nginx:{{ .version }}
+          command: ["/bin/bash", "-c"]
+          args:
+            - |
+              echo 'nogroup:x:30000:nobody' >> /etc/group
+              echo 'nobody:x:30000:30000:nobody:/tmp:/bin/bash' >> /etc/passwd
+              exec nginx -c /etc/nginx/nginx.conf
+          volumeMounts:
+            - name: nginx-conf
+              mountPath: /etc/nginx
+      volumes:
+        - name: nginx-conf
+          configMap:
+            name: nginx-conf
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx
+spec:
+  type: NodePort
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 6756
+      targetPort: 80
diff --git a/infra/kubernetes/nixery/config.yaml b/infra/kubernetes/nixery/config.yaml
new file mode 100644
index 000000000000..0775e79b5843
--- /dev/null
+++ b/infra/kubernetes/nixery/config.yaml
@@ -0,0 +1,67 @@
+# Deploys an instance of Nixery into the cluster.
+#
+# The service via which Nixery is exposed has a private DNS entry
+# pointing to it, which makes it possible to resolve `nixery.local`
+# in-cluster without things getting nasty.
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nixery
+  namespace: kube-public
+  labels:
+    app: nixery
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: nixery
+  template:
+    metadata:
+      labels:
+        app: nixery
+    spec:
+      containers:
+      - name: nixery
+        image: eu.gcr.io/tazjins-infrastructure/nixery:{{ .version }}
+        volumeMounts:
+          - name: nixery-secrets
+            mountPath: /var/nixery
+        env:
+          - name: BUCKET
+            value: {{ .bucket}}
+          - name: PORT
+            value: "{{ .port }}"
+          - name: GOOGLE_APPLICATION_CREDENTIALS
+            value: /var/nixery/gcs-key.json
+          - name: GCS_SIGNING_KEY
+            value: /var/nixery/gcs-key.pem
+          - name: GCS_SIGNING_ACCOUNT
+            value: {{ .account }}
+          - name: GIT_SSH_COMMAND
+            value: 'ssh -F /var/nixery/ssh_config'
+          - name: NIXERY_PKGS_REPO
+            value: {{ .repo }}
+          - name: NIX_POPULARITY_URL
+            value: 'https://storage.googleapis.com/nixery-layers/popularity/{{ .popularity }}'
+      volumes:
+        - name: nixery-secrets
+          secret:
+            secretName: nixery-secrets
+            defaultMode: 256
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: nixery
+  namespace: kube-public
+  annotations:
+    cloud.google.com/load-balancer-type: "Internal"
+spec:
+  selector:
+    app: nixery
+  type: LoadBalancer
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8080
diff --git a/infra/kubernetes/nixery/id_nixery.pub b/infra/kubernetes/nixery/id_nixery.pub
new file mode 100644
index 000000000000..dc3fd617d0a1
--- /dev/null
+++ b/infra/kubernetes/nixery/id_nixery.pub
@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCzBM6ydst77jDHNcTFWKD9Fw4SReqyNEEp2MtQBk2wt94U4yLp8MQIuNeOEn1GaDEX4RGCxqai/2UVF1w9ZNdU+v2fXcKWfkKuGQH2XcNfXor2cVNObd40H78++iZiv3nmM/NaEdkTbTBbi925cRy9u5FgItDgsJlyKNRglCb0fr6KlgpvWjL20dp/eeZ8a/gLniHK8PnEsgERQSvJnsyFpxxVhxtoUiyLWpXDl4npf/rQr0eRDf4Q5sN/nbTwksapPHfze8dKcaoA7A2NqT3bJ6DPGrwVCzGRtGw/SXJwFwmmtAl9O6BklpeReyiknSxc+KOtrjDW6O0r6yvymD5Z nixery
diff --git a/infra/kubernetes/nixery/known_hosts b/infra/kubernetes/nixery/known_hosts
new file mode 100644
index 000000000000..6a2f84b5fb60
--- /dev/null
+++ b/infra/kubernetes/nixery/known_hosts
@@ -0,0 +1,2 @@
+github.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
+140.82.118.4 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==
diff --git a/infra/kubernetes/nixery/secrets.yaml b/infra/kubernetes/nixery/secrets.yaml
new file mode 100644
index 000000000000..d9a674d2c9fc
--- /dev/null
+++ b/infra/kubernetes/nixery/secrets.yaml
@@ -0,0 +1,18 @@
+# The secrets below are encrypted using keys stored in Cloud KMS and
+# templated in by kontemplate when deploying.
+#
+# Not all of the values are actually secret (see the matching)
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: nixery-secrets
+  namespace: kube-public
+type: Opaque
+data:
+  gcs-key.json: {{ passLookup "nixery-gcs-json" | b64enc }}
+  gcs-key.pem: {{ passLookup "nixery-gcs-pem" | b64enc }}
+  id_nixery: {{ printf "%s\n" (passLookup "nixery-ssh-private") | b64enc }}
+  id_nixery.pub: {{ insertFile "id_nixery.pub" | b64enc }}
+  known_hosts: {{ insertFile "known_hosts" | b64enc }}
+  ssh_config: {{ insertFile "ssh_config" | b64enc }}
diff --git a/infra/kubernetes/nixery/ssh_config b/infra/kubernetes/nixery/ssh_config
new file mode 100644
index 000000000000..78afbb0b039d
--- /dev/null
+++ b/infra/kubernetes/nixery/ssh_config
@@ -0,0 +1,4 @@
+Match host *
+      User tazjin@google.com
+      IdentityFile /var/nixery/id_nixery
+      UserKnownHostsFile /var/nixery/known_hosts
diff --git a/infra/kubernetes/primary-cluster.yaml b/infra/kubernetes/primary-cluster.yaml
new file mode 100644
index 000000000000..bb1a6b2b0531
--- /dev/null
+++ b/infra/kubernetes/primary-cluster.yaml
@@ -0,0 +1,33 @@
+# Kontemplate configuration for the primary GKE cluster in the project
+# 'tazjins-infrastructure'.
+---
+context: gke_tazjins-infrastructure_europe-north1_tazjin-cluster
+include:
+  # SSL certificates (provisioned by Google)
+  - name: tazj-in-cert
+    path: https-cert
+    values:
+      domain: tazj.in
+  - name: www-tazj-in-cert
+    path: https-cert
+    values:
+      domain: www.tazj.in
+  - name: oslo-pub-cert
+    path: https-cert
+    values:
+      domain: oslo.pub
+
+  # Services
+  - name: nixery
+    values:
+      port: 8080
+      version: as6056ijn2scvzq8n1i2nlqwc5kddp1s
+      bucket: tazjins-data
+      account: nixery@tazjins-infrastructure.iam.gserviceaccount.com
+      repo: git@github.com:tazjin/depot.git
+      popularity: 'popularity-19.09.891.80b42e630b2.json'
+  - name: tazblog
+  - name: https-lb
+  - name: nginx
+    values:
+      version: 52fabe4423095f12f67be1c7dbf88b801c1bb521
diff --git a/infra/kubernetes/tazblog/config.yaml b/infra/kubernetes/tazblog/config.yaml
new file mode 100644
index 000000000000..165a30f6839b
--- /dev/null
+++ b/infra/kubernetes/tazblog/config.yaml
@@ -0,0 +1,34 @@
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: tazblog
+  labels:
+    app: tazblog
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: tazblog
+  template:
+    metadata:
+      labels:
+        app: tazblog
+    spec:
+      containers:
+      - name: tazblog
+        image: nixery.local/shell/services.tazblog:{{ gitHEAD }}
+        command: [ "tazblog" ]
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: tazblog
+spec:
+  type: NodePort
+  selector:
+    app: tazblog
+  ports:
+    - protocol: TCP
+      port: 8000
+      targetPort: 8000
diff --git a/overrides/buildGo.nix b/overrides/buildGo.nix
new file mode 100644
index 000000000000..4a638effb88e
--- /dev/null
+++ b/overrides/buildGo.nix
@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+
+(import "${builtins.fetchGit {
+  url = "https://github.com/tazjin/buildGo.nix";
+  rev = "7f74980457df843aea542510a406f34366e8b868";
+}}/buildGo.nix") { pkgs = pkgs.third_party; }
diff --git a/overrides/elmPackages.nix b/overrides/elmPackages.nix
new file mode 100644
index 000000000000..20026d9180ea
--- /dev/null
+++ b/overrides/elmPackages.nix
@@ -0,0 +1,10 @@
+# Gemma needs an older version of Elm to be built. Updating it to
+# the newer version is a lot of effort.
+{ pkgs, ... }:
+
+(import (pkgs.third_party.fetchFromGitHub {
+  owner = "NixOS";
+  repo = "nixpkgs";
+  rev = "14f9ee66e63077539252f8b4550049381a082518";
+  sha256 = "1wn7nmb1cqfk2j91l3rwc6yhimfkzxprb8wknw5wi57yhq9m6lv1";
+}) {}).elmPackages
diff --git a/overrides/kontemplate.nix b/overrides/kontemplate.nix
new file mode 100644
index 000000000000..40f6b68b2962
--- /dev/null
+++ b/overrides/kontemplate.nix
@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+let master = pkgs.third_party.kontemplate.overrideAttrs(_: {
+  src = pkgs.third_party.fetchFromGitHub {
+    owner = "tazjin";
+    repo = "kontemplate";
+    rev = "v1.8.0";
+    sha256 = "123mjmmm4hynraq1fpn3j5i0a1i87l265kkjraxxxbl0zacv74i1";
+  };
+});
+in pkgs.third_party.writeShellScriptBin "kontemplate" ''
+  export PATH="${pkgs.tools.kms_pass}/bin:$PATH"
+  exec ${master}/bin/kontemplate $@
+''
diff --git a/overrides/lispPackages/default.nix b/overrides/lispPackages/default.nix
new file mode 100644
index 000000000000..c6502975e310
--- /dev/null
+++ b/overrides/lispPackages/default.nix
@@ -0,0 +1,8 @@
+# One of Gemma's dependencies is missing in nixpkgs' Quicklisp
+# package set, it is overlaid locally here.
