code-server/scripts/cacher.sh

#!/usr/bin/env sh
# cacher.sh -- Restore and rebuild cache.
# Cache paths are designed to work with multi-arch builds and are organized
# based on the branch or tag. The master branch cache is used as a fallback.
# This will download and package the cache but it will not upload it.

set -eu

# Try restoring from each argument in turn until we get something.
restore() {
	for branch in "$@" ; do
		if [ -n "$branch" ] ; then
			cache_path="https://codesrv-ci.cdr.sh/cache/$branch/$tar.tar.gz"
			if wget "$cache_path" ; then
				tar xzvf "$tar.tar.gz"
				break
			fi
		fi
	done
}

# We need to cache the built-in extensions and Node modules. Everything inside
# the cache-upload directory will be uploaded as-is to the code-server bucket.
package() {
	mkdir -p "cache-upload/cache/$1"
	tar czfv "cache-upload/cache/$1/$tar.tar.gz" node_modules source yarn-cache
}

main() {
	cd "$(dirname "$0")/.."

	# Get the branch for this build.
	branch=${DRONE_BRANCH:-${DRONE_SOURCE_BRANCH:-${DRONE_TAG:-}}}

	# The cache will be named based on the arch, platform, and libc.
	arch=$DRONE_STAGE_ARCH
	platform=${PLATFORM:-linux}
	case $DRONE_STAGE_NAME in
		*alpine*) libc=musl  ;;
		*       ) libc=glibc ;;
	esac

	tar="$platform-$arch-$libc"

	# The action is determined by the name of the step.
	case $DRONE_STEP_NAME in
		*restore*) restore "$branch" "$DRONE_REPO_BRANCH" ;;
		*rebuild*|*package*) package "$branch" ;;
		*) exit 1 ;;
	esac
}

main "$@"