[Windows] Sporadic Access Is Denied. (os Error 5) On Version 3.17

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Introduction

As a developer, encountering sporadic errors can be frustrating and time-consuming to resolve. In this article, we will delve into the issue of "Access is denied. (os error 5)" on Windows version 3.17 of the tempfile package. We will explore the possible causes, review the code, and provide potential solutions to resolve this issue.

The Issue

The issue arises when attempting to use a newly created temp file after updating tempfile from version 3.16.0 to 3.17.1. The error message "Access is denied. (os error 5)" is displayed sporadically, making it challenging to identify the root cause. The issue seems to be related to the recent commit feat: delete unnamed temporary files on windows immediately.

Code Review

A thorough review of the code reveals that the issue may be related to the call to delete_open_file in the create function of the src/file/imp/windows.rs file. The delete_open_file function uses SetFileInformationByHandle to delete the file, but in cases where this call fails, the file's state may become corrupted, making it inaccessible.

Potential Causes

The potential causes of this issue are:

  • Corrupted file state: The call to delete_open_file may be corrupting the file's state, making it inaccessible.
  • Ignored errors: The errors returned by delete_open_file are being ignored, making it difficult to determine the root cause of the issue.

Proposed Solutions

To resolve this issue, we propose the following solutions:

  • Remove the call to delete_open_file: Remove the call to delete_open_file from the create function to prevent potential corruption of the file's state.
  • Allow callers to pass an argument to skip delete_open_file: Allow callers of the create function to pass an argument to skip the call to delete_open_file, giving them more control over the file creation process.

Implementation

To implement these solutions, we can modify the create function in the src/file/imp/windows.rs file as follows:

fn create(&self, dir: &str, prefix: &str, suffix: &str, delete: bool) -> Result<TempFile, io::Error> {
    // ...
    if delete {
        // Remove the call to delete_open_file
        // delete_open_file(file.handle())?;
    }
    // ...
}

Alternatively, we can add an argument to the create function to allow callers to skip the call to delete_open_file:

fn create(&self, dir: &str, prefix: &str, suffix: &str, delete: bool, skip_delete: bool) -> Result<TempFile, io::Error> {
    // ...
    if delete && !skip_delete {
        // Call delete_open_file
        delete_open_file(file.handle())?;
    }
    // ...
}

Conclusion

In conclusion, the sporadic "Access is denied. (os error 5)" issue on Windows version 3.17 of the tempfile package is likely caused by the call to delete_open_file in the create function. By removing this call or allowing callers to pass an argument to skip it, we can resolve this issue and provide a more reliable and efficient file creation experience.

Recommendations

Based on our analysis, we recommend the following:

  • Update to version 3.16.0: Revert back to version 3.16.0 of the tempfile package to resolve the issue.
  • Modify the create function: Modify the create function to remove the call to delete_open_file or add an argument to skip it.
  • Test thoroughly: Thoroughly test the modified code to ensure that the issue is resolved and that the file creation process is reliable and efficient.

Introduction

In our previous article, we explored the issue of "Access is denied. (os error 5)" on Windows version 3.17 of the tempfile package. We discussed the potential causes, reviewed the code, and proposed solutions to resolve this issue. In this article, we will provide a Q&A section to address common questions and concerns related to this issue.

Q: What is the root cause of the "Access is denied. (os error 5)" issue?

A: The root cause of the "Access is denied. (os error 5)" issue is likely related to the call to delete_open_file in the create function of the src/file/imp/windows.rs file. This call may be corrupting the file's state, making it inaccessible.

Q: Why is the error message "Access is denied. (os error 5)" displayed sporadically?

A: The error message "Access is denied. (os error 5)" is displayed sporadically because the issue is related to the call to delete_open_file in the create function. This call may be failing intermittently, causing the file's state to become corrupted and resulting in the error message.

Q: How can I resolve the "Access is denied. (os error 5)" issue?

A: To resolve the "Access is denied. (os error 5)" issue, you can modify the create function to remove the call to delete_open_file or add an argument to skip it. This will prevent the potential corruption of the file's state and resolve the issue.

Q: What are the potential consequences of ignoring the errors returned by delete_open_file?

A: Ignoring the errors returned by delete_open_file may lead to the corruption of the file's state, making it inaccessible. This can result in the "Access is denied. (os error 5)" error message being displayed sporadically.

Q: Can I revert back to version 3.16.0 of the tempfile package to resolve the issue?

A: Yes, you can revert back to version 3.16.0 of the tempfile package to resolve the issue. This will prevent the call to delete_open_file from being executed and resolve the issue.

Q: What are the benefits of modifying the create function to remove the call to delete_open_file?

A: Modifying the create function to remove the call to delete_open_file will prevent the potential corruption of the file's state and resolve the issue. This will also improve the reliability and efficiency of the file creation process.

Q: Can I add an argument to the create function to skip the call to delete_open_file?

A: Yes, you can add an argument to the create function to skip the call to delete_open_file. This will give callers more control over the file creation process and allow them to skip the call to delete_open_file if desired.

Q: How can I test the modified code to ensure that the issue is resolved?

A: To test the modified code, you can thoroughly test the file creation process to ensure that the issue is resolved. This can be done by creating multiple files and verifying that they are accessible and not corrupted.

Conclusion

In conclusion, the "Access is denied. (os error 5)" issue on Windows version 3.17 of the tempfile package is a complex issue that requires careful analysis and testing. By modifying the create function to remove the call to delete_open_file or adding an argument to skip it, we can resolve this issue and provide a more reliable and efficient file creation experience.