# SPDX-FileCopyrightText: V <v@unfathomable.blue>
# SPDX-License-Identifier: OSL-3.0

{ lib, writeTextDir, writeText, buildEnv, writeTextFile, bash, writeScript }:

{ path
, branch ? "trunk"
, description ? "Unnamed repository; edit this file 'description' to name the repository."
, config ? {}
, hooks ? {}
, user ? "-", group ? "-"
}:

with lib;

let
  # As generated by an initial `git init --bare`
  defaultConfig = {
    core = {
      repositoryFormatVersion = 0;
      fileMode = true;
      bare = true;
    };
  };

  hooksDir = buildEnv {
    name = "git-repository-hooks";
    paths = mapAttrsToList (hook: scripts: writeTextFile {
      name = hook;
      text = ''
        #! ${bash}/bin/bash -e
      '' + concatMapStrings (script: ''
        ${script} "$@"
      '') scripts;
      destination = "/${hook}";
      executable = true;
    }) hooks;
  };
in writeTextDir "lib/tmpfiles.d/git-repository${replaceStrings [ "/" ] [ "-" ] path}.conf" ''
  # Root directory needs the correct permissions
  d ${path} - ${user} ${group}

  # This is the smallest set of paths that Git will still recognise as a valid repository.
  # Everything else will be automatically filled out after a push or pull.
  f+ ${path}/HEAD - ${user} ${group} - ref: refs/heads/${branch}
  d ${path}/objects - ${user} ${group}
  d ${path}/refs - ${user} ${group}

  # Extra stuff we want to use
  L+ ${path}/config - - - -  ${writeText "git-repository-config" (generators.toGitINI (recursiveUpdate defaultConfig config))}
  L+ ${path}/description - - - - ${builtins.toFile "git-repository-description" description}
  L+ ${path}/hooks - - - - ${hooksDir}
''