$ git clone -n https://src.fedoraproject.org/rpms/luminance-hdr.git /var/lib/mock/f40-build-805663-144839/root/chroot_tmpdir/scmroot/luminance-hdr
Cloning into '/var/lib/mock/f40-build-805663-144839/root/chroot_tmpdir/scmroot/luminance-hdr'...
$ git fetch origin f794171de94f1977ad7729333bfd115d9af223cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/luminance-hdr
 * [new ref]         f794171de94f1977ad7729333bfd115d9af223cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f794171 Add developer ID in AppData (fix FTBFS with appstream 1.0.2)