#!/bin/sh

# SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
#
# SPDX-License-Identifier: AGPL-3.0-or-later

set -eu

base_path="$HOME/src"
repo="$QREXEC_SERVICE_ARGUMENT"
#origin="$QREXEC_REMOTE_DOMAIN"

die(){
  echo "error: $1" >&2
  exit 1
}

fail_invalid_name(){
  if ! (echo "$repo" | grep -q "^[A-Za-z0-9][A-Za-z0-9_.-]\+$"); then
    die "Invalid repository. Allowed chars: letters, numbers, hyphen, underscore and dot. It cannot begin with hyphen, underscore or dot."
  fi
}

if ! command -v git >/dev/null; then
  die "Command not found: git"
fi

fail_invalid_name
case "$repo" in
  *".git") ;;
  *) repo="$repo.git";;
esac

path="$base_path/$repo"
action="${0##*.Git}"

case "$action" in
  Fetch) service=git-upload-pack;;
  Push)  service=git-receive-pack;;
  Init)  service="git init --bare";;
  *) die "Invalid RPC name: ${0##*/}";;
esac

if test "$action" != "Init"; then
  test -d "$path" || die "Directory doesn't exist: $repo"
  git -C "$path" rev-parse >/dev/null 2>&1 || die "Not a git repository: $repo"
  is_bare="$(git -C "$path" rev-parse --is-bare-repository)"
  test "${is_bare}" = "true" || die "Not a bare repository: $repo"
fi

if ! test -d "$base_path"; then
  # shellcheck disable=SC2174
  mkdir -m 0700 -p "$base_path" >/dev/null 2>&1 ||
    die "Cannot create directory: $base_path"
fi

# shellcheck disable=SC2086
exec $service -- "$path"