Better error message when resolving conflics

[deric]

When trying librarian-puppet update it's really complicated to find out the cause of all the conflict. The error message is not helpful at all:

Could not resolve the dependencies.

even when running with verbose flag:

[Librarian] Conflict between puppetlabs-apt (>= 2.0.1) <https://forgeapi.puppetlabs.com> and puppetlabs-apt (< 2.0.0, >= 1.4.0) <https://forgeapi.puppetlabs.com>

it's not clear which module requested which version. Would it be possible to print that information?

e.g.

module puppet-foo(0.3.1) requires puppetlabs-apt (< 2.0.0)
however puppet-bar(xxxxx) requires puppetlabs-apt (> 2.0.1) 

[carlossg]

PRs welcome

[petems]

I actually had a look into this as I hit the same issue, but it's actually in the upstream library rather than this gem and seemed a little complicated to solve, unfortunately.

I ended up making a quick script to show all the dependencies from a Puppetfile, then use that to help show where the conflicts come from, not perfect but maybe it will help someone else? https://github.com/petems/puppet-module-dependancy-lister