Added implementation on `set_permissions_nofollow` for all primary platforms by asder8215 · Pull Request #158168 · rust-lang/rust

asder8215 · 2026-06-20T06:51:38Z

For context, this PR is related to the tracking issue for std::fs::set_permissions_nofollow. This PR does a few different things:

Windows support is provided for std::fs::set_permissions_nofollow. On Windows, it uses OpenOptions::open with the custom flag FILE_FLAG_OPEN_REPARSE_POINT enabled and then sets the permissions on the reparse point directly. All other platforms (hermit, motor, solid, uefi, etc.) defer to what fs::set_permissions does since symlinks aren't supported on those platforms, so they effectively do the same thing.
The implementation for Unix was modified to use fchmodat instead of doing two separate calls (open and then fchmod via OpenOptions).
Because the previous implementations actually used fchmod instead of chmod underneath the hood (as that's what File::set_permissions, which is not to be confused with fs::set_permissions as that does use chmod, does underneath the hood), it actually had some incorrect documentation about the error returned by fchmod on symlinks. Instead of io::ErrorKind::FilesystemLoop, it returns io::ErrorKind::InvalidInput. You can read the documentation for fchmod. fchmodat does effectively the same thing as the open + fchmod combo, but it does return a different error, io::ErrorKind::Unsupported, that makes more sense. Regardless, I corrected the documentation for std::fs::set_permissions_nofollow and added a lot more clarifying information.
A test case has been added to verify if set_permissions_nofollow is operating correctly.

cc @ChrisDenton and @lolbinarycat

rustbot · 2026-06-20T06:51:42Z

r? @clarfonthey

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Owners of files modified in this PR: @ChrisDenton, libs
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clarfonthey · 2026-06-20T12:09:10Z

 }

+pub fn set_perm_nofollow(path: &Path, perm: FilePermissions) -> io::Result<()> {
+    set_perm(path, perm)


Similar to UEFI, I would swap the method bodies here, so that set_perm defers to set_perm_nofollow plus a comment that says symlinks aren't supported.

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clarfonthey · 2026-06-20T12:15:58Z

@rustbot author

CI failure appears to be a simple typo but I also left some feedback on other stuff to fix. Otherwise, implementation looks good, although I would add an extra comment on the tracking issue once this is merged to have some Windows folks double-check that opening all reparse points in this method doesn't do anything we don't want, since that technically includes more than just symlinks. It should work in pretty much all normal use cases, just want to double-check the edge cases before stabilisation.

rustbot · 2026-06-20T12:16:02Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

asder8215 · 2026-07-25T21:31:08Z

Let's try this again...

@bors try jobs=arm-android

…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms try-job: arm-android

rust-bors · 2026-07-25T23:15:04Z

☀️ Try build successful (CI)
Build commit: 5672467 (5672467fa69724956443e753fe59c3f1453ef58a)
Base parent: 008fa22 (008fa22ce3f8d3c8dfaca2e6486043c2b21851eb)

clarfonthey · 2026-07-25T23:57:11Z

@bors try

(let's just do a full run at this point. might fail due to GHA being awful today, but worth a shot)

…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms

clarfonthey · 2026-07-25T23:59:43Z

@bors try cancel

I'll poke and see what I actually need to test.

rust-bors · 2026-07-25T23:59:46Z

Try build cancelled. Cancelled workflows:

https://github.com/rust-lang/rust/actions/runs/30180313420

clarfonthey · 2026-07-26T00:02:09Z

@bors try jobs=dist-android

Eh, let's just do this one too for now. Misunderstood how try worked. Then if that passes I'll add to the queue again.

…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms try-job: dist-android

rust-bors · 2026-07-26T00:36:35Z

☀️ Try build successful (CI)
Build commit: 14aaf09 (14aaf09405c307a57e390837d3de751d64cb244e)
Base parent: 008fa22 (008fa22ce3f8d3c8dfaca2e6486043c2b21851eb)

clarfonthey · 2026-07-26T01:22:57Z

@bors r+ rollup=iffy Multitarget code that has failed us before, but hopefully shouldn't this time…

rust-bors · 2026-07-26T01:23:00Z

📌 Commit e14e3e9 has been approved by clarfonthey

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

JonathanBrouwer · 2026-07-26T10:01:17Z

💔 I suspect this PR failed tests as part of a rollup
@bors r-

After fixing the problem, consider running a try job for the failed job before re-approving.

Link to failure: #159952 (comment)

rust-bors · 2026-07-26T10:01:25Z

This pull request was unapproved.

This PR was contained in a rollup (#159952), which was unapproved.

View changes since this unapproval

ChrisDenton · 2026-07-26T11:36:10Z

On Windows you can set attributes on symlinks (they're just normal files or directories).

View changes since the review

Got you. Does setting an attribute on symlinks do anything meaningful? I was reading up on MacOS and they also can set permission bits on symlinks, but they don't do anything meaningful.

asder8215 · 2026-07-26T16:06:19Z

@bors try jobs=x86_64-msvc-1

rust-bors · 2026-07-26T18:12:26Z

💔 Test for 4e6ca17 failed: CI. Failed job:

try - x86_64-msvc-1 (web logs, enhanced plaintext logs)

asder8215 · 2026-07-26T18:15:34Z

Okay, that confirms to me that Windows actually sets permissions on the symlink_dir(the BSD-based platforms we asserted false on readonly()).

…pported (windows, unix, uefi, etc.); modified the Unix implementation to use fchmodat instead of open + fchmod; clarified documentations for set_permissions_nofollow; added a test case for set_permissions_nofollow

asder8215 · 2026-07-26T18:34:59Z

@bors try jobs=x86_64-msvc-1

rust-bors · 2026-07-26T18:35:05Z

⌛ Trying commit b319483 with merge a576dd2…

To cancel the try build, run the command @bors try cancel.

Workflow: https://github.com/rust-lang/rust/actions/runs/30215028040

rustbot assigned clarfonthey Jun 20, 2026

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Missing variables/fields give confusing error when name is the same as a built-in attribute like start or path #86290

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rust-bors Bot pushed a commit that referenced this pull request Jul 25, 2026

Auto merge of #158168 - asder8215:windows_set_permissions_nofollow, r…

5672467

…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms try-job: arm-android

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Auto merge of #158168 - asder8215:windows_set_permissions_nofollow, r…

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…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms

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rust-bors Bot pushed a commit that referenced this pull request Jul 26, 2026

Auto merge of #158168 - asder8215:windows_set_permissions_nofollow, r…

14aaf09

…=<try> Added implementation on `set_permissions_nofollow` for all primary platforms try-job: dist-android

rust-bors Bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 26, 2026

JonathanBrouwer mentioned this pull request Jul 26, 2026

Rollup of 25 pull requests #159952

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asder8215 mentioned this pull request Jul 26, 2026

Implemented different with_native_path conversion methods, refactoring fs functions to utilize with_native_path, and move exists to use with_native_path #159805

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