fix: maintain unix file permissions from file read to zip options (#14)

src/cli/pack.ts

@@ -1,5 +1,6 @@
 import { confirm } from "@inquirer/prompts";
 import { createHash } from "crypto";
+import type { Zippable } from "fflate";
 import { zipSync } from "fflate";
 import {
   existsSync,
@@ -140,8 +141,9 @@ export async function packExtension({
     >();
     const shallowFiles: Array<{ path: string; size: number }> = [];
 
-    for (const [filePath, content] of fileEntries) {
+    for (const [filePath, fileData] of fileEntries) {
       const relPath = relative(resolvedPath, filePath);
+      const content = fileData.data;
       const size =
         typeof content === "string"
           ? Buffer.byteLength(content, "utf8")
@@ -184,8 +186,26 @@ export async function packExtension({
       }
     }
 
-    // Create zip
-    const zipData = zipSync(files, {
+    // Create zip with preserved file permissions
+    const zipFiles: Zippable = {};
+
+    const isUnix = process.platform !== "win32";
+
+    for (const [filePath, fileData] of Object.entries(files)) {
+      if (isUnix) {
+        // Set external file attributes to preserve Unix permissions
+        // The mode needs to be shifted to the upper 16 bits for ZIP format
+        zipFiles[filePath] = [
+          fileData.data,
+          { os: 3, attrs: (fileData.mode & 0o777) << 16 },
+        ];
+      } else {
+        // On Windows, use default ZIP attributes (no Unix permissions)
+        zipFiles[filePath] = fileData.data;
+      }
+    }
+
+    const zipData = zipSync(zipFiles, {
       level: 9, // Maximum compression
       mtime: new Date(),
     });

src/node/files.ts

@@ -176,15 +176,19 @@ export function getAllFiles(
   return fileList;
 }
 
+interface FileWithPermissions {
+  data: Uint8Array;
+  mode: number;
+}
 export interface GetAllFilesResult {
-  files: Record<string, Uint8Array>;
+  files: Record<string, FileWithPermissions>;
   ignoredCount: number;
 }
 
 export function getAllFilesWithCount(
   dirPath: string,
   baseDir: string = dirPath,
-  fileList: Record<string, Uint8Array> = {},
+  fileList: Record<string, FileWithPermissions> = {},
   additionalPatterns: string[] = [],
   ignoredCount = 0,
 ): GetAllFilesResult {
@@ -213,7 +217,10 @@ export function getAllFilesWithCount(
     } else {
       // Use forward slashes in zip file paths
       const zipPath = relativePath.split(sep).join("/");
-      fileList[zipPath] = readFileSync(filePath);
+      fileList[zipPath] = {
+        data: readFileSync(filePath),
+        mode: stat.mode,
+      };
     }
   }