feat(grfn/bbbg): Production deployment r/3456

Start of a production deployment of the app with nixos+terraform, using
provisioners and null-resources to provision nixos machines a'la espes.

Change-Id: I2ddaed76d0037dadbf9fc9e2ee27e9e67a852228
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4695
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

1 files changed, 104 insertions, 0 deletions

diff --git a/users/grfn/terraform/workspace.nix b/users/grfn/terraform/workspace.nix
new file mode 100644
index 000000000000..c2a0fdb97793
--- /dev/null
+++ b/users/grfn/terraform/workspace.nix
@@ -0,0 +1,104 @@
+{ pkgs, depot, ... }:
+name: { plugins }: module_tf:
+
+let
+
+  inherit (pkgs) lib runCommandNoCC writeText writeScript;
+  inherit (lib) filterAttrsRecursive;
+
+  allPlugins = (p: plugins p ++ (with p; [
+    external
+    local
+    tls
+    p.null
+  ]));
+
+  tf = pkgs.terraform.withPlugins allPlugins;
+
+  cleanTerraform = filterAttrsRecursive (k: _: ! (builtins.elem k [
+    "__readTree"
+    "__readTreeChildren"
+  ]));
+
+  plugins_tf = {
+    terraform.required_providers = (builtins.listToAttrs (map (p: {
+      name = lib.last (lib.splitString "/" p.provider-source-address);
+      value = {
+        source = p.provider-source-address;
+        version = p.version;
+      };
+    }) (allPlugins pkgs.terraform.plugins)));
+  };
+
+
+  module_tf' = module_tf // {
+    inherit (depot.users.grfn.terraform) globals;
+    plugins = plugins_tf;
+  };
+
+  module = runCommandNoCC "module" {} ''
+    mkdir $out
+    ${lib.concatStrings (lib.mapAttrsToList (k: config_tf:
+      (let
+        # TODO: filterAttrsRecursive?
+        configJson = writeText "${k}.tf.json"
+          (builtins.toJSON (cleanTerraform config_tf));
+      in ''
+        ${pkgs.jq}/bin/jq . ${configJson} > $out/${lib.escapeShellArg k}.tf.json
+      ''))
+      (cleanTerraform module_tf'))}
+  '';
+
+
+  tfcmd = writeScript "${name}-tfcmd" ''
+    set -e
+    dir="''${TF_STATE_ROOT:-$HOME/tfstate}/${name}"
+    cd "$dir"
+    rm -f *.json
+    cp ${module}/*.json .
+    exec ${tf}/bin/terraform "$(basename "$0")"
+  '';
+
+  init = writeScript "${name}-init" ''
+    set -e
+    dir="''${TF_STATE_ROOT:-$HOME/tfstate}/${name}"
+    [ -d "$dir" ] || mkdir -p "$dir"
+    cd "$dir"
+    rm -f *.json
+    cp ${module}/*.json .
+    exec ${tf}/bin/terraform init
+  '';
+
+  # TODO: import (-config)
+  tfcmds = runCommandNoCC "${name}-tfcmds" {} ''
+    mkdir -p $out/bin
+    ln -s ${init} $out/bin/init
+    ln -s ${tfcmd} $out/bin/validate
+    ln -s ${tfcmd} $out/bin/plan
+    ln -s ${tfcmd} $out/bin/apply
+    ln -s ${tfcmd} $out/bin/destroy
+  '';
+
+in {
+  inherit name module;
+  terraform = tf;
+  cmds = tfcmds;
+
+  # run = {
+  #   init = depot.nix.nixRunWrapper "init" tfcmds;
+  #   validate = depot.nix.nixRunWrapper "validate" tfcmds;
+  #   plan = depot.nix.nixRunWrapper "plan" tfcmds;
+  #   apply = depot.nix.nixRunWrapper "apply" tfcmds;
+  #   destroy = depot.nix.nixRunWrapper "destroy" tfcmds;
+  # };
+
+  test = runCommandNoCC "${name}-test" {} ''
+    set -e
+    export TF_STATE_ROOT=$(pwd)
+    ${tfcmds}/bin/init
+    ${tfcmds}/bin/validate
+    touch $out
+  '';
+
+  meta.targets = [ "module" "test" ];
+}