simplify cached tarball data structure for intended usage

signal-gateway-code-tool/src/cached.rs

@@ -2,7 +2,7 @@
 
 use flate2::read::GzDecoder;
 use globset::GlobSet;
-use std::{collections::HashMap, io::Read};
+use std::{collections::BTreeMap, io::Read};
 use tar::Archive;
 use tracing::info;
 
@@ -27,8 +27,8 @@ impl CachedFile {
 pub struct CachedTarball {
     /// The git SHA this tarball corresponds to.
     pub sha: String,
-    /// Map from file path to file contents.
-    pub files: HashMap<String, CachedFile>,
+    /// Map from file path to file contents (sorted by path).
+    pub files: BTreeMap<String, CachedFile>,
 }
 
 impl CachedTarball {
@@ -58,11 +58,11 @@ fn extract_files(
     tarball: &[u8],
     glob_filter: Option<&GlobSet>,
     include_non_utf8: bool,
-) -> Result<HashMap<String, CachedFile>, String> {
+) -> Result<BTreeMap<String, CachedFile>, String> {
     let decoder = GzDecoder::new(tarball);
     let mut archive = Archive::new(decoder);
 
-    let mut files = HashMap::new();
+    let mut files = BTreeMap::new();
 
     for entry in archive
         .entries()

signal-gateway-code-tool/src/lib.rs

@@ -291,15 +291,13 @@ impl CodeTool {
             .map_err(|e| format!("Invalid glob pattern: {e}"))?
             .compile_matcher();
 
-        let mut matches: Vec<&str> = cached
+        let matches: Vec<&str> = cached
             .files
             .keys()
             .filter(|path| glob.is_match(path))
             .map(|s| s.as_str())
             .collect();
 
-        matches.sort();
-
         if matches.is_empty() {
             Ok(format!("No files matching '{}'", pattern))
         } else {
@@ -371,10 +369,7 @@ impl CodeTool {
         let mut file_count = 0;
         const MAX_MATCHES: usize = 100;
 
-        let mut sorted_files: Vec<_> = cached.files.iter().collect();
-        sorted_files.sort_by_key(|(path, _)| *path);
-
-        'outer: for (path, file) in sorted_files {
+        'outer: for (path, file) in &cached.files {
             // Skip if path doesn't match prefix
             if let Some(prefix) = prefix
                 && !path.starts_with(prefix)