$ git clone -n https://src.fedoraproject.org/rpms/llvm12.git /var/lib/mock/f41-build-1702088-24562/root/chroot_tmpdir/scmroot/llvm12
Cloning into '/var/lib/mock/f41-build-1702088-24562/root/chroot_tmpdir/scmroot/llvm12'...
$ git fetch origin 5559e11e0a6db3487236681e9e65a4c61e8d74a1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm12
 * [new ref]         5559e11e0a6db3487236681e9e65a4c61e8d74a1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5559e11 fix go binding test: replace removed python pipes use with shlex