os.userInfo throws if no username in docker container

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

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

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?

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.

doc: document os.userInfo() throwing SystemError

@raido

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

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

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

@raido

many thanks @raido what do you mean exactly by that. instead of which package I should used that? I am trying to do ember build that's where I get this error.

Does you app happen to use ember-cli-cjs-transform package? - rwjblue/ember-cli-cjs-transform#123

no I don't have that specific package, The only package I found in my project that references uv_os_get_passwd , is in node-gyp . It seems in the latest version of it ( v 5.1.1) this issue is somehow addressed nodejs/node-gyp@c4002de, but updating it to that version still not resolving the issue :( . Is there an workaround that I can use within jenkins to fix this issue? I am using jenkins Pipeline and I have simply :

agent {
        docker { 
            image 'node:12'
            args "-v ${env.JENKINS_HOME}:/workspace"
            reuseNode true
        }
        
    }

it turned out all I needed to do was adding docker volumne mapping from /etc/passwd to /etc/passwd. like this :

agent {
        docker { 
            image 'node:12'
            args "-v /etc/passwd:/etc/passwd"
            reuseNode true
        }        
 }

doc: document os.userInfo() throwing SystemError

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os.userInfo throws if no username in docker container #25714

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os.userInfo throws if no username in docker container #25714

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cjihrig commented on Jan 25, 2019

raido commented on Jan 25, 2019

cjihrig commented on Jan 25, 2019

zardaloop commented on May 25, 2020

raido commented on May 25, 2020

zardaloop commented on May 25, 2020

raido commented on May 25, 2020

zardaloop commented on May 25, 2020

zardaloop commented on May 26, 2020

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