From f0b47d02c8a6634f00961136c2d18db4cd4c8f81 Mon Sep 17 00:00:00 2001
From: Mario Rodriguez Molins <mario.rodriguez@elastic.co>
Date: Wed, 6 Mar 2024 18:57:36 +0100
Subject: [PATCH] Check whether or not jenkins folder exists in backport
 branches (#9280)

Add safeguards when running backport branches pipeline, to avoid
errors if ".ci" (jenkins folder) does not exist or if there are no changes
in the stage.
---
 .buildkite/scripts/backport_branch.sh | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/.buildkite/scripts/backport_branch.sh b/.buildkite/scripts/backport_branch.sh
index 4481c1cd325..20fd31c3d2c 100755
--- a/.buildkite/scripts/backport_branch.sh
+++ b/.buildkite/scripts/backport_branch.sh
@@ -84,6 +84,7 @@ removeOtherPackages() {
 updateBackportBranchContents() {
   local BUILDKITE_FOLDER_PATH=".buildkite"
   local JENKINS_FOLDER_PATH=".ci"
+  local files_cached_num=""
   if git ls-tree -d --name-only main:.ci >/dev/null 2>&1; then
     git checkout $BACKPORT_BRANCH_NAME
     echo "Copying $BUILDKITE_FOLDER_PATH from $SOURCE_BRANCH..."
@@ -108,15 +109,26 @@ updateBackportBranchContents() {
   git config --global user.name "${GITHUB_USERNAME_SECRET}"
   git config --global user.email "${GITHUB_EMAIL_SECRET}"
 
+  echo "Commiting"
+  git add $BUILDKITE_FOLDER_PATH
+  if [ -d "${JENKINS_FOLDER_PATH}" ]; then
+    git add $JENKINS_FOLDER_PATH
+  fi
+  git add $PACKAGES_FOLDER_PATH/
+  git status
+
+  files_cached_num=$(git diff --name-only --cached | wc -l)
+  if [ "${files_cached_num}" -gt 0 ]; then
+    git commit -m "Add $BUILDKITE_FOLDER_PATH and $JENKINS_FOLDER_PATH to backport branch: $BACKPORT_BRANCH_NAME from the $SOURCE_BRANCH branch"
+  else
+    echo "Nothing to commit, skip."
+  fi
+
   if [ "$DRY_RUN" == "true" ];then
     echo "DRY_RUN mode, nothing will be pushed."
     git diff $SOURCE_BRANCH...$BACKPORT_BRANCH_NAME
   else
-    echo "Commiting and pushing..."
-    git add $BUILDKITE_FOLDER_PATH
-    git add $JENKINS_FOLDER_PATH
-    git add $PACKAGES_FOLDER_PATH/
-    git commit -m "Add $BUILDKITE_FOLDER_PATH and $JENKINS_FOLDER_PATH to backport branch: $BACKPORT_BRANCH_NAME from the $SOURCE_BRANCH branch"
+    echo "Pushing..."
     git push origin $BACKPORT_BRANCH_NAME
   fi
 }
@@ -172,4 +184,7 @@ MSG="The backport branch: **$BACKPORT_BRANCH_NAME** has been created."
 echo "Adding CI files into the branch ${BACKPORT_BRANCH_NAME}"
 updateBackportBranchContents
 
+if [ "${DRY_RUN}" == "true" ]; then
+  MSG="[DRY_RUN] ${MSG}."
+fi
 buildkite-agent annotate "$MSG" --style "success"