$ git clone -n https://src.fedoraproject.org/rpms/gcal.git /var/lib/mock/f39-build-2249640-54005/root/chroot_tmpdir/scmroot/gcal
Cloning into '/var/lib/mock/f39-build-2249640-54005/root/chroot_tmpdir/scmroot/gcal'...
$ git fetch origin dd589d8dae0eb49f2da10597045239c952d5b65d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gcal
 * [new ref]         dd589d8dae0eb49f2da10597045239c952d5b65d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd589d8 Backport segfault fix from upstream