149 lines
4.1 KiB
Nix
149 lines
4.1 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.system.permown;
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in
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{
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options.system.permown = mkOption {
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default = { };
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type = with types;
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attrsOf (submodule ({ config, ... }: {
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options = {
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directory-mode = mkOption {
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default = "=rwx";
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type = types.str;
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};
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file-mode = mkOption {
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default = "=rw";
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type = types.str;
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};
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group = mkOption {
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apply = x: if x == null then "" else x;
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default = null;
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type = types.nullOr types.str;
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};
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keepGoing = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Whether to keep going when chowning or chmodding fails.
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If set to false, then errors will cause the service to restart
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instead.
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'';
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};
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owner = mkOption { type = types.str; };
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path = mkOption {
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default = config._module.args.name;
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type = types.path;
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};
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umask = mkOption {
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default = "0027";
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type = types.str;
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};
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timer = mkOption {
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default = "hourly";
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type = types.str;
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description =
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"OnCalendar string on how frequent should this command run";
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};
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};
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}));
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};
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config =
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let
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plans = attrValues cfg;
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in
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mkIf (plans != [ ]) {
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system.activationScripts.permown =
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let
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mkdir = { path, ... }: ''
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${pkgs.coreutils}/bin/mkdir -p "${path}"
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'';
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in
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concatMapStrings mkdir plans;
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systemd.services =
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let
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nameGenerator = { path, ... }:
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"permown.${replaceStrings [ "/" ] [ "_" ] path}";
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serviceDefinition =
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{ path, directory-mode, file-mode, owner, group, umask, keepGoing, ... }:
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{
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environment = {
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DIR_MODE = directory-mode;
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FILE_MODE = file-mode;
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OWNER_GROUP = "${owner}:${group}";
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ROOT_PATH = path;
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};
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path = [
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pkgs.coreutils
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pkgs.findutils
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pkgs.inotifyTools
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];
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serviceConfig = {
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ExecStart =
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let
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continuable = command:
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if keepGoing
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then "{ ${command}; } || :"
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else command;
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in
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pkgs.writers.writeDash "permown" ''
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set -efu
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find "$ROOT_PATH" -exec chown -h "$OWNER_GROUP" {} +
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find "$ROOT_PATH" -type d -exec chmod "$DIR_MODE" {} +
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find "$ROOT_PATH" -type f -exec chmod "$FILE_MODE" {} +
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paths=/tmp/paths
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rm -f "$paths"
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mkfifo "$paths"
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inotifywait -mrq -e CREATE --format %w%f "$ROOT_PATH" > "$paths" &
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inotifywaitpid=$!
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trap cleanup EXIT
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cleanup() {
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kill "$inotifywaitpid"
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}
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while read -r path
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do
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if test -d "$path"; then
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cleanup
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exec "$0" "$@"
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fi
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${continuable ''chown -h "$OWNER_GROUP" "$path"''}
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if test -f "$path"; then
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${continuable ''chmod "$FILE_MODE" "$path"''}
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fi
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done < "$paths"
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'';
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PrivateTmp = true;
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Restart = "always";
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RestartSec = 10;
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UMask = umask;
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};
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wantedBy = [ "multi-user.target" ];
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};
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in
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listToAttrs (map
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(plan:
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{
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name = nameGenerator plan;
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value = serviceDefinition plan;
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})
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plans);
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};
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}
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