$ git clone -n https://src.fedoraproject.org/rpms/llvm7.0.git /var/lib/mock/f40-build-769625-125732/root/chroot_tmpdir/scmroot/llvm7.0
Cloning into '/var/lib/mock/f40-build-769625-125732/root/chroot_tmpdir/scmroot/llvm7.0'...
$ git fetch origin 1371b69a2b9f4022532529d993b10896bf8add51:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/llvm7.0
 * [new ref]         1371b69a2b9f4022532529d993b10896bf8add51 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1371b69 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild