nomadbsd-update.in

#!/bin/sh

. @PATH_CONFIG@

self_path="@SELF_PATH@"

bail()
{
	echo $* >&2
	exit 1
}

install_git()
{
	if ! which git >/dev/null; then
		pkg install -y "${git_pkg}" || bail "Failed to install ${git_pkg}"
	fi
}

_git()
{
	git $* || bail "git command failed"
}

git_pull()
{
	local repo_dir=$1
	
	(cd "${repo_dir}"; _git checkout ${main_branch}; _git pull)
}

get_last_local_commit()
{
	(cd "${repo_dir}" && \
		_git log -n 1 --pretty=format:%H origin/"${repo_branch}")
}

get_last_remote_commit()
{
	_git ls-remote -h "${repo_url}" | \
		grep "refs/heads/${repo_branch}" | cut -f 1
}

self_update_available()
{
	local local_commit remote_commit

	local_commit=$(get_last_local_commit)
	remote_commit=$(get_last_remote_commit)

	[ "${local_commit}" != "${remote_commit}" ]
}

install_self()
{
	(cd "${repo_dir}" && make install) || bail "Failed to install ${repo_name}"
}

update_self()
{
	install_git
	[ ! -d "${repo_dir}" ] && _git clone "${repo_url}" "${repo_dir}"
	if self_update_available; then
		git_pull "${repo_dir}"
		(cd "${repo_dir}" && _git checkout ${repo_branch})
		install_self "${repo_dir}"
	fi
}

#
# Make sure all components for the next stages are ready.
#
bootstrap()
{
	return 0
}

do_update()
{
	exit 0
}

usage()
{
	echo "Usage: $(basename $0) [options] command"
	echo "Options:"
	echo "-h       Show this message."
	echo ""
	echo "Commands:"
	echo "update   Run the update."
	exit 1
}

self_updated=0

while [ $# -gt 0 ]; do
	case "$1" in
	-_)
		self_updated=1
		;;
	-*)
		usage
		;;

	update)
		if [ ${self_updated} -ne 1 ]; then
			update_self
			exec ${self_path} -_ update
		fi
		bootstrap
		do_update
		;;
	*)
		usage
		;;
	esac
	shift
done

usage