Tool for generating image release changes (#868)

* Tool for generating image release changes

* commit hash not needed for monthly

Author: eljog

build/prepare-release.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# This script is used to prepare a release of the dev containers.
+# It will bump the version of the manifest.json file and run the devcontainer upgrade command.
+# It will only run on the images that have been modified since the last release.
+# If no commit hash is provided, it will run in monthly release mode and bump the version of all images.
+# Example adhoc release: ./build/prepare-release.sh 1c6f558dc86aafd7749074ec44e238f331303517
+# Example monthly release: ./build/prepare-release.sh
+
+
+SCRIPT_SOURCE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+SRC_DIR=$(readlink -m $SCRIPT_SOURCE_DIR/../src)
+MANIFEST_FILE="manifest.json"
+COMMIT_HASH=$1
+
+get_modified_images() {
+	git diff --name-only --diff-filter=ACMRTUB ${COMMIT_HASH} HEAD ${SRC_DIR} | while read file; do
+		if [ ! -z $file ]; then
+			commitMessage=$(git log -1 $file)
+			# omit auto commits from bot
+			if [[ $commitMessage != *"Dev containers Bot"* ]]; then
+				# only get the top level directory for the image
+				if [ $(echo $file | tr "/" "\n" | wc -l) -eq 3 ]; then
+					readlink -m $(dirname $file)
+				fi
+			fi
+		fi
+	done | sort | uniq
+}
+
+get_all_images() {
+	find $SRC_DIR -maxdepth 1 -type d | tail -n +2 | sort | uniq
+}
+
+bump_version() {
+	directory=$1
+	manifestPath="$directory/$MANIFEST_FILE"
+	version=$(grep -oP '(?<="version": ")[^"]*' $manifestPath)
+	newVersion=$(echo $version | awk -F. -v OFS=. '{$NF += 1 ; print}')
+	sed -i "s/\"version\": \"$version\"/\"version\": \"$newVersion\"/g" $manifestPath
+}
+
+release_image() {
+	image=$1
+	echo "-----------------------------------------------"
+	echo "Releasing image $image"
+	echo "-----------------------------------------------"
+
+	bump_version $image
+	devcontainer upgrade --workspace-folder $image
+}
+
+adhoc_release() {
+    for image in $(get_modified_images); do
+        release_image $image
+    done
+}
+
+monthly_release() {
+    for image in $(get_all_images); do
+        release_image $image
+    done
+}
+
+main() {
+	if [ "$COMMIT_HASH" == "" ]; then
+		echo "No commit hash provided, running in monthly release mode"
+		monthly_release
+	else
+		adhoc_release
+	fi
+}
+
+main