$ git clone -n https://src.fedoraproject.org/rpms/compiler-rt18.git /var/lib/mock/f41-build-854436-166868/root/chroot_tmpdir/scmroot/compiler-rt18
Cloning into '/var/lib/mock/f41-build-854436-166868/root/chroot_tmpdir/scmroot/compiler-rt18'...
$ git fetch origin 8ea97227732c929cda70eb5ca0e2542022cd5f88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compiler-rt18
 * [new ref]         8ea97227732c929cda70eb5ca0e2542022cd5f88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8ea9722 Add conflicts with next major version of non-compat package