$ git clone -n https://src.fedoraproject.org/rpms/llvm8.0.git /var/lib/mock/f38-build-719862-97310/root/chroot_tmpdir/scmroot/llvm8.0
Cloning into '/var/lib/mock/f38-build-719862-97310/root/chroot_tmpdir/scmroot/llvm8.0'...
$ git fetch origin ad264d9bdb698bf9390e7ad236404679beb23f26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm8.0
 * [new ref]         ad264d9bdb698bf9390e7ad236404679beb23f26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad264d9 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild