adding unit test by programmatically create symlinks during test case…

… (same approach as has been taken for filesystem UT already)

package.json

@@ -28,7 +28,7 @@
     "mocha": "xvfb-maybe electron-mocha --reporter spec && mocha --reporter spec",
     "test": "yarn lint && yarn mocha",
     "lint": "yarn prettier:check",
-    "prettier": "prettier \"src/**/*.ts\" \"test/**/*.ts\" \"test/**/*.js\"",
+    "prettier": "prettier \"src/**/*.ts\" \"test/**/*.js\"",
     "prettier:check": "yarn prettier --check",
     "prettier:write": "yarn prettier --write",
     "prepare": "tsc"

src/asar.ts

@@ -142,7 +142,7 @@ export async function createPackageFromFiles(
     const file = metadata[filename];
 
     const shouldUnpackPath = function (
-      relativeDirPath: string,
+      relativePath: string,
       unpack: string | undefined,
       unpackDir: string | undefined,
     ) {
@@ -151,7 +151,7 @@ export async function createPackageFromFiles(
         shouldUnpack = minimatch(filename, unpack, { matchBase: true });
       }
       if (!shouldUnpack && unpackDir) {
-        shouldUnpack = isUnpackedDir(relativeDirPath, unpackDir, unpackDirs);
+        shouldUnpack = isUnpackedDir(relativePath, unpackDir, unpackDirs);
       }
       return shouldUnpack;
     };
@@ -172,7 +172,7 @@ export async function createPackageFromFiles(
         return filesystem.insertFile(filename, shouldUnpack, file, options);
       case 'link':
         shouldUnpack = shouldUnpackPath(
-          path.relative(src, path.dirname(filename)),
+          path.relative(src, filename),
           options.unpack,
           options.unpackDir,
         );

src/disk.ts

@@ -61,7 +61,17 @@ const writeFileListToStream = async function (
     // the symlink needs to be recreated outside in .unpacked
     const filename = path.relative(filesystem.getRootPath(), file.filename);
     const link = await fs.readlink(file.filename);
-    await fs.symlink(link, path.join(`${dest}.unpacked`, filename));
+    // if symlink is within subdirectories, then we need to recreate dir structure
+    await fs.mkdirp(path.join(`${dest}.unpacked`, path.dirname(filename)));
+    // create symlink within unpacked dir
+    await fs.symlink(link, path.join(`${dest}.unpacked`, filename)).catch(async (error) => {
+      if (error.code === 'EPERM' && error.syscall === 'symlink') {
+        throw new Error(
+          'Could not create symlinks for unpacked assets. On Windows, consider activating Developer Mode to allow non-admin users to create symlinks by following the instructions at https://docs.microsoft.com/en-us/windows/apps/get-started/enable-your-device-for-development.',
+        );
+      }
+      throw error;
+    });
   }
   return out.end();
 };

test/cli-spec.js

@@ -11,6 +11,7 @@ const rimraf = require('rimraf');
 const compDirs = require('./util/compareDirectories');
 const compFileLists = require('./util/compareFileLists');
 const compFiles = require('./util/compareFiles');
+const createSymlinkApp = require('./util/createSymlinkApp');
 
 const exec = promisify(childProcess.exec);
 
@@ -189,41 +190,21 @@ describe('command line interface', function () {
     );
   });
   it('should unpack static framework with all underlying symlinks unpacked', async () => {
+    const { tmpPath } = createSymlinkApp('app');
     await execAsar(
-      'p test/input/packthis-with-symlink/ tmp/packthis-with-symlink.asar --unpack *.txt --unpack-dir "{dir2/subdir,Hello.framework}" --exclude-hidden',
-    );
-    // actual files
-    assert.ok(fs.existsSync('tmp/packthis-with-symlink.asar.unpacked/A/real.txt'));
-    assert.ok(
-      fs.existsSync('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Versions/A/Hello'),
+      `p ${tmpPath} tmp/packthis-with-symlink.asar --unpack *.txt --unpack-dir var --exclude-hidden`,
     );
 
-    // unpacked symlinks
-    assert.equal(
-      fs.readlinkSync('tmp/packthis-with-symlink.asar.unpacked/real.txt'),
-      'Current/real.txt',
+    assert.ok(fs.existsSync('tmp/packthis-with-symlink.asar.unpacked/private/var/file.txt'));
+    assert.ok(fs.existsSync('tmp/packthis-with-symlink.asar.unpacked/private/var/app/file.txt'));
+    assert.strictEqual(
+      fs.readlinkSync('tmp/packthis-with-symlink.asar.unpacked/private/var/app/file.txt'),
+      path.join('..', 'file.txt'),
     );
-
-    assert.equal(
-      fs.readlinkSync('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Hello'),
-      'Versions/Current/Hello',
-    );
-    assert.ok(
-      fs
-        .realpathSync(
-          'tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Versions/Current/Hello',
-        )
-        .endsWith('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Versions/A/Hello'),
-    );
-
-    assert.equal(
-      fs.readlinkSync('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Headers'),
-      'Versions/Current/Headers',
-    );
-    assert.ok(
-      fs
-        .realpathSync('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Headers')
-        .endsWith('tmp/packthis-with-symlink.asar.unpacked/Hello.framework/Versions/A/Headers'),
+    assert.strictEqual(
+      fs.readlinkSync('tmp/packthis-with-symlink.asar.unpacked/var'),
+      path.join('private', 'var'),
     );
+    assert.ok(fs.existsSync('tmp/packthis-with-symlink.asar.unpacked/var/file.txt'));
   });
 });

test/filesystem-spec.js

@@ -4,6 +4,7 @@ const assert = require('assert');
 const fs = require('../lib/wrapped-fs').default;
 const path = require('path');
 const rimraf = require('rimraf');
+const createSymlinkedApp = require('./util/createSymlinkApp');
 
 const Filesystem = require('../lib/filesystem').Filesystem;
 
@@ -13,28 +14,7 @@ describe('filesystem', function () {
   });
 
   it('should does not throw an error when the src path includes a symbol link', async () => {
-    /**
-     * Directory structure:
-     * tmp
-     * ├── private
-     * │   └── var
-     * │       ├── app
-     * │       │   └── file.txt -> ../file.txt
-     * │       └── file.txt
-     * └── var -> private/var
-     */
-    const tmpPath = path.join(__dirname, '..', 'tmp');
-    const privateVarPath = path.join(tmpPath, 'private', 'var');
-    const varPath = path.join(tmpPath, 'var');
-    fs.mkdirSync(privateVarPath, { recursive: true });
-    fs.symlinkSync(path.relative(tmpPath, privateVarPath), varPath);
-
-    const originFilePath = path.join(varPath, 'file.txt');
-    fs.writeFileSync(originFilePath, 'hello world');
-    const appPath = path.join(varPath, 'app');
-    fs.mkdirpSync(appPath);
-    fs.symlinkSync('../file.txt', path.join(appPath, 'file.txt'));
-
+    const { appPath, varPath } = createSymlinkedApp('filesystem');
     const filesystem = new Filesystem(varPath);
     assert.doesNotThrow(() => {
       filesystem.insertLink(path.join(appPath, 'file.txt'));