$ git clone -n https://src.fedoraproject.org/rpms/mirrormagic.git /var/lib/mock/f40-build-746078-112355/root/chroot_tmpdir/scmroot/mirrormagic
Cloning into '/var/lib/mock/f40-build-746078-112355/root/chroot_tmpdir/scmroot/mirrormagic'...
$ git fetch origin 1d4f2a6820fa6602561f82087b85207566313ef7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mirrormagic
 * [new ref]         1d4f2a6820fa6602561f82087b85207566313ef7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d4f2a6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild