#!/usr/local/bin/zsh
# Run CI jobs for repositories on git.fmsbw.de.
# It can be scheduled as a cronjob.
# This requires Podman on FreeBSD.
#./ci.sh [<PROJECT> [<CI JOBS>]]
set -e

cd /var/git

projects=${1:-`echo *`}
for project in $projects; do
	test -d $project || continue
	cd $project

	# We are scheduled by a cronjob, so don't repeat builds that
	# have already been tried (whether successful or not).
	# We use a tag to keep track of this.
	# You can remove this tag to force a rebuild:
	# git push origin --delete master-fmsbw-ci
	branch=`git rev-parse --abbrev-ref HEAD`
	test "`git rev-parse -q --verify $branch-fmsbw-ci || true`" != "`git rev-parse $branch`" || continue

	# The runner can leave the website and other build artifacts there:
	htdocs="/var/www/htdocs/projects/$project"

	ci_scripts=${2:-`git ls-tree --name-only HEAD .fmsbw/`}
	for ci_script in $ci_scripts; do
		# Extract OCI image name by stripping any leading number used for sorting
		# FIXME: This will cause problems for fully qualified image names.
		# In practice, you need to prepare images to preinstall stuff anyway, so
		# short names will be sufficient.
		# If it turns out to be too inflexible, we could also extract the image name
		# from an `IMAGE: ...` comment in the file itself.
		ci_image="`basename $ci_script | sed 's/^[0-9]*\-//'`"

		# Would it make any sense to create a ZFS volume?
		working_copy="`mktemp -d /var/ci/working-copy.XXXX`"
		git clone --recurse-submodules . $working_copy

		mkdir -p "$htdocs"

		ci_log="/var/ci/$project:$branch-`basename $ci_script`.log"

		echo "[$project:$branch] Running $ci_script..."

		# NOTE: The operating system should be guessed.
		set +e
		podman run -t --rm -v $working_copy:/opt/build -v "$htdocs":/opt/htdocs \
		           -w /opt/build -e FMSBW_CI=1 "$ci_image" "$ci_script" 2>&1 >"$ci_log"
		rc=$?
		set -e
		if [ "$rc" != 0 ]; then
			echo "[$project:$branch] CI FAILED. See $ci_log"
			rm -rf $working_copy
			# The next ci_scripts in the series could depend on build artifacts,
			# so abort here.
			break
		fi

		rm -rf $working_copy
	done

	# Update the CI tag.
	# But avoid creating it for repos without any CI configured.
	test -z "`git ls-tree --name-only HEAD .fmsbw/`" || git tag -f $branch-fmsbw-ci $branch

	# Regenerate index.htmls
	generate-index-html -R "$htdocs/downloads" || true
	# Make sure the build artifacts are readable by httpd.
	chown -R www:www "$htdocs" || true

	cd ..
done