+{ pkgs, ... }:
+
+import ./quicklisp.nix {
+  inherit (pkgs) lib;
+  inherit (pkgs.third_party) lispPackages;
+}
diff --git a/overrides/lispPackages/quicklisp-to-nix-output/cl-prevalence.nix b/overrides/lispPackages/quicklisp-to-nix-output/cl-prevalence.nix
new file mode 100644
index 000000000000..4e5e3ec5d6e8
--- /dev/null
+++ b/overrides/lispPackages/quicklisp-to-nix-output/cl-prevalence.nix
@@ -0,0 +1,27 @@
+args @ { fetchurl, ... }:
+rec {
+  baseName = ''cl-prevalence'';
+  version = ''20130720-hg'';
+
+  description = ''Common Lisp Prevalence Package'';
+
+  deps = [ args."s-sysdeps" args."s-xml" ];
+
+  src = fetchurl {
+    url = ''http://beta.quicklisp.org/archive/cl-prevalence/2013-07-20/cl-prevalence-20130720-hg.tgz'';
+    sha256 = ''09pqbw6xcgy0242npiqw7sd8jwwjc0kz7m0sas48jjr0zgnnmi89'';
+  };
+
+  packageName = "cl-prevalence";
+
+  asdFilesToKeep = ["cl-prevalence.asd"];
+  overrides = x: x;
+}
+/* (SYSTEM cl-prevalence DESCRIPTION Common Lisp Prevalence Package SHA256
+    09pqbw6xcgy0242npiqw7sd8jwwjc0kz7m0sas48jjr0zgnnmi89 URL
+    http://beta.quicklisp.org/archive/cl-prevalence/2013-07-20/cl-prevalence-20130720-hg.tgz
+    MD5 6176c34b8e1621b65906b1575d9fa20d NAME cl-prevalence FILENAME
+    cl-prevalence DEPS
+    ((NAME s-sysdeps FILENAME s-sysdeps) (NAME s-xml FILENAME s-xml))
+    DEPENDENCIES (s-sysdeps s-xml) VERSION 20130720-hg SIBLINGS
+    (cl-prevalence-test) PARASITES NIL) */
diff --git a/overrides/lispPackages/quicklisp-to-nix-output/s-sysdeps.nix b/overrides/lispPackages/quicklisp-to-nix-output/s-sysdeps.nix
new file mode 100644
index 000000000000..1c28ec6e2afd
--- /dev/null
+++ b/overrides/lispPackages/quicklisp-to-nix-output/s-sysdeps.nix
@@ -0,0 +1,25 @@
+args @ { fetchurl, ... }:
+rec {
+  baseName = ''s-sysdeps'';
+  version = ''20130128-git'';
+
+  description = ''An abstraction layer over platform dependent functionality'';
+
+  deps = [ ];
+
+  src = fetchurl {
+    url = ''http://beta.quicklisp.org/archive/s-sysdeps/2013-01-28/s-sysdeps-20130128-git.tgz'';
+    sha256 = ''048q0mzypnm284bvv7036d4z7bv7rdcqks5l372s74kq279l2y00'';
+  };
+
+  packageName = "s-sysdeps";
+
+  asdFilesToKeep = ["s-sysdeps.asd"];
+  overrides = x: x;
+}
+/* (SYSTEM s-sysdeps DESCRIPTION
+    An abstraction layer over platform dependent functionality SHA256
+    048q0mzypnm284bvv7036d4z7bv7rdcqks5l372s74kq279l2y00 URL
+    http://beta.quicklisp.org/archive/s-sysdeps/2013-01-28/s-sysdeps-20130128-git.tgz
+    MD5 2fe61fadafd62ef9597e17b4783889ef NAME s-sysdeps FILENAME s-sysdeps DEPS
+    NIL DEPENDENCIES NIL VERSION 20130128-git SIBLINGS NIL PARASITES NIL) */
diff --git a/overrides/lispPackages/quicklisp-to-nix-output/s-xml.nix b/overrides/lispPackages/quicklisp-to-nix-output/s-xml.nix
new file mode 100644
index 000000000000..ec12dde52231
--- /dev/null
+++ b/overrides/lispPackages/quicklisp-to-nix-output/s-xml.nix
@@ -0,0 +1,27 @@
+args @ { fetchurl, ... }:
+rec {
+  baseName = ''s-xml'';
+  version = ''20150608-git'';
+
+  parasites = [ "s-xml.examples" "s-xml.test" ];
+
+  description = ''Simple Common Lisp XML Parser'';
+
+  deps = [ ];
+
+  src = fetchurl {
+    url = ''http://beta.quicklisp.org/archive/s-xml/2015-06-08/s-xml-20150608-git.tgz'';
+    sha256 = ''0cy36wqzasqma4maw9djq1vdwsp5hxq8svlbnhbv9sq9zzys5viq'';
+  };
+
+  packageName = "s-xml";
+
+  asdFilesToKeep = ["s-xml.asd"];
+  overrides = x: x;
+}
+/* (SYSTEM s-xml DESCRIPTION Simple Common Lisp XML Parser SHA256
+    0cy36wqzasqma4maw9djq1vdwsp5hxq8svlbnhbv9sq9zzys5viq URL
+    http://beta.quicklisp.org/archive/s-xml/2015-06-08/s-xml-20150608-git.tgz
+    MD5 9c31c80f0661777c493fab683f776716 NAME s-xml FILENAME s-xml DEPS NIL
+    DEPENDENCIES NIL VERSION 20150608-git SIBLINGS NIL PARASITES
+    (s-xml.examples s-xml.test)) */
diff --git a/overrides/lispPackages/quicklisp.nix b/overrides/lispPackages/quicklisp.nix
new file mode 100644
index 000000000000..1d23db762d34
--- /dev/null
+++ b/overrides/lispPackages/quicklisp.nix
@@ -0,0 +1,26 @@
+{ lib, lispPackages }:
+
+let inherit (lispPackages) buildLispPackage qlOverrides fetchurl;
+in lispPackages // lib.fix(self: {
+  "s-xml" = buildLispPackage
+    ((f: x: (x // (f x)))
+       (qlOverrides."s-xml" or (x: {}))
+       (import ./quicklisp-to-nix-output/s-xml.nix {
+         inherit fetchurl;
+       }));
+
+  "s-sysdeps" = buildLispPackage
+    ((f: x: (x // (f x)))
+       (qlOverrides."s-sysdeps" or (x: {}))
+       (import ./quicklisp-to-nix-output/s-sysdeps.nix {
+         inherit fetchurl;
+       }));
+
+  "cl-prevalence" = buildLispPackage
+    ((f: x: (x // (f x)))
+       (qlOverrides."cl-prevalence" or (x: {}))
+       (import ./quicklisp-to-nix-output/cl-prevalence.nix {
+         inherit fetchurl;
+         inherit (self) s-sysdeps s-xml;
+       }));
+})
diff --git a/overrides/writeElispBin.nix b/overrides/writeElispBin.nix
new file mode 100644
index 000000000000..abd39343dd91
--- /dev/null
+++ b/overrides/writeElispBin.nix
@@ -0,0 +1,23 @@
+{ pkgs, ... }:
+
+{ name, src, deps ? (_: []), emacs ? pkgs.third_party.emacs26-nox }:
+
+let
+  inherit (pkgs.third_party) emacsPackagesFor writeTextFile;
+  inherit (builtins) isString toFile;
+
+  finalEmacs = (emacsPackagesFor emacs).emacsWithPackages deps;
+
+  srcFile = if isString src
+    then toFile "${name}.el" src
+    else src;
+in writeTextFile {
+  inherit name;
+  executable = true;
+  destination = "/bin/${name}";
+
+  text = ''
+    #!/bin/sh
+    ${finalEmacs}/bin/emacs --batch --no-site-file --script ${srcFile} $@
+  '';
+}
diff --git a/read-tree.nix b/read-tree.nix
new file mode 100644
index 000000000000..2cdeb42aaafc
--- /dev/null
+++ b/read-tree.nix
@@ -0,0 +1,54 @@
+args: initPath:
+
+let
+  inherit (builtins)
+    attrNames
+    baseNameOf
+    filter
+    head
+    length
+    listToAttrs
+    map
+    match
+    isAttrs
+    readDir;
+
+  argsWithPath = parts: args // {
+    locatedAt = parts;
+  };
+
+  # The marker is added to every set that was imported directly by
+  # readTree.
+  importWithMark = path: parts:
+    let imported = import path (argsWithPath parts);
+    in if (isAttrs imported)
+      then imported // { __readTree = true; }
+      else imported;
+
+  nixFileName = file:
+    let res = match "(.*)\.nix" file;
+    in if res == null then null else head res;
+
+  readTree = path: parts:
+    let
+      dir = readDir path;
+      self = importWithMark path parts;
+      joinChild = c: path + ("/" + c);
+
+      # Import non-empty subdirectories
+      filterDir = f: dir."${f}" == "directory";
+      children = map (c: {
+        name = c;
+        value = readTree (joinChild c) (parts ++ [ c ]);
+      }) (filter filterDir (attrNames dir));
+
+      # Import Nix files
+      nixFiles = filter (f: f != null) (map nixFileName (attrNames dir));
+      nixChildren = map (c: let p = joinChild (c + ".nix"); in {
+        name = c;
+        value = importWithMark p (parts ++ [ c ]);
+      }) nixFiles;
+    in if dir ? "default.nix"
+      then self // (listToAttrs children)
+      else listToAttrs (nixChildren ++ children);
+in readTree initPath [ (baseNameOf initPath) ]
diff --git a/secrets/nixery-gcs-json b/secrets/nixery-gcs-json
new file mode 100644
index 000000000000..b8b544511685
--- /dev/null
+++ b/secrets/nixery-gcs-json
Binary files differdiff --git a/secrets/nixery-gcs-pem b/secrets/nixery-gcs-pem
new file mode 100644
index 000000000000..798a1e5a66f8
--- /dev/null
+++ b/secrets/nixery-gcs-pem
Binary files differdiff --git a/secrets/nixery-ssh-private b/secrets/nixery-ssh-private
new file mode 100644
index 000000000000..5c4ff2023350
--- /dev/null
+++ b/secrets/nixery-ssh-private
Binary files differdiff --git a/services/gemma/CODE_OF_CONDUCT.md b/services/gemma/CODE_OF_CONDUCT.md
new file mode 100644
index 000000000000..c4013ac13ebc
--- /dev/null
+++ b/services/gemma/CODE_OF_CONDUCT.md
@@ -0,0 +1,20 @@
+A SERMON ON ETHICS AND LOVE
+===========================
+
+One day Mal-2 asked the messenger spirit Saint Gulik to approach the Goddess and request Her presence for some desperate advice. Shortly afterwards the radio came on by itself, and an ethereal female Voice said **YES?**
+
+"O! Eris! Blessed Mother of Man! Queen of Chaos! Daughter of Discord! Concubine of Confusion! O! Exquisite Lady, I beseech You to lift a heavy burden from my heart!"
+
+**WHAT BOTHERS YOU, MAL? YOU DON'T SOUND WELL.**
+
+"I am filled with fear and tormented with terrible visions of pain. Everywhere people are hurting one another, the planet is rampant with injustices, whole societies plunder groups of their own people, mothers imprison sons, children perish while brothers war. O, woe."
+
+**WHAT IS THE MATTER WITH THAT, IF IT IS WHAT YOU WANT TO DO?**
+
+"But nobody Wants it! Everybody hates it."
+
+**OH. WELL, THEN *STOP*.**
+
+At which moment She turned herself into an aspirin commercial and left The Polyfather stranded alone with his species.
+
+SINISTER DEXTER HAS A BROKEN SPIROMETER.
diff --git a/services/gemma/LICENSE b/services/gemma/LICENSE
new file mode 100644
index 000000000000..94a9ed024d38
--- /dev/null
+++ b/services/gemma/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/services/gemma/README.markdown b/services/gemma/README.markdown
new file mode 100644
index 000000000000..064742c0091f
--- /dev/null
+++ b/services/gemma/README.markdown
@@ -0,0 +1,96 @@
+# Gemma
+
+Gemma is a simple application to track *recurring* tasks, named after Gemma
+Hartley who [wrote an article][] about task distribution issues in households.
+
+## Background
+
+(Skip this if you just want the technical bits)
+
+Gemma's article launched a discussion in my friend circle about what causes an
+uneven distribution of household workload. I theorised that this is not so much
+a gender issue, but mostly a discoverability issue.
+
+Usually one person in a household is aware of what needs to be done, but in many
+cases the "overhead" of delegating the tasks would actually take more time than
+simply doing the task.
+
+I theorise further that the person (or people) who do a smaller share of the
+household work would often do the work if they had a convenient way to become
+aware of what needs to be done. Many times the "household manager" has the
+function of tracking non-obvious tasks like when bedsheets were last changed -
+shouldn't it be possible to actually distribute this information somehow?
+
+## The Project
+
+This project is an initial attempt at sketching out a little application that
+aids with reminding users of recurring tasks. Some basic ideas:
+
+* The system should be blame-free.
+* There should be as little usage overhead as possible so that people actually
+  do use it.
+* It should work mostly passively without much user interaction.
+
+I believe that the basic (*very* simple) idea behind Gemma solves these issues.
+Unfortunately my living situation changed before I actually got to test this out
+in a real-life situation involving multiple people, but feedback from other
+potential test subjects would be welcome! :)
+
+## Overview
+
+Gemma is a Common Lisp application in which a list of recurring tasks is
+declared, together with the *maximum interval* at which they should be completed
+(in days). Example:
+
+```lisp
+;; Bathroom tasks
+(deftask bathroom/wipe-mirror 7)
+(deftask bathroom/wipe-counter 7)
+
+;; Bedroom tasks
+(deftask bedroom/change-sheets 7)
+(deftask bedroom/vacuum 10)
+
+;; Kitchen tasks
+(deftask kitchen/trash 3)
+(deftask kitchen/wipe-counters 3)
+(deftask kitchen/vacuum 5 "Kitchen has more crumbs and such!")
+
+;; Entire place
+(deftask clean-windows 60)
+```
+
+These tasks are marked with their last completion time and tracked by Gemma. A
+simple Elm-based frontend application displays the tasks sorted by their
+"urgency" and features a button to mark a task as completed:
+
+![Gemma screenshot](http://i.imgur.com/n7FFMJH.png)
+
+Marking a task as completed resets its counter and moves it to the bottom of the
+task list.
+
+In theory this *should be it*, the frontend is made available to household
+members in some easily accessible place (e.g. an old phone glued to the fridge!)
+and people should attempt to develop a habit of checking what needs to be done
+occasionally.
+
+The "household manager" still exists as a role of the household because someone
+is entering the tasks into the application, but if my theory about people not
+actually being actively *unwilling* to do tasks is correct this could help a
+lot.
+
+## Usage
+
+(*Note*: Gemma is alpha software so the below is clearly not the final goal)
+
+Right now using this is non-trivial, but I'll eventually make a better
+distribution. Basically you need to know Common Lisp (in which case you'll know
+how to get the backend running) and have `elm-reactor` installed to run the
+development version of the frontend application.
+
+Gemma is configured via a configuration file that should be located either at
+`/etc/gemma/config.lisp` or at a custom location specified via the environment
+variable `GEMMA_CONFIG`. Have a look at the `config.lisp` file in the repository
+root for an example.
+
+[wrote an article]: http://www.harpersbazaar.com/culture/features/a12063822/emotional-labor-gender-equality/
diff --git a/services/gemma/build.lisp b/services/gemma/build.lisp
new file mode 100644
index 000000000000..e935ce25fde4
--- /dev/null
+++ b/services/gemma/build.lisp
@@ -0,0 +1,5 @@
+(require :asdf)
+(require :sb-posix)
+
+(push (format nil "~A/" (sb-posix:getcwd)) asdf:*central-registry*)
+(asdf:operate 'asdf:program-op :gemma)
diff --git a/services/gemma/config.lisp b/services/gemma/config.lisp
new file mode 100644
index 000000000000..54f8e5f34462
--- /dev/null
+++ b/services/gemma/config.lisp
@@ -0,0 +1,21 @@
+;; Example configuration file for Gemma
+
+(config :port 4242
+        :data-dir "/tmp/gemma/")
+
+(deftask bathroom/wipe-mirror 7)
+(deftask bathroom/wipe-counter 7)
+
+;; Bedroom tasks
+(deftask bedroom/change-sheets 7)
+(deftask bedroom/vacuum 10)
+
+;; Kitchen tasks
+(deftask kitchen/normal-trash 3)
+(deftask kitchen/green-trash 5)
+(deftask kitchen/blue-trash 5)
+(deftask kitchen/wipe-counters 3)
+(deftask kitchen/vacuum 5 "Kitchen has more crumbs and such!")
+
+;; Entire place
+(deftask clean-windows 60)
diff --git a/services/gemma/default.nix b/services/gemma/default.nix
new file mode 100644
index 000000000000..f48af489217a
--- /dev/null
+++ b/services/gemma/default.nix
@@ -0,0 +1,61 @@
+{ pkgs, ... }:
+
+let
+  inherit (pkgs) elmPackages lispPackages;
+  inherit (pkgs.third_party) stdenv sbcl makeWrapper openssl;
+
+  frontend = stdenv.mkDerivation {
+    name = "gemma-frontend";
+    src = ./frontend;
+    buildInputs = [ elmPackages.elm ];
+
+    phases = [ "unpackPhase" "buildPhase" ];
+    buildPhase = ''
+      mkdir .home && export HOME="$PWD/.home"
+      mkdir -p $out
+      elm-make --yes Main.elm --output $out/index.html
+    '';
+  };
+in stdenv.mkDerivation rec {
+  name = "gemma";
+  src = ./.;
+
+  nativeBuildInputs = with lispPackages; [
+    sbcl
+    hunchentoot
+    cl-json
+    cffi
+    cl-prevalence
+    local-time
+    makeWrapper
+  ];
+
+  buildPhase = ''
+    mkdir -p $out/share/gemma $out/bin
+
+    # Build Lisp using the Nix-provided wrapper which sets the load
+    # paths correctly.
+    cd $src
+    env GEMMA_BIN_TARGET=$out/bin/gemma common-lisp.sh --load build.lisp
+
+    # Wrap gemma to find OpenSSL at runtime:
+    wrapProgram $out/bin/gemma --prefix LD_LIBRARY_PATH : "${openssl.out}/lib"
+
+    # and finally copy the frontend to the appropriate spot
+    cp ${frontend}/index.html $out/share/gemma/index.html
+  '';
+
+  installPhase = "true";
+
+  # Stripping an SBCL executable removes the application, which is unfortunate.
+  dontStrip = true;
+
+  meta = with stdenv.lib; {
+    description = "Tool for tracking recurring tasks";
+    homepage    = "https://github.com/tazjin/gemma";
+    license     = licenses.gpl3;
+
+    # Lisp builds are broken for some reason (2019-09-22)
+    broken = true;
+  };
+}
diff --git a/services/gemma/frontend/Main.elm b/services/gemma/frontend/Main.elm
new file mode 100644
index 000000000000..e449908e499c
--- /dev/null
+++ b/services/gemma/frontend/Main.elm
@@ -0,0 +1,221 @@
+-- Copyright (C) 2016-2017  Vincent Ambo <mail@tazj.in>
+--
+-- This file is part of Gemma.
+--
+-- Gemma is free software: you can redistribute it and/or modify it
+-- under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+
+
+module Main exposing (..)
+
+import Html exposing (Html, text, div, span)
+import Html.Attributes exposing (style)
+import Json.Decode exposing (..)
+import Http
+import Time
+
+
+--  Material design imports
+
+import Material
+import Material.Card as Card
+import Material.Color as Color
+import Material.Grid exposing (grid, cell, size, Device(..))
+import Material.Layout as Layout
+import Material.Scheme as Scheme
+import Material.Options as Options
+import Material.Elevation as Elevation
+import Material.Button as Button
+
+
+-- API interface to Gemma
+
+
+type alias Task =
+    { name : String
+    , description : Maybe String
+    , remaining : Int
+    }
+
+
+emptyStringFilter s =
+    if s == "" then
+        Nothing
+    else
+        Just s
+
+
+decodeEmptyString : Decoder (Maybe String)
+decodeEmptyString =
+    map emptyStringFilter string
+
+
+decodeTask : Decoder Task
+decodeTask =
+    map3 Task
+        (field "name" string)
+        (field "description" decodeEmptyString)
+        (field "remaining" int)
+
+
+loadTasks : Cmd Msg
+loadTasks =
+    let
+        request =
+            Http.get "/tasks" (list decodeTask)
+    in
+        Http.send NewTasks request
+
+
+completeTask : Task -> Cmd Msg
+completeTask task =
+    let
+        request =
+            Http.getString
+                (String.concat
+                    [ "/complete?task="
+                    , task.name
+                    ]
+                )
+    in
+        Http.send (\_ -> LoadTasks) request
+
+
+
+-- Elm architecture implementation
+
+
+type Msg
+    = None
+    | LoadTasks
+    | NewTasks (Result Http.Error (List Task))
+    | Mdl (Material.Msg Msg)
+    | Complete Task
+
+
+type alias Model =
+    { tasks : List Task
+    , error : Maybe String
+    , mdl : Material.Model
+    }
+
+
+update : Msg -> Model -> ( Model, Cmd Msg )
+update msg model =
+    case msg of
+        LoadTasks ->
+            ( model, loadTasks )
+
+        Complete task ->
+            ( model, completeTask task )
+
+        NewTasks (Ok tasks) ->
+            ( { model | tasks = tasks, error = Nothing }, Cmd.none )
+
+        NewTasks (Err err) ->
+            ( { model | error = Just (toString err) }, Cmd.none )
+
+        _ ->
+            ( model, Cmd.none )
+
+
+
+-- View implementation
+
+
+white =
+    Color.text Color.white
+
+
+taskColor : Task -> Color.Hue
+taskColor task =
+    if task.remaining > 2 then
+        Color.Green
+    else if task.remaining < 0 then
+        Color.Red
+    else
+        Color.Yellow
+
+
+within : Task -> String
+within task =
+    if task.remaining < 0 then
+        "This task is overdue!"
+    else if task.remaining > 2 then
+        String.concat
+            [ "Relax, this task has "
+            , toString task.remaining
+            , " days left before it is due."
+            ]
+    else
+        String.concat
+            [ "This task should be completed within "
+            , toString task.remaining
+            , " days. Consider doing it now!"
+            ]
+
+
+renderTask : Model -> Task -> Html Msg
+renderTask model task =
+    Card.view
+        [ Color.background (Color.color (taskColor task) Color.S800)
+        , Elevation.e3
+        ]
+        [ Card.title [] [ Card.head [ white ] [ text task.name ] ]
+        , Card.text [ white ]
+            [ text (Maybe.withDefault "" task.description)
+            , Html.br [] []
+            , text (within task)
+            ]
+        , Card.actions
+            [ Card.border ]
+            [ Button.render Mdl
+                [ 0 ]
+                model.mdl
+                [ white, Button.ripple, Button.accent, Options.onClick (Complete task) ]
+                [ text "Completed" ]
+            ]
+        ]
+
+
+gemmaView : Model -> Html Msg
+gemmaView model =
+    grid []
+        (List.map (\t -> cell [ size All 4 ] [ renderTask model t ])
+            model.tasks
+        )
+
+
+view : Model -> Html Msg
+view model =
+    gemmaView model |> Scheme.top
+
+
+
+-- subscriptions : Model -> Sub Msg
+
+
+subscriptions model =
+    Sub.batch
+        [ Material.subscriptions Mdl model
+        , Time.every (15 * Time.second) (\_ -> LoadTasks)
+        ]
+
+
+main : Program Never Model Msg
+main =
+    let
+        model =
+            { tasks = []
+            , error = Nothing
+            , mdl = Material.model
+            }
+    in
+        Html.program
+            { init = ( model, Cmd.batch [ loadTasks, Material.init Mdl ] )
+            , view = view
+            , update = update
+            , subscriptions = subscriptions
+            }
diff --git a/services/gemma/frontend/elm-package.json b/services/gemma/frontend/elm-package.json
new file mode 100644
index 000000000000..2ae541ae0b95
--- /dev/null
+++ b/services/gemma/frontend/elm-package.json
@@ -0,0 +1,17 @@
+{
+    "version": "1.0.0",
+    "summary": "helpful summary of your project, less than 80 characters",
+    "repository": "https://github.com/user/project.git",
+    "license": "BSD3",
+    "source-directories": [
+        "."
+    ],
+    "exposed-modules": [],
+    "dependencies": {
+        "elm-lang/core": "5.1.1 <= v < 6.0.0",
+        "elm-lang/html": "2.0.0 <= v < 3.0.0",
+        "elm-lang/http": "1.0.0 <= v < 2.0.0",
+        "debois/elm-mdl": "8.1.0 <= v < 9.0.0"
+    },
+    "elm-version": "0.18.0 <= v < 0.19.0"
+}
diff --git a/services/gemma/gemma.asd b/services/gemma/gemma.asd
new file mode 100644
index 000000000000..0aea9c95ff92
--- /dev/null
+++ b/services/gemma/gemma.asd
@@ -0,0 +1,33 @@
+#|
+  This file is part of Gemma.
+
+  Gemma is free software: you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Copyright (c) 2017 Vincent Ambo
+|#
+
+(require 'sb-posix)
+
+(defsystem "gemma"
+  :version "0.1.0"
+  :author "Vincent Ambo"
+  :license "GPLv3"
+  :depends-on (local-time
+               hunchentoot
+               cl-json
+               cl-prevalence)
+  :components ((:module "src"
+                :components
+                ((:file "gemma"))))
+  :build-operation program-op
+  :build-pathname #.(or (pathname  (sb-posix:getenv "GEMMA_BIN_TARGET"))
+                        "gemma")
+  :entry-point "gemma::entrypoint"
+  :description "Gemma is a household task management system"
+  :long-description
+  #.(read-file-string
+     (subpathname *load-pathname* "README.markdown"))
+  :in-order-to ((test-op (test-op "gemma-test"))))
diff --git a/services/gemma/src/gemma.lisp b/services/gemma/src/gemma.lisp
new file mode 100644
index 000000000000..b8a20addd907
--- /dev/null
+++ b/services/gemma/src/gemma.lisp
@@ -0,0 +1,192 @@
+;; Copyright (C) 2016-2017  Vincent Ambo <mail@tazj.in>
+;;
+;; This file is part of Gemma.
+;;
+;; Gemma is free software: you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+(defpackage gemma
+  (:use :cl
+        :local-time
+        :cl-json)
+  (:import-from :sb-posix :getenv)
+  (:shadowing-import-from :sb-posix :getcwd)
+  (:export :start-gemma :config :entrypoint))
+(in-package :gemma)
+
+;; TODO: Store an average of how many days it was between task
+;; completions. Some of the current numbers are just guesses
+;; anyways.
+
+(defmacro in-case-of (x &body body)
+  "Evaluate BODY if X is non-nil, binding the value of X to IT."
+  `(let ((it ,x))
+     (when it ,@body)))
+
+;; Set default configuration parameters
+(defvar *gemma-port* 4242
+  "Port on which the Gemma web server listens.")
+
+(defvar *static-file-location*
+  (or (in-case-of (sb-posix:getenv "out")
+        (concatenate 'string it "/share/gemma/"))
+      "frontend/")
+  "Folder from which to serve static assets. If built inside of Nix,
+  the folder is concatenated with the output path at which the files
+  are expected to be.")
+
+(defun initialise-persistence (data-dir)
+  (defvar *p-tasks*
+    (cl-prevalence:make-prevalence-system data-dir)
+    "All tasks registered in this Gemma instance.")
+
+  ;; Initialise database ID counter
+  (or (> (length (cl-prevalence:find-all-objects *p-tasks* 'task)) 0)
+      (cl-prevalence:tx-create-id-counter *p-tasks*)))
+
+(defun config (&key port data-dir)
+  "Configuration function for use in the Gemma configuration file."
+
+  (in-package :gemma)
+  (in-case-of port (defparameter *gemma-port* it))
+  (initialise-persistence (or data-dir "data/")))
+
+;;
+;; Define task management system
+;;
+
+(defclass task ()
+  ((id :reader id
+       :initarg :id)
+
+   ;; (Unique) name of the task
+   (name :type symbol
+         :initarg :name
+         :accessor name-of)
+
+   ;; Maximum completion interval
+   (days :type integer
+         :initarg :days
+         :accessor days-of)
+
+   ;; Optional description
+   (description :type string
+                :initarg :description
+                :accessor description-of)
+
+   ;; Last completion time
+   (done-at :type timestamp
+            :initarg :done-at
+            :accessor last-done-at)))
+
+(defmacro deftask (task-name days &optional description)
+  (unless (get-task task-name)
+    `(progn (cl-prevalence:tx-create-object
+             *p-tasks*
+             'task
+             (quote ((name ,task-name)
+                     (days ,days)
+                     (description ,(or description ""))
+                     (done-at ,(now)))))
+            (cl-prevalence:snapshot *p-tasks*))))
+
+(defun get-task (name)
+  (cl-prevalence:find-object-with-slot *p-tasks* 'task 'name name))
+
+(defun list-tasks ()
+  (cl-prevalence:find-all-objects *p-tasks* 'task))
+
+(defun days-remaining (task)
+  "Returns the number of days remaining before the supplied TASK reaches its
+maximum interval."
+  (let* ((expires-at (timestamp+ (last-done-at task)
+                                 (days-of task) :day))
+         (secs-until-expiry (timestamp-difference expires-at (now))))
+    (round (/ secs-until-expiry 60 60 24))))
+
+(defun sort-tasks (tasks)
+  "Sorts TASKS in descending order by number of days remaining."
+  (sort (copy-list tasks)
+        (lambda (t1 t2) (< (days-remaining t1)
+                           (days-remaining t2)))))
+
+(defun complete-task (name &optional at)
+  "Mark the task with NAME as completed, either now or AT specified time."
+  (cl-prevalence:tx-change-object-slots *p-tasks* 'task
+                                        (id (get-task name))
+                                        `((done-at ,(or at (now)))))
+  (cl-prevalence:snapshot *p-tasks*))
+
+;;
+;; Define web API
+;;
+
+(defun response-for (task)
+  "Create a response object to be JSON encoded for TASK."
+  `((:name . ,(name-of task))
+    (:description . ,(description-of task))
+    (:remaining . ,(days-remaining task))))
+
+(defun start-gemma ()
+  (in-package :gemma)
+
+  ;; Load configuration
+  (load (pathname (or (getenv "GEMMA_CONFIG")
+                      "/etc/gemma/config.lisp")))
+
+  ;; Set up web server
+  (hunchentoot:start
+   (make-instance 'hunchentoot:easy-acceptor
+                  :port *gemma-port*
+                  :document-root *static-file-location*))
+
+  ;; Task listing handler
+  (hunchentoot:define-easy-handler
+   (get-tasks :uri "/tasks") ()
+
+   (setf (hunchentoot:content-type*) "application/json")
+   (setf (hunchentoot:header-out "Access-Control-Allow-Origin") "*")
+   (encode-json-to-string
+    ;; Construct a frontend-friendly representation of the tasks.
+    (mapcar #'response-for (sort-tasks (list-tasks)))))
+
+  ;; Task completion handler
+  (hunchentoot:define-easy-handler
+   (complete-task-handler :uri "/complete") (task)
+   (setf (hunchentoot:content-type*) "application/json")
+   (let* ((key (find-symbol (camel-case-to-lisp task) "GEMMA")))
+     (format t "Marking task ~A as completed" key)
+     (complete-task key)
+     (encode-json-to-string (response-for (get-task key))))))
+
+(defun entrypoint ()
+  "This function serves as the entrypoint for ASDF-built executables.
+  It joins the Hunchentoot server thread to keep the process running
+  for as long as the server is alive."
+
+  (start-gemma)
+  (sb-thread:join-thread
+   (find-if (lambda (th)
+              (string= (sb-thread:thread-name th)
+                       (format nil "hunchentoot-listener-*:~A" *gemma-port*)))
+            (sb-thread:list-all-threads))))
+
+;; Experimentation / testing stuff
+
+(defun randomise-completion-times ()
+  "Set some random completion timestamps for all tasks"
+  (mapcar
+   (lambda (task)
+     (complete-task (name-of task)
+                    (timestamp- (now)
+                                (random 14)
+                                :day)))
+   (cl-prevalence:find-all-objects *p-tasks* 'task)))
+
+(defun clear-all-tasks ()
+  (mapcar (lambda (task) (cl-prevalence:tx-delete-object *p-tasks* 'task (id task)))
+          (cl-prevalence:find-all-objects *p-tasks* 'task)))
+
+;; (randomise-completion-times)
diff --git a/services/nixcon-demo/Cargo.lock b/services/nixcon-demo/Cargo.lock
new file mode 100644
index 000000000000..4339d733b5d1
--- /dev/null
+++ b/services/nixcon-demo/Cargo.lock
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diff --git a/services/nixcon-demo/Cargo.toml b/services/nixcon-demo/Cargo.toml
new file mode 100644
index 000000000000..06f484021feb
--- /dev/null
+++ b/services/nixcon-demo/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "nixcon-demo"
+version = "0.1.0"
+authors = ["Vincent Ambo <tazjin@google.com>"]
+edition = "2018"
+
+[dependencies]
+rouille = "3.0"
diff --git a/services/nixcon-demo/default.nix b/services/nixcon-demo/default.nix
new file mode 100644
index 000000000000..0f4a330f7f74
--- /dev/null
+++ b/services/nixcon-demo/default.nix
@@ -0,0 +1,3 @@
+{ pkgs, ... }:
+
+pkgs.third_party.naersk.buildPackage ./. {}
diff --git a/services/nixcon-demo/src/main.rs b/services/nixcon-demo/src/main.rs
new file mode 100644
index 000000000000..226fe49ed1a3
--- /dev/null
+++ b/services/nixcon-demo/src/main.rs
@@ -0,0 +1,19 @@
+use rouille::Response;
+use std::env;
+use std::io;
+use std::process;
+
+const GREETING: &str = "Halรณ NixCon!";
+
+fn main() {
+    if let Some(arg) = env::args().last() {
+        if arg == "--cli" {
+            println!("{}", GREETING);
+            process::exit(0);
+        }
+    }
+
+    rouille::start_server("0.0.0.0:8080", move |req| {
+        rouille::log(req, io::stdout(), || Response::text(GREETING))
+    })
+}
diff --git a/services/tazblog/blog/Main.hs b/services/tazblog/blog/Main.hs
new file mode 100644
index 000000000000..6074f96b7685
--- /dev/null
+++ b/services/tazblog/blog/Main.hs
@@ -0,0 +1,24 @@
+-- | Main module for the blog's web server
+module Main where
+
+import Control.Applicative ((<$>), (<*>))
+import Server (runBlog)
+import System.Environment (getEnv)
+
+data MainOptions
+  = MainOptions
+      { blogPort :: Int,
+        resourceDir :: String
+        }
+
+readOpts :: IO MainOptions
+readOpts =
+  MainOptions
+    <$> (fmap read $ getEnv "PORT")
+    <*> getEnv "RESOURCE_DIR"
+
+main :: IO ()
+main = do
+  opts <- readOpts
+  putStrLn ("tazblog starting on port " ++ (show $ blogPort opts))
+  runBlog (blogPort opts) (resourceDir opts)
diff --git a/services/tazblog/default.nix b/services/tazblog/default.nix
new file mode 100644
index 000000000000..eecadff6ba17
--- /dev/null
+++ b/services/tazblog/default.nix
@@ -0,0 +1,18 @@
+# Build configuration for the blog using plain Nix.
+#
+# tazblog.nix was generated using cabal2nix.
+
+{ pkgs, ... }:
+
+let
+  inherit (pkgs.third_party) writeShellScriptBin haskell;
+  tazblog = haskell.packages.ghc865.callPackage ./tazblog.nix {};
+  wrapper =  writeShellScriptBin "tazblog" ''
+    export PORT=8000
+    export RESOURCE_DIR=${./static}
+    exec ${tazblog}/bin/tazblog
+  '';
+in wrapper.overrideAttrs(_: {
+  allowSubstitutes = true;
+  meta.enableCI = true;
+})
diff --git a/services/tazblog/shell.nix b/services/tazblog/shell.nix
new file mode 100644
index 000000000000..ebb891a87458
--- /dev/null
+++ b/services/tazblog/shell.nix
@@ -0,0 +1,11 @@
+{ pkgs ? (import ../../default.nix {}).third_party.nixpkgs }:
+
+let tazblog = import ./tazblog.nix;
+    depNames = with builtins; filter (
+      p: hasAttr p pkgs.haskellPackages
+    ) (attrNames (functionArgs tazblog));
+    ghc = pkgs.ghc.withPackages(p: map (x: p."${x}") depNames);
+in pkgs.stdenv.mkDerivation {
+  name = "shell";
+  buildInputs = [ ghc pkgs.hlint ];
+}
diff --git a/services/tazblog/src/Blog.hs b/services/tazblog/src/Blog.hs
new file mode 100644
index 000000000000..0a53b5f2fbf4
--- /dev/null
+++ b/services/tazblog/src/Blog.hs
@@ -0,0 +1,141 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module Blog where
+
+import BlogStore
+import Data.Text (Text, pack)
+import qualified Data.Text as T
+import Data.Text.Lazy (fromStrict)
+import Data.Time
+import Text.Blaze.Html (preEscapedToHtml)
+import Text.Hamlet
+import Text.Markdown
+
+blogTitle :: Text = "tazjin's blog"
+
+repoURL :: Text = "https://bitbucket.org/tazjin/tazblog-haskell"
+
+mailTo :: Text = "mailto:mail@tazj.in"
+
+twitter :: Text = "https://twitter.com/tazjin"
+
+replace :: Eq a => a -> a -> [a] -> [a]
+replace x y = map (\z -> if z == x then y else z)
+
+-- |After this date all entries are Markdown
+markdownCutoff :: Day
+markdownCutoff = fromGregorian 2013 04 28
+
+blogTemplate :: Text -> Html -> Html
+blogTemplate t_append body =
+  [shamlet|
+$doctype 5
+  <head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="description" content=#{blogTitle}#{t_append}>
+    <link rel="stylesheet" type="text/css" href="/static/blog.css" media="all">
+    <link rel="alternate" type="application/rss+xml" title="RSS-Feed" href="/rss.xml">
+    <title>#{blogTitle}#{t_append}
+  <body>
+    <header>
+      <h1>
+        <a href="/" .unstyled-link>#{blogTitle}
+      <hr>
+    ^{body}
+    ^{showFooter}
+|]
+
+showFooter :: Html
+showFooter =
+  [shamlet|
+<footer>
+  <p .footer>Served without any dynamic languages.
+  <p .footer>
+    <a href=#{repoURL} .uncoloured-link>
+    |
+    <a href=#{twitter} .uncoloured-link>Twitter
+    |
+    <a href=#{mailTo} .uncoloured-link>Mail
+  <p .lod>
+    เฒ _เฒ 
+|]
+
+isEntryMarkdown :: Entry -> Bool
+isEntryMarkdown e = edate e > markdownCutoff
+
+renderEntryMarkdown :: Text -> Html
+renderEntryMarkdown = markdown def {msXssProtect = False} . fromStrict
+
+renderEntries :: [Entry] -> Maybe Html -> Html
+renderEntries entries pageLinks =
+  [shamlet|
+$forall entry <- entries
+  <article>
+    <h2 .inline>
+      <a href=#{linkElems entry} .unstyled-link>
+        #{title entry}
+    <aside .date>
+      #{pack $ formatTime defaultTimeLocale "%Y-%m-%d" $ edate entry}
+    $if (isEntryMarkdown entry)
+      ^{renderEntryMarkdown $ text entry}
+    $else
+      ^{preEscapedToHtml $ text entry}
+  <hr>
+$maybe links <- pageLinks
+  ^{links}
+|]
+  where
+    linkElems Entry {..} = "/" ++ show entryId
+
+showLinks :: Maybe Int -> Html
+showLinks (Just i) =
+  [shamlet|
+  $if ((>) i 1)
+    <div .navigation>
+      <a href=#{nLink $ succ i} .uncoloured-link>Earlier
+      |
+      <a href=#{nLink $ pred i} .uncoloured-link>Later
+  $elseif ((<=) i 1)
+    ^{showLinks Nothing}
+|]
+  where
+    nLink page = T.concat ["/?page=", show' page]
+showLinks Nothing =
+  [shamlet|
+<div .navigation>
+  <a href="/?page=2" .uncoloured-link>Earlier
+|]
+
+renderEntry :: Entry -> Html
+renderEntry e@Entry {..} =
+  [shamlet|
+<article>
+  <h2 .inline>
+    #{title}
+  <aside .date>
+    #{pack $ formatTime defaultTimeLocale "%Y-%m-%d" edate}
+  $if (isEntryMarkdown e)
+    ^{renderEntryMarkdown text}
+  $else
+    ^{preEscapedToHtml $ text}
+<hr>
+|]
+
+showError :: Text -> Text -> Html
+showError title err =
+  blogTemplate (": " <> title)
+    [shamlet|
+<p>:(
+<p>#{err}
+<hr>
+|]
diff --git a/services/tazblog/src/BlogStore.hs b/services/tazblog/src/BlogStore.hs
new file mode 100644
index 000000000000..60ccd0b5a003
--- /dev/null
+++ b/services/tazblog/src/BlogStore.hs
@@ -0,0 +1,182 @@
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+-- |This module implements fetching of individual blog entries from
+-- DNS. Yes, you read that correctly.
+--
+-- Each blog post is stored as a set of records in a designated DNS
+-- zone. For the production blog, this zone is `blog.tazj.in.`.
+--
+-- A top-level record at `_posts` contains a list of all published
+-- post IDs.
+--
+-- For each of these post IDs, there is a record at `_meta.$postID`
+-- that contains the title and number of post chunks.
+--
+-- For each post chunk, there is a record at `_$chunkID.$postID` that
+-- contains a base64-encoded post fragment.
+--
+-- This module implements logic for assembling a post out of these
+-- fragments and caching it based on the TTL of its `_meta` record.
+module BlogStore
+  ( BlogCache,
+    EntryId (..),
+    Entry (..),
+    withCache,
+    listEntries,
+    getEntry,
+    show'
+    )
+where
+
+import Control.Applicative ((<$>), (<*>))
+import Control.Monad (mzero)
+import Control.Monad.IO.Class (MonadIO, liftIO)
+import Data.Aeson ((.:), FromJSON (..), Value (Object), decodeStrict)
+import Data.ByteString.Base64 (decodeLenient)
+import Data.Either (fromRight)
+import Data.List (sortBy)
+import Data.Text as T (Text, concat, pack)
+import Data.Text.Encoding (decodeUtf8', encodeUtf8)
+import Data.Time (Day)
+import Network.DNS (DNSError, lookupTXT)
+import qualified Network.DNS.Resolver as R
+
+newtype EntryId = EntryId {unEntryId :: Integer}
+  deriving (Eq, Ord, FromJSON)
+
+instance Show EntryId where
+
+  show = show . unEntryId
+
+data Entry
+  = Entry
+      { entryId :: EntryId,
+        author :: Text,
+        title :: Text,
+        text :: Text,
+        edate :: Day
+        }
+  deriving (Eq, Ord, Show)
+
+-- | Wraps a DNS resolver with caching configured. For the initial
+-- version of this, all caching of entries is done by the resolver
+-- (i.e. no pre-assembled versions of entries are cached).
+data BlogCache = BlogCache R.Resolver Text
+
+data StoreError
+  = PostNotFound EntryId
+  | DNS DNSError
+  | InvalidMetadata
+  | InvalidChunk
+  | InvalidPosts
+  deriving (Show)
+
+type Offset = Int
+
+type Count = Int
+
+withCache :: Text -> (BlogCache -> IO a) -> IO a
+withCache zone f = do
+  let conf =
+        R.defaultResolvConf
+          { R.resolvCache = Just R.defaultCacheConf,
+            R.resolvConcurrent = True
+            }
+  seed <- R.makeResolvSeed conf
+  R.withResolver seed (\r -> f $ BlogCache r zone)
+
+listEntries :: MonadIO m => BlogCache -> Offset -> Count -> m [Entry]
+listEntries cache offset count = liftIO $ do
+  posts <- postList cache
+  entries <- mapM (entryFromDNS cache) $ take count $ drop offset $ fromRight (error "no posts") posts
+  -- TODO: maybe don't just drop broken entries
+  return
+    $ fromRight (error "no entries")
+    $ sequence entries
+
+getEntry :: MonadIO m => BlogCache -> EntryId -> m (Maybe Entry)
+getEntry cache eid = liftIO $ entryFromDNS cache eid >>= \case
+  Left _ -> return Nothing -- TODO: ??
