[Octave-bug-tracker] [bug #60053] package: dependency may also be octave itself.

[Philip Nienhuis]

Follow-up Comment #7, bug #60053 (project octave):

@Ernst:
Sorry I misunderstood it was about the docs.

BTW I'm not a package developer but package maintainer. Admittedly I did
develop a few functions, perhaps that's where the confusion comes from :-)

As to comment #5, package dependencies are checked in private function
"get_unsatisfied_dependencies.m" and that *does* invoke compare_versions.m
...

function bad_deps = get_unsatisfied_deps (desc, installed_pkgs_lst,
                                          uninstall_flag = false)

  bad_deps = {};

  ## For each dependency.
  for i = 1:length (desc.depends)
    dep = desc.depends{i};

    ## Is the current dependency Octave?
    if (strcmp (dep.package, "octave"))
      if (! compare_versions (OCTAVE_VERSION, dep.version, dep.operator))
        bad_deps{end+1} = dep;
      endif
      ## Is the current dependency not Octave?
    else
      ok = xor (false, uninstall_flag);
      for i = 1:length (installed_pkgs_lst)
        cur_name = installed_pkgs_lst{i}.name;
        cur_version = installed_pkgs_lst{i}.version;
        if (strcmp (dep.package, cur_name)
            && compare_versions (cur_version, dep.version, dep.operator))
          ok = xor (true, uninstall_flag);
          break;
        endif
      endfor
      if (! ok)
        bad_deps{end+1} = dep;
      endif
    endif
  endfor


It's rather compare_versions that supports a limited set of comparison
operators.  As you can see above, "!=" is supported invoking compare_versions
with an "=" operator and then negating compare_version's output.


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