$ git clone -n https://src.fedoraproject.org/rpms/compiler-rt.git /var/lib/mock/f41-build-810450-146694/root/chroot_tmpdir/scmroot/compiler-rt
Cloning into '/var/lib/mock/f41-build-810450-146694/root/chroot_tmpdir/scmroot/compiler-rt'...
$ git fetch origin bd6a883a0e3acb341ef52974e3eb18d3854a7a82:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compiler-rt
 * [new ref]         bd6a883a0e3acb341ef52974e3eb18d3854a7a82 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd6a883 18.1.6 Release