$ git clone -n https://src.fedoraproject.org/rpms/skychart.git /var/lib/mock/f40-build-1924503-25102/root/chroot_tmpdir/scmroot/skychart
Cloning into '/var/lib/mock/f40-build-1924503-25102/root/chroot_tmpdir/scmroot/skychart'...
$ git fetch origin c1a1464affe875716cf4444ef1c37f876bdded5c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/skychart
 * [new ref]         c1a1464affe875716cf4444ef1c37f876bdded5c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c1a1464 Update to latest svn version