$ git clone -n https://src.fedoraproject.org/rpms/llvm16.git /var/lib/mock/f40-build-2172945-51046/root/chroot_tmpdir/scmroot/llvm16
Cloning into '/var/lib/mock/f40-build-2172945-51046/root/chroot_tmpdir/scmroot/llvm16'...
$ git fetch origin 1412a43accedd12abca9f51031416b7932ed37e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm16
 * [new ref]         1412a43accedd12abca9f51031416b7932ed37e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1412a43 Add missing sources