Subject: Re: [PATCH v3 2/3] libgit-rs: add get_bool() method to ConfigSet

From: Phillip Wood <[email-masked]>
Date: Mon, 29 Sep 2025 14:23:48 +0100

On 27/09/2025 04:51, ionnss via GitGitGadget wrote:
> From: ionnss <[email-masked]>
> 
> Add support for parsing boolean configuration values using Git's
> git_configset_get_bool() C function. This ensures consistent behavior
> with Git's native boolean parsing logic.
> 
> The method handles all Git boolean formats (true/false, yes/no, on/off,
> 1/0) and edge cases like "00" and "100" correctly.
>  
> Includes comprehensive tests for various boolean formats and edge cases.

Unfortunately when I try to run those tests with

    make INCLUDE_LIBGIT_RS=1 && cd contrib/libgit-rs && cargo test

I see

   = note: /usr/bin/ld: 
/home/phil/src/git/update-ref-date/contrib/libgit-rs/target/debug/deps/libgit-8c021564b9d1ec26.9j3smxv8a5f6u8czhaxq401mn.rcgu.o: 
in function `libgit::config::ConfigSet::get_bool':
  
/home/phil/src/git/update-ref-date/contrib/libgit-rs/src/config.rs:78: 
undefined reference to `libgit_configset_get_bool'
           collect2: error: ld returned 1 exit status

This happens because libgit_configset_get_bool() is not defined in 
contrib/libgit-sys/public_symbol_export.[ch]. You need to wrap 
configset_get_bool() in the some way that configset_get_int() is.

Thanks

Phillip

> Signed-off-by: ionnss <[email-masked]>
> ---
>   contrib/libgit-rs/src/config.rs    | 26 ++++++++++++++++++++++++++
>   contrib/libgit-rs/testdata/config3 |  2 +-
>   contrib/libgit-rs/testdata/config4 |  9 +++++++++
>   contrib/libgit-sys/src/lib.rs      |  6 ++++++
>   4 files changed, 42 insertions(+), 1 deletion(-)
>   create mode 100644 contrib/libgit-rs/testdata/config4
> 
> diff --git a/contrib/libgit-rs/src/config.rs b/contrib/libgit-rs/src/config.rs
> index 6bf04845c8..72ee88801b 100644
> --- a/contrib/libgit-rs/src/config.rs
> +++ b/contrib/libgit-rs/src/config.rs
> @@ -68,6 +68,20 @@ impl ConfigSet {
>               Some(owned_str)
>           }
>       }
> +
> +    /// Load the value for the given key and attempt to parse it as a boolean. Dies with a fatal error
> +    /// if the value cannot be parsed. Returns None if the key is not present.
> +    pub fn get_bool(&mut self, key: &str) -> Option<bool> {
> +        let key = CString::new(key).expect("config key should be valid CString");
> +        let mut val: c_int = 0;
> +        unsafe {
> +            if libgit_configset_get_bool(self.0, key.as_ptr(), &mut val as *mut c_int) != 0 {
> +                return None;
> +            }
> +        }
> +
> +        Some(val != 0)
> +    }
>   }
>   
>   impl Default for ConfigSet {
> @@ -95,6 +109,7 @@ mod tests {
>               Path::new("testdata/config1"),
>               Path::new("testdata/config2"),
>               Path::new("testdata/config3"),
> +            Path::new("testdata/config4"),
>           ]);
>           // ConfigSet retrieves correct value
>           assert_eq!(cs.get_int("trace2.eventTarget"), Some(1));
> @@ -102,5 +117,16 @@ mod tests {
>           assert_eq!(cs.get_int("trace2.eventNesting"), Some(3));
>           // ConfigSet returns None for missing key
>           assert_eq!(cs.get_string("foo.bar"), None);
> +        // Test boolean parsing - comprehensive tests
> +        assert_eq!(cs.get_bool("test.boolTrue"), Some(true));
> +        assert_eq!(cs.get_bool("test.boolFalse"), Some(false));
> +        assert_eq!(cs.get_bool("test.boolYes"), Some(true));
> +        assert_eq!(cs.get_bool("test.boolNo"), Some(false));
> +        assert_eq!(cs.get_bool("test.boolOne"), Some(true));
> +        assert_eq!(cs.get_bool("test.boolZero"), Some(false));
> +        assert_eq!(cs.get_bool("test.boolZeroZero"), Some(false)); // "00" → false
> +        assert_eq!(cs.get_bool("test.boolHundred"), Some(true)); // "100" → true
> +        // Test missing boolean key
> +        assert_eq!(cs.get_bool("missing.boolean"), None);
>       }
>   }
> diff --git a/contrib/libgit-rs/testdata/config3 b/contrib/libgit-rs/testdata/config3
> index ca7b9a7c38..3ea5b96f12 100644
> --- a/contrib/libgit-rs/testdata/config3
> +++ b/contrib/libgit-rs/testdata/config3
> @@ -1,2 +1,2 @@
>   [trace2]
> -	eventNesting = 3
> +	eventNesting = 3
> \ No newline at end of file
> diff --git a/contrib/libgit-rs/testdata/config4 b/contrib/libgit-rs/testdata/config4
> new file mode 100644
> index 0000000000..c0755a32be
> --- /dev/null
> +++ b/contrib/libgit-rs/testdata/config4
> @@ -0,0 +1,9 @@
> +[test]
> +	boolTrue = true
> +	boolFalse = false
> +	boolYes = yes
> +	boolNo = no
> +	boolOne = 1
> +	boolZero = 0
> +	boolZeroZero = 00
> +	boolHundred = 100
> diff --git a/contrib/libgit-sys/src/lib.rs b/contrib/libgit-sys/src/lib.rs
> index 4bfc650450..b104fda8f6 100644
> --- a/contrib/libgit-sys/src/lib.rs
> +++ b/contrib/libgit-sys/src/lib.rs
> @@ -43,6 +43,12 @@ extern "C" {
>           dest: *mut *mut c_char,
>       ) -> c_int;
>   
> +    pub fn libgit_configset_get_bool(
> +        cs: *mut libgit_config_set,
> +        key: *const c_char,
> +        dest: *mut c_int,
> +    ) -> c_int;
> +
>   }
>   
>   #[cfg(test)]