$ git clone -n https://src.fedoraproject.org/rpms/skychart.git /var/lib/mock/f39-build-1986827-43353/root/chroot_tmpdir/scmroot/skychart
Cloning into '/var/lib/mock/f39-build-1986827-43353/root/chroot_tmpdir/scmroot/skychart'...
$ git fetch origin c8afa8c3e19c1be7b9cec797e589866ce5285b52:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/skychart
 * [new ref]         c8afa8c3e19c1be7b9cec797e589866ce5285b52 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8afa8c Update to latest svn snapshot