PIKApp/.gitlab/search-common-ancestor.sh

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#!/bin/bash
set -e
ancestor_horizon=28 # days (4 weeks)
# We need to add a new remote for the upstream target branch, since this script
# could be running in a personal fork of the repository which has out of date
# branches.
#
# Limit the fetch to a certain date horizon to limit the amount of data we get.
# If the branch was forked from origin/main before this horizon, it should
# probably be rebased.
if ! git ls-remote --exit-code upstream >/dev/null 2>&1 ; then
git remote add upstream https://gitlab.gnome.org/GNOME/pika.git
fi
git fetch --shallow-since="$(date --date="${ancestor_horizon} days ago" +%Y-%m-%d)" upstream &> ./fetch_upstream.log
# Work out the newest common ancestor between the detached HEAD that this CI job
# has checked out, and the upstream target branch (which will typically be
# `upstream/main` or `upstream/glib-2-62`).
# `${CI_MERGE_REQUEST_TARGET_BRANCH_NAME}` or `${CI_MERGE_REQUEST_SOURCE_BRANCH_NAME}`
# are only defined if were running in a merge request pipeline,
# fall back to `${CI_DEFAULT_BRANCH}` or `${CI_COMMIT_BRANCH}` respectively
# otherwise.
# add mr-origin
git remote add mr-origin ${CI_MERGE_REQUEST_SOURCE_PROJECT_URL}
source_branch="${CI_MERGE_REQUEST_SOURCE_BRANCH_NAME:-${CI_COMMIT_BRANCH}}"
git fetch --shallow-since="$(date --date="${ancestor_horizon} days ago" +%Y-%m-%d)" mr-origin "${source_branch}" &> ./fetch_origin.log
newest_common_ancestor_sha=$(diff --old-line-format='' --new-line-format='' <(git rev-list --first-parent "upstream/${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-${CI_DEFAULT_BRANCH}}") <(git rev-list --first-parent "mr-origin/${source_branch}") | head -1)
if [ -z "${newest_common_ancestor_sha}" ]; then
echo "Couldnt find common ancestor with upstream main branch. This typically"
echo "happens if you branched from main a long time ago. Please update"
echo "your clone, rebase, and re-push your branch."
exit 1
fi