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add unistd::getcwd and unistd::mkdir #416

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merged 9 commits into from
Sep 7, 2016
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philippkeller
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As a (late) followup of this withdrawn PR I have added getcwd (wrapper around libc::getcwd) and mkdir (wrapper around libc::mkdir) and added testing.

A few notes:

  • I'm new to rust so I would appreciate some pair of eyes testing the code, plus I'm open for revision of code or general remarks about my coding style
  • I have run the tests both on OSX as on Linux (Ubuntu)
  • I've run clippy to see if my code is well formatted, however clippy issues many warnings about the project. I think I didn't add any more warnings
  • the methods in unistd are not documented so I also left out the documentation of getcwd and mkdir, although I think it'd probably be good to add some documentation, especially some example code how to use the methods
  • the base idea of getcwd is taken from std, should I mention that somewhere?

@philippkeller
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oh, failing tests for Rust 1.2, I'll check the errors in a few hours

@posborne
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posborne commented Sep 6, 2016

oh, failing tests for Rust 1.2, I'll check the errors in a few hours

Looks like the errors should be pretty easy to resolve. At some point, I think we're OK with dropping 1.2 but in this case, it should be pretty easy to satisfy the compiler.

@philippkeller
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@posborne indeed, I'm almost there. I ended up with an exact copy of the implementation in std (which I somehow was not able to make running but found out that I needed to add use std::os::unix::ffi::OsStringExt to bring the unix specific trait from_vec into scope)

// ERANGE means buffer was too small to store directory name
if error != Errno::ERANGE {
return Err(Error::Sys(error));
}
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Trailing whitespace.

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Thanks for the hint. I've corrected those now. Any idea why cargo clippy did not warn about those?

"/private/tmp/"
} else {
"/tmp/"
};
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This seems a little fragile. I think it would be OK to just verify that the nix getcwd results match those of libstd without hardcoding absolute base paths which may change based on the OS and system (My tmpfs may not be at /tmp).

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good idea, I'll change this and add documentation for getcwd and mkdir

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posborne commented Sep 6, 2016

the methods in unistd are not documented so I also left out the documentation of getcwd and mkdir, although I think it'd probably be good to add some documentation, especially some example code how to use the methods

I would like to see the documentation of nix improve. We would welcome documentation (including examples) for new code.

@philippkeller
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@posborne I fixed the test and added documentation for getcwd and mkdir. Can you have a look again?

use std::mem;
use std::ffi::CString;
use std::ffi::{CString,CStr,OsString};
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nit: spaces after comma.

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resolved

assert!(mkdir(tmp_dir.as_path(), stat::S_IRWXU).is_ok());
}
assert!(chdir(tmp_dir.as_path()).is_ok());
assert_eq!(getcwd().unwrap(), current_dir().unwrap());
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I just noticed that this code is indented with 2-spaces for some reason. Should be 4.

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Running rustfmt as a last step of preparing a PR should be added to our CONTRIBUTING.md.

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posborne commented Sep 7, 2016

@homu r+

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homu commented Sep 7, 2016

📌 Commit 7dd12c6 has been approved by posborne

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homu commented Sep 7, 2016

⚡ Test exempted - status

@homu homu merged commit 7dd12c6 into nix-rust:master Sep 7, 2016
homu added a commit that referenced this pull request Sep 7, 2016
add unistd::getcwd and unistd::mkdir

As a (late) followup of [this withdrawn PR](rust-lang/libc#326) I have added getcwd (wrapper around `libc::getcwd`) and mkdir (wrapper around `libc::mkdir`) and added testing.

A few notes:

 - I'm new to rust so I would appreciate some pair of eyes testing the code, plus I'm open for revision of code or general remarks about my coding style
 - I have run the tests both on OSX as on Linux (Ubuntu)
 - I've run `clippy` to see if my code is well formatted, however clippy issues many warnings about the project. I think I didn't add any more warnings
 - the methods in unistd are not documented so I also left out the documentation of `getcwd` and `mkdir`, although I think it'd probably be good to add some documentation, especially some example code how to use the methods
 - the base idea of `getcwd` is [taken from std](https://github.com/rust-lang/rust/blob/1.9.0/src/libstd/sys/unix/os.rs#L95-L119), should I mention that somewhere?
This was referenced Sep 7, 2016
@philippkeller
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Yay, thanks a lot @posborne for the helpful comments and the merge. I'm feeling proud - that was my first bigger PR into a rust project

@fiveop
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fiveop commented Sep 8, 2016

Thank you!

Could you add entries to the CHANGELOG.md detailing your changes? Preferably before we cut the release.

philippkeller added a commit to philippkeller/nix that referenced this pull request Sep 9, 2016
homu added a commit that referenced this pull request Sep 9, 2016
Update CHANGELOG for pull request 416

As [requested by @fiveop](#416 (comment))
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4 participants