+  Right entry -> return $ Just entry
+
+show' :: Show a => a -> Text
+show' = pack . show
+
+-- * DNS fetching implementation
+type Chunk = Integer
+
+-- | Represents the metadata stored for each post in the _meta record.
+data Meta = Meta Integer Text Day
+  deriving (Show)
+
+instance FromJSON Meta where
+
+  parseJSON (Object v) =
+    Meta
+      <$> v
+      .: "c"
+      <*> v
+      .: "t"
+      <*> v
+      .: "d"
+  parseJSON _ = mzero
+
+entryMetadata :: BlogCache -> EntryId -> IO (Either StoreError Meta)
+entryMetadata (BlogCache r z) (EntryId eid) =
+  let domain = encodeUtf8 ("_meta." <> show' eid <> "." <> z)
+      record = lookupTXT r domain
+      toMeta rrdata = case decodeStrict $ decodeLenient rrdata of
+        Nothing -> Left InvalidMetadata
+        Just m -> Right m
+   in record >>= \case
+        (Left err) -> return $ Left $ DNS err
+        (Right [bs]) -> return $ toMeta bs
+        _ -> return $ Left InvalidMetadata
+
+entryChunk :: BlogCache -> EntryId -> Chunk -> IO (Either StoreError Text)
+entryChunk (BlogCache r z) (EntryId eid) c =
+  let domain = encodeUtf8 ("_" <> show' c <> "." <> show' eid <> "." <> z)
+      record = lookupTXT r domain
+      toChunk rrdata = case decodeUtf8' $ decodeLenient rrdata of
+        Left _ -> Left InvalidChunk
+        Right chunk -> Right chunk
+   in record >>= \case
+        (Left err) -> return $ Left $ DNS err
+        (Right [bs]) -> return $ toChunk bs
+        _ -> return $ Left InvalidChunk
+
+fetchAssembleChunks :: BlogCache -> EntryId -> Meta -> IO (Either StoreError Text)
+fetchAssembleChunks cache eid (Meta n _ _) = do
+  chunks <- mapM (entryChunk cache eid) [0 .. (n - 1)]
+  return $ fmap T.concat $ sequence chunks
+
+entryFromDNS :: BlogCache -> EntryId -> IO (Either StoreError Entry)
+entryFromDNS cache eid = do
+  meta <- entryMetadata cache eid
+  case meta of
+    Left err -> return $ Left err
+    Right meta -> do
+      chunks <- fetchAssembleChunks cache eid meta
+      let (Meta _ t d) = meta
+      return
+        $ either Left
+            ( \text -> Right $ Entry
+                { entryId = eid,
+                  author = "tazjin",
+                  title = t,
+                  text = text,
+                  edate = d
+                  }
+              )
+            chunks
+
+postList :: BlogCache -> IO (Either StoreError [EntryId])
+postList (BlogCache r z) =
+  let domain = encodeUtf8 ("_posts." <> z)
+      record = lookupTXT r domain
+      toPosts =
+        fmap (sortBy (flip compare))
+          . mapM (maybe (Left InvalidPosts) Right . decodeStrict)
+   in either (Left . DNS) toPosts <$> record
diff --git a/services/tazblog/src/RSS.hs b/services/tazblog/src/RSS.hs
new file mode 100644
index 000000000000..913aa9a4081b
--- /dev/null
+++ b/services/tazblog/src/RSS.hs
@@ -0,0 +1,48 @@
+{-# LANGUAGE RecordWildCards #-}
+
+module RSS
+  ( renderFeed
+    )
+where
+
+import BlogStore
+import Data.Maybe (fromJust)
+import qualified Data.Text as T
+import Data.Time (UTCTime (..), getCurrentTime, secondsToDiffTime)
+import Network.URI (URI, parseURI)
+import Text.RSS
+
+createChannel :: UTCTime -> [ChannelElem]
+createChannel now =
+  [ Language "en",
+    Copyright "Vincent Ambo",
+    WebMaster "mail@tazj.in",
+    ChannelPubDate now
+    ]
+
+createRSS :: UTCTime -> [Item] -> RSS
+createRSS t =
+  let link = fromJust $ parseURI "https://tazj.in"
+   in RSS "tazjin's blog" link "tazjin's blog feed" (createChannel t)
+
+createItem :: Entry -> Item
+createItem Entry {..} =
+  [ Title "tazjin's blog",
+    Link $ entryLink entryId,
+    Description $ T.unpack text,
+    PubDate $ UTCTime edate $ secondsToDiffTime 0
+    ]
+
+entryLink :: EntryId -> URI
+entryLink i =
+  let url = "http://tazj.in/" ++ "/" ++ show i
+   in fromJust $ parseURI url
+
+createItems :: [Entry] -> [Item]
+createItems = map createItem
+
+createFeed :: [Entry] -> IO RSS
+createFeed e = getCurrentTime >>= (\t -> return $ createRSS t $ createItems e)
+
+renderFeed :: [Entry] -> IO String
+renderFeed e = fmap (showXML . rssToXML) (createFeed e)
diff --git a/services/tazblog/src/Server.hs b/services/tazblog/src/Server.hs
new file mode 100644
index 000000000000..40129988393b
--- /dev/null
+++ b/services/tazblog/src/Server.hs
@@ -0,0 +1,81 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Server where
+
+import Blog
+import BlogStore
+import Control.Applicative (optional)
+import Control.Monad (msum)
+import Control.Monad.IO.Class (liftIO)
+import Data.Maybe (maybe)
+import qualified Data.Text as T
+import Happstack.Server hiding (Session)
+import RSS
+
+pageSize :: Int
+pageSize = 3
+
+tmpPolicy :: BodyPolicy
+tmpPolicy = defaultBodyPolicy "/tmp" 0 200000 1000
+
+runBlog :: Int -> String -> IO ()
+runBlog port respath =
+  withCache "blog.tazj.in." $ \cache ->
+    simpleHTTP nullConf {port = port} $ tazblog cache respath
+
+tazblog :: BlogCache -> String -> ServerPart Response
+tazblog cache resDir =
+  msum
+    [ -- legacy language-specific routes
+      dir "de" $ blogHandler cache,
+      dir "en" $ blogHandler cache,
+      dir "static" $ staticHandler resDir,
+      blogHandler cache,
+      staticHandler resDir,
+      notFound $ toResponse $ showError "Not found" "Page not found"
+      ]
+
+blogHandler :: BlogCache -> ServerPart Response
+blogHandler cache =
+  msum
+    [ path $ \(eId :: Integer) -> showEntry cache $ EntryId eId,
+      nullDir >> showIndex cache,
+      dir "rss" $ nullDir >> showRSS cache,
+      dir "rss.xml" $ nullDir >> showRSS cache
+      ]
+
+staticHandler :: String -> ServerPart Response
+staticHandler resDir = do
+  setHeaderM "cache-control" "max-age=630720000"
+  setHeaderM "expires" "Tue, 20 Jan 2037 04:20:42 GMT"
+  serveDirectory DisableBrowsing [] resDir
+
+showEntry :: BlogCache -> EntryId -> ServerPart Response
+showEntry cache eId = do
+  entry <- getEntry cache eId
+  tryEntry entry
+
+tryEntry :: Maybe Entry -> ServerPart Response
+tryEntry Nothing = notFound $ toResponse $ showError "Not found" "Blog entry not found"
+tryEntry (Just entry) = ok $ toResponse $ blogTemplate eTitle $ renderEntry entry
+  where
+    eTitle = T.append ": " (title entry)
+
+offset :: Maybe Int -> Int
+offset = maybe 0 (pageSize *)
+
+showIndex :: BlogCache -> ServerPart Response
+showIndex cache = do
+  (page :: Maybe Int) <- optional $ lookRead "page"
+  entries <- listEntries cache (offset page) pageSize
+  ok $ toResponse $ blogTemplate ""
+    $ renderEntries entries (Just $ showLinks page)
+
+showRSS :: BlogCache -> ServerPart Response
+showRSS cache = do
+  entries <- listEntries cache 0 4
+  feed <- liftIO $ renderFeed entries
+  setHeaderM "content-type" "text/xml"
+  ok $ toResponse feed
diff --git a/services/tazblog/static/apple-touch-icon.png b/services/tazblog/static/apple-touch-icon.png
new file mode 100644
index 000000000000..22ba058cddd4
--- /dev/null
+++ b/services/tazblog/static/apple-touch-icon.png
Binary files differdiff --git a/services/tazblog/static/blog.css b/services/tazblog/static/blog.css
new file mode 100644
index 000000000000..e6e4ae3c2be0
--- /dev/null
+++ b/services/tazblog/static/blog.css
@@ -0,0 +1,35 @@
+body {
+    margin: 40px auto;
+    max-width: 650px;
+    line-height: 1.6;
+    font-size: 18px;
+    color: #383838;
+    padding: 0 10px
+}
+h1, h2, h3 {
+    line-height: 1.2
+}
+.footer {
+    text-align: right;
+}
+.lod {
+    text-align: center;
+}
+.unstyled-link {
+    color: inherit;
+    text-decoration: none;
+}
+.uncoloured-link {
+    color: inherit;
+}
+.date {
+    text-align: right;
+    font-style: italic;
+    float: right;
+}
+.inline {
+    display: inline;
+}
+.navigation {
+    text-align: center;
+}
diff --git a/services/tazblog/static/favicon.ico b/services/tazblog/static/favicon.ico
new file mode 100644
index 000000000000..2958dd3afcb0
--- /dev/null
+++ b/services/tazblog/static/favicon.ico
Binary files differdiff --git a/services/tazblog/static/keybase.txt b/services/tazblog/static/keybase.txt
new file mode 100644
index 000000000000..661c33e01e73
--- /dev/null
+++ b/services/tazblog/static/keybase.txt
@@ -0,0 +1,69 @@
+==================================================================
+https://keybase.io/tazjin
+--------------------------------------------------------------------
+
+I hereby claim:
+
+  * I am an admin of http://tazj.in
+  * I am tazjin (https://keybase.io/tazjin) on keybase.
+  * I have a public key with fingerprint DCF3 4CFA C1AC 44B8 7E26  3331 36EE 3481 4F6D 294A
+
+To claim this, I am signing this object:
+
+{
+    "body": {
+        "key": {
+            "fingerprint": "dcf34cfac1ac44b87e26333136ee34814f6d294a",
+            "host": "keybase.io",
+            "key_id": "36EE34814F6D294A",
+            "uid": "2268b75a56bb9693d3ef077bc1217900",
+            "username": "tazjin"
+        },
+        "service": {
+            "hostname": "tazj.in",
+            "protocol": "http:"
+        },
+        "type": "web_service_binding",
+        "version": 1
+    },
+    "ctime": 1397644545,
+    "expire_in": 157680000,
+    "prev": "4973fdda56a6cfa726a813411c915458c652be45dd19283f7a4ae4f9c217df14",
+    "seqno": 4,
+    "tag": "signature"
+}
+
+with the aforementioned key, yielding the PGP signature:
+
+-----BEGIN PGP MESSAGE-----
+Version: GnuPG v2.0.22 (GNU/Linux)
+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+=xHfH
+-----END PGP MESSAGE-----
+
+And finally, I am proving ownership of this host by posting or
+appending to this document.
+
+View my publicly-auditable identity here: https://keybase.io/tazjin
+
+==================================================================
diff --git a/services/tazblog/tazblog.cabal b/services/tazblog/tazblog.cabal
new file mode 100644
index 000000000000..58aeb7049ed1
--- /dev/null
+++ b/services/tazblog/tazblog.cabal
@@ -0,0 +1,39 @@
+Name:                tazblog
+Version:             6.0.0
+Synopsis:            Tazjin's Blog
+License:             MIT
+Author:              Vincent Ambo
+Maintainer:          mail@tazj.in
+Category:            Web blog
+Build-type:          Simple
+cabal-version:       >= 1.10
+
+library
+  hs-source-dirs: src
+  default-language: Haskell2010
+  ghc-options: -W
+  exposed-modules: Blog, BlogStore, Server, RSS
+  build-depends: aeson,
+                 base,
+                 bytestring,
+                 happstack-server,
+                 text,
+                 blaze-html,
+                 dns,
+                 old-locale,
+                 time,
+                 base64-bytestring,
+                 network,
+                 network-uri,
+                 rss,
+                 shakespeare,
+                 markdown
+
+executable tazblog
+  hs-source-dirs: blog
+  main-is: Main.hs
+  default-language:    Haskell2010
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends: base,
+                 tazblog,
+                 network
diff --git a/services/tazblog/tazblog.nix b/services/tazblog/tazblog.nix
new file mode 100644
index 000000000000..b59cddec07a7
--- /dev/null
+++ b/services/tazblog/tazblog.nix
@@ -0,0 +1,30 @@
+{ mkDerivation, aeson, base, base64-bytestring, blaze-html , bytestring, dns
+, happstack-server, markdown, network, network-uri, old-locale, rss
+, shakespeare, stdenv, text, time }:
+mkDerivation {
+  pname = "tazblog";
+  version = "6.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson
+    base
+    base64-bytestring
+    blaze-html
+    bytestring
+    dns
+    happstack-server
+    markdown
+    network
+    network-uri
+    old-locale
+    rss
+    shakespeare
+    text
+    time
+  ];
+  executableHaskellDepends = [ base network ];
+  description = "Tazjin's Blog";
+  license = stdenv.lib.licenses.mit;
+}
diff --git a/third_party/README.md b/third_party/README.md
new file mode 100644
index 000000000000..267f23469775
--- /dev/null
+++ b/third_party/README.md
@@ -0,0 +1,13 @@
+Third-Party Code
+================
+
+Code under this folder is one of the following:
+
+1. Externally developed dependencies which have been imported ("vendored") into
+   this repository. These dependencies come with their own licenses and whatever
+   else.
