async function unpack(packager: PlatformPackager<any>, out: string, platform: string, options: any) {
  const dist = packager.config.electronDist
  if (dist == null) {
    const zipPath = (await BluebirdPromise.all<any>([
      downloadElectron(options),
      emptyDir(out)
    ]))[0]

    await spawn(path7za, debug7zArgs("x").concat(zipPath, `-o${out}`))
  }
  else {
    const source = packager.getElectronSrcDir(dist)
    const destination = packager.getElectronDestDir(out)
    log(`Copying Electron from "${source}" to "${destination}"`)
    await emptyDir(out)
    await copyDir(source, destination)
  }

  if (platform === "linux") {
    // https://github.com/electron-userland/electron-builder/issues/786
    // fix dir permissions — opposite to extract-zip, 7za creates dir with no-access for other users, but dir must be readable for non-root users
    await BluebirdPromise.all([
      chmod(path.join(out, "locales"), "0755"),
      chmod(path.join(out, "resources"), "0755")
    ])
  }
}

test("postpone symlink", async () => {
  const tmpDir = new TmpDir()
  const source = await tmpDir.getTempFile("src")
  const aSourceFile = path.join(source, "z", "Z")
  const bSourceFileLink = path.join(source, "B")
  await outputFile(aSourceFile, "test")
  await symlink(aSourceFile, bSourceFileLink)

  const dest = await tmpDir.getTempFile("dest")
  await copyDir(source, dest)

  await tmpDir.cleanup()
})

async function unpack(packager: PlatformPackager<any>, out: string, platform: string, options: InternalElectronDownloadOptions) {
  let dist: string | null | undefined = packager.config.electronDist
  if (dist != null) {
    const zipFile = `electron-v${options.version}-${platform}-${options.arch}.zip`
    const resolvedDist = path.resolve(packager.projectDir, dist)
    if ((await statOrNull(path.join(resolvedDist, zipFile))) != null) {
      options.cache = resolvedDist
      dist = null
    }
  }

  if (dist == null) {
    const zipPath = (await BluebirdPromise.all<any>([
      downloadElectron(options),
      emptyDir(out)
    ]))[0]

    await spawn(path7za, debug7zArgs("x").concat(zipPath, `-o${out}`))
  }
  else {
    const source = packager.getElectronSrcDir(dist)
    const destination = packager.getElectronDestinationDir(out)
    log(`Copying Electron from "${source}" to "${destination}"`)
    await emptyDir(out)
    await copyDir(source, destination, null, null, DO_NOT_USE_HARD_LINKS)
  }

  if (platform === "linux") {
    // https://github.com/electron-userland/electron-builder/issues/786
    // fix dir permissions — opposite to extract-zip, 7za creates dir with no-access for other users, but dir must be readable for non-root users
    await BluebirdPromise.all([
      chmod(path.join(out, "locales"), "0755"),
      chmod(path.join(out, "resources"), "0755")
    ])
  }
}

export async function unpackElectron(packager: PlatformPackager<any>, out: string, platform: string, arch: string, electronVersion: string) {
  const electronDist = packager.config.electronDist
  if (electronDist == null) {
    const zipPath = (await BluebirdPromise.all<any>([
      downloadElectron(createDownloadOpts(packager.config, platform, arch, electronVersion)),
      emptyDir(out)
    ]))[0]

    await spawn(path7za, debug7zArgs("x").concat(zipPath, `-o${out}`))
  }
  else {
    await emptyDir(out)
    await copyDir(path.resolve(packager.info.projectDir, electronDist, "Electron.app"), path.join(out, "Electron.app"))
  }

  if (platform === "linux") {
    // https://github.com/electron-userland/electron-builder/issues/786
    // fix dir permissions — opposite to extract-zip, 7za creates dir with no-access for other users, but dir must be readable for non-root users
    await BluebirdPromise.all([
      chmod(path.join(out, "locales"), "0755"),
      chmod(path.join(out, "resources"), "0755")
    ])
  }
}

export async function assertPack(fixtureName: string, packagerOptions: PackagerOptions, checkOptions: AssertPackOptions = {}): Promise<void> {
  if (checkOptions.signed) {
    packagerOptions = signed(packagerOptions)
  }
  if (checkOptions.signedWin) {
    packagerOptions.cscLink = WIN_CSC_LINK
    packagerOptions.cscKeyPassword = ""
  }
  else if (packagerOptions.cscLink == null) {
    packagerOptions = deepAssign({}, packagerOptions, {config: {mac: {identity: null}}})
  }

  const projectDirCreated = checkOptions.projectDirCreated
  let projectDir = path.join(__dirname, "..", "..", "fixtures", fixtureName)
  // const isDoNotUseTempDir = platform === "darwin"
  const customTmpDir = process.env.TEST_APP_TMP_DIR
  let dirToDelete: string | null = null
  // non-macOS test uses the same dir as macOS test, but we cannot share node_modules (because tests executed in parallel)
  const dir = customTmpDir == null ? getTempFile() : path.resolve(customTmpDir)
  if (customTmpDir == null) {
    dirToDelete = dir
  }
  else {
    log(`Custom temp dir used: ${customTmpDir}`)
  }
  await emptyDir(dir)
  await copyDir(projectDir, dir, it => {
    const basename = path.basename(it)
    return basename !== OUT_DIR_NAME && basename !== "node_modules" && !basename.startsWith(".")
  }, null, it => path.basename(it) !== "package.json")
  projectDir = dir

  await executeFinally((async () => {
    if (projectDirCreated != null) {
      await projectDirCreated(projectDir)
      if (checkOptions.installDepsBefore) {
        // bin links required (e.g. for node-pre-gyp - if package refers to it in the install script)
        await spawn(process.platform === "win32" ? "yarn.cmd" : "yarn", ["install", "--production", "--no-lockfile"], {
          cwd: projectDir,
        })
      }
    }

    const {packager, outDir} = await packAndCheck({projectDir, ...packagerOptions}, checkOptions)

    if (checkOptions.packed != null) {
      function base(platform: Platform, arch?: Arch): string {
        return path.join(outDir, `${platform.buildConfigurationKey}${getArchSuffix(arch == null ? Arch.x64 : arch)}${platform === Platform.MAC ? "" : "-unpacked"}`)
      }

      await checkOptions.packed({
        projectDir,
        outDir,
        getResources: (platform, arch) => path.join(base(platform, arch), "resources"),
        getContent: platform => base(platform),
        packager,
      })
    }
  })(), async () => {
    if (dirToDelete != null) {
      try {
        await remove(dirToDelete)
      }
      catch (e) {
        console.warn(`Cannot delete temporary directory ${dirToDelete}: ${(e.stack || e)}`)
      }
    }
  })
}