mirror of
https://gitlab.isc.org/isc-projects/bind9
synced 2025-08-22 18:19:42 +00:00
4cb8b13987
All changes in this commit were automated using the command: shfmt -w -i 2 -ci -bn . $(find . -name "*.sh.in") By default, only *.sh and files without extension are checked, so *.sh.in files have to be added additionally. (See mvdan/sh#944)
266 lines
6.9 KiB
Bash
Executable File
266 lines
6.9 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# SPDX-License-Identifier: MPL-2.0
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at https://mozilla.org/MPL/2.0/.
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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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set -e
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SELF="$(basename $0)"
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SELF="${SELF/-/ }"
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STATE_FILE=".git/REPLAY_MERGE"
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DONT_TAG=${DONT_TAG:=false}
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DONT_PUSH=${DONT_PUSH:=false}
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DONT_ACCEPT=${DONT_ACCEPT:=false}
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die() {
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for MESSAGE in "$@"; do
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echo -e "${MESSAGE}" >&2
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done
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exit 1
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}
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die_with_usage() {
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die "Usage:" \
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"" \
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"${SELF} [options] <merge_commit_id> <target_remote> <target_branch>" \
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"${SELF} --continue" \
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"${SELF} --abort" \
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"" \
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"options:" \
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" --no-push" \
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" --no-tag" \
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""
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}
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die_with_continue_instructions() {
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die "" \
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"Replay interrupted. Conflicts need to be fixed manually." \
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"When done, run \"${SELF} --continue\"." \
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"Use \"${SELF} --abort\" to abort the replay."
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}
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die_before_push() {
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die "" \
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"Replay finished locally. Now check the result in ${REPLAY_BRANCH}." \
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"When done, run \"${SELF} --continue\" to push and create MR in gitlab." \
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"Use \"${SELF} --abort\" to abort the replay."
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}
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die_if_wrong_dir() {
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if [[ ! -d ".git" ]]; then
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die "You need to run this command from the toplevel of the working tree."
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fi
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}
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die_if_not_in_progress() {
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die_if_wrong_dir
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if [[ ! -f "${STATE_FILE}" ]]; then
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die "No replay-merge in progress?"
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fi
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}
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die_if_in_progress() {
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die_if_wrong_dir
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if [[ -f "${STATE_FILE}" ]]; then
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die "Another replay-merge in progress. Use --continue or --abort."
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fi
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}
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die_if_local_behind_target() {
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TARGET_REF_HEAD="$(git rev-list --max-count=1 "${TARGET_REF}")"
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if [[ "$(git merge-base "${TARGET_REF}" "${TARGET_BRANCH}")" != "${TARGET_REF_HEAD}" ]]; then
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die "Local branch ${TARGET_BRANCH} is behind ${TARGET_REF}, cannot merge into it." \
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"Update or remove the local branch, then run \"${SELF} --continue\"." \
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"Use \"${SELF} --abort\" to abort the replay."
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fi
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}
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branch_exists() {
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ESCAPED_BRANCH_NAME=${1//\//\\\/}
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BRANCH_REGEX="/^(remotes\/)?${ESCAPED_BRANCH_NAME}$/"
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if [[ -n "$(git branch -a | awk "\$NF ~ ${BRANCH_REGEX} {print \$NF}")" ]]; then
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return 0
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else
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return 1
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fi
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}
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go() {
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# Process parameters.
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SOURCE_COMMIT="$1"
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TARGET_REMOTE="$2"
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TARGET_BRANCH="$3"
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TARGET_REF="${TARGET_REMOTE}/${TARGET_BRANCH}"
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# Establish the range of commits comprising the source branch.
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REPLAY_COMMIT_RANGE="$(
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git show --format="%P" "${SOURCE_COMMIT}" 2>&1 \
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| sed -n "1s/\([0-9a-f]\{40\}\) \([0-9a-f]\{40\}\)/\1..\2/p;"
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)"
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if [[ -z "${REPLAY_COMMIT_RANGE}" ]]; then
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die "${SOURCE_COMMIT} is not a valid merge commit ID."
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fi
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# Extract the name of the source branch.
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SOURCE_BRANCH="$(
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git log --max-count=1 --format="%B" "${SOURCE_COMMIT}" \
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| sed -n "s/^Merge branch '\([^'][^']*\).*/\1/p;" \
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| head -n 1
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)"
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if [[ -z "${SOURCE_BRANCH}" ]]; then
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die "Unable to extract source branch name from ${SOURCE_COMMIT}."
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fi
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# Ensure the target ref is valid.
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if ! branch_exists "${TARGET_REF}"; then
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die "${TARGET_REF} is not a valid replay target."
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fi
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# Abort if a local branch with the name about to be used for replaying
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# the merge already exists.
