depend_on_asset doesn't depend_on

[matthewd]

Hi!

While working on rails/sprockets-rails#126, I discovered that (at least in 2.11.0, which Rails is temporarily effectively stuck on) depend_on_asset causes a dependency upon the named asset's dependencies, but not on the asset itself.

dependencies is (quite reasonably) defined as not including the asset itself: https://github.com/sstephenson/sprockets/blob/2.x/lib/sprockets/bundled_asset.rb#L62-65

But when processing _dependency_paths, we only record entries for the dependencies of asset: https://github.com/sstephenson/sprockets/blob/2.x/lib/sprockets/processed_asset.rb#L136-139

I haven't looked as closely, but at a glance, it sounds like master has the same behaviour: https://github.com/sstephenson/sprockets/blob/master/lib/sprockets/processed_asset.rb#L126-127

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Is this intended? The internal uses of depend_on_asset suggest not, to me.

If it is in fact unintentional... is there any chance of us getting a 2.11.2 (building from 2.11.0, and pretending 2.11.1 didn't exist), or even a 2.11.0.1? (And presumably a 2.11.x branch to temporarily support it)

We obviously all want to get the incompatibility sorted out properly, and soon... but in the meantime, it sure makes me nervous that part of the Rails default gem suite has a hard <= dep.

❤️

[josh]

The assets own mtime is always checked as a dependency. So assets are always dependent on themselves regardless of depend_on.

[matthewd]

That's not what I'm describing: we fail to check the mtime of the file named in the depend_on_asset line.