Fix: make sure the cache file is writable

src/constants.ts

@@ -42,9 +42,21 @@ process.once('beforeExit', async () => {
   });
 });
 
-const GLOBAL_CACHE_DIR = path.resolve(ROOT_DIR).startsWith(os.tmpdir())
-  ? os.homedir()
-  : ROOT_DIR;
+const GLOBAL_CACHE_FILE = [
+  path.resolve(ROOT_DIR),
+  os.homedir(),
+]
+  .filter((dir) => dir && !dir.startsWith(os.tmpdir()))
+  .map((dir) => path.join(dir, `${COMMAND_NAME}.cache`))
+  .sort((a, b) => (fs.existsSync(a) ? 1 : 0) - (fs.existsSync(b) ? 1 : 0))
+  .find((file) => {
+    try {
+      fsPoly.touchSync(file);
+      return true;
+    } catch {
+      return false;
+    }
+  });
 
 /**
  * A static class of constants that are determined at startup, to be used widely.
@@ -62,7 +74,7 @@ export default class Constants {
 
   static readonly GLOBAL_TEMP_DIR = GLOBAL_TEMP_DIR;
 
-  static readonly GLOBAL_CACHE_FILE = path.join(GLOBAL_CACHE_DIR, `${COMMAND_NAME}.cache`);
+  static readonly GLOBAL_CACHE_FILE = GLOBAL_CACHE_FILE;
 
   /**
    * A reasonable max of filesystem threads for operations such as:

src/polyfill/fsPoly.ts

@@ -389,6 +389,22 @@ export default class FsPoly {
     await util.promisify(fs.close)(file);
   }
 
+  static touchSync(filePath: string): void {
+    const dirname = path.dirname(filePath);
+    if (!fs.existsSync(dirname)) {
+      fs.mkdirSync(dirname, { recursive: true });
+    }
+
+    // Create the file if it doesn't already exist
+    const file = fs.openSync(filePath, 'a');
+
+    // Ensure the file's `atime` and `mtime` are updated
+    const date = new Date();
+    fs.futimesSync(file, date, date);
+
+    fs.closeSync(file);
+  }
+
   static async walk(pathLike: PathLike, callback?: FsWalkCallback): Promise<string[]> {
     let output: string[] = [];