$ git clone -n https://src.fedoraproject.org/rpms/mum-hash.git /var/lib/mock/f42-build-3281195-41341/root/chroot_tmpdir/scmroot/mum-hash
Cloning into '/var/lib/mock/f42-build-3281195-41341/root/chroot_tmpdir/scmroot/mum-hash'...
$ git fetch origin ac7c7496234a3d16584a60efae202480dfe1ff9b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mum-hash
 * [new ref]         ac7c7496234a3d16584a60efae202480dfe1ff9b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ac7c749 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild