nushell: chmod functionality

[KAAtheWiseGit]

Both mkdir and install seem to use their own slightly different version of the chmod function. And neither have the detailed logic of the chmod crate. Should there be a function chmod function in uucore? Or is there a reason to keep them separate?

[tertsdiepraam]

Let's see. I assume your talking about these parts:

https://github.com/uutils/coreutils/blob/main/src/uu/install/src/mode.rs (the whole file)

and

coreutils/src/uu/mkdir/src/mkdir.rs

Lines 163 to 178 in 2789885

	#[cfg(any(unix, target_os = "redox"))]
	fn chmod(path: &Path, mode: u32) -> UResult<()> {
	use std::fs::{set_permissions, Permissions};
	use std::os::unix::fs::PermissionsExt;
	let mode = Permissions::from_mode(mode);
	set_permissions(path, mode)
	.map_err_context(|| format!("cannot set permissions {}", path.quote()))
	}
	#[cfg(windows)]
	fn chmod(_path: &Path, _mode: u32) -> UResult<()> {
	// chmod on Windows only sets the readonly flag, which isn't even honored on directories
	Ok(())
	}

and I guess also this function from chmod:

coreutils/src/uu/chmod/src/chmod.rs

Line 389 in 2789885

fn change_file(&self, fperm: u32, mode: u32, file: &Path) -> Result<(), i32> {

Additionally they all have some code for parsing the mode.

---

Yeah, I think it would be nice to combine these as much as possible! As long as they really are compatible and don't use, for example, slightly different formats for the mode.

[KAAtheWiseGit]

I went into the GNU's coreutils source, and here is what I found:

mkdir, install, and chmod use mode_adjust from modechange.h from gnulib to handle file modes. So, at least the core logic should be the same. I am trying to discern the high-level logic at the moment.

And I also found this, which is just delightful:

mkdir -p --mode=... only applies the mode to the right-most directory. Any parent directories are created with 'u+wx' modified by umask. If you want to control the mode for all created dirs, you can use a umask like (umask u=rwx,go=rx; mkdir -p dir1/dir2/dir3).

[tertsdiepraam]

I went into the GNU's coreutils source

Please don't do that. We can't base our code on GNU's code directly, because of license reasons. We have to base our implementation on the output, tests and documentation.

[KAAtheWiseGit]

Got it. Somewhat thankfully, I couldn't figure it out, so I went to the documentation.