$ git clone -n https://src.fedoraproject.org/rpms/clang11.0.git /var/lib/mock/f40-build-2560849-62130/root/chroot_tmpdir/scmroot/clang11.0
Cloning into '/var/lib/mock/f40-build-2560849-62130/root/chroot_tmpdir/scmroot/clang11.0'...
$ git fetch origin 9707a2a1cd102e51ac39a5410380cf4aeacfcb3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/clang11.0
 * [new ref]         9707a2a1cd102e51ac39a5410380cf4aeacfcb3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9707a2a Added the README