+
+2. Code that is developed inside of this repository, but released to an external
+   repository via [Copybara][].
+
+[Copybara]: https://github.com/google/copybara
diff --git a/third_party/default.nix b/third_party/default.nix
new file mode 100644
index 000000000000..230f2a7bc1ac
--- /dev/null
+++ b/third_party/default.nix
@@ -0,0 +1,75 @@
+# This file controls the import of external dependencies (i.e.
+# third-party code) into my package tree.
+#
+# This includes *all packages needed from nixpkgs*.
+
+{ pkgs, ... }:
+let
+  # The pinned commit here is identical to the public nixery.dev
+  # version, since popularity data has been generated for that.
+  stableCommit = "3140fa89c51233397f496f49014f6b23216667c2";
+  stableSrc = fetchTarball {
+    url = "https://github.com/NixOS/nixpkgs-channels/archive/${stableCommit}.tar.gz";
+    sha256 = "18p0d5lnfvzsyfah02mf6bi249990pfwnylwhqdh8qi70ncrk3f8";
+  };
+  nixpkgs = import stableSrc {
+    config.allowUnfree = true;
+    config.allowBroken = true;
+  };
+
+  exposed = {
+    # Inherit the packages from nixpkgs that should be available inside
+    # of the repo. They become available under `pkgs.third_party.<name>`
+    inherit (nixpkgs)
+      bashInteractive
+      buildGoPackage
+      cacert
+      cachix
+      cargo
+      coreutils
+      darwin
+      dockerTools
+      emacs26-nox
+      emacsPackagesFor
+      fetchFromGitHub
+      git
+      gnutar
+      go
+      google-cloud-sdk
+      gzip
+      haskell
+      iana-etc
+      jq
+      kontemplate
+      lib
+      lispPackages
+      llvmPackages
+      makeWrapper
+      mdbook
+      nix
+      openssh
+      openssl
+      protobuf
+      remarshal
+      ripgrep
+      rsync
+      runCommand
+      rustPlatform
+      rustc
+      sbcl
+      stdenv
+      symlinkJoin
+      terraform_0_12
+      tree
+      writeShellScriptBin
+      writeText
+      writeTextFile
+      zlib;
+  };
+
+in exposed // {
+  callPackage = nixpkgs.lib.callPackageWith exposed;
+  # Provide the source code of nixpkgs, but do not provide an imported
+  # version of it.
+  nixpkgsSrc = stableSrc;
+}
diff --git a/third_party/gopkgs/cloud.google.com/go/default.nix b/third_party/gopkgs/cloud.google.com/go/default.nix
new file mode 100644
index 000000000000..d3855291a9cc
--- /dev/null
+++ b/third_party/gopkgs/cloud.google.com/go/default.nix
@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "cloud.google.com/go";
+  src = builtins.fetchGit {
+    url = "https://code.googlesource.com/gocloud";
+    rev = "4f03f8e4ba168c636e1c218da7ab41a1c8c0d8cf";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+  ];
+}
diff --git a/third_party/gopkgs/github.com/golang/protobuf/default.nix b/third_party/gopkgs/github.com/golang/protobuf/default.nix
new file mode 100644
index 000000000000..f1c54cd496eb
--- /dev/null
+++ b/third_party/gopkgs/github.com/golang/protobuf/default.nix
@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "github.com/golang/protobuf";
+  src = builtins.fetchGit {
+    url = "https://github.com/golang/protobuf";
+    rev = "ed6926b37a637426117ccab59282c3839528a700";
+  };
+
+  deps = with pkgs.third_party; [
+  ];
+}
diff --git a/third_party/gopkgs/github.com/googleapis/gax-go/default.nix b/third_party/gopkgs/github.com/googleapis/gax-go/default.nix
new file mode 100644
index 000000000000..fe694fdbbece
--- /dev/null
+++ b/third_party/gopkgs/github.com/googleapis/gax-go/default.nix
@@ -0,0 +1,19 @@
+{ pkgs, ... }:
+
+let
+  inherit (pkgs) buildGo;
+  inherit (builtins) fetchGit;
+in pkgs.buildGo.external {
+  path = "github.com/googleapis/gax-go";
+  src = fetchGit {
+    url = "https://github.com/googleapis/gax-go";
+    rev = "b443e5a67ec8eeac76f5f384004931878cab24b3";
+  };
+
+  deps = with pkgs.third_party; [
+    gopkgs."golang.org".x.net.trace.gopkg
+    gopkgs."google.golang.org".grpc.gopkg
+    gopkgs."google.golang.org".grpc.codes.gopkg
+    gopkgs."google.golang.org".grpc.status.gopkg
+  ];
+}
diff --git a/third_party/gopkgs/github.com/hashicorp/golang-lru/default.nix b/third_party/gopkgs/github.com/hashicorp/golang-lru/default.nix
new file mode 100644
index 000000000000..04efc3144d9a
--- /dev/null
+++ b/third_party/gopkgs/github.com/hashicorp/golang-lru/default.nix
@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "github.com/hashicorp/golang-lru";
+  src = builtins.fetchGit {
+    url = "https://github.com/hashicorp/golang-lru";
+    rev = "7f827b33c0f158ec5dfbba01bb0b14a4541fd81d";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+    gopkgs."golang.org".x.net.context.ctxhttp
+    gopkgs."cloud.google.com".go.compute.metadata
+  ];
+}
diff --git a/third_party/gopkgs/go.opencensus.io/default.nix b/third_party/gopkgs/go.opencensus.io/default.nix
new file mode 100644
index 000000000000..4cab5e5dceba
--- /dev/null
+++ b/third_party/gopkgs/go.opencensus.io/default.nix
@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "go.opencensus.io";
+  src = builtins.fetchGit {
+    url = "https://github.com/census-instrumentation/opencensus-go";
+    rev = "643eada29081047b355cfaa1ceb9bc307a10423c";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+    gopkgs."github.com".hashicorp.golang-lru.simplelru
+    gopkgs."github.com".golang.groupcache.lru
+  ];
+}
diff --git a/third_party/gopkgs/golang.org/x/net/default.nix b/third_party/gopkgs/golang.org/x/net/default.nix
new file mode 100644
index 000000000000..400ba6922b58
--- /dev/null
+++ b/third_party/gopkgs/golang.org/x/net/default.nix
@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "golang.org/x/net";
+  src = builtins.fetchGit {
+    url = "https://go.googlesource.com/net";
+    rev = "c0dbc17a35534bf2e581d7a942408dc936316da4";
+  };
+
+  deps = with pkgs.third_party; [
+    gopkgs."golang.org".x.text.secure.bidirule.gopkg
+    gopkgs."golang.org".x.text.unicode.bidi.gopkg
+    gopkgs."golang.org".x.text.unicode.norm.gopkg
+  ];
+}
diff --git a/third_party/gopkgs/golang.org/x/oauth2/default.nix b/third_party/gopkgs/golang.org/x/oauth2/default.nix
new file mode 100644
index 000000000000..f5e783b6d189
--- /dev/null
+++ b/third_party/gopkgs/golang.org/x/oauth2/default.nix
@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "golang.org/x/oauth2";
+  src = builtins.fetchGit {
+    url = "https://go.googlesource.com/oauth2";
+    rev = "858c2ad4c8b6c5d10852cb89079f6ca1c7309787";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+    gopkgs."golang.org".x.net.context.ctxhttp
+    gopkgs."cloud.google.com".go.compute.metadata
+  ];
+}
diff --git a/third_party/gopkgs/golang.org/x/sys/default.nix b/third_party/gopkgs/golang.org/x/sys/default.nix
new file mode 100644
index 000000000000..037116009962
--- /dev/null
+++ b/third_party/gopkgs/golang.org/x/sys/default.nix
@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "golang.org/x/sys";
+  src = builtins.fetchGit {
+    url = "https://go.googlesource.com/sys";
+    rev = "ac6580df4449443a05718fd7858c1f91ad5f8d20";
+  };
+
+  deps = with pkgs.third_party; [
+  ];
+}
diff --git a/third_party/gopkgs/golang.org/x/text/default.nix b/third_party/gopkgs/golang.org/x/text/default.nix
new file mode 100644
index 000000000000..409b0d0b9e2e
--- /dev/null
+++ b/third_party/gopkgs/golang.org/x/text/default.nix
@@ -0,0 +1,12 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "golang.org/x/text";
+  src = builtins.fetchGit {
+    url = "https://go.googlesource.com/text";
+    rev = "cbf43d21aaebfdfeb81d91a5f444d13a3046e686";
+  };
+
+  deps = with pkgs.third_party; [
+  ];
+}
diff --git a/third_party/gopkgs/google.golang.org/api/default.nix b/third_party/gopkgs/google.golang.org/api/default.nix
new file mode 100644
index 000000000000..a4e7339a3f8a
--- /dev/null
+++ b/third_party/gopkgs/google.golang.org/api/default.nix
@@ -0,0 +1,20 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "google.golang.org/api";
+  src = builtins.fetchGit {
+    url = "https://code.googlesource.com/google-api-go-client";
+    rev = "8b4e46d953bd748a9ff098644a42389b3d8dab41";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+    gopkgs."github.com".googleapis.gax-go.v2
+    gopkgs."golang.org".x.oauth2.google
+    gopkgs."golang.org".x.oauth2
+    gopkgs."google.golang.org".grpc
+    gopkgs."google.golang.org".grpc.naming
+    gopkgs."go.opencensus.io".plugin.ochttp
+    gopkgs."go.opencensus.io".trace
+    gopkgs."go.opencensus.io".trace.propagation
+  ];
+}
diff --git a/third_party/gopkgs/google.golang.org/genproto/default.nix b/third_party/gopkgs/google.golang.org/genproto/default.nix
new file mode 100644
index 000000000000..50280296b84d
--- /dev/null
+++ b/third_party/gopkgs/google.golang.org/genproto/default.nix
@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "google.golang.org/genproto";
+  src = builtins.fetchGit {
+    url = "https://github.com/google/go-genproto";
+    rev = "0243a4be9c8f1264d238fdc2895620b4d9baf9e1";
+  };
+
+  deps = with pkgs.third_party; [
+    gopkgs."github.com".golang.protobuf.proto.gopkg
+    gopkgs."github.com".golang.protobuf.ptypes.any.gopkg
+  ];
+}
diff --git a/third_party/gopkgs/google.golang.org/grpc/default.nix b/third_party/gopkgs/google.golang.org/grpc/default.nix
new file mode 100644
index 000000000000..badc811c9fa8
--- /dev/null
+++ b/third_party/gopkgs/google.golang.org/grpc/default.nix
@@ -0,0 +1,21 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.external {
+  path = "google.golang.org/grpc";
+  src = builtins.fetchGit {
+    url = "https://github.com/grpc/grpc-go";
+    rev = "085c980048876e2735d4aba8f0d5bca4d7acaaa5";
+  };
+
+  deps = with pkgs.third_party; map (p: p.gopkg) [
+    gopkgs."golang.org".x.net.trace
+    gopkgs."golang.org".x.net.http2
+    gopkgs."golang.org".x.net.http2.hpack
+    gopkgs."golang.org".x.sys.unix
+    gopkgs."github.com".golang.protobuf.proto
+    gopkgs."github.com".golang.protobuf.ptypes
+    gopkgs."github.com".golang.protobuf.ptypes.duration
+    gopkgs."github.com".golang.protobuf.ptypes.timestamp
+    gopkgs."google.golang.org".genproto.googleapis.rpc.status
+  ];
+}
diff --git a/third_party/naersk/default.nix b/third_party/naersk/default.nix
new file mode 100644
index 000000000000..918f0c5c0f55
--- /dev/null
+++ b/third_party/naersk/default.nix
@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+let inherit (pkgs.third_party) callPackage fetchFromGitHub;
+in callPackage (fetchFromGitHub {
+  owner = "nmattia";
+  repo = "naersk";
+  rev = "68c1c2b2b661913cdc5ecabea518dfdc4f449027";
+  sha256 = "1ll310pl44kdbwfslzwvg2v7khf1y0xkg2j5wcfia4k7sj6bcl28";
+}) {}
diff --git a/third_party/nixery/default.nix b/third_party/nixery/default.nix
new file mode 100644
index 000000000000..b4c083765184
--- /dev/null
+++ b/third_party/nixery/default.nix
@@ -0,0 +1,18 @@
+# Technically I suppose Nixery is not a third-party program, but it's
+# outside of this repository ...
