$ git clone -n https://src.fedoraproject.org/rpms/icebreaker.git /var/lib/mock/f38-build-side-42-init-devel-617995-26325/root/chroot_tmpdir/scmroot/icebreaker
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-617995-26325/root/chroot_tmpdir/scmroot/icebreaker'...
$ git fetch origin 991c589a92f77109fb35e354e4de0b36353c0ed6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/icebreaker
 * [new ref]         991c589a92f77109fb35e354e4de0b36353c0ed6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 991c589 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild