$ git clone -n https://src.fedoraproject.org/rpms/flang.git /var/lib/mock/f39-build-1873777-42725/root/chroot_tmpdir/scmroot/flang
Cloning into '/var/lib/mock/f39-build-1873777-42725/root/chroot_tmpdir/scmroot/flang'...
$ git fetch origin cb471028148da6da2bf354252c864fca8c595b12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flang
 * [new ref]         cb471028148da6da2bf354252c864fca8c595b12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb47102 Update to LLVM 17.0.6