+{ pkgs, ... }:
+
+let src = pkgs.third_party.fetchFromGitHub {
+  owner = "google";
+  repo = "nixery";
+  rev = "4f6ce83f9296545d6c74321b37d18545764c8827";
+  sha256 = "19aiak1pss6vwm0fwn02827l5ir78fkqglfbdl2gchsyv3gps8bg";
+};
+in import src {
+  pkgs = pkgs.third_party;
+  preLaunch = ''
+    export USER=root
+    cachix use tazjin
+  '';
+  extraPackages = [ pkgs.third_party.cachix ];
+}
diff --git a/third_party/ormolu/default.nix b/third_party/ormolu/default.nix
new file mode 100644
index 000000000000..eed5c7981e43
--- /dev/null
+++ b/third_party/ormolu/default.nix
@@ -0,0 +1,8 @@
+{ pkgs, ... }:
+
+import (pkgs.third_party.fetchFromGitHub {
+  owner = "tweag";
+  repo = "ormolu";
+  rev = "a7076c0f83e5c06ea9067b71171859fa2ba8afd9";
+  sha256 = "1p4n2ja4ciw3qfskn65ggpy37mvgf2sslxqmqn8s8jjarnqcyfny";
+}) { pkgs = pkgs.third_party; }
diff --git a/third_party/terraform-gcp/default.nix b/third_party/terraform-gcp/default.nix
new file mode 100644
index 000000000000..465b74e4e1b9
--- /dev/null
+++ b/third_party/terraform-gcp/default.nix
@@ -0,0 +1,3 @@
+{ pkgs, ... }:
+
+pkgs.third_party.terraform_0_12.withPlugins(p: [ p.google p.google-beta ])
diff --git a/tools/aoc2019/default.nix b/tools/aoc2019/default.nix
new file mode 100644
index 000000000000..a53586eea9eb
--- /dev/null
+++ b/tools/aoc2019/default.nix
@@ -0,0 +1,22 @@
+# Solutions for Advent of Code 2019, written in Emacs Lisp.
+#
+# For each day a new file is created as "solution-day$n.el".
+{ pkgs, ... }:
+
+let
+  inherit (builtins) attrNames filter head listToAttrs match readDir;
+  dir = readDir ./.;
+  matchSolution = match "solution-(.*)\.el";
+  isSolution = f: (matchSolution f) != null;
+  getDay = f: head (matchSolution f);
+
+  solutionFiles = filter (e: dir."${e}" == "regular" && isSolution e) (attrNames dir);
+  solutions = map (f: let day = getDay f; in {
+    name = day;
+    value = pkgs.writeElispBin {
+      name = "aoc2019";
+      deps = p: with p; [ dash s ht ];
+      src = ./. + ("/" + f);
+    };
+  }) solutionFiles;
+in listToAttrs solutions
diff --git a/tools/aoc2019/solution-day1.el b/tools/aoc2019/solution-day1.el
new file mode 100644
index 000000000000..d805c22ec870
--- /dev/null
+++ b/tools/aoc2019/solution-day1.el
@@ -0,0 +1,28 @@
+;; Advent of Code 2019 - Day 1
+(require 'dash)
+
+;; Puzzle 1:
+
+(defvar day-1/input
+  '(83285 96868 121640 51455 128067 128390 141809 52325 68310 140707 124520 149678
+          87961 52040 133133 52203 117483 85643 84414 86558 65402 122692 88565 61895
+          126271 128802 140363 109764 53600 114391 98973 124467 99574 69140 144856
+          56809 149944 138738 128823 82776 77557 51994 74322 64716 114506 124074
+          73096 97066 96731 149307 135626 121413 69575 98581 50570 60754 94843 72165
+          146504 53290 63491 50936 79644 119081 70218 85849 133228 114550 131943
+          67288 68499 80512 148872 99264 119723 68295 90348 146534 52661 99146 95993
+          130363 78956 126736 82065 77227 129950 97946 132345 107137 79623 148477
+          88928 118911 75277 97162 80664 149742 88983 74518))
+
+(defun calculate-fuel (mass)
+  (- (/ mass 3) 2))
+
+(message "Solution to day1/1: %d" (apply #'+ (-map #'calculate-fuel day-1/input)))
+
+;; Puzzle 2:
+(defun calculate-recursive-fuel (mass)
+  (let ((fuel (calculate-fuel mass)))
+    (if (< fuel 0) 0
+      (+ fuel (calculate-recursive-fuel fuel)))))
+
+(message "Solution to day1/2: %d" (apply #'+ (-map #'calculate-recursive-fuel day-1/input)))
diff --git a/tools/aoc2019/solution-day2.el b/tools/aoc2019/solution-day2.el
new file mode 100644
index 000000000000..6ecac1e2016c
--- /dev/null
+++ b/tools/aoc2019/solution-day2.el
@@ -0,0 +1,53 @@
+;; -*- lexical-binding: t; -*-
+;; Advent of Code 2019 - Day 2
+(require 'dash)
+(require 'ht)
+
+(defvar day2/input
+  [1 0 0 3 1 1 2 3 1 3 4 3 1 5 0 3 2 1 9 19 1 19 5 23 1 13 23 27 1 27 6 31
+     2 31 6 35 2 6 35 39 1 39 5 43 1 13 43 47 1 6 47 51 2 13 51 55 1 10 55
+     59 1 59 5 63 1 10 63 67 1 67 5 71 1 71 10 75 1 9 75 79 2 13 79 83 1 9
+     83 87 2 87 13 91 1 10 91 95 1 95 9 99 1 13 99 103 2 103 13 107 1 107 10
+     111 2 10 111 115 1 115 9 119 2 119 6 123 1 5 123 127 1 5 127 131 1 10
+     131 135 1 135 6 139 1 10 139 143 1 143 6 147 2 147 13 151 1 5 151 155 1
+     155 5 159 1 159 2 163 1 163 9 0 99 2 14 0 0])
+
+;; Puzzle 1
+
+(defun day2/single-op (f state idx)
+  (let* ((a (aref state (aref state (+ 1 idx))))
+         (b (aref state (aref state (+ 2 idx))))
+         (p (aref state (+ 3 idx)))
+         (result (funcall f a b)))
+    (aset state p (funcall f a b))))
+
+(defun day2/operate (state idx)
+  (pcase (aref state idx)
+    (99 (aref state 0))
+    (1 (day2/single-op #'+ state idx)
+       (day2/operate state (+ 4 idx)))
+    (2 (day2/single-op #'* state idx)
+       (day2/operate state (+ 4 idx)))
+    (other (error "Unknown opcode: %s" other))))
+
+(defun day2/program-with-inputs (noun verb)
+  (let* ((input (copy-tree day2/input t)))
+    (aset input 1 noun)
+    (aset input 2 verb)
+    (day2/operate input 0)))
+
+(message "Solution to day2/1: %s" (day2/program-with-inputs 12 2))
+
+;; Puzzle 2
+(let* ((used (ht))
+       (noun 0)
+       (verb 0)
+       (result (day2/program-with-inputs noun verb)))
+  (while (/= 19690720 result)
+    (setq noun (random 100))
+    (setq verb (random 100))
+    (unless (ht-get used (format "%d%d" noun verb))
+      (ht-set used (format "%d%d" noun verb) t)
+      (setq result (day2/program-with-inputs noun verb))))
+
+  (message "Solution to day2/2: %s%s" noun verb))
diff --git a/tools/aoc2019/solution-day3.el b/tools/aoc2019/solution-day3.el
new file mode 100644
index 000000000000..c0d2eb5ee657
--- /dev/null
+++ b/tools/aoc2019/solution-day3.el
@@ -0,0 +1,58 @@
+;; -*- lexical-binding: t; -*-
+;; Advent of Code 2019 - Day 3
+;;
+;; Note: Input was pre-processed with some Emacs shortcuts.
+(require 'cl)
+(require 'dash)
+(require 'ht)
+(require 's)
+
+(defvar day3/input/wire1
+  "R1010,D422,L354,U494,L686,U894,R212,U777,L216,U9,L374,U77,R947,U385,L170,U916,R492,D553,L992,D890,L531,U360,R128,U653,L362,U522,R817,U198,L126,D629,L569,U300,L241,U145,R889,D196,L450,D576,L319,D147,R985,U889,L941,U837,L608,D77,L864,U911,L270,D869,R771,U132,L249,U603,L36,D328,L597,U992,L733,D370,L947,D595,L308,U536,L145,U318,R55,D773,R175,D505,R483,D13,R780,U778,R445,D107,R490,U245,L587,U502,R446,U639,R150,U35,L455,D522,R866,U858,R394,D975,R513,D378,R58,D646,L374,D675,R209,U228,R530,U543,L480,U677,L912,D164,L573,U587,L784,D626,L994,U250,L215,U985,R684,D79,L877,U811,L766,U617,L665,D246,L408,U800,L360,D272,L436,U138,R240,U735,L681,U68,L608,D59,R532,D808,L104,U968,R887,U819,R346,U698,L317,U582,R516,U55,L303,U607,L457,U479,L510,D366,L583,U519,R878,D195,R970,D267,R842,U784,R9,D946,R833,D238,L232,D94,L860,D47,L346,U951,R491,D745,R849,U273,R263,U392,L341,D808,R696,U326,R886,D296,L865,U833,R241,U644,R729,D216,R661,D712,L466,D699,L738,U5,L556,D693,R912,D13,R48,U63,L877,U628,L689,D929,R74,U924,R612,U153,R417,U425,L879,D378,R79,D248,L3,U519,R366,U281,R439,D823,R149,D668,R326,D342,L213,D735,R504,U265,L718,D842,L565,U105,L214,U963,R518,D681,R642,U170,L111,U6,R697,U572,R18,U331,L618,D255,R534,D322,L399,U595,L246,U651,L836,U757,R417,D795,R291,U759,L568,U965,R828,D570,R350,U317,R338,D173,L74,D833,L650,D844,L70,U913,R594,U407,R674,D684,L481,D564,L128,D277,R851,D274,L435,D582,R469,U729,R387,D818,R443,U504,R414,U8,L842,U845,R275,U986,R53,U660,R661,D225,R614,U159,R477")
+
+(defvar day3/input/wire2
+  "L1010,D698,R442,U660,L719,U702,L456,D86,R938,D177,L835,D639,R166,D285,L694,U468,L569,D104,L234,D574,L669,U299,L124,D275,L179,D519,R617,U72,L985,D248,R257,D276,L759,D834,R490,U864,L406,U181,R911,U873,R261,D864,R260,U759,R648,U158,R308,D386,L835,D27,L745,U91,R840,U707,R275,U543,L663,U736,L617,D699,R924,U103,R225,U455,R708,U319,R569,U38,R315,D432,L179,D975,R519,D546,L295,U680,L685,U603,R262,D250,R7,U171,R261,U519,L832,U534,L471,U431,L474,U886,R10,D179,L79,D555,R452,U452,L832,U863,L367,U538,L237,D160,R441,U605,R942,U259,L811,D552,R646,D353,L225,D94,L35,D307,R752,U23,R698,U610,L379,D932,R698,D751,R178,D347,R325,D156,R471,D555,R558,D593,R773,U2,L955,U764,L735,U438,R364,D640,L757,U534,R919,U409,R361,U407,R336,D808,R877,D648,R610,U198,R340,U94,R795,D667,R811,U975,L965,D224,R565,D681,L64,U567,R621,U922,L665,U329,R242,U592,L727,D481,L339,U402,R213,D280,R656,U169,R976,D962,L294,D505,L251,D689,L497,U133,R230,D441,L90,D220,L896,D657,L500,U331,R502,U723,R762,D613,L447,D256,L226,U309,L935,U384,L740,D459,R309,D707,R952,D747,L304,D105,R977,D539,R941,D21,R291,U216,R132,D543,R515,U453,L854,D42,R982,U102,L469,D639,R559,D68,R302,U734,R980,D214,R107,D191,L730,D793,L63,U17,R807,U196,R412,D592,R330,D941,L87,D291,L44,D94,L272,D780,R968,U837,L712,D704,R163,U981,R537,U778,R220,D303,L196,D951,R163,D446,R11,D623,L72,D778,L158,U660,L189,D510,L247,D716,L89,U887,L115,U114,L36,U81,R927,U293,L265,U183,R331,D267,R745,D298,L561,D918,R299,U810,L322,U679,L739,D854,L581,U34,L862,D779,R23")
+
+;; Puzzle 1
+
+(defun wire-from (raw)
+  (-map (lambda (s)
+          (cons (substring s 0 1) (string-to-number (substring s 1))))
+        (s-split "," raw)))
+
+(defun day3/move (x y next)
+  (cl-flet ((steps (by op)
+                   (-map op (reverse (number-sequence 1 by)))))
+    (pcase next
+      (`("L" . ,by) (steps by (lambda (n) (cons (- x n) y))))
+      (`("R" . ,by) (steps by (lambda (n) (cons (+ x n) y))))
+      (`("U" . ,by) (steps by (lambda (n) (cons x (+ y n)))))
+      (`("D" . ,by) (steps by (lambda (n) (cons x (- y n))))))))
+
+(defun day3/wire-points (wire)
+  (let ((points (ht))
+        (point-list (-reduce-from
+                     (lambda (acc point)
+                       (-let* (((x . y) (car acc))
+                               (next (day3/move x y point)))
+                         (-concat next acc)))
+                     '((0 . 0)) wire)))
+    (-map (lambda (p) (ht-set! points p t)) point-list)
+    (ht-remove! points '(0 . 0))
+    points))
+
+(defun day3/closest-intersection (wire1 wire2)
+  (let* ((wire1-points (day3/wire-points (wire-from wire1)))
+         (wire2-points (day3/wire-points (wire-from wire2)))
+         (crossed-points (-filter (lambda (p) (ht-contains? wire1-points p))
+                                  (ht-keys wire2-points))))
+
+    (car (-sort #'<
+                (-map (-lambda ((x . y))
+                        (+ (abs x) (abs y)))
+                      crossed-points)))))
+
+(message "Solution form day3/1: %d"
+         (day3/closest-intersection day3/input/wire1
+                                    day3/input/wire2))
+
diff --git a/tools/bin/__dispatch.sh b/tools/bin/__dispatch.sh
new file mode 100755
index 000000000000..fb8a4d779185
--- /dev/null
+++ b/tools/bin/__dispatch.sh
@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# This script dispatches invocations transparently to programs instantiated from
+# Nix.
