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Make try_exists return Ok(true) for Windows Unix Sockets #116683

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merged 2 commits into from
Oct 15, 2023

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This is a follow up to #109106 but for fs::try_exists, which doesn't need to get the metadata of a file (which can fail even if a file exists).

fs::try_exists currently fails on Windows if encountering a Unix Domain Socket (UDS). This PR fixes it by checking for an error code that's returned when there's a failure to use a reparse point.

Reparse points

A reparse point is a way to invoke a filesystem filter on a file instead of the file being opened normally. This is used to implement symbolic links (by redirecting to a different path) but also to implement other types of special files such as Unix domain sockets. If the reparse point is not a link type then opening it with CreateFileW may fail with ERROR_CANT_ACCESS_FILE because the filesystem filter does not implement that operation. This differs from resolving links which may fail with errors such as ERROR_FILE_NOT_FOUND or ERROR_CANT_RESOLVE_FILENAME.

So ERROR_CANT_ACCESS_FILE means that the file exists but that we can't open it normally. Still, the file does exist on the filesystem so try_exists should report that as Ok(true).

r? libs

`fs::try_exists` currently fails on Windows if encountering a Unix Domain Socket (UDS). Fix this by checking for an error code that's returned when there's a failure to use a reparse point.

A reparse point is a way to invoke a filesystem filter on a file instead of the file being opened normally. This is used to implement symbolic links (by redirecting to a different path) but also to implement other types of special files such as Unix domain sockets. If the reparse point is not a link type then opening it with `CreateFileW` may fail with `ERROR_CANT_ACCESS_FILE` because the filesystem filter does not implement that operation. This differs from resolving links which may fail with errors such as `ERROR_FILE_NOT_FOUND` or `ERROR_CANT_RESOLVE_FILENAME`.

So `ERROR_CANT_ACCESS_FILE` means that the file exists but that we can't open it normally. Still, the file does exist so `try_exists` should report that as `Ok(true)`.
@rustbot rustbot added O-windows Operating system: Windows S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Oct 13, 2023
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@bors r+

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bors commented Oct 14, 2023

📌 Commit 2f5dea0 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

@bors bors 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-review Status: Awaiting review from the assignee but also interested parties. labels Oct 14, 2023
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bors commented Oct 15, 2023

⌛ Testing commit 2f5dea0 with merge ff5664d...

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bors commented Oct 15, 2023

☀️ Test successful - checks-actions
Approved by: Mark-Simulacrum
Pushing ff5664d to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 15, 2023
@bors bors merged commit ff5664d into rust-lang:master Oct 15, 2023
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@rustbot rustbot added this to the 1.75.0 milestone Oct 15, 2023
@ChrisDenton ChrisDenton deleted the exists branch October 15, 2023 07:42
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Finished benchmarking commit (ff5664d): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)
1.2% [0.8%, 1.9%] 4
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-3.8% [-3.8%, -3.8%] 1
All ❌✅ (primary) 1.2% [0.8%, 1.9%] 4

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 622.812s -> 624.492s (0.27%)
Artifact size: 305.53 MiB -> 305.52 MiB (-0.00%)

bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 17, 2023
54: Pull upstream master 2023 10 17 r=pietroalbini a=Veykril

* rust-lang/rust#116196
* rust-lang/rust#116824
* rust-lang/rust#116822
* rust-lang/rust#116477
* rust-lang/rust#116826
* rust-lang/rust#116820
  * rust-lang/rust#116811
  * rust-lang/rust#116808
  * rust-lang/rust#116805
  * rust-lang/rust#116800
  * rust-lang/rust#116798
  * rust-lang/rust#116754
* rust-lang/rust#114370
* rust-lang/rust#116804
  * rust-lang/rust#116802
  * rust-lang/rust#116790
  * rust-lang/rust#116786
  * rust-lang/rust#116709
  * rust-lang/rust#116430
  * rust-lang/rust#116257
  * rust-lang/rust#114157
* rust-lang/rust#116731
* rust-lang/rust#116550
* rust-lang/rust#114330
* rust-lang/rust#116724
* rust-lang/rust#116782
  * rust-lang/rust#116776
  * rust-lang/rust#115955
  * rust-lang/rust#115196
* rust-lang/rust#116775
* rust-lang/rust#114589
* rust-lang/rust#113747
* rust-lang/rust#116772
  * rust-lang/rust#116771
  * rust-lang/rust#116760
  * rust-lang/rust#116755
  * rust-lang/rust#116732
  * rust-lang/rust#116522
  * rust-lang/rust#116341
  * rust-lang/rust#116172
* rust-lang/rust#110604
* rust-lang/rust#110729
* rust-lang/rust#116527
* rust-lang/rust#116688
* rust-lang/rust#116757
  * rust-lang/rust#116753
  * rust-lang/rust#116748
  * rust-lang/rust#116741
  * rust-lang/rust#116594
* rust-lang/rust#116691
* rust-lang/rust#116643
* rust-lang/rust#116683
* rust-lang/rust#116635
* rust-lang/rust#115515
* rust-lang/rust#116742
  * rust-lang/rust#116661
  * rust-lang/rust#116576
  * rust-lang/rust#116540
* rust-lang/rust#116352
* rust-lang/rust#116737
  * rust-lang/rust#116730
  * rust-lang/rust#116723
  * rust-lang/rust#116715
  * rust-lang/rust#116603
  * rust-lang/rust#116591
  * rust-lang/rust#115439
* rust-lang/rust#116264
* rust-lang/rust#116727
  * rust-lang/rust#116704
  * rust-lang/rust#116696
  * rust-lang/rust#116695
  * rust-lang/rust#116644
  * rust-lang/rust#116630
* rust-lang/rust#116728
  * rust-lang/rust#116689
  * rust-lang/rust#116679
  * rust-lang/rust#116618
  * rust-lang/rust#116577
  * rust-lang/rust#115653
* rust-lang/rust#116702
* rust-lang/rust#116015
* rust-lang/rust#115822
* rust-lang/rust#116407
* rust-lang/rust#115719
* rust-lang/rust#115524
* rust-lang/rust#116705
* rust-lang/rust#116645
* rust-lang/rust#116233
* rust-lang/rust#115108
* rust-lang/rust#116670
* rust-lang/rust#116676
* rust-lang/rust#116666



Co-authored-by: Benoît du Garreau <bdgdlm@outlook.com>
Co-authored-by: Colin Finck <colin@reactos.org>
Co-authored-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
Co-authored-by: Joshua Liebow-Feeser <joshlf@users.noreply.github.com>
Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
Co-authored-by: Trevor Gross <tmgross@umich.edu>
Co-authored-by: Evan Merlock <evan@merlock.dev>
Co-authored-by: joboet <jonasboettiger@icloud.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: DaniPopes <57450786+DaniPopes@users.noreply.github.com>
Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com>
Co-authored-by: onur-ozkan <work@onurozkan.dev>
Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com>
Co-authored-by: The 8472 <git@infinite-source.de>
Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Co-authored-by: reez12g <reez12g@gmail.com>
Co-authored-by: Jakub Beránek <berykubik@gmail.com>
@roblabla
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This test fails on versions of windows before Windows 10 1803 (Redstone 4, April 2018 update), as those versions of windows don't have AF_UNIX support.

@ChrisDenton
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@roblabla Hm, I can add a check for if we're running in CI? I could also unconditionally skip the test if AF_UNIX fails but I'm more reluctant to do that as it may mask a problem with the test.

matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Oct 22, 2023
…rk-Simulacrum

Skip test if Unix sockets are unsupported

Fixes rust-lang#116683 (comment)

The test will be skipped if `AF_UNIX` is not supported. In that case [`WSASocketW` returns `WSAEAFNOSUPPORT`](https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsasocketw#return-value).

It will never skip the test when run in CI but maybe this is me being too defensive since the error code is narrowly scoped to just the af family parameter being unsupported?

Also fixed a minor typo.

r? `@Mark-Simulacrum`
rust-timer added a commit to rust-lang-ci/rust that referenced this pull request Oct 22, 2023
Rollup merge of rust-lang#116989 - ChrisDenton:skip-unsupported, r=Mark-Simulacrum

Skip test if Unix sockets are unsupported

Fixes rust-lang#116683 (comment)

The test will be skipped if `AF_UNIX` is not supported. In that case [`WSASocketW` returns `WSAEAFNOSUPPORT`](https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-wsasocketw#return-value).

It will never skip the test when run in CI but maybe this is me being too defensive since the error code is narrowly scoped to just the af family parameter being unsupported?

Also fixed a minor typo.

r? `@Mark-Simulacrum`
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