Hello dear esteemed monks,

We have a project with a lot of CPAN dependencies. So we need to install them, meeting the following conditions:

• Exactly the same set of modules is installed on all of our production servers;
• The developers are able to add dependencies at will, without ops interaction (after code review, of course);
• The build happens at every commit and it doesn't take forever.

What we currently do is:

• unpack dependency cache;
• install missing dependencies with cpanm;
• run test suite against the updated library;
• update dependency cache;
• pack libraries together with the product itself into a huge tarball;
• distribute the tarball to the servers, if needed.

What I'm currently pushing for is to build the dependency cache from scratch from time to time (say weekly) and only install the missing modules (we don't add new dependencies every day after all). This would increase the resilience to changes in upstream and also allow to purge unused dependencies.

But maybe there's a better way to achieve the stated requirements?

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