$ git clone -n https://src.fedoraproject.org/rpms/mingw-llvm.git /var/lib/mock/f41-build-1555785-23978/root/chroot_tmpdir/scmroot/mingw-llvm
Cloning into '/var/lib/mock/f41-build-1555785-23978/root/chroot_tmpdir/scmroot/mingw-llvm'...
$ git fetch origin d5518f66308982c4481b59e295c584ba03ebca20:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-llvm
 * [new ref]         d5518f66308982c4481b59e295c584ba03ebca20 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5518f6 Update to 18.1.8