feat: ignore system junk files by default

docs/api.md

@@ -307,10 +307,19 @@ described after the list*):
 
 Alternatively, this can be a predicate function that, given an absolute file path, returns `true` if
 the file should be ignored, or `false` if the file should be kept. *This does not use any of the
-default ignored directories listed above.*
+default ignored files/directories listed above.*
 
 **Note:** `ignore` will have no effect if [`prebuiltAsar`](#prebuiltasar) is set.
 
+##### `junk`
+
+*Boolean* (default: `true`)
+
+Ignores [system junk files](https://github.com/sindresorhus/junk) when copying the Electron app,
+regardless of the [`ignore`](#ignore) option.
+
+**Note:** `junk` will have no effect if [`prebuiltAsar`](#prebuiltasar) is set.
+
 ##### `name`
 
 *String*
@@ -359,6 +368,7 @@ gets skipped over:
 * [`afterPrune`](#afterprune)
 * [`derefSymlinks`](#derefsymlinks)
 * [`ignore`](#ignore)
+* [`junk`](#junk)
 * [`prune`](#prune)
 
 ##### `prune`

package.json

@@ -26,6 +26,7 @@
     "fs-extra": "^7.0.0",
     "galactus": "^0.2.1",
     "get-package-info": "^1.0.0",
+    "junk": "^3.1.0",
     "parse-author": "^2.0.0",
     "plist": "^3.0.0",
     "rcedit": "^2.0.0",

src/cli.js

@@ -21,13 +21,15 @@ module.exports = {
         'all',
         'deref-symlinks',
         'download.strictSSL',
+        'junk',
         'overwrite',
         'prune',
         'quiet'
       ],
       default: {
         'deref-symlinks': true,
         'download.strictSSL': true,
+        junk: true,
         prune: true
       },
       string: [

src/ignore.js

@@ -2,6 +2,7 @@
 
 const common = require('./common')
 const debug = require('debug')('electron-packager')
+const junk = require('junk')
 const path = require('path')
 const prune = require('./prune')
 const targets = require('./targets')
@@ -74,6 +75,12 @@ function userIgnoreFilter (opts) {
       return false
     }
 
+    if (opts.junk !== false) { // defaults to true
+      if (junk.is(path.basename(fullPath))) {
+        return false
+      }
+    }
+
     let name = fullPath.split(path.resolve(opts.dir))[1]
 
     if (path.sep === '\\') {

test/ignore.js

@@ -20,18 +20,30 @@ async function assertOutDirIgnored (t, opts, existingDirectoryPath, pathToIgnore
   await util.assertPathNotExists(t, path.join(resourcesPath, 'app', ignoredBasenameToCheck), 'Out dir must not exist in output app directory')
 }
 
+async function copyDirToTempDirWithIgnores (t, opts) {
+  ignore.generateIgnores(opts)
+  const targetDir = path.join(t.context.tempDir, 'result')
+  await fs.copy(opts.dir, targetDir, { dereference: false, filter: ignore.userIgnoreFilter(opts) })
+  return targetDir
+}
+
+async function assertFileIgnored (t, targetDir, ignoredFile) {
+  await util.assertPathNotExists(t, path.join(targetDir, ignoredFile), `Ignored file '${ignoredFile}' should not exist in copied directory`)
+}
+
+async function assertFileNotIgnored (t, targetDir, notIgnoredFile) {
+  await util.assertPathExists(t, path.join(targetDir, notIgnoredFile), `The expected output directory should exist and contain ${notIgnoredFile}`)
+}
+
 async function ignoreTest (t, opts, ignorePattern, ignoredFile) {
   opts.dir = util.fixtureSubdir('basic')
   if (ignorePattern) {
     opts.ignore = ignorePattern
   }
 
-  const targetDir = path.join(t.context.tempDir, 'result')
-  ignore.generateIgnores(opts)
-
-  await fs.copy(opts.dir, targetDir, { dereference: false, filter: ignore.userIgnoreFilter(opts) })
-  await util.assertPathExists(t, path.join(targetDir, 'package.json'), 'The expected output directory should exist and contain files')
-  await util.assertPathNotExists(t, path.join(targetDir, ignoredFile), `Ignored file '${ignoredFile}' should not exist in copied directory`)
+  const targetDir = await copyDirToTempDirWithIgnores(t, opts)
+  await assertFileIgnored(t, targetDir, ignoredFile)
+  await assertFileNotIgnored(t, targetDir, 'package.json')
 }
 
 async function ignoreOutDirTest (t, opts, distPath) {
@@ -72,6 +84,19 @@ test('ignore: RegExp', util.testSinglePlatform(ignoreTest, /ignorethis/, 'ignore
 test('ignore: Function', util.testSinglePlatform(ignoreTest, file => file.match(/ignorethis/), 'ignorethis.txt'))
 test('ignore: string with slash', util.testSinglePlatform(ignoreTest, 'ignore/this', path.join('ignore', 'this.txt')))
 test('ignore: only match subfolder of app', util.testSinglePlatform(ignoreTest, 'electron-packager', path.join('electron-packager', 'readme.txt')))
+
+test('ignore: junk by default', util.testSinglePlatform(async (t, opts) => {
+  opts.dir = util.fixtureSubdir('ignore-junk')
+  const targetDir = await copyDirToTempDirWithIgnores(t, opts)
+  await assertFileIgnored(t, targetDir, 'subfolder/Thumbs.db')
+}))
+test('ignore: not junk when junk: false', util.testSinglePlatform(async (t, opts) => {
+  opts.dir = util.fixtureSubdir('ignore-junk')
+  opts.junk = false
+  const targetDir = await copyDirToTempDirWithIgnores(t, opts)
+  await assertFileNotIgnored(t, targetDir, 'subfolder/Thumbs.db')
+}))
+
 test.serial('ignore out dir', util.testSinglePlatform(ignoreOutDirTest, 'ignoredOutDir'))
 test.serial('ignore out dir: unnormalized path', util.testSinglePlatform(ignoreOutDirTest, './ignoredOutDir'))
 test.serial('ignore out dir: implicit path', util.testSinglePlatform(async (t, opts) => {

usage.txt

@@ -53,6 +53,7 @@ ignore             do not copy files into app whose filenames RegExp.match this
                    https://github.com/electron-userland/electron-packager/blob/master/docs/api.md#ignore
                    and --no-prune. Can be specified multiple times
 no-deref-symlinks  make sure symlinks are not dereferenced within the app source
+no-junk            do not ignore system junk files from the packaged app
 no-prune           do not prune devDependencies from the packaged app
 out                the dir to put the app into at the end. Defaults to current working dir
 overwrite          if output directory for a platform already exists, replaces it rather than