$ git clone -n https://src.fedoraproject.org/rpms/lua-ldoc.git /var/lib/mock/f45-build-17662-502/root/chroot_tmpdir/scmroot/lua-ldoc
Cloning into '/var/lib/mock/f45-build-17662-502/root/chroot_tmpdir/scmroot/lua-ldoc'...
$ git fetch origin 5783094875e21bf7bdc60763b06bb66206e770e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-ldoc
 * [new ref]         5783094875e21bf7bdc60763b06bb66206e770e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5783094 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild