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#!/bin/bash
#
# SPDX-License-Identifier: GPL-3.0-or-later

m4_include(lib/common.sh)

source /usr/share/makepkg/util/config.sh
source /usr/share/makepkg/util/message.sh

set -e


usage() {
    cat <<- _EOF_
		Usage: ${BASH_SOURCE[0]##*/} [COMMAND] [OPTIONS]

		Manage Git packaging repositories and helps with their configuration
		according to distro specs.

		Git author information and the used signing key is set up from
		makepkg.conf read from any valid location like /etc or XDG_CONFIG_HOME.
		The configure command can be used to synchronize the distro specs and
		makepkg.conf settings for previously cloned repositories.

		The unprivileged option can be used for cloning packaging repositories
		without SSH access using read-only HTTPS.

		COMMANDS
		    clone          Clone a package repository
		    configure      Configure a clone according to distro specs

		OPTIONS
		    -h, --help     Show this help text
_EOF_
}

usage_clone() {
    cat <<- _EOF_
		Usage: ${BASH_SOURCE[0]##*/} clone [OPTIONS] [PKGNAME...]

		Clone Git packaging repositories from the canonical namespace.

		The configure command is subsequently invoked to synchronize the distro
		specs and makepkg.conf settings. The unprivileged option can be used
		for cloning packaging repositories without SSH access using read-only
		HTTPS.

		OPTIONS
		    -u, --unprivileged     Clone package with read-only access and without
		                           packager info as Git author.
		    -h, --help             Show this help text
_EOF_
}

usage_configure() {
    cat <<- _EOF_
		Usage: ${BASH_SOURCE[0]##*/} configure [OPTIONS] [PATH...]

		Configure Git packaging repositories according to distro specs and
		makepkg.conf settings.

		Git author information and the used signing key is set up from
		makepkg.conf read from any valid location like /etc or XDG_CONFIG_HOME.
		The unprivileged option can be used for cloning packaging repositories
		without SSH access using read-only HTTPS.

		OPTIONS
		    -u, --unprivileged   Configure read-only repo without packager info as Git author.
		    -h, --help           Show this help text
_EOF_
}

if (( $# < 1 )); then
	usage
	exit 1
fi

# commands
CLONE=0
CONFIGURE=0

# options
GIT_REPO_BASE_URL=${GIT_PACKAGING_URL_SSH}
UNPRIVILEGED=0
MAINTAINER=
PACKAGER_NAME=
PACKAGER_EMAIL=

# command checking
while (( $# )); do
	case $1 in
		-h|--help)
			usage
			exit 0
			;;
		clone)
			CLONE=1
			CONFIGURE=1
			shift
			break
			;;
		configure)
			CONFIGURE=1
			shift
			break
			;;
		*)
			die "invalid argument: %s" "$1"
			;;
	esac
done

if (( CLONE )); then
	# option checking
	if (( $# < 1 )); then
		usage_clone
		exit 1
	fi
	while (( $# )); do
		case $1 in
			-h|--help)
				usage_clone
				exit 0
				;;
			-u|--unprivileged)
				GIT_REPO_BASE_URL=${GIT_PACKAGING_URL_HTTPS}
				UNPRIVILEGED=1
				shift
				;;
			--)
				shift
				break
				;;
			-*)
				die "invalid argument: %s" "$1"
				;;
			*)
				break
				;;
		esac
	done
elif (( CONFIGURE )); then
	# option checking
	if (( $# < 1 )); then
		usage_configure
		exit 1
	fi
	while (( $# )); do
		case $1 in
			-h|--help)
				usage_configure
				exit 0
				;;
			-u|--unprivileged)
				GIT_REPO_BASE_URL=${GIT_PACKAGING_URL_HTTPS}
				UNPRIVILEGED=1
				shift
				;;
			--)
				shift
				break
				;;
			-*)
				die "invalid argument: %s" "$1"
				;;
			*)
				break
				;;
		esac
	done
fi

# Load makepkg.conf variables to be available
load_makepkg_config

# Check official packaging identity before setting Git author
if (( ! UNPRIVILEGED )); then
	if [[ $PACKAGER == *"Unknown Packager"* ]]; then
		die "Packager must be set in makepkg.conf"
	fi
	packager_pattern="(.+) <(.+@.+)>"
	if [[ ! $PACKAGER =~ $packager_pattern ]]; then
		die "Invalid Packager format '${PACKAGER}' in makepkg.conf"
	fi

	PACKAGER_NAME=$(echo "${PACKAGER}"|sed -E "s/${packager_pattern}/\1/")
	PACKAGER_EMAIL=$(echo "${PACKAGER}"|sed -E "s/${packager_pattern}/\2/")

	if [[ ! $PACKAGER_EMAIL =~ .+@archlinux.org ]]; then
		die "Packager email '${PACKAGER_EMAIL}' is not an @archlinux.org address"
	fi
fi

pkgbases=("$@")
for pkgbase in "${pkgbases[@]}"; do
	if (( CLONE )); then
		if [[ ! -d ${pkgbase} ]]; then
			msg "Cloning ${pkgbase} ..."
			remote_url="${GIT_REPO_BASE_URL}/${pkgbase}.git"
			git clone --origin origin "${remote_url}"
		else
			warning "Skip cloning ${pkgbase}: Directory exists"
		fi
	fi

	if (( CONFIGURE )); then
		msg "Configuring $(basename "${pkgbase}") ..."
		path=${pkgbase}
		if [[ ! -d "${path}/.git" ]]; then
			error "Not a Git repository: ${path}"
			continue
		fi

		giturl=$(git -C "${path}" remote get-url origin)
		if [[ ${giturl} != *${GIT_PACKAGING_NAMESPACE}* ]]; then
			error "Not a packaging repository: ${path}"
			continue
		fi

		pkgbase=$(basename "${giturl}")
		pkgbase=${pkgbase%.git}
		remote_url="${GIT_REPO_BASE_URL}/${pkgbase}.git"

		git -C "${path}" remote set-url origin "${remote_url}"
		git -C "${path}" config devtools.version "${GIT_REPO_SPEC_VERSION}"
		git -C "${path}" config commit.gpgsign true
		git -C "${path}" config pull.rebase true
		git -C "${path}" config branch.main.rebase true

		if (( ! UNPRIVILEGED )); then
			git -C "${path}" config user.name "${PACKAGER_NAME}"
			git -C "${path}" config user.email "${PACKAGER_EMAIL}"
			if [[ -n $GPGKEY ]]; then
				git -C "${path}" config user.signingKey "${GPGKEY}"
			fi
		fi
	fi
done