+#
+# To add a new tool, insert it into the case statement below by setting `attr`
+# to the key in nixpkgs which represents the program you want to run.
+set -ueo pipefail
+
+readonly REPO_ROOT=$(git rev-parse --show-toplevel)
+readonly TARGET_TOOL=$(basename $0)
+
+case "${TARGET_TOOL}" in
+  terraform)
+    attr="third_party.terraform-gcp"
+    ;;
+  kontemplate)
+    attr="kontemplate"
+    ;;
+  blog_cli)
+    attr="tools.blog_cli"
+    ;;
+  stern)
+    attr="stern"
+    ;;
+  pass)
+    attr="tools.kms_pass"
+    ;;
+  aoc2019)
+    attr="tools.aoc2019.${1}"
+    ;;
+  *)
+    echo "The tool '${TARGET_TOOL}' is currently not installed in this repository."
+    exit 1
+    ;;
+esac
+
+result=$(nix-build --no-out-link --attr "${attr}" "${REPO_ROOT}")
+PATH="${result}/bin:$PATH"
+
+exec "${TARGET_TOOL}" "${@}"
diff --git a/tools/bin/aoc2019 b/tools/bin/aoc2019
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/aoc2019
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/bin/blog_cli b/tools/bin/blog_cli
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/blog_cli
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/bin/kontemplate b/tools/bin/kontemplate
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/kontemplate
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/bin/pass b/tools/bin/pass
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/pass
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/bin/stern b/tools/bin/stern
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/stern
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/bin/terraform b/tools/bin/terraform
new file mode 120000
index 000000000000..8390ec9c9652
--- /dev/null
+++ b/tools/bin/terraform
@@ -0,0 +1 @@
+__dispatch.sh
\ No newline at end of file
diff --git a/tools/blog_cli/README.md b/tools/blog_cli/README.md
new file mode 100644
index 000000000000..7afa0fe9207a
--- /dev/null
+++ b/tools/blog_cli/README.md
@@ -0,0 +1,41 @@
+tazblog CLI
+===========
+
+My blog stores its content in DNS, spread out over three types of `TXT` entries:
+
+* `TXT _posts.blog.tazj.in.`: A sorted list of posts, serialised as a JSON list of
+  strings (e.g. `["1486830338", "1476807384"]`)
+
+* `TXT _chunks.$postID.blog.tazj.in`: JSON chunks containing the blog post text
+
+* `TXT _meta.$postID.blog.tazj.in`: JSON blob with blog post metadata
+
+All JSON blobs are base64-encoded.
+
+This CLI tool helps to update those records.
+
+Each blog post data is a series of JSON-encoded structures which follow one of
+these formats:
+
+```
+struct metadata {
+    chunks: int
+    title: string
+    date: date
+}
+```
+
+Where `chunks` describes the number of chunks following this format:
+
+```
+struct chunk {
+    c: int
+    t: string
+}
+```
+
+Writing a blog post to DNS means taking its text and metadata, chunking it up
+and writing the chunks.
+
+Reading a blog post means retrieving all data, reading the metadata and then
+assembling the chunks in order.
diff --git a/tools/blog_cli/default.nix b/tools/blog_cli/default.nix
new file mode 100644
index 000000000000..c22e4c949bc1
--- /dev/null
+++ b/tools/blog_cli/default.nix
@@ -0,0 +1,9 @@
+{ pkgs, ... }:
+
+pkgs.buildGo.program {
+  name = "blog_cli";
+  srcs = [ ./main.go ];
+  deps = with pkgs.third_party; [
+    gopkgs."google.golang.org".api.dns.v1.gopkg
+  ];
+} // { meta.enableCI = true; }
diff --git a/tools/blog_cli/main.go b/tools/blog_cli/main.go
new file mode 100644
index 000000000000..db64f8378e40
--- /dev/null
+++ b/tools/blog_cli/main.go
@@ -0,0 +1,209 @@
+// The tazblog CLI implements updating my blog records in DNS, see the
+// README in this folder for details.
+//
+// The post input format is a file with the title on one line,
+// followed by the date on a line, followed by an empty line, followed
+// by the post text.
+package main
+
+import (
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"time"
+
+	"google.golang.org/api/dns/v1"
+)
+
+var (
+	project = flag.String("project", "tazjins-infrastructure", "Target GCP project")
+	zone    = flag.String("zone", "blog-tazj-in", "Target Cloud DNS zone")
+	title   = flag.String("title", "", "Title of the blog post")
+	date    = flag.String("date", "", "Date the post was written on")
+	infile  = flag.String("text", "", "Text file containing the blog post")
+	id      = flag.String("id", "", "Post ID - will be generated if unset")
+)
+
+// Number of runes to include in a single chunk. If any chunks exceed
+// the limit of what can be encoded, the chunk size is reduced and we
+// try again.
+var chunkSize = 200
+
+type day time.Time
+
+func (d day) MarshalJSON() ([]byte, error) {
+	j := (time.Time(d)).Format(`"2006-01-02"`)
+	return []byte(j), nil
+}
+
+type metadata struct {
+	Chunks int    `json:"c"`
+	Title  string `json:"t"`
+	Date   day    `json:"d"`
+}
+
+type chunk struct {
+	Chunk int
+	Text  string
+}
+
+type post struct {
+	ID     string
+	Meta   metadata
+	Chunks []string
+}
+
+func (p *post) writeToDNS() error {
+	var additions []*dns.ResourceRecordSet
+	additions = append(additions, &dns.ResourceRecordSet{
+		Name: fmt.Sprintf("_meta.%s.blog.tazj.in.", p.ID),
+		Type: "TXT",
+		Ttl:  1200,
+		Rrdatas: []string{
+			encodeJSON(p.Meta),
+		},
+	})
+
+	for i, c := range p.Chunks {
+		additions = append(additions, &dns.ResourceRecordSet{
+			Name:    fmt.Sprintf("_%v.%s.blog.tazj.in.", i, p.ID),
+			Type:    "TXT",
+			Ttl:     1200,
+			Rrdatas: []string{c},
+		})
+	}
+
+	ctx := context.Background()
+	dnsSvc, err := dns.NewService(ctx)
+	if err != nil {
+		return err
+	}
+
+	change := dns.Change{
+		Additions: additions,
+	}
+
+	_, err = dnsSvc.Changes.Create(*project, *zone, &change).Do()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// Encode given value as JSON and base64-encode it.
+func encodeJSON(v interface{}) string {
+	outer, err := json.Marshal(v)
+	if err != nil {
+		log.Fatalln("Failed to encode JSON", err)
+	}
+
+	return base64.RawStdEncoding.EncodeToString(outer)
+}
+
+// Encode a chunk and check whether it is too large
+func encodeChunk(c chunk) (string, bool) {
+	tooLarge := false
+	s := base64.RawStdEncoding.EncodeToString([]byte(c.Text))
+
+	if len(s) >= 255 {
+		tooLarge = true
+	}
+
+	return s, tooLarge
+}
+
+func createPost(id, title, text string, date day) post {
+	runes := []rune(text)
+	n := 0
+	tooLarge := false
+
+	var chunks []string
+
+	for chunkSize < len(runes) {
+		c, l := encodeChunk(chunk{
+			Chunk: n,
+			Text:  string(runes[0:chunkSize:chunkSize]),
+		})
+
+		tooLarge = tooLarge || l
+		chunks = append(chunks, c)
+		runes = runes[chunkSize:]
+		n++
+	}
+
+	if len(runes) > 0 {
+		c, l := encodeChunk(chunk{
+			Chunk: n,
+			Text:  string(runes),
+		})
+
+		tooLarge = tooLarge || l
+		chunks = append(chunks, c)
+		n++
+	}
+
+	if tooLarge {
+		log.Println("Too large at chunk size", chunkSize)
+		chunkSize -= 5
+		return createPost(id, title, text, date)
+	}
+
+	return post{
+		ID: id,
+		Meta: metadata{
+			Chunks: n,
+			Title:  title,
+			Date:   date,
+		},
+		Chunks: chunks,
+	}
+}
+
+func main() {
+	flag.Parse()
+
+	if *title == "" {
+		log.Fatalln("Post title must be set (-title)")
+	}
+
+	if *infile == "" {
+		log.Fatalln("Post text file must be set (-text)")
+	}
+
+	if *id == "" {
+		log.Fatalln("Post ID must be set (-id)")
+	}
+
+	var postDate day
+	if *date != "" {
+		t, err := time.Parse("2006-01-02", *date)
+		if err != nil {
+			log.Fatalln("Invalid post date", err)
+		}
+
+		postDate = day(t)
+	} else {
+		postDate = day(time.Now())
+	}
+
+	t, err := ioutil.ReadFile(*infile)
+	if err != nil {
+		log.Fatalln("Failed to read post:", err)
+	}
+
+	post := createPost(*id, *title, string(t), postDate)
+
+	log.Println("Writing post to DNS ...")
+	err = post.writeToDNS()
+
+	if err != nil {
+		log.Fatalln("Failed to write post:", err)
+	}
+
+	log.Println("Successfully wrote entries")
+}
diff --git a/tools/gotest/default.nix b/tools/gotest/default.nix
new file mode 100644
index 000000000000..168d15748e1f
--- /dev/null
+++ b/tools/gotest/default.nix
@@ -0,0 +1,27 @@
+# This file demonstrates how to make use of pkgs.buildGo.
+#
+# It introduces libraries and protobuf support, however gRPC support
+# is not yet included.
+#
+# From the root of this repository this example can be built with
+# `nix-build -A tools.gotest`
+{ pkgs, ... }:
+
+let
+  inherit (pkgs) buildGo;
+
+  somelib = buildGo.package {
+    name = "somelib";
+    srcs = [ ./lib.go ];
+  };
+
+  someproto = buildGo.proto {
+    name = "someproto";
+    proto = ./test.proto;
+  };
+
+in buildGo.program {
+  name = "gotest";
+  srcs = [ ./main.go ];
+  deps = [ somelib someproto ];
+} // { meta.enableCI = true; }
diff --git a/tools/gotest/lib.go b/tools/gotest/lib.go
new file mode 100644
index 000000000000..0aeebb2aea69
--- /dev/null
+++ b/tools/gotest/lib.go
@@ -0,0 +1,11 @@
+package somelib
+
+import "fmt"
+
+func Name() string {
+	return "edef"
+}
+
+func Greet(s string) string {
+	return fmt.Sprintf("Hello %s", s)
+}
diff --git a/tools/gotest/main.go b/tools/gotest/main.go
new file mode 100644
index 000000000000..99218c077617
--- /dev/null
+++ b/tools/gotest/main.go
@@ -0,0 +1,16 @@
+// This program just exists to import some libraries and demonstrate
+// that the build works, it doesn't do anything useful.
+package main
+
+import (
+	"fmt"
+	"somelib"
+	"someproto"
+)
+
+func main() {
+	p := someproto.Person{
+		Name: somelib.Name(),
+	}
+	fmt.Println(somelib.Greet(fmt.Sprintf("%v", p)))
+}
diff --git a/tools/gotest/test.proto b/tools/gotest/test.proto
new file mode 100644
index 000000000000..76af63072be3
--- /dev/null
+++ b/tools/gotest/test.proto
@@ -0,0 +1,9 @@
+syntax = "proto3";
+package someproto;
+
+import "google/protobuf/timestamp.proto";
+
+message Person {
+  string name = 1;
+  google.protobuf.Timestamp last_updated = 2;
+}
diff --git a/tools/kms_pass.nix b/tools/kms_pass.nix
new file mode 100644
index 000000000000..14989b392dd1
--- /dev/null
+++ b/tools/kms_pass.nix
@@ -0,0 +1,60 @@
+# This tool mimics a subset of the interface of 'pass', but uses
+# Google Cloud KMS for encryption.
+#
+# It is intended to be compatible with how 'kontemplate' invokes
+# 'pass.'
+#
+# Only the 'show' and 'insert' commands are supported.
+
+{ pkgs, kms, ... }:
+
+let inherit (pkgs.third_party) google-cloud-sdk tree writeShellScriptBin;
+in (writeShellScriptBin "pass" ''
+  set -eo pipefail
+
+  CMD="$1"
+  readonly SECRET=$2
+  readonly SECRET_PATH="$SECRETS_DIR/$SECRET"
+
+  function secret_check {
+    if [[ -z $SECRET ]]; then
+      echo 'Secret must be specified'
+      exit 1
+    fi
+  }
+
+  if [[ -z $CMD ]]; then
+    CMD="ls"
+  fi
+
+  case "$CMD" in
+    ls)
+       ${tree}/bin/tree $SECRETS_DIR
+       ;;
+    show)
+      secret_check
+      ${google-cloud-sdk}/bin/gcloud kms decrypt \
+        --project ${kms.project} \
+        --location ${kms.region} \
+        --keyring ${kms.keyring} \
+        --key ${kms.key} \
+        --ciphertext-file $SECRET_PATH \
+        --plaintext-file -
+      ;;
+    insert)
+      secret_check
+      ${google-cloud-sdk}/bin/gcloud kms encrypt \
+        --project ${kms.project} \
+        --location ${kms.region} \
+        --keyring ${kms.keyring} \
+        --key ${kms.key} \
+        --ciphertext-file $SECRET_PATH \
+        --plaintext-file -
+      echo "Inserted secret '$SECRET'"
+      ;;
+    *)
+      echo "Usage: pass show/insert <secret>"
+      exit 1
+      ;;
+  esac
+'') // { meta.enableCI = true; }