refactor(nixos/{nginx, nix-sync}): Migrate from `system/services`

Nix-sync was sort-of mixed into the nginx configuration, thus separating
it completely seemed reasonable.

1 files changed, 0 insertions, 299 deletions

diff --git a/system/services/nix-sync/default.nix b/system/services/nix-sync/default.nix
deleted file mode 100644
index a3ab0af..0000000
--- a/system/services/nix-sync/default.nix
+++ /dev/null
@@ -1,299 +0,0 @@
-{
-  config,
-  lib,
-  pkgs,
-  ...
-}: let
-  cfg = config.services.nix-sync;
-  esa = lib.strings.escapeShellArg;
-
-  mkTimer = name: repo: {
-    description = "Nix sync ${name} timer";
-    wantedBy = ["timers.target"];
-    timerConfig = {
-      OnUnitActiveSec = repo.interval;
-    };
-    wants = ["network-online.target"];
-    after = ["network-online.target"];
-  };
-
-  parents = path: let
-    split_path = builtins.split "/" path;
-    filename = builtins.elemAt split_path (builtins.length split_path - 1);
-    path_build =
-      lib.strings.removeSuffix "/" (builtins.replaceStrings [filename] [""] path);
-    final_path =
-      if filename == ""
-      then parents path_build
-      else path_build;
-  in
-    final_path;
-
-  mkUnit = name: repo: let
-    optionalPathSeparator =
-      if lib.strings.hasPrefix "/" repo.path
-      then ""
-      else "/";
-    /*
-    * `ln` tries to create a symlink in the directory, if the target ends with a '/',
-    * thus remove it.
-    */
-    repoPath = lib.strings.removeSuffix "/" repo.path;
-
-    repoCachePath = cfg.cachePath + optionalPathSeparator + repo.path;
-    execStartScript = pkgs.writeScript "nix-sync-exec" ''
-      #! /usr/bin/env dash
-      export XDG_CACHE_HOME="$CACHE_DIRECTORY";
-      cd ${esa repoCachePath};
-
-      git fetch
-      origin="$(git rev-parse @{u})";
-      branch="$(git rev-parse @)";
-
-      if ! [ "$origin" = "$branch" ]; then
-        git pull --rebase;
-
-        out_paths=$(mktemp);
-        nix build . --print-out-paths --experimental-features 'nix-command flakes' > "$out_paths";
-        [ "$(wc -l < "$out_paths")" -gt 1 ] && (echo "To many out-paths"; exit 1)
-        out_path="$(cat "$out_paths")";
-        rm ${esa repoPath};
-        ln -s "$out_path" ${esa repoPath};
-        rm "$out_paths";
-      fi
-    '';
-    execStartPreScript = ''
-      export XDG_CACHE_HOME="$CACHE_DIRECTORY";
-
-      if ! [ -d ${esa repoCachePath}/.git ]; then
-          mkdir --parents ${esa repoCachePath};
-          git clone ${esa repo.uri} ${esa repoCachePath};
-
-          out_paths=$(mktemp);
-          nix build ${esa repoCachePath} --print-out-paths --experimental-features 'nix-command flakes' > "$out_paths";
-          [ "$(wc -l < "$out_paths")" -gt 1 ] && (echo "To many out-paths"; exit 1)
-          out_path="$(cat "$out_paths")";
-          ln -s "$out_path" ${esa repoPath};
-          rm "$out_paths";
-      fi
-
-      if ! [ -L ${esa repoPath} ]; then
-        cd ${esa repoCachePath};
-
-        git pull --rebase;
-
-        out_paths=$(mktemp);
-        nix build . --print-out-paths --experimental-features 'nix-command flakes' > "$out_paths";
-        [ "$(wc -l < "$out_paths")" -gt 1 ] && { echo "To many out-paths"; exit 1; }
-        out_path="$(cat "$out_paths")";
-
-        if [ -d ${esa repoPath} ]; then
-          rm -d ${esa repoPath};
-        else
-          mkdir --parents "$(dirname ${esa repoPath})";
-        fi
-        [ -e ${esa repoPath} ] && rm ${esa repoPath};
-
-        ln -s "$out_path" ${esa repoPath};
-        rm "$out_paths";
-      fi
-    '';
-  in {
-    description = "Nix Sync ${name}";
-    wantedBy = ["default.target"];
-    after = ["network.target"];
-    path = with pkgs; [openssh git nix mktemp coreutils dash];
-    preStart = execStartPreScript;
-
-    serviceConfig = {
-      TimeoutSec = 0;
-      ExecStart = execStartScript;
-      Restart = "on-abort";
-      # User and group
-      User = cfg.user;
-      Group = cfg.group;
-      # Runtime directory and mode
-      RuntimeDirectory = "nix-sync";
-      RuntimeDirectoryMode = "0750";
-      # Cache directory and mode
-      CacheDirectory = "nix-sync";
-      CacheDirectoryMode = "0750";
-      # Logs directory and mode
-      LogsDirectory = "nix-sync";
-      LogsDirectoryMode = "0750";
-      # Proc filesystem
-      ProcSubset = "all";
-      ProtectProc = "invisible";
-      # New file permissions
-      UMask = "0027"; # 0640 / 0750
-      # Capabilities
-      AmbientCapabilities = ["CAP_CHOWN"];
-      CapabilityBoundingSet = ["CAP_CHOWN"];
-      # Security
-      NoNewPrivileges = true;
-      # Sandboxing (sorted by occurrence in https://www.freedesktop.org/software/systemd/man/systemd.exec.html)
-      ReadWritePaths = ["${esa (parents repo.path)}" "-${esa (parents repoCachePath)}" "-${esa cfg.cachePath}"];
-      ReadOnlyPaths = ["/nix"]; # TODO: Should be irrelevant, as we have ProtectSystem=Strict <2024-06-01>
