Restore previous errno after post command hook - #860
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derrickstolee
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Thanks for finding and fixing this!
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dscho
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sigh Those PR builds have long passed, but apparently there's yet another glitch that prevents webhooks or notifications from being delivered. |
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I had to elevate to admin to "bypass" the "missing" check prerequisite. |
dscho
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Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
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Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
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Apr 17, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
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Apr 20, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
added a commit
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Apr 20, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
added a commit
that referenced
this pull request
Apr 20, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
added a commit
that referenced
this pull request
Jun 12, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
added a commit
that referenced
this pull request
Jun 12, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
dscho
added a commit
that referenced
this pull request
Jun 17, 2026
Test and fix for #859 : Repro steps: In a repository where post-command hook is configured (such as a VFSForGit clone) 1. Configure autocorrect: `git config help.autocorrect=prompt` 2. Run an misspelled command. For example, `git statuss` Expected output: ``` WARNING: You called a Git command named 'statuss', which does not exist. Run 'status' instead [y/N]? ``` Actual output: ``` failed to run command 'statuss': No error ``` I think the problem is that [run_post_command_hook](https://github.com/microsoft/git/blob/9db3c15f497c5d59a20bb2ff4d054ff687d08334/git.c#L503C1-L503C26) needs to save and restore errno, similar to how handle_alias does it. Otherwise, the errno from the failed command is overwritten by the successful errno from postcommand hook before the help autocorrect has a chance to examine it.
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Test and fix for #859