Polish "Automate Docker update in CI"

See gh-20530

ci/scripts/create-pull-request.sh

@@ -1,11 +1,17 @@
 #!/bin/bash
 set -e
 
-curl \
-  -s \
-	-u ${GITHUB_USERNAME}:${GITHUB_PASSWORD} \
-	-H "Content-type:application/json" \
-	-d "{\"head\":\"${BRANCH}\",\"base\":\"${BASE_BRANCH}\",\"title\":\"${ISSUE_TITLE}\",\"body\":\"\",\"labels\":[\"status: waiting-for-triage\",\"type: task\"]}"  \
-	-f \
-	-X \
-	POST "https://api.github.com/repos/${GITHUB_ORGANIZATION}/${GITHUB_REPO}/pulls" > /dev/null || { echo "Failed to create pull request" >&2; exit 1; }
+commit_message=$( cat commit-details/message )
+
+if [[ ${commit_message} != "" ]]; then
+	curl \
+	  -s \
+		-u ${GITHUB_USERNAME}:${GITHUB_PASSWORD} \
+		-H "Content-type:application/json" \
+		-d "{\"head\":\"${BRANCH}\",\"base\":\"${BASE_BRANCH}\",\"title\":\"${ISSUE_TITLE}\",\"body\":\"\",\"labels\":[\"status: waiting-for-triage\",\"type: task\"]}"  \
+		-f \
+		-X \
+		POST "https://api.github.com/repos/${GITHUB_ORGANIZATION}/${GITHUB_REPO}/pulls" > /dev/null || { echo "Failed to create pull request" >&2; exit 1; }
+else
+	echo "Already up-to-date"
+fi

ci/scripts/detect-docker-updates.sh

@@ -18,20 +18,17 @@ fi
 existing_tasks=$( curl -s https://api.github.com/repos/${GITHUB_ORGANIZATION}/${GITHUB_REPO}/pulls\?labels\=type:%20task\&state\=open\&creator\=spring-buildmaster )
 existing_upgrade_issues=$( echo "$existing_tasks" | jq -c --arg TITLE "$ISSUE_TITLE" '.[] | select(.title==$TITLE)' )
 
+git clone git-repo git-repo-updated > /dev/null
+
 if [[ ${existing_upgrade_issues} = "" ]]; then
-	pushd git-repo > /dev/null
-	popd > /dev/null
-	git clone git-repo docker-updates-git-repo > /dev/null
-	pushd docker-updates-git-repo > /dev/null
-	# Create changes in dedicated branch
-	branch="ci-docker-$latest_version"
+	pushd git-repo-updated > /dev/null
 	git config user.name "Spring Buildmaster" > /dev/null
 	git config user.email "buildmaster@springframework.org" > /dev/null
-	git checkout -b "$branch" origin/master > /dev/null
 	sed -i "s/version=.*/version=\"$latest_version\"/" ci/images/get-docker-url.sh
 	git add ci/images/get-docker-url.sh > /dev/null
 	commit_message="Upgrade to Docker $latest_version in CI"
 	git commit -m "$commit_message" > /dev/null
+	echo ${commit_message} > commit-details/message
 else
 	echo "Pull request already exists."
 fi