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#!/bin/bash
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#Copyright 2021 The gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -euo pipefail
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ensure_command () {
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if command -v "$1" 1>/dev/null 2>&1; then
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return 0
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else
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echo "$1 is not installed. Please install it to proceed." 1>&2
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exit 1
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fi
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}
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display_usage () {
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cat << EOF >/dev/stderr
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USAGE: $0 PR_ID GITHUB_USER BACKPORT_BRANCHES REVIEWERS [-c PER_BACKPORT_COMMAND]
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PR_ID: The ID of the PR to be backported.
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GITHUB_USER: Your GitHub username.
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BACKPORT_BRANCHES: A space-separated list of branches to which the source PR will be backported.
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REVIEWERS: A comma-separated list of users to add as both reviewer and assignee.
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PER_BACKPORT_COMMAND : An optional command to run after cherrypicking the PR to the target branch.
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If you use this option, ensure your working directory is clean, as "git add -A" will be used to
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incorporate any generated files. Try running "git clean -xdff" beforehand.
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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"
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Example: $0 25493 gnossen "\$(seq 30 33 | xargs -n1 printf 'v1.%s.x ')" "menghanl" -c ./tools/dockerfile/push_testing_images.sh
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EOF
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exit 1
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}
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ensure_command "curl"
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ensure_command "egrep"
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ensure_command "hub"
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ensure_command "jq"
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if [ "$#" -lt "4" ]; then
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display_usage
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fi
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PR_ID="$1"
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GITHUB_USER="$2"
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BACKPORT_BRANCHES="$3"
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REVIEWERS="$4"
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shift 4
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PER_BACKPORT_COMMAND=""
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while getopts "c:" OPT; do
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case "$OPT" in
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c )
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PER_BACKPORT_COMMAND="$OPTARG"
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;;
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\? )
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echo "Invalid option: $OPTARG" >/dev/stderr
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display_usage
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;;
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: )
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echo "Invalid option: $OPTARG requires an argument." >/dev/stderr
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display_usage
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;;
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esac
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done
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if [[ ! -z "$(git status --porcelain)" && ! -z "$PER_BACKPORT_COMMAND" ]]; then
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echo "Your working directory is not clean. Try running `git clean -xdff`. Warning: This is irreversible." > /dev/stderr
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exit 1
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fi
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if [ -z "$GITHUB_TOKEN" ]; then
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echo "A GitHub token is required to run this script. See " \
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"https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token" \
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" for more information" >/dev/stderr
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exit 1
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fi
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echo "This script will create a collection of backport PRs. You will probably " \
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"have to touch your gnubby a frustrating number of times. C'est la vie."
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printf "Press any key to continue."
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read -r RESPONSE </dev/tty
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printf "\n"
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PR_DATA=$(curl -s -u "$GITHUB_USER:$GITHUB_TOKEN" \
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-H "Accept: application/vnd.github.v3+json" \
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"https://api.github.com/repos/grpc/grpc/pulls/$PR_ID")
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STATE=$(echo "$PR_DATA" | jq -r '.state')
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if [ "$STATE" != "open" ]; then
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TARGET_COMMITS=$(echo "$PR_DATA" | jq -r '.merge_commit_sha')
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FETCH_HEAD_REF=$(echo "$PR_DATA" | jq -r '.base.ref')
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SOURCE_REPO=$(echo "$PR_DATA" | jq -r '.base.repo.full_name')
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else
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COMMITS_URL=$(echo "$PR_DATA" | jq -r '.commits_url')
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COMMITS_DATA=$(curl -s -u "$GITHUB_USER:$GITHUB_TOKEN" \
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-H "Accept: application/vnd.github.v3+json" \
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"$COMMITS_URL")
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TARGET_COMMITS=$(echo "$COMMITS_DATA" | jq -r '. | map(.sha) | join(" ")')
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FETCH_HEAD_REF=$(echo "$PR_DATA" | jq -r '.head.sha')
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SOURCE_REPO=$(echo "$PR_DATA" | jq -r '.head.repo.full_name')
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fi
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PR_TITLE=$(echo "$PR_DATA" | jq -r '.title')
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PR_DESCRIPTION=$(echo "$PR_DATA" | jq -r '.body')
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LABELS=$(echo "$PR_DATA" | jq -r '.labels | map(.name) | join(",")')
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set -x
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git fetch "git@github.com:$SOURCE_REPO.git" "$FETCH_HEAD_REF"
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BACKPORT_PRS=""
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for BACKPORT_BRANCH in $BACKPORT_BRANCHES; do
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echo "Backporting $TARGET_COMMITS to $BACKPORT_BRANCH."
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git checkout "origin/$BACKPORT_BRANCH"
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BRANCH_NAME="backport_${PR_ID}_to_${BACKPORT_BRANCH}"
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# To make the script idempotent.
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git branch -D "$BRANCH_NAME" || true
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git checkout "$BACKPORT_BRANCH"
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git checkout -b "$BRANCH_NAME"
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for TARGET_COMMIT in $TARGET_COMMITS; do
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git cherry-pick -m 1 "$TARGET_COMMIT"
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done
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if [[ ! -z "$PER_BACKPORT_COMMAND" ]]; then
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git submodule update --init --recursive
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# To remove dangling submodules.
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git clean -xdff
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eval "$PER_BACKPORT_COMMAND"
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git add -A
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git commit --amend --no-edit
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fi
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BACKPORT_PR=$(hub pull-request -p -m "[Backport] $PR_TITLE" \
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-m "*Beep boop. This is an automatically generated backport of #${PR_ID}.*" \
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-m "$PR_DESCRIPTION" \
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-l "$LABELS" \
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-b "$GITHUB_USER:$BACKPORT_BRANCH" \
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-r "$REVIEWERS" \
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-a "$REVIEWERS" | tail -n 1)
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BACKPORT_PRS+="$BACKPORT_PR\n"
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# TODO: Turn on automerge once the Github API allows it.
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done
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printf "Your backport PRs have been created:\n$BACKPORT_PRS"
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