There's a lot of subtleties to these APIs. First,
unlike the `xattrs` crate, we operate on cap-std `Dir`
objects. As part of that, we also explicitly error
out on absolute paths, as well as paths containing
any uplinks (`../`) at all.

- Always use `/proc/self/fd` with `lgetxattr`
  because this is the only way to get/set xattrs on
  symlinks.
- Return a `Result<Option<>>` with getxattr for
  consistency with our other APIs to handle the
  common case of looking for a nonexistent xattr.
- The `getxattr` and `listxattr` APIs are also higher level than
  what Rustix offers to be maximally convenient;
  we always return an owned buffer, and handle
  resizing it.

Signed-off-by: Colin Walters <[email protected]>

I think this got cargo culted from elsewhere; where necessary
I believe the status quo is to use `#![cfg(docsrs)]` or so.

This squashes a build warning.

Signed-off-by: Colin Walters <[email protected]>

lib: Drop unused feature

dirext: Add getxattr/setxattr wrappers

Also update documentation.

Signed-off-by: Etienne Champetier <[email protected]>

dirext: make atomic_* really atomic

Since we regressed here recently.

Until we can debug what the issue might be. It looks
to me like the `tempfile` crate has special logic here
https://github.com/Stebalien/tempfile/blob/0657fdf24925287e6d5544d9e321a48d7ceaafdc/src/file/imp/windows.rs#L92

But we're just relying on cap-std, and we need to dig to
see if there's something similar or it needs changes.

Properly feature gate rustix-based functions

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

This came up in a bootc PR that would have been cleaner
with this.

Signed-off-by: Colin Walters <[email protected]>

dirext: Add APIs to read whole contents optionally

We have this in bootc, but it's generally useful.

Signed-off-by: Colin Walters <[email protected]>

cmdext: Add prctl wrapper

…checkout-5

build(deps): bump actions/checkout from 4 to 5

Release 4.0.7