scripts: add update-modules helper (#2294)

Iterates over all configured modules and checks them for updates.

Makefile

@@ -100,6 +100,9 @@ refresh-patches: FORCE
 update-feeds: FORCE
 	@$(GLUON_ENV) scripts/feeds.sh
 
+update-modules: FORCE
+	@scripts/update-modules.sh
+
 update-ci: FORCE
 	@scripts/update-ci.sh
 

scripts/update-modules.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+
+# move to basedir, in case the script is not executed via `make update-modules`
+cd "$(dirname "$0")/.." || exit 1
+
+# shellcheck source=./modules
+source ./modules
+
+git diff --quiet ./modules || {
+	1>&2 echo "Your modules file is dirty, aborting."
+	exit 1
+}
+
+LOCAL_BRANCH=$(git branch --show-current)
+[[ $LOCAL_BRANCH != *-updates ]] && LOCAL_BRANCH+=-updates
+
+for MODULE in "OPENWRT" "PACKAGES_PACKAGES" "PACKAGES_ROUTING" "PACKAGES_GLUON"; do
+	_REMOTE_URL=${MODULE}_REPO
+	_REMOTE_BRANCH=${MODULE}_BRANCH
+	_LOCAL_HEAD=${MODULE}_COMMIT
+
+	REMOTE_URL="${!_REMOTE_URL}"
+	REMOTE_BRANCH="${!_REMOTE_BRANCH}"
+	LOCAL_HEAD="${!_LOCAL_HEAD}"
+
+	# get default branch name if none is set
+	[ -z "${REMOTE_BRANCH}" ] && {
+		REMOTE_BRANCH=$(git ls-remote --symref "${REMOTE_URL}" HEAD | awk '/^ref:/ { sub(/refs\/heads\//, "", $2); print $2 }')
+	}
+
+	# fetch the commit id for the HEAD of the module
+	REMOTE_HEAD=$(git ls-remote "${REMOTE_URL}" "${REMOTE_BRANCH}" | awk '{ print $1 }')
+
+	# skip ahead if the commit id did not change
+	[ "$LOCAL_HEAD" == "$REMOTE_HEAD" ] && continue 1
+
+	# switch to local working branch, if we found changes
+	[ "$(git branch --show-current)" != "${LOCAL_BRANCH}" ] && {
+		git switch -c "${LOCAL_BRANCH}" || git switch "${LOCAL_BRANCH}"
+	}
+
+	CHECKOUT=$(mktemp -d)
+
+	# clone the target branch
+	git clone --bare "${REMOTE_URL}" --branch="${REMOTE_BRANCH}" "${CHECKOUT}"
+
+	# prepare the commit message
+	# shellcheck disable=SC2001
+	MODULE=$(echo ${MODULE,,} | sed 's/packages_//')
+	TITLE="modules: update ${MODULE}"
+	MESSAGE="$(mktemp)"
+	{
+		echo "${TITLE}"
+		printf '\n\n'
+		git -C "${CHECKOUT}" log --oneline --no-decorate --no-merges "${LOCAL_HEAD}..${REMOTE_HEAD}" | cat
+	} > "$MESSAGE"
+
+	# modify modules file
+	sed -i "s/${LOCAL_HEAD}/${REMOTE_HEAD}/" ./modules
+	git add ./modules
+
+	git commit -F "${MESSAGE}"
+
+	# remove the checkout
+	rm -fr "${CHECKOUT}"
+done
+