-      ProtectSystem = "strict";
-      ProtectHome = true;
-      PrivateTmp = true;
-      PrivateDevices = true;
-      ProtectHostname = true;
-      ProtectClock = true;
-      ProtectKernelTunables = true;
-      ProtectKernelModules = true;
-      ProtectKernelLogs = true;
-      ProtectControlGroups = true;
-      RestrictAddressFamilies = ["AF_UNIX" "AF_INET" "AF_INET6"];
-      RestrictNamespaces = true;
-      LockPersonality = true;
-      MemoryDenyWriteExecute = true;
-      RestrictRealtime = true;
-      RestrictSUIDSGID = true;
-      RemoveIPC = true;
-      PrivateMounts = true;
-      # System Call Filtering
-      SystemCallArchitectures = "native";
-      SystemCallFilter = ["~@cpu-emulation @debug @keyring @mount @obsolete @privileged @setuid"];
-    };
-  };
-
-  services =
-    lib.mapAttrs' (name: repo: {
-      name = "nix-sync-${name}";
-      value = mkUnit name repo;
-    })
-    cfg.repositories;
-  timers =
-    lib.mapAttrs' (name: repo: {
-      name = "nix-sync-${name}";
-      value = mkTimer name repo;
-    })
-    cfg.repositories;
-
-  # generate the websites directory, so systemd can mount it read write
-  generatedDirectories =
-    lib.mapAttrsToList (
-      _: repo: "d ${esa (parents repo.path)} 0755 ${cfg.user} ${cfg.group}"
-    )
-    cfg.repositories;
-
-  repositoryType = lib.types.submodule ({name, ...}: {
-    options = {
-      name = lib.mkOption {
-        internal = true;
-        default = name;
-        type = lib.types.str;
-        description = "The name that should be given to this unit.";
-      };
-
-      path = lib.mkOption {
-        type = lib.types.str;
-        description = "The path at which to sync the repository";
-      };
-
-      uri = lib.mkOption {
-        type = lib.types.str;
-        example = "ssh://user@example.com:/~[user]/path/to/repo.git";
-        description = ''
-          The URI of the remote to be synchronized. This is only used in the
-          event that the directory does not already exist. See
-          <link xlink:href="https://git-scm.com/docs/git-clone#_git_urls"/>
-          for the supported URIs.
-        '';
-      };
-
-      extraSettings = lib.mkOption {
-        type = lib.types.attrsOf lib.types.anything;
-        example = lib.literalExpression ''
-          {
-            locations."/.well-known/openpgpkey/hu/" = {
-              extraConfig = \'\'
-                  default_type application/octet-stream;
-
-                  add_header Access-Control-Allow-Origin * always;
-                \'\';
-            };
-          }
-        '';
-        description = ''
-          Extra config to add the the nginx virtual host.
-        '';
-      };
-
-      interval = lib.mkOption {
-        type = lib.types.int;
-        default = 500;
-        description = ''
-          The interval, specified in seconds, at which the synchronization will
-          be triggered.
-        '';
-      };
-    };
-  });
-in {
-  options = {
-    services.nix-sync = {
-      enable = lib.mkEnableOption "nix-sync services";
-
-      user = lib.mkOption {
-        type = lib.types.str;
-        default = "nix-sync";
-        description = lib.mdDoc "User account under which nix-sync units runs.";
-      };
-
-      group = lib.mkOption {
-        type = lib.types.str;
-        default = "nix-sync";
-        description = lib.mdDoc "Group account under which nix-sync units runs.";
-      };
-
-      cachePath = lib.mkOption {
-        type = lib.types.str;
-        default = "/var/lib/nix-sync";
-        description = lib.mdDoc ''
-          Where to cache git directories. Should not end with a slash ("/")
-        '';
-      };
-
-      repositories = lib.mkOption {
-        type = with lib.types; attrsOf repositoryType;
-        description = ''
-          The repositories that should be synchronized.
-        '';
-      };
-    };
-  };
-
-  config = lib.mkIf cfg.enable {
-    assertions = [
-      {
-        assertion = !lib.strings.hasSuffix "/" cfg.cachePath;
-        message = "Your cachePath ('${cfg.cachePath}') ends with a slash ('/'), please use: '${lib.strings.removeSuffix "/" cfg.cachePath}'.";
-      }
-    ];
-    systemd = {
-      tmpfiles.rules =
-        generatedDirectories;
-
-      inherit services timers;
-    };
-    users.users =
-      if cfg.user == "nix-sync"
-      then {
-        nix-sync = {
-          group = "${cfg.group}";
-          isSystemUser = true;
-        };
-      }
-      else lib.warnIf (cfg.user != "nix-sync") "The user (${cfg.user}) is not \"nix-sync\", thus you are responible for generating it.";
-    users.groups =
-      if cfg.group == "nix-sync"
-      then {
-        nix-sync = {
-          members = ["${cfg.user}"];
-        };
-      }
-      else lib.warnIf (cfg.group != "nix-sync") "The group (${cfg.group}) is not \"nix-sync\", thus you are responible for generating it.";
-  };
-}