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child_process: document the error when cwd does not exist #34505

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child_process: document the error when cwd does not exist #34505

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FeelyChau
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@FeelyChau FeelyChau commented Jul 24, 2020

If the option cwd does not exist, the error ENOENT is the same as the error emitted when the command does not exist, it's confusing.

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@nodejs-github-bot nodejs-github-bot added child_process Issues and PRs related to the child_process subsystem. doc Issues and PRs related to the documentations. labels Jul 24, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.
@Trott
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Trott commented Jul 28, 2020

Welcome @FeelyChau and thanks for the pull request. ENOENT means a path (whether file, directory, or other) does not exist. The additional information included with the error should make it clear whether the issue is the directory path or the command path. I'm not really sure this is a good thing to add to the docs. The errors should be self-explanatory. But let's see if others think differently. @nodejs/documentation @nodejs/child_process

@FeelyChau
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@Trott Thanks for review.
Here is the code:

const ChildProcess = require('child_process');

const cp = ChildProcess.spawn('/usr/local/bin/node', [], { cwd: 'path_not_exists' });

cp.on('error', (err) => {
    console.log(err);
})

the output:

Error: spawn /usr/local/bin/node ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:267:19)
    at onErrorNT (internal/child_process.js:469:16)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn /usr/local/bin/node',
  path: '/usr/local/bin/node',
  spawnargs: []
}

The error is not specific.
I think the reason is libuv throw the ENOENT only, so we could not know the specific reasons.
Look at:

uv__write_int(error_fd, UV__ERR(errno));

@yorkie
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yorkie commented Jul 28, 2020

I did address a bug related in mine until I found the call to chdir() at libuv. So IMO the other developers may not have an idea about considering it's an error caused by the cwd path. The cwd in options usually means it's an optional argument, and it wouldn't throw the same error from the required arguments which may be a little bit confusing :)

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I'm good with this personally.

@aduh95 aduh95 added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. review wanted PRs that need reviews. labels Nov 8, 2020
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@aduh95 aduh95 added author ready PRs that have at least one approval, no pending requests for changes, and a CI started. commit-queue Add this label to land a pull request using GitHub Actions. and removed stalled Issues and PRs that are stalled. commit-queue Add this label to land a pull request using GitHub Actions. labels Nov 12, 2020
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aduh95 commented Nov 14, 2020

Landed in bea9857

aduh95 pushed a commit that referenced this pull request Nov 14, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.

PR-URL: #34505
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@aduh95 aduh95 closed this Nov 14, 2020
codebytere pushed a commit that referenced this pull request Nov 22, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.

PR-URL: #34505
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@codebytere codebytere mentioned this pull request Nov 22, 2020
BethGriggs pushed a commit that referenced this pull request Dec 9, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.

PR-URL: #34505
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
BethGriggs pushed a commit that referenced this pull request Dec 10, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.

PR-URL: #34505
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@BethGriggs BethGriggs mentioned this pull request Dec 10, 2020
BethGriggs pushed a commit that referenced this pull request Dec 15, 2020
If the option cwd does not exist, the error ENOENT is the same as
the error emitted when the command does not exist, it's confusing.

PR-URL: #34505
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
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6 participants