Custom backport script for grpc-java

backport.sh

#!/bin/bash
# Copyright 2020 The gRPC Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -e

if [[ $# < 2 ]]; then
  echo "Usage: $0 PR MINOR_VERSIONS"
  exit 1
fi

readonly pr="$1"
readonly minors="$2"
readonly repo="$(git remote get-url origin | sed -E 's#.*[:/]([a-zA-Z0-9-]+)/grpc-java.*#\1#')"

readonly pr_metadata="$(curl -sSf -H "Accept: application/vnd.github.v3+json" "https://api.github.com/repos/grpc/grpc-java/pulls/$pr")"
readonly assignee="$(echo "$pr_metadata" | jq -r '.assignee.login')"
readonly commits="$(echo "$pr_metadata" | jq -r '.merge_commit_sha')"
readonly branch_id="$(echo "$pr_metadata" | jq -r '.head.ref')"
readonly title="$(echo "$pr_metadata" | jq -r '.title')"
readonly body="$(echo "$pr_metadata" | jq -r '.body')"

cat <<EOT
PR: https://github.com/grpc/grpc-java/pull/$pr
Versions: $minors
Assignee: $assignee
Commits: $commits
Branch id: $branch_id
Repo: $repo
EOT

read -p "Continue? "

urlencode() {
  python3 -c "import urllib.parse, sys; print(urllib.parse.quote(sys.argv[1]))" "$*"
}

git fetch upstream
readonly orig_branch="$(git rev-parse --abbrev-ref HEAD)"
#readonly title="$(git log -1 --pretty=format:%s "$commit")"
#readonly body="$(git log -1 --pretty=format:%b "$commit")"
for minor in $minors; do
  git checkout -b "backport-${branch_id}-1.$minor" "upstream/v1.$minor.x"
  git cherry-pick $commits
  git push --set-upstream origin "backport-${branch_id}-1.$minor"
  echo
  echo
  echo ------------------------------------------------------
  echo "https://github.com/grpc/grpc-java/compare/v1.$minor.x...$repo:backport-${branch_id}-1.$minor?expand=1&assignees=$assignee&title=$(urlencode "$title")%20%281.$minor.x%20backport%29&body=$(urlencode "$body")%0A%0ABackport%20of%20%23$pr"
  echo ------------------------------------------------------
  echo
  echo
done
git checkout "$orig_branch"