$ git clone -n https://src.fedoraproject.org/rpms/ginga.git /var/lib/mock/f40-build-2251737-54146/root/chroot_tmpdir/scmroot/ginga
Cloning into '/var/lib/mock/f40-build-2251737-54146/root/chroot_tmpdir/scmroot/ginga'...
$ git fetch origin 6048e0f2caa26425b5636bc89ab8c10e41f01034:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ginga
 * [new ref]         6048e0f2caa26425b5636bc89ab8c10e41f01034 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6048e0f Update to 4.1.1