$ git clone -n https://src.fedoraproject.org/rpms/unlambda.git /var/lib/mock/f42-build-878694-181207/root/chroot_tmpdir/scmroot/unlambda
Cloning into '/var/lib/mock/f42-build-878694-181207/root/chroot_tmpdir/scmroot/unlambda'...
$ git fetch origin f24aa23db1cbae6d6bd6beda42c7467f89622096:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/unlambda
 * [new ref]         f24aa23db1cbae6d6bd6beda42c7467f89622096 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f24aa23 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild