$ git clone -n https://src.fedoraproject.org/rpms/OpenMolcas.git /var/lib/mock/f39-build-1920237-42951/root/chroot_tmpdir/scmroot/OpenMolcas
Cloning into '/var/lib/mock/f39-build-1920237-42951/root/chroot_tmpdir/scmroot/OpenMolcas'...
$ git fetch origin 7db7be8001730fa2ae603ff43c88bd9b80cc7ec8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/OpenMolcas
 * [new ref]         7db7be8001730fa2ae603ff43c88bd9b80cc7ec8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7db7be8 Forgot to add source