$ git clone -n https://src.fedoraproject.org/rpms/gvfs.git /var/lib/mock/f41-build-851555-165998/root/chroot_tmpdir/scmroot/gvfs
Cloning into '/var/lib/mock/f41-build-851555-165998/root/chroot_tmpdir/scmroot/gvfs'...
$ git fetch origin 51c9414de933b8174b68a34a9def9edd839007d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gvfs
 * [new ref]         51c9414de933b8174b68a34a9def9edd839007d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51c9414 Update to 1.56.0