$ git clone -n https://src.fedoraproject.org/rpms/compiler-rt.git /var/lib/mock/f41-build-side-1-3133758-39700/root/chroot_tmpdir/scmroot/compiler-rt
Cloning into '/var/lib/mock/f41-build-side-1-3133758-39700/root/chroot_tmpdir/scmroot/compiler-rt'...
$ git fetch origin 85df61d70e1481a5bf0b811445014606a30c73af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compiler-rt
 * [new ref]         85df61d70e1481a5bf0b811445014606a30c73af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85df61d Merged into llvm package