$ git clone -n https://src.fedoraproject.org/rpms/libmamba.git /var/lib/mock/f40-build-786156-134198/root/chroot_tmpdir/scmroot/libmamba
Cloning into '/var/lib/mock/f40-build-786156-134198/root/chroot_tmpdir/scmroot/libmamba'...
$ git fetch origin 030f9b9d290cac087e5416fe83acd6869b66371d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmamba
 * [new ref]         030f9b9d290cac087e5416fe83acd6869b66371d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 030f9b9 Update to 1.5.6