Can't resolve repositories on which installed repositories depend.

[eric225125]

I came across this problem after I synced ::SuperHeron?-misc, which had just added a dependency on ::virtualization, which I did not yet have installed. It appears impossible for me to install ::virtualization without first uninstalling ::SuperHeron?-misc:

% sudo cave resolve repository/virtualization Error:

• In program cave resolve repository/virtualization:
• When making environment from specification :
• When loading paludis configuration:
• Repository 'SuperHeron?-misc' requires repository 'virtualization', which is

not configured (paludis::ConfigurationError?)

% sudo cave resolve --no-complete -z repository/virtualization Error:

• In program cave resolve --no-complete -z repository/virtualization:
• When making environment from specification :
• When loading paludis configuration:
• Repository 'SuperHeron?-misc' requires repository 'virtualization', which is

not configured (paludis::ConfigurationError?)

[ciaranm]

The issue's more general than that: a repository isn't usable at all unless its masters are all there.

It's not entirely clear how we can handle this elegantly. One option is to make a repository 'empty' rather than in error if some of its masters are missing. But I'm not entirely sure that that won't cause something even weirder to happen...