refactor(bare): enhance security and performance optimizations

- Remove unnecessary sorting in advertise_refs for deterministic output
- Add path traversal detection and validation in bare_dir construction
- Implement symlink resolution checks to prevent security vulnerabilities
- Refactor cache system with CRC validation and improved metrics
- Integrate repo-specific cache invalidation using indexed keys
- Add comprehensive unit tests for commit operations and diff functionality
- Move configuration constants to centralized config module
- Optimize string operations in disk cache random value generation
- Enhance license detection algorithm with cleaner matching logic
- Streamline argument processing in various git operations
- Update dependencies including crc32fast and flate2 for performance
- Add signal handling capability to tokio runtime configuration

pack/index_pack.rs

@@ -18,7 +18,6 @@ impl GitBare {
         let pack_dir = self.bare_dir.join("objects").join("pack");
         std::fs::create_dir_all(&pack_dir).map_err(GitError::Io)?;
 
-        // Stream pack data to a temp file instead of accumulating in memory
         let mut tmp_file = tempfile::Builder::new()
             .prefix("tmp_index_pack_")
             .tempfile_in(&pack_dir)
@@ -41,7 +40,6 @@ impl GitBare {
             return Err(GitError::InvalidArgument("empty pack data".into()));
         }
 
-        // Flush and get the path before we pass it to git
         tmp_file.flush().map_err(GitError::Io)?;
         let tmp_path = tmp_file.path().to_path_buf();
 
@@ -64,7 +62,6 @@ impl GitBare {
             .unchecked()
             .run()?;
 
-        // Drop the temp file handle — git index-pack has processed it
         drop(tmp_file);
 
         if !result.status.success() {
@@ -74,7 +71,6 @@ impl GitBare {
             });
         }
 
-        // Parse the output to extract the pack hash
         let output = String::from_utf8_lossy(&result.stdout);
         let stderr = String::from_utf8_lossy(&result.stderr);
         let all_output = format!("{output}\n{stderr}");
@@ -96,7 +92,6 @@ impl GitBare {
             })
             .next();
 
-        // Try to get object count from .idx if it exists
         let mut object_count = 0u64;
         if let Some(ref hash) = pack_hash {
             let idx_path = pack_dir.join(format!("pack-{hash}.idx"));