Automate retiring old branches

Change-Id: If6ea0e3b438d08cd0eeb1f49f30877ad76337238

eol_branch.sh

@@ -0,0 +1,154 @@
+#!/bin/bash
+
+function print_help {
+    echo ""
+    echo "USAGE:"
+    echo " ./eol_branch.sh [options] branch eol_tag project [project [project [...]]]"
+    echo ""
+    echo "A tool for retiring old branches. Performs the following:"
+    echo "1) Abandon stale reviews,"
+    echo "2) tag current position of branch"
+    echo "3) delete the branch from the remote"
+    echo ""
+    echo "Must be ran from a directory containing a recent checkout of the project[s]"
+    echo ""
+    echo "Options:"
+    echo " -d, --dry-run           Do not run any harmful commands"
+    echo " --eol-message <message> Set the message on the end-of-life tag"
+    echo " -h, --help              This help message"
+    echo " -q, --quiet             Turn off unimportant messages"
+    echo " --remote <remote>       Set the remote to delete branches from (default: gerrit)"
+    echo ""
+}
+
+OPTS=`getopt -o dhq --long eol-message:,dry,help,quiet,remote: -n $0 -- "$@"`
+if [ $? != 0 ] ; then
+    echo "Failed parsing options." >&2
+    print_help
+    exit 1
+fi
+eval set -- "$OPTS"
+set -e
+# Defaults:
+EOL_MESSAGE=""
+DEBUG=
+REMOTE=gerrit
+VERBOSE=true
+
+while true; do
+    case "$1" in
+        -d|--dry-run)
+            DEBUG=echo
+            shift
+            ;;
+        --eol-message)
+            EOL_MESSAGE=$2
+            shift
+            shift
+            ;;
+        -h|--help)
+            print_help
+            exit 0
+            ;;
+        -q|--quiet)
+            VERBOSE=false
+            shift
+            ;;
+        --remote)
+            REMOTE=$2
+            shift
+            shift
+            ;;
+        --)
+            shift
+            break
+            ;;
+    esac
+done
+
+# First argument is the branch to delete
+BRANCH=$1
+shift
+
+# Second argument is the tag to use before deletion
+TAG=$1
+shift
+
+if [$EOL_MESSAGE = ""]; then
+    EOL_MESSAGE="This branch ($BRANCH) is at End Of Life"
+fi
+
+
+function abandon_reviews {
+    project=$1
+    if [ $VERBOSE = true ]; then
+        echo "Running query: status:open project:$project branch:$BRANCH"
+    fi
+
+    gerrit_query="--current-patch-set status:open project:$project branch:$BRANCH"
+    ssh -p 29418 review.openstack.org gerrit query $gerrit_query |
+        grep revision | while read -r line; do
+        rev=`echo $line | cut -b 11-`
+        if [ $VERBOSE = true ]; then
+            echo "Found commit $rev to abandon"
+        fi
+        $DEBUG ssh -p 29418 review.openstack.org gerrit review --project $project --abandon --message '"$EOL_MESSAGE"' $rev
+    done
+}
+
+function tag_eol {
+    project=$1
+    rev=`git rev-parse remotes/$REMOTE/$BRANCH`
+
+    if git rev-parse $TAG >/dev/null 2>&1; then
+        echo "WARN: The tag ($TAG) already exists on $project"
+        tag_rev=`git rev-list -n 1 $TAG`
+        if [ $rev != $tag_rev ]; then
+            echo "ERROR: The tag ($tag_rev) doesn't match the branch ($rev)"
+            exit 1
+        fi
+        return 0
+    fi
+
+    if [ $VERBOSE = true ]; then
+        echo "About to add tag $TAG to $project at branch $BRANCH (rev $rev)"
+    fi
+    $DEBUG git tag -s $TAG -m "$EOL_MESSAGE" remotes/$REMOTE/$BRANCH
+    $DEBUG git push gerrit $TAG
+}
+
+function delete_branch {
+    rev=`git rev-parse remotes/$REMOTE/$BRANCH`
+    if [ $VERBOSE = true ]; then
+        echo "About to delete the branch $BRANCH from $project (rev $rev)"
+    fi
+    $DEBUG git push $REMOTE --delete $BRANCH
+}
+
+
+while (( "$#" )); do
+    project=$1
+    shift
+
+    if ! [ -d $project/.git ]; then
+        echo "$project is not a git repo"
+        echo "skipping..."
+        continue
+    fi
+
+    pushd $project
+    git remote update --prune
+
+    if ! git rev-parse remotes/$REMOTE/$BRANCH >/dev/null 2>&1; then
+        echo "$project does not have a branch $BRANCH"
+        echo "skipping..."
+        popd
+        continue
+    fi
+
+    abandon_reviews $project
+    tag_eol $project
+    delete_branch $project
+
+    popd
+done