$ git clone -n https://src.fedoraproject.org/rpms/celluloid.git /var/lib/mock/f42-build-3426590-45197/root/chroot_tmpdir/scmroot/celluloid
Cloning into '/var/lib/mock/f42-build-3426590-45197/root/chroot_tmpdir/scmroot/celluloid'...
$ git fetch origin 3542c69c82b81d07748c1aa8d457cc2dbdcf3e4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/celluloid
 * [new ref]         3542c69c82b81d07748c1aa8d457cc2dbdcf3e4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3542c69 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild