infra/services/gerrit/one-way-sync.nix

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{ lib, config, pkgs, ... }:
let
cfg = config.bagel.nixpkgs.one-way-sync;
inherit (lib) mkIf mkOption mkEnableOption types mapAttrs';
mkSyncTimer = { name, timer, ... }: {
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = timer;
Persistent = true;
Unit = "ows-${name}.service";
};
};
mkSyncService = targetRef: { name, fromUri, fromRefspec, localRefspec, ... }: {
path = [ pkgs.gitFull pkgs.openssh pkgs.lix ];
script = ''
set -xe
RUNTIME_DIRECTORY="/run/onewaysync-${name}"
trap "git worktree remove -f "$RUNTIME_DIRECTORY"/${name}" EXIT
if [ ! -d "/var/lib/onewaysync/nixpkgs" ]; then
echo "First run, synchronizing nixpkgs..."
git clone https://cl.forkos.org/nixpkgs /var/lib/onewaysync/nixpkgs
fi
cd /var/lib/onewaysync/nixpkgs
echo "Syncing ${fromUri}:${fromRefspec} to /var/lib/onewaysync/nixpkgs:${targetRef}"
echo "Current ref: $EXPECTED_REF"
git worktree add -f "$RUNTIME_DIRECTORY"/${name} refs/remotes/origin/${localRefspec}
cd "$RUNTIME_DIRECTORY"/${name}
git pull origin ${localRefspec} --no-rebase
EXPECTED_REF=$(git rev-list refs/remotes/origin/${localRefspec} | head -1)
2024-07-19 21:25:26 +00:00
git config user.name Fork-o-Tron
git config user.email noreply@forkos.org
git fetch ${fromUri} ${fromRefspec}
'' + lib.optionalString (!(lib.hasInfix "staging" localRefspec)) ''
OLD_STDENV=$(nix eval -f . stdenv.outPath --store "$RUNTIME_DIRECTORY")
'' + ''
git merge FETCH_HEAD
'' + lib.optionalString (!(lib.hasInfix "staging" localRefspec)) ''
NEW_STDENV=$(nix eval -f . stdenv.outPath --store "$RUNTIME_DIRECTORY")
# Do not allow auto-merging a staging iteration
test "$OLD_STDENV" = "$NEW_STDENV"
'' + ''
GIT_SSH_COMMAND='ssh -i ${cfg.deployKeyPath}' git push ${cfg.pushUrl} HEAD:${targetRef}
'';
serviceConfig = {
User = "git";
Group = "git";
Type = "oneshot";
RuntimeDirectory = "onewaysync-${name}";
WorkingDirectory = "/run/onewaysync-${name}";
StateDirectory = "onewaysync";
};
};
in
{
options.bagel.nixpkgs.one-way-sync = {
enable = mkEnableOption "the one-way sync from GitHub repositories";
referenceDir = mkOption {
type = types.str;
default = "/var/lib/gerrit/git/nixpkgs.git";
description = "Local repository reference";
};
workingDir = mkOption {
type = types.str;
default = "/run/onewaysync/";
description = "Working directory for the service";
};
pushUrl = mkOption {
type = types.str;
example = "ssh://...";
description = "Push URL for the target repository";
};
deployKeyPath = mkOption {
type = types.path;
example = "/run/agenix.d/ows-priv-key";
description = "Deployment private SSH key to push to the repository";
};
branches = mkOption {
type = types.attrsOf (types.submodule ({ ... }:
{
options = {
name = mkOption {
type = types.str;
description = "User-friendly name";
};
fromUri = mkOption {
type = types.str;
description = "Git URI from which we need to sync";
};
fromRefspec = mkOption {
type = types.str;
description = "refspec for the fetch";
};
localRefspec = mkOption {
type = types.str;
default = "local refspec in the local repository to get the expected reference and avoid stale info";
};
timer = mkOption {
type = types.str;
description = "Calendar format everytime we need to run the sync";
};
};
}));
description = "Set of branches mapping from cl.forkos.org to other Git repositories";
};
};
config = mkIf cfg.enable {
systemd.timers = mapAttrs' (name: value: {
name = "ows-${value.name}";
value = mkSyncTimer value;
}) cfg.branches;
systemd.services = mapAttrs' (name: value: {
name = "ows-${value.name}";
value = mkSyncService name value;
}) cfg.branches;
};
}