os.userInfo throws if no username in docker container

[raido]

Original issue opened here: sindresorhus/username#21

It turns out that running a script with docker run with --user flag set, then user actually has no $HOME or username. This in turn causes following error: uv_os_get_passwd returned ENOENT (no such file or directory) if os.userInfo() is accessed.

Some people have resorted to try catch blocks:

https://github.com/moleculerjs/moleculer/pull/396/files#diff-38423b3db1f1c2a43666c7ad898ba126R45

But is is not documented that os.userInfo() ever throws - https://nodejs.org/dist/latest-v10.x/docs/api/os.html#os_os_userinfo_options

• Version: v8, v10
• Platform: Linux, Docker container

[cjihrig]

I think the behavior is correct. A documentation PR would be welcome though.

[raido]

I guess it throws right here - https://github.com/nodejs/node/blob/master/lib/os.js#L253 ?

It does not seem like it ever gets to the next line to throw the generic error with empty context.

Edit: Or it actually mutates the ctx object and that's how the detailed message gets printed?

[cjihrig]

The error returned from uv_os_get_passwd() is attached to ctx here, and then thrown in JavaScript here. If you (or anyone else) want to update the docs, they are located here.

[zardaloop]

Hi @raido even-though I am running node:12.0.0 on docker I still get the same error? Is there anything else I need to do to resolve this issue ?
I posted the question on stackoverflow as well but no luck with it yet https://stackoverflow.com/questions/61961485/a-system-error-occurred-uv-os-get-passwd-returned-enoent-no-such-file-or-direc?noredirect=1#comment109603079_61961485

[raido]

Maybe you could use this package: https://github.com/sindresorhus/username?

It has fallback logic for missing username case: sindresorhus/username#22