Script for merging changes from a bugfix branch into master (#11299)

* Supports "Merge: no" for changesets which should be skipped, e.g. release notes updates.
* Supports "Merge: manual" which will causes the merge to stop, requiring somebody to manually merge to change before continuing

Change-Id: If5d1291ec77f4c1e31b3afb8420a45ecceedfa15

1 files changed, 104 insertions, 0 deletions

diff --git a/scripts/automerge7.sh b/scripts/automerge7.sh
new file mode 100755
index 0000000000..8f8ed9a785
--- /dev/null
+++ b/scripts/automerge7.sh
@@ -0,0 +1,104 @@
+#!/bin/bash
+
+FROM=origin/7.0
+TO=master
+PUSH="origin HEAD:refs/for/master"
+
+show() {
+        sCommit=$1
+        if [ "$sCommit" == "" ]
+        then
+                echo "show() missing commit id"
+                exit 1
+        fi
+        git show -s  $sCommit
+}
+merge() {
+        mCommit=$1
+        if [ "$mCommit" == "" ]
+        then
+                echo "merge() missing commit id"
+                exit 1
+        fi
+
+#       echo "merge($mCommit)"
+
+        git merge $mCommit $2
+        if [ "$?" != "0" ]
+        then
+                echo "Merge failed for commit $mCommit"
+                echo "Manual merge is needed"
+                exit 2
+        fi
+        # Add a change id using git hook
+        git commit --amend --no-edit
+
+}
+
+pushMerged() {
+#       echo "pushMerged()"
+        git push $PUSH
+        if [ "$?" != "0" ]
+        then
+                echo "Push failed!"
+                exit 2
+        fi
+}
+
+maybe_commit_and_push() {
+#       echo "maybe_commit_and_push()"
+        cpCommit=$1
+        if [ "$cpCommit" == "" ]
+        then
+                # Nothing to merge currently
+                return
+        fi
+#       echo "maybe_commit_and_push: Merging $cpCommit"
+        merge $cpCommit
+        pushMerged
+}
+
+git checkout $TO
+git pull --rebase
+
+pending=`git log $TO..$FROM --reverse|grep "^commit "|sed "s/commit //"`
+
+pendingCommit=
+for commit in $pending
+do
+        echo "Checking $commit..."
+        mergeDirective=`git log -n 1 --format=%B $commit|grep "^Merge:"|sed "s/Merge: //"`
+        if [ "$mergeDirective" == "" ]
+        then
+                pendingCommit=$commit
+        elif [ "$mergeDirective" == "no" ]
+        then
+                maybe_commit_and_push $pendingCommit
+                pendingCommit=
+                echo
+                echo "Doing a no-op merge for $commit because of Merge: no"
+                # Do a no-op merge
+                git merge $commit -s ours
+                pushMerged
+        elif [ "$mergeDirective" == "manual" ]
+        then
+                maybe_commit_and_push $pendingCommit
+                pendingCommit=
+                echo
+                echo "Stopping merge at $commit (merge: manual)"
+                echo "The following commit must be manually merged."
+                show $commit
+                exit 3
+        else
+                maybe_commit_and_push $pendingCommit
+                pendingCommit=
+                echo
+                echo "Commit $commit contains an unknown merge directive, Merge: $mergeDirective"
+                echo "Stopping merge."
+                show $commit
+                exit 3
+        fi
+done
+
+# Push any pending merges
+maybe_commit_and_push $pendingCommit