$ git clone -n https://src.fedoraproject.org/rpms/llvm12.git /var/lib/mock/f42-build-3401462-45130/root/chroot_tmpdir/scmroot/llvm12
Cloning into '/var/lib/mock/f42-build-3401462-45130/root/chroot_tmpdir/scmroot/llvm12'...
$ git fetch origin 73ba30c91eaac63037bd557e3c07c9251de8839d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm12
 * [new ref]         73ba30c91eaac63037bd557e3c07c9251de8839d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73ba30c Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild