'lstat package.json: no such file or directory' using node:onbuild

[nodejs]

'lstat package.json: no such file or directory' using node:onbuild

[Starefossen]

Do you have a package.json in the same directory as you Dockerfile?

[arielelkin]

No.

$ ls -a
.  ..  Dockerfile

[Starefossen]

Well, there is your problem. The :onbuild image variant requires a package.json to be in the same directory as your Dockerfile.

[arielelkin]

What? Doesn't this defeat the whole point of Docker?

[Starefossen]

No, absolutely not. Also, the :onbuild image variant is a special purpose image.

Can you please read this guide on how to get your Node.js application into Docker: https://nodejs.org/en/docs/guides/nodejs-docker-webapp/

[arielelkin]

I get it.. A package.json is required to build node. I'll keep reading up on it, thanks.

But please consider mentioning that in this repo's README.

[tianon]

I thought we'd already added something about that, and it appears we did: (https://hub.docker.com/_/node/; referring specifically to the :onbuild variant)

The image assumes that your application has a file named package.json listing its dependencies and defining its start script.

Maybe it needs to be more obvious? (I'm sure it'd probably help if the fix for docker/hub-feedback#446 were pushed out 😢)

[arielelkin]

I meant in https://github.com/nodejs/docker-node/blob/master/README.md