$ git clone -n https://src.fedoraproject.org/rpms/luminance-hdr.git /var/lib/mock/f41-build-815482-149534/root/chroot_tmpdir/scmroot/luminance-hdr
Cloning into '/var/lib/mock/f41-build-815482-149534/root/chroot_tmpdir/scmroot/luminance-hdr'...
$ git fetch origin fcb0c293e29ab9829412d08e575dbd26ad8923ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luminance-hdr
 * [new ref]         fcb0c293e29ab9829412d08e575dbd26ad8923ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcb0c29 Rebuilt for exiv2 0.28.2