$ git clone -n https://src.fedoraproject.org/rpms/perl-LMDB_File.git /var/lib/mock/f40-build-779128-130214/root/chroot_tmpdir/scmroot/perl-LMDB_File
Cloning into '/var/lib/mock/f40-build-779128-130214/root/chroot_tmpdir/scmroot/perl-LMDB_File'...
$ git fetch origin 36b64a66e393607b4cffd5025a06c43e90ccff73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-LMDB_File
 * [new ref]         36b64a66e393607b4cffd5025a06c43e90ccff73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 36b64a6 Update to 0.13