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Windows: Use FindFirstFileW for getting the metadata of locked system files #98916

Merged
merged 5 commits into from
Jul 20, 2022
Merged

Windows: Use FindFirstFileW for getting the metadata of locked system files #98916

merged 5 commits into from
Jul 20, 2022

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ChrisDenton
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Fixes #96980

Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as C:\hiberfil.sys, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.

Note that the test is a bit iffy. I don't know if hiberfil.sys actually exists in the CI.

r? rust-lang/libs

@ChrisDenton
impl From<c::WIN32_FIND_DATAW> for FileAttr
13ab796
@ChrisDenton
Windows: Use FindFirstFileW if metadata fails
8d4adad 
Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.
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rustbot commented Jul 5, 2022

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

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  • Changing public documentation in ways that create new stability guarantees
  • Changing observable runtime behavior of library APIs

@rustbot rustbot added the T-libs Relevant to the library team, which will review and decide on the PR/issue. label Jul 5, 2022
@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 5, 2022
bjorn3
bjorn3 reviewed Jul 5, 2022
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library/std/src/fs/tests.rs Outdated Show resolved Hide resolved
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strega-nil-ms commented Jul 8, 2022 •
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This is, as far as I can tell, equivalent to the code in the Microsoft STL: https://github.com/microsoft/STL/blob/062002644137095c606f0a5a11d04f0278e8632e/stl/src/filesystem.cpp#L794

(and so is likely to be correct)

thomcc
thomcc reviewed Jul 17, 2022
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Sorry it took so long to get to this. This looks good to me.

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thomcc commented Jul 17, 2022

@bors r+

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bors commented Jul 17, 2022

📌 Commit 5f5bcb3 has been approved by thomcc

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 Jul 17, 2022
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Jul 18, 2022
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Rollup merge of rust-lang#98916 - ChrisDenton:hiberfil.sys, r=thomcc
03f81bf 
Windows: Use `FindFirstFileW` for getting the metadata of locked system files

Fixes rust-lang#96980

Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.

Note that the test is a bit iffy. I don't know if `hiberfil.sys` actually exists in the CI.

r? rust-lang/libs
@Dylan-DPC Dylan-DPC mentioned this pull request Jul 18, 2022
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Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Jul 18, 2022
@Dylan-DPC
Rollup merge of rust-lang#98916 - ChrisDenton:hiberfil.sys, r=thomcc
3841b58 
Windows: Use `FindFirstFileW` for getting the metadata of locked system files

Fixes rust-lang#96980

Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.

Note that the test is a bit iffy. I don't know if `hiberfil.sys` actually exists in the CI.

r? rust-lang/libs
@Dylan-DPC Dylan-DPC mentioned this pull request Jul 18, 2022
Closed
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Jul 18, 2022
@Dylan-DPC
Rollup merge of rust-lang#98916 - ChrisDenton:hiberfil.sys, r=thomcc
b6bc9e7 
Windows: Use `FindFirstFileW` for getting the metadata of locked system files

Fixes rust-lang#96980

Usually opening a file handle with access set to metadata only will always succeed, even if the file is locked. However some special system files, such as `C:\hiberfil.sys`, are locked by the system in a way that denies even that. So as a fallback we try reading the cached metadata from the directory.

Note that the test is a bit iffy. I don't know if `hiberfil.sys` actually exists in the CI.

r? rust-lang/libs
@Dylan-DPC Dylan-DPC mentioned this pull request Jul 18, 2022
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@bors r- failed in rollup

Oh, I was afraid of this. hiberfil.sys doesn't exist in CI. Hm, maybe we could keep the test but mark it as ignore? Admittedly it not running in CI very much limits its utility but at least it can be run locally.

@bors 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 Jul 18, 2022
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thomcc commented Jul 18, 2022

Oof, I thought about marking it as rollup=never for that reason (I guess doing a try run would have been more prudent...)

Marking the test as ignore makes sense to me.

@ChrisDenton
Ignore hiberfil_sys test in CI
eee8ca9 
The file it's testing does not exist in the CI environment.
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thomcc commented Jul 18, 2022

It seems a bit goofy to do a try run now that the test is ignored, so I'll just reapprove.

@bors r+

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bors commented Jul 18, 2022

📌 Commit eee8ca9 has been approved by thomcc

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 18, 2022
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failed in rollup

@bors r-

@bors 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 Jul 18, 2022
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Sorry, we already noticed that and addressed the issue.

@bors r=thomcc

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bors commented Jul 18, 2022

📌 Commit eee8ca9 has been approved by thomcc

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Jul 18, 2022
@Dylan-DPC Dylan-DPC mentioned this pull request Jul 20, 2022
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bors added a commit to rust-lang-ci/rust that referenced this pull request Jul 20, 2022
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Auto merge of rust-lang#99493 - Dylan-DPC:rollup-lli4gcx, r=Dylan-DPC
748cb1f 
Rollup of 5 pull requests

Successful merges:

 - rust-lang#98784 (Suggest returning local on "expected `ty`, found `()`" due to expr-less block)
 - rust-lang#98916 (Windows: Use `FindFirstFileW` for getting the metadata of locked system files)
 - rust-lang#99433 (Erase regions before comparing signatures of foreign fns.)
 - rust-lang#99452 (int_macros was only using to_xe_bytes_doc and not from_xe_bytes_doc)
 - rust-lang#99481 (Add regression test for rust-lang#71547)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 8039567 into rust-lang:master Jul 20, 2022
@rustbot rustbot added this to the 1.64.0 milestone Jul 20, 2022
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[fs] Path::new(r#"C:\hiberfil.sys"#).exists() returns false, despite the file existing
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