103 lines
3.0 KiB
Nix
103 lines
3.0 KiB
Nix
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{ config, pkgs, lib, ... }:
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let
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cfg = config.custom.backups.git;
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in
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{
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options.custom.backups.git = {
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enable = lib.mkEnableOption "git";
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repos = lib.mkOption {
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description = "A list of remotes to clone.";
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type = with lib.types; listOf str;
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default = [ ];
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};
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reposFile = lib.mkOption {
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description = "A file containing the remotes to clone, one per line.";
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type = with lib.types; nullOr str;
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default = null;
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};
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sshKey = lib.mkOption {
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description = "SSH private key to use when cloning repositories over SSH.";
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type = with lib.types; nullOr str;
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default = null;
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};
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};
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config = lib.mkIf cfg.enable {
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age.secrets."git-backups/restic/128G".file = ../../secrets/restic/128G.age;
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systemd.services.backup-git = {
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description = "Git repo backup service.";
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serviceConfig = {
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DynamicUser = true;
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CacheDirectory = "backup-git";
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WorkingDirectory = "%C/backup-git";
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LoadCredential = [
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"restic_password:${config.age.secrets."git-backups/restic/128G".path}"
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] ++ (if cfg.sshKey == null then [ ] else [ "id_ecdsa:${cfg.sshKey}" ])
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++ (if cfg.reposFile == null then [ ] else [ "repos_file:${cfg.reposFile}" ]);
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};
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environment = {
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GIT_SSH_COMMAND = "${pkgs.openssh}/bin/ssh -i %d/id_ecdsa";
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RESTIC_PASSWORD_FILE = "%d/restic_password";
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};
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script = ''
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shopt -s nullglob
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# Read and deduplicate repos
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${if cfg.reposFile == null then "" else "readarray -t raw_repos < $CREDENTIALS_DIRECTORY/repos_file"}
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declare -A repos=(${builtins.concatStringsSep " " (builtins.map (x : "[${x}]=1") cfg.repos)})
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for repo in ''${raw_repos[@]}; do repos[$repo]=1; done
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# Clean up existing repos
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declare -A dirs
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for d in *; do
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origin=$(cd $d && ${pkgs.git}/bin/git remote get-url origin)
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if ! [ -n "''${repos[$origin]}" ]; then
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echo "$origin removed from config, cleaning up..."
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rm -rf $d
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else
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dirs[$origin]=$d
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fi
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done
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# Update repos
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EXIT_CODE=0
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for repo in "''${!repos[@]}"; do
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if [ -n "''${dirs[$repo]}" ]; then
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if ! (cd ''${dirs[$repo]} && ${pkgs.git}/bin/git remote update); then EXIT_CODE=1; fi
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else
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if ! (${pkgs.git}/bin/git clone --mirror $repo); then EXIT_CODE=1; fi
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fi
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done
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# Backup to Restic
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${pkgs.restic}/bin/restic \
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-r rest:http://restic.tywin.storage.ts.hillion.co.uk/128G \
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--cache-dir .restic --exclude .restic \
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backup .
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if test $EXIT_CODE -ne 0; then
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echo "Some repositories failed to clone!"
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exit $EXIT_CODE
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fi
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'';
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};
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systemd.timers.backup-git = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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Persistent = true;
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OnUnitInactiveSec = "15m";
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RandomizedDelaySec = "5m";
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Unit = "backup-git.service";
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};
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};
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};
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}
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