$ git clone -n https://src.fedoraproject.org/rpms/aunit.git /var/lib/mock/f39-build-2519425-61728/root/chroot_tmpdir/scmroot/aunit
Cloning into '/var/lib/mock/f39-build-2519425-61728/root/chroot_tmpdir/scmroot/aunit'...
$ git fetch origin b2f0be3cd3436657551a2bd0a9ab10e7a1c8d25b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/aunit
 * [new ref]         b2f0be3cd3436657551a2bd0a9ab10e7a1c8d25b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b2f0be3 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild