$ git clone -n https://src.fedoraproject.org/rpms/gvfs.git /var/lib/mock/f40-build-795342-140108/root/chroot_tmpdir/scmroot/gvfs
Cloning into '/var/lib/mock/f40-build-795342-140108/root/chroot_tmpdir/scmroot/gvfs'...
$ git fetch origin 1969653cb3cef0266363dbbc6f42b987e67bb150:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gvfs
 * [new ref]         1969653cb3cef0266363dbbc6f42b987e67bb150 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1969653 Update to 1.53.90