add a script to build zuul commands to reenqueue jobs

This script only generates the commands as a convenience, we still
need someone with infra-root privileges to run them.

Change-Id: I9870230509ad9f532f486b0682786d136ded798a
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

tools/build_reenqueue_commands.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+#
+# Script to produce the zuul commands for reenqueuing a release if the
+# jobs fail part way through. This command assumes that the tag has
+# been applied to the repository already. If that is not true, we can
+# revert and re-land the patch in openstack/releases.
+
+if [[ $# -lt 2 ]]; then
+    echo "Usage: $(basename $0) <repo> <tag>"
+    echo "repo should be e.g. openstack/glance"
+    exit 1
+fi
+
+repo="$1"
+tag="$2"
+
+TOOLSDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+BASEDIR=$(dirname $TOOLSDIR)
+source $TOOLSDIR/functions
+
+setup_temp_space 'build-reenqueue-commands'
+
+clone_repo $repo
+
+hash=$(cd $repo && git show-ref -s $tag)
+
+pipelines="tag"
+
+if [[ $tag =~ (a|b|rc) ]]; then
+    pipelines="$pipelines pre-release"
+else
+    pipelines="$pipelines release"
+fi
+
+for pipeline in $pipelines; do
+    echo "zuul enqueue-ref --tenant=openstack --trigger=gerrit --pipeline=$pipeline --project=$repo --ref=refs/tags/$tag --newrev=$hash"
+done