$ git clone -n https://src.fedoraproject.org/rpms/gimagereader.git /var/lib/mock/f41-build-860054-168769/root/chroot_tmpdir/scmroot/gimagereader
Cloning into '/var/lib/mock/f41-build-860054-168769/root/chroot_tmpdir/scmroot/gimagereader'...
$ git fetch origin 9df8fb61381d8108626a01933c51963b45bc4636:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimagereader
 * [new ref]         9df8fb61381d8108626a01933c51963b45bc4636 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9df8fb6 Write changelog entry