5 ancestor_horizon=28 # days (4 weeks)
7 # Recently, git is picky about directory ownership. Tell it not to worry.
8 git config --global --add safe.directory "$PWD"
10 # We need to add a new remote for the upstream target branch, since this script
11 # could be running in a personal fork of the repository which has out of date
14 # Limit the fetch to a certain date horizon to limit the amount of data we get.
15 # If the branch was forked from origin/main before this horizon, it should
16 # probably be rebased.
17 if ! git ls-remote --exit-code upstream >/dev/null 2>&1 ; then
18 git remote add upstream https://gitlab.gnome.org/GNOME/glib.git
21 # Work out the newest common ancestor between the detached HEAD that this CI job
22 # has checked out, and the upstream target branch (which will typically be
23 # `upstream/main` or `upstream/glib-2-62`).
24 # `${CI_MERGE_REQUEST_TARGET_BRANCH_NAME}` or `${CI_MERGE_REQUEST_SOURCE_BRANCH_NAME}`
25 # are only defined if we’re running in a merge request pipeline,
26 # fall back to `${CI_DEFAULT_BRANCH}` or `${CI_COMMIT_BRANCH}` respectively
29 source_branch="${CI_MERGE_REQUEST_SOURCE_BRANCH_NAME:-${CI_COMMIT_BRANCH}}"
30 target_branch="${CI_MERGE_REQUEST_TARGET_BRANCH_NAME:-${CI_DEFAULT_BRANCH}}"
32 git fetch --shallow-since="$(date --date="${ancestor_horizon} days ago" +%Y-%m-%d)" origin "${source_branch}"
33 git fetch --shallow-since="$(date --date="${ancestor_horizon} days ago" +%Y-%m-%d)" upstream "${target_branch}"
35 newest_common_ancestor_sha=$(git merge-base "upstream/${target_branch}" "origin/${source_branch}")
37 if [ -z "${newest_common_ancestor_sha}" ]; then
38 echo "Couldn’t find common ancestor with upstream main branch. This typically"
39 echo "happens if you branched from main a long time ago. Please update"
40 echo "your clone, rebase, and re-push your branch."