fix(tsunpacker): use synchronous fs operations in tsunpacker to avoid readdir race conditions

changelog.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## 2026-03-05 - 4.1.17 - fix(tsunpacker)
+use synchronous fs operations in tsunpacker to avoid readdir race conditions
+
+- Replaced async fs.promises.readdir/rename/rm/rmdir loops with fs.readdirSync/renameSync/rmSync/rmdirSync
+- Removed readdir retry loops that attempted to handle partial/stale readdir results
+- Updated comment to document rationale: avoid race conditions under signal pressure and XFS metadata lag
+- Note: function remains async but now performs blocking sync filesystem calls which may block the event loop during unpack
+
 ## 2026-03-05 - 4.1.16 - fix(mod_unpack)
 handle partial readdir results from signal-interrupted getdents64 when unpacking to ensure sibling removal and nested moves complete
 

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tsbuild',
-  version: '4.1.16',
+  version: '4.1.17',
   description: 'A tool for compiling TypeScript files using the latest nightly features, offering flexible APIs and a CLI for streamlined development.'
 }

ts/mod_unpack/classes.tsunpacker.ts

@@ -90,9 +90,9 @@ export class TsUnpacker {
    * 2. Moving contents of the nested source folder up to the dest dir
    * 3. Removing the now-empty nested source folder
    *
-   * This approach never creates temporary sibling directories and never
-   * removes the destination directory itself, avoiding filesystem race
-   * conditions observed with the previous rename-rm-rename pattern.
+   * Uses synchronous fs operations to avoid race conditions with
+   * async readdir returning partial/stale results under signal pressure
+   * or XFS metadata lag (observed in process-group environments like gitzone).
    *
    * Returns true if unpacking was performed, false if skipped.
    */
@@ -108,32 +108,24 @@ export class TsUnpacker {
     const nestedPath = this.getNestedPath();
 
     // Step 1: Remove sibling entries (everything in dest except the source folder)
-    // Loop handles partial readdir results from signal-interrupted getdents64
-    let destEntries = await fs.promises.readdir(this.destDir);
-    while (destEntries.some(e => e !== this.sourceFolderName)) {
-      for (const entry of destEntries) {
-        if (entry !== this.sourceFolderName) {
-          await fs.promises.rm(path.join(this.destDir, entry), { recursive: true, force: true });
-        }
+    const destEntries = fs.readdirSync(this.destDir);
+    for (const entry of destEntries) {
+      if (entry !== this.sourceFolderName) {
+        fs.rmSync(path.join(this.destDir, entry), { recursive: true, force: true });
       }
-      destEntries = await fs.promises.readdir(this.destDir);
     }
 
     // Step 2: Move all contents from nested dir up to dest dir
-    // Loop handles partial readdir results from signal-interrupted getdents64
-    let nestedEntries = await fs.promises.readdir(nestedPath);
-    while (nestedEntries.length > 0) {
-      for (const entry of nestedEntries) {
-        await fs.promises.rename(
-          path.join(nestedPath, entry),
-          path.join(this.destDir, entry),
-        );
-      }
-      nestedEntries = await fs.promises.readdir(nestedPath);
+    const nestedEntries = fs.readdirSync(nestedPath);
+    for (const entry of nestedEntries) {
+      fs.renameSync(
+        path.join(nestedPath, entry),
+        path.join(this.destDir, entry),
+      );
     }
 
     // Step 3: Remove the now-empty nested directory
-    await fs.promises.rmdir(nestedPath);
+    fs.rmdirSync(nestedPath);
 
     return true;
   }