docker-versions-create init (#408)

docker-versions-create.sh

@@ -0,0 +1,71 @@
+#!/bin/bash
+#set -x
+# Use this variable to indicate a list of branches that docker hub is watching
+branches_list=('openj9' 'openj9-nightly')
+
+function TrapExit {
+  echo "Checking out back in master"
+  git checkout master
+}
+
+trap TrapExit EXIT SIGTERM
+
+test -d ./.git || { echo ".git folder was not found. Please start this script from root directory of the project!";
+  exit 1; }
+
+# Making sure we are in master
+git checkout master
+git pull --all || { echo "Can't pull the repo!"; \
+  exit 1; }
+
+git_branches=$(git branch -a)
+
+for branch in "${branches_list[@]}"; do
+  if [[ "$git_branches" != *"$branch"* ]]; then
+    echo "Can't update $branch because I can't find it in the list of branches."
+    exit 1
+  else
+    echo "Branch $branch found. Working with it."
+    git checkout "$branch" || { echo "Can't checkout into the branch. Don't know the cause."; \
+      exit 1; }
+    proceed='False'
+    while [[ "$proceed" == "False" ]]; do
+      if git merge master; then
+        proceed="True"
+        echo "Branch $branch updated to current master successfully"
+        # pushing changes to remote for this branch
+        git commit -m "Auto merge branch with master" -a
+        # push may fail if remote doesn't have this branch yet. In this case - sending branch
+        git push || git push -u origin "$branch" || { echo "Can't push changes to the origin."; exit 1; }
+      else
+        cat<<EOL
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+Master merge in the branch $branch encountered an error!
+You may try to fix the error and merge again. (Commit changes)
+Or skip this branch merge completely.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+EOL
+        printf "Should we try again? (y):"
+        read answer
+        if [[ "$answer" == '' ]] || [[ "$answer" == 'y' ]] || [[ "$answer" == 'Y' ]]; then
+          # If you use non-local editor or files are changed in repo
+          cat <<EOL
+
+The following commands may encounter an error!
+This is completely fine if the changes were made locally and remote branch doesn't know about them.
+
+EOL
+          # Updating branch from remote before trying again
+          git checkout master
+          git fetch --all
+          git pull -a
+          git checkout "$branch"
+          continue
+        else
+          break
+        fi
+      fi
+    done
+  fi
+
+done