Add std::os::unix::fs::chroot to change the root directory of the current process #84716

joshtriplett · 2021-04-29T20:51:12Z

This is a straightforward wrapper that uses the existing helpers for C
string handling and errno handling.

Having this available is convenient for UNIX utility programs written in
Rust, and avoids having to call the unsafe libc::chroot directly and
handle errors manually, in a program that may otherwise be entirely safe
code.

rust-highfive · 2021-04-29T20:51:15Z

r? @m-ou-se

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dtolnay

Seems good to me! :)

dtolnay · 2021-04-29T21:05:33Z

@bors r+

bors · 2021-04-29T21:05:34Z

📌 Commit 2fb2f0b has been approved by dtolnay

Add std::os::unix::fs::chroot to change the root directory of the current process This is a straightforward wrapper that uses the existing helpers for C string handling and errno handling. Having this available is convenient for UNIX utility programs written in Rust, and avoids having to call the unsafe `libc::chroot` directly and handle errors manually, in a program that may otherwise be entirely safe code.

jackh726 · 2021-04-29T21:31:17Z

Failed in #84718

@bors r-

joshtriplett · 2021-04-29T21:45:20Z

Fixed the doc link.

@bors r=dtolnay rollup

bors · 2021-04-29T21:45:21Z

📌 Commit 3b414c3 has been approved by dtolnay

dtolnay · 2021-04-29T21:46:59Z

library/std/src/sys/unix/ext/fs.rs

+/// This typically requires privileges, such as root or a specific capability.
+///
+/// This does not change the current working directory; you should call
+/// [`std::env::set_current_dir`][`crate::env::set_current_dir`] afterwards.


Adding extern crate self as std; in std's lib.rs would avoid having to do the link target explicitly here (and definitely elsewhere too).

According to @jyn514, doing that currently produces an ICE.

This is #73445. I haven't tried it in a while, it may work now.

Also, you can shorten a bit like so:

Suggested change

/// [`std::env::set_current_dir`][`crate::env::set_current_dir`] afterwards.

/// [`std::env::set_current_dir`](crate::env::set_current_dir) afterwards.

If you go the extern crate route, you might want to do

#[cfg(doc)] extern crate self as std;

to ensure it's only used for docs.

@camelid that will break any links that are re-exported, cfg(doc) isn't set for dependencies.

I haven't tried it in a while, it may work now.

Just tried it, extern crate self as core works but not extern crate self as std (#84755, #73445 (comment)).

Add std::os::unix::fs::chroot to change the root directory of the current process This is a straightforward wrapper that uses the existing helpers for C string handling and errno handling. Having this available is convenient for UNIX utility programs written in Rust, and avoids having to call the unsafe `libc::chroot` directly and handle errors manually, in a program that may otherwise be entirely safe code.

bors · 2021-04-30T05:37:26Z

⌛ Testing commit eda658dc7c95c69e8c1f7191b0ba7bebb6e6be2e with merge fe71c7f6e0f60886eff3b39268916552115b74e1...

bors · 2021-04-30T05:57:51Z

💔 Test failed - checks-actions

joshtriplett · 2021-04-30T06:17:15Z

Well, that's interesting. Either Fuchsia doesn't have chroot, or libc isn't providing a binding to it. I'll investigate.

cc @tmandry for Fuchsia.

joshtriplett · 2021-04-30T06:37:21Z

The answer appears to be that Fuchsia doesn't have chroot. I'll add a cfg.

…rent process This is a straightforward wrapper that uses the existing helpers for C string handling and errno handling. Having this available is convenient for UNIX utility programs written in Rust, and avoids having to call the unsafe `libc::chroot` directly and handle errors manually, in a program that may otherwise be entirely safe code.

joshtriplett · 2021-04-30T07:11:44Z

@bors try

bors · 2021-04-30T07:11:53Z

⌛ Trying commit ffb874a with merge 7ede84235ed7c851bb5bc27e1f7d6f438d6b78d5...

bors · 2021-04-30T08:01:46Z

☀️ Try build successful - checks-actions
Build commit: 7ede84235ed7c851bb5bc27e1f7d6f438d6b78d5 (7ede84235ed7c851bb5bc27e1f7d6f438d6b78d5)

joshtriplett · 2021-04-30T11:24:54Z

@bors r=dtolnay rollup=never

bors · 2021-04-30T11:24:55Z

📌 Commit ffb874a has been approved by dtolnay

bors · 2021-04-30T12:19:41Z

⌛ Testing commit ffb874a with merge 7506228...

bors · 2021-04-30T14:39:21Z

☀️ Test successful - checks-actions
Approved by: dtolnay
Pushing 7506228 to master...

Fix `vxworks` Some PRs made the `vxworks` target not build anymore. This PR fixes that: - rust-lang#82973: copy `ExitStatusError` implementation from `unix`. - rust-lang#84716: no `libc::chroot` available on `vxworks`, so for now don't implement `os::unix::fs::chroot`.

rust-highfive assigned m-ou-se Apr 29, 2021

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Tracking Issue for feature(unix_chroot) #84715

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joshtriplett added O-unix Operating system: Unix-like T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. Libs-Small Libs issues that are considered "small" or self-contained labels Apr 29, 2021

dtolnay approved these changes Apr 29, 2021

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jackh726 mentioned this pull request Apr 29, 2021

Rollup of 11 pull requests #84718

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bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Apr 29, 2021

joshtriplett force-pushed the chroot branch from 2fb2f0b to 3b414c3 Compare April 29, 2021 21:42

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Rollup of 11 pull requests #84726

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joshtriplett force-pushed the chroot branch from eda658d to ffb874a Compare April 30, 2021 07:11

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bors merged commit 7506228 into rust-lang:master Apr 30, 2021

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bors mentioned this pull request Apr 30, 2021

Move all sys::ext modules to os #84200

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anp mentioned this pull request May 4, 2021

Fuchsia's target_family should be None, not "unix" #58590

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CDirkx mentioned this pull request May 19, 2021

Fix vxworks #85490

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Add std::os::unix::fs::chroot to change the root directory of the current process #84716

Add std::os::unix::fs::chroot to change the root directory of the current process #84716

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	/// [`std::env::set_current_dir`][`crate::env::set_current_dir`] afterwards.
	/// [`std::env::set_current_dir`](crate::env::set_current_dir) afterwards.

Add std::os::unix::fs::chroot to change the root directory of the current process #84716

Add std::os::unix::fs::chroot to change the root directory of the current process #84716

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