Add backport script

pull/25472/head
Richard Belleville 4 years ago
parent 71d97f9600
commit d37beca576
  1. 90
      tools/release/backport_pr.sh

@ -0,0 +1,90 @@
#!/bin/bash
set -euo pipefail
ensure_command () {
if command -v "$1" 1>/dev/null 2>&1; then
return 0
else
echo "$1 is not installed. Please install it to proceed." 1>&2
exit 1
fi
}
ensure_command "curl"
ensure_command "egrep"
ensure_command "hub"
ensure_command "jq"
if [ -z "$GITHUB_TOKEN" ]; then
echo "A GitHub token is required to run this script. See " \
"https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token" \
" for more information" >/dev/stderr
exit 1
fi
if [ "$#" != "4" ]; then
echo "USAGE: $0 PR_NUMBER GITHUB_USER BACKPORT_BRANCHES REVIEWERS" >/dev/stderr
echo " PR_NUMBER: The number for the PR to be backported." >/dev/stderr
echo " GITHUB_USER: Your GitHub username." >/dev/stderr
echo " BACKPORT_BRANCHES: A space-separated list of branches to which to backport." >/dev/stderr
echo " REVIEWERS: A comma-separated list of users add as reviewers and assignees." >/dev/stderr
echo "" >/dev/stderr
echo "Example: $0 25456 gnossen \"v1.30.x v1.31.x v1.32.x v1.33.x v1.34.x v1.35.x v1.36.x\" \"menghanl,gnossen\""
exit 1
fi
echo "This script will create a collection of backport PRs. Make sure the PR to" \
" backport has already been merged. You will probably " \
" have to touch your gnubby a frustrating number of times. C'est la vie."
printf "Press any key to continue."
read -r RESPONSE </dev/tty
printf "\n"
PR_NUMBER="$1"
GITHUB_USER="$2"
BACKPORT_BRANCHES="$3"
REVIEWERS="$4"
PR_DATA=$(curl -s -u "$GITHUB_USER:$GITHUB_TOKEN" \
-H "Accept: application/vnd.github.v3+json" \
"https://api.github.com/repos/grpc/grpc/pulls/$PR_NUMBER")
MERGE_COMMIT=$(echo "$PR_DATA" | jq -r '.merge_commit_sha')
PR_TITLE=$(echo "$PR_DATA" | jq -r '.title')
PR_DESCRIPTION=$(echo "$PR_DATA" | jq -r '.body')
LABELS=$(echo "$PR_DATA" | jq -r '.labels | map(.name) | join(",")')
set -x
# git fetch origin
BACKPORT_PRS=""
for BACKPORT_BRANCH in $BACKPORT_BRANCHES; do
echo "Backporting $MERGE_COMMIT to $BACKPORT_BRANCH."
git checkout "origin/$BACKPORT_BRANCH"
BRANCH_NAME="backport_${PR_NUMBER}_to_${BACKPORT_BRANCH}"
# To make the script idempotent.
git branch -D "$BRANCH_NAME" || true
git checkout "$BACKPORT_BRANCH"
git checkout -b "$BRANCH_NAME"
git cherry-pick -m 1 "$MERGE_COMMIT"
BACKPORT_PR=$(hub pull-request -p -m "[Backport] $PR_TITLE" \
-m "*Beep boop. This is an automatically generated backport of #${PR_NUMBER}.*" \
-m "$PR_DESCRIPTION" \
-l "$LABELS" \
-b "$BACKPORT_BRANCH" \
-r "$REVIEWERS" \
-a "$REVIEWERS" | tail -n 1)
BACKPORT_PRS+="$BACKPORT_PR\n"
# TODO: Turn on automerge once the Github API allows it.
done
printf "Your backport PRs have been created:\n$BACKPORT_PRS"
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