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Node Cache shouldn't persist when there is a change in dependency

Abhenavh Prakash

In our Bitbucket pipeline, we are caching the node modules.

caches:

- node

We are doing this to make sure we don't download the node modules if it is already present in the cache.

But when there is a change in the package.json dependency (added a new npm package and used in the components), we are expecting the pipeline to re-fetch the node modules instead of taking it from the cache.

What happens currently is: when there is a cache for node modules exists in pipeline irrespective of the current status of package.json, the node cache is being used. Ideally, node modules has to be refreshed in refernce to the package.json

So, the pipeline fails. When we delete the node cache manually and re-run the same pipeline, it gets succeeded.

Thanks in advance for your help.

Accepted answers

All comments

Steven Vaccarella

Hi Abhenavh,

I don't know much about node, but my understanding is that if you update a dependency in package.json (eg. add a new package that you haven't used before or update to the latest version of an existing package) then that new dependency won't be present in the cache (and so it will have to be downloaded). Are you saying that the cache is giving you the wrong version of a package (ie. with a different version number from the one you were expecting)?

Abhenavh Prakash

Node Cache in the BitBucket pipeline is not getting updated. It remains the same even if we update the dependencies. So, we have to manually delete the Node Cache and re-run the pipeline build to make it succeed.

Steven Vaccarella

Ok, I think I understand now. You're saying that the build works but it needs to download the new dependencies every time because the cache doesn't get updated? That's expected behaviour. By design the cache only gets updated automatically once per week. If you want to update it earlier then you need to manually delete it. We don't currently support automatic cache updates because it's actually a bit tricky to do reliably (many build tools will make minor updates to their caches on every build, such as by changing timestamps, even though there are no changes to dependencies, so detecting when a cache has changed generically across all tools is not trivial).

But we do have an open (and highly voted) issue for improving the cache system: https://bitbucket.org/site/master/issues/16314/refresh-caches-when-dependencies-are

I'd recommend you watch and vote on that issue.

Abhenavh Prakash

Yes. Whenever there is a change in the "package.json" the node cache has to be updated automatically. If the node cache is not updating automatically, then we have to delete the node cache manually and run the build. Then the build will succeed.

I'm just curious to know these:

Is there any way to delete the node cache automatically?
Is it mandatory to use 'node - cache' while building or we can skip it and download the node modules every time when we build?

coreyworrell

Coming in late, but this is what we currently do:

pipelines:
  branches:
    staging:
      -step:
        caches:
          - npm

definitions:
  caches:
    npm: ~/.npm

This uses the internal npm cache which will download dependencies if they have updated since last run.

Yogeshwar Chaudhari

@Abhenavh Prakash @Jardel Weyrich @Steven Vaccarella @Mike Hesler

Are there any updates on this issue? Have you found out any third party pipes or something other that does it for you?

Rob Bradshaw

I can't see any progress on this issue. this is a system breaking issue... If a dependency is updated, bitbucket takes the cache instead of updating all dependencies. this results in a pipeline failure.

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