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REPLAY_BRANCH="${SOURCE_BRANCH}-${TARGET_BRANCH}"
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if branch_exists "${REPLAY_BRANCH}"; then
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die "Local branch with name ${REPLAY_BRANCH} already exists." \
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"Cannot use it for replaying a merge."
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fi
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# Get the name of the currently checked out branch so that it can be
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# checked out again once the replay is finished.
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CHECKED_OUT_BRANCH="$(git branch | awk "\$1 == \"*\" {print \$2}")"
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# Store state in case it needs to be restored later.
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cat <<-EOF >"${STATE_FILE}"
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CHECKED_OUT_BRANCH="${CHECKED_OUT_BRANCH}"
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SOURCE_COMMIT="${SOURCE_COMMIT}"
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SOURCE_BRANCH="${SOURCE_BRANCH}"
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REPLAY_BRANCH="${REPLAY_BRANCH}"
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TARGET_REMOTE="${TARGET_REMOTE}"
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TARGET_BRANCH="${TARGET_BRANCH}"
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TARGET_REF="${TARGET_REF}"
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EOF
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# Announce the plan.
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echo "Attempting to replay ${REPLAY_COMMIT_RANGE} on top of ${TARGET_REF} in ${REPLAY_BRANCH}..."
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# Switch to the replay branch.
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git checkout -t -b "${REPLAY_BRANCH}" "${TARGET_REF}" >/dev/null
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# Try replaying the branch. If there is any conflict, the command will
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# fail, which means we need to bail and let the user fix the current
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# cherry-pick manually, expecting "git replay-merge --continue" to be
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# used afterwards. If there is no conflict, just proceed with what
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# --continue would do.
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if ! git cherry-pick -x "${REPLAY_COMMIT_RANGE}"; then
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die_with_continue_instructions
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fi
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resume
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}
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resume() {
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# If cherry-picking has not yet been completed, resume it. If it
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# fails, bail. If if succeeds, we can proceed with merging.
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if [[ -f ".git/sequencer/todo" ]]; then
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if ! git cherry-pick --continue; then
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die_with_continue_instructions
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fi
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fi
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if $DONT_PUSH; then
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die_before_push
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fi
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if $DONT_ACCEPT; then
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AUTO_MERGE=""
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else
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AUTO_MERGE="merge_request.merge_when_pipeline_succeeds"
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fi
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TITLE=""
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LABEL_VERSION=""
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LABEL_BACKPORT=""
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if ! $DONT_TAG && [[ $TARGET_BRANCH == bind-9.[0-9][0-9] ]]; then
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version="${TARGET_BRANCH#bind-}"
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TITLE="$(git show --format=%b ${SOURCE_COMMIT} | head -n 1)"
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TITLE="merge_request.title=[${version}] ${TITLE}"
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LABEL_VERSION="merge_request.label=v${version}"
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LABEL_BACKPORT="merge_request.label=Backport"
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fi
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git push -u ${TARGET_REMOTE} \
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-o merge_request.create \
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-o merge_request.remove_source_branch \
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-o "merge_request.target=${TARGET_BRANCH}" \
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${AUTO_MERGE:+-o} "${AUTO_MERGE}" \
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${TITLE:+-o} "${TITLE}" \
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${LABEL_VERSION:+-o} "${LABEL_VERSION}" \
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${LABEL_BACKPORT:+-o} "${LABEL_BACKPORT}" \
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"${REPLAY_BRANCH}:${REPLAY_BRANCH}"
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cleanup
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exit 0
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}
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cleanup() {
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# Restore working copy state from before the replay was started,
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# ignoring any potential errors to prevent "set -e" from interfering.
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{
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git merge --abort
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git cherry-pick --abort
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git checkout "${CHECKED_OUT_BRANCH}"
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} &>/dev/null || true
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rm -f "${STATE_FILE}"
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}
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cd $(git rev-parse --show-toplevel)
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next_action="go"
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args=3
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while [[ $# -ge 1 ]]; do
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case "$1" in
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"--no-push")
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DONT_PUSH=true
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;;
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"--push")
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DONT_PUSH=false
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;;
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"--no-tag")
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DONT_TAG=true
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;;
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"--tag")
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DONT_TAG=false
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;;
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"--abort")
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die_if_not_in_progress
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source "${STATE_FILE}"
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next_action="cleanup"
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args=0
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shift
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break
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;;
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"--continue")
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die_if_not_in_progress
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source "${STATE_FILE}"
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next_action="resume"
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args=0
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shift
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break
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;;
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--*)
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die_with_usage
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;;
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*)
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break
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;;
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esac
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shift
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done
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if [[ $# -ne $args ]]; then
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die_with_usage
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fi
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$next_action "$@"
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