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# Copyright 2022 The TVL Contributors
# SPDX-License-Identifier: Apache-2.0
# This function header aims to provide compatibility between builds of
# Nixery taking place inside/outside of the TVL depot.
#
# In the future, Nixery will transition to using //nix/buildGo for its
# build system and this will need some major adaptations to support
# that.
{ depot ? { nix.readTree.drvTargets = x: x; }
, pkgs ? import <nixpkgs> { }
, preLaunch ? ""
, extraPackages ? [ ]
, maxLayers ? 20
, commitHash ? null
, ...
}@args:
with pkgs;
let
inherit (pkgs) buildGoModule;
# Avoid extracting this from git until we have a way to plumb
# through revision numbers.
nixery-commit-hash = "depot";
in
depot.nix.readTree.drvTargets rec {
# Implementation of the Nix image building logic
nixery-prepare-image = import ./prepare-image { inherit pkgs; };
# Use mdBook to build a static asset page which Nixery can then
# serve. This is primarily used for the public instance at
# nixery.dev.
nixery-book = callPackage ./docs { };
nixery-popcount = callPackage ./popcount { };
# Build Nixery's Go code, resulting in the binaries used for various
# bits of functionality.
#
# The server binary is wrapped to ensure that required environment
# variables are set at runtime.
nixery = buildGoModule rec {
name = "nixery";
src = ./.;
doCheck = true;
# Needs to be updated after every modification of go.mod/go.sum
vendorSha256 = "115dfdhpklgmp6dsy59bp0i9inqim208lf1sqbnl9jy91bnnbl32";
buildFlagsArray = [
"-ldflags=-s -w -X main.version=${nixery-commit-hash}"
];
nativeBuildInputs = [ makeWrapper ];
postInstall = ''
wrapProgram $out/bin/server \
--set WEB_DIR "${nixery-book}" \
--prefix PATH : ${nixery-prepare-image}/bin
'';
# Nixery is mirrored to Github at tazjin/nixery; this is
# automatically updated from CI for canon builds.
passthru.meta.ci.extraSteps.github = depot.tools.releases.filteredGitPush {
filter = ":/tools/nixery";
remote = "git@github.com:tazjin/nixery.git";
ref = "refs/heads/master";
};
};
# Container image containing Nixery and Nix itself. This image can
# be run on Kubernetes, published on AppEngine or whatever else is
# desired.
nixery-image =
let
# Wrapper script for the wrapper script (meta!) which configures
# the container environment appropriately.
#
# Most importantly, sandboxing is disabled to avoid privilege
# issues in containers.
nixery-launch-script = writeShellScriptBin "nixery" ''
set -e
export PATH=${coreutils}/bin:$PATH
export NIX_SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt
mkdir -p /tmp
# Create the build user/group required by Nix
echo 'nixbld:x:30000:nixbld' >> /etc/group
echo 'nixbld:x:30000:30000:nixbld:/tmp:/bin/bash' >> /etc/passwd
echo 'root:x:0:0:root:/root:/bin/bash' >> /etc/passwd
echo 'root:x:0:' >> /etc/group
# Disable sandboxing to avoid running into privilege issues
mkdir -p /etc/nix
echo 'sandbox = false' >> /etc/nix/nix.conf
# In some cases users building their own image might want to
# customise something on the inside (e.g. set up an environment
# for keys or whatever).
#
# This can be achieved by setting a 'preLaunch' script.
${preLaunch}
exec ${nixery}/bin/server
'';
in
dockerTools.buildLayeredImage {
name = "nixery";
config.Cmd = [ "${nixery-launch-script}/bin/nixery" ];
inherit maxLayers;
contents = [
bashInteractive
cacert
coreutils
git
gnutar
gzip
iana-etc
nix
nixery-prepare-image
nixery-launch-script
openssh
zlib
] ++ extraPackages;
};
}
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