$ git clone -n https://src.fedoraproject.org/rpms/skychart.git /var/lib/mock/f41-build-855061-167060/root/chroot_tmpdir/scmroot/skychart
Cloning into '/var/lib/mock/f41-build-855061-167060/root/chroot_tmpdir/scmroot/skychart'...
$ git fetch origin c7cacc4ff6936d1023913fda9dfad4321daa2582:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/skychart
 * [new ref]         c7cacc4ff6936d1023913fda9dfad4321daa2582 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7cacc4 Fix F41 FTB (Fedora#2301274)