src/Pure/Admin/build_cygwin.scala

clarified signature;

/*  Title:      Pure/Admin/build_cygwin.scala
    Author:     Makarius

Produce pre-canned Cygwin distribution for Isabelle.
*/

package isabelle


object Build_Cygwin
{
  val default_mirror: String = "https://isabelle.sketis.net/cygwin_2020"

  val packages: List[String] =
    List("curl", "libgmp-devel", "nano", "perl", "perl-libwww-perl", "rlwrap", "unzip")

  def build_cygwin(progress: Progress,
    mirror: String = default_mirror,
    more_packages: List[String] = Nil)
  {
    require(Platform.is_windows)

    Isabelle_System.with_tmp_dir("cygwin")(tmp_dir =>
      {
        val cygwin = tmp_dir + Path.explode("cygwin")
        val cygwin_etc = cygwin + Path.explode("etc")
        val cygwin_isabelle = cygwin + Path.explode("isabelle")
        Isabelle_System.mkdirs(cygwin_isabelle)

        val cygwin_exe_name = mirror + "/setup-x86_64.exe"
        val cygwin_exe = cygwin_isabelle + Path.explode("cygwin.exe")
        Bytes.write(cygwin_exe,
          try { Bytes.read(Url(cygwin_exe_name)) }
          catch { case ERROR(_) => error("Failed to download " + quote(cygwin_exe_name)) })

        File.write(cygwin_isabelle + Path.explode("cygwin_mirror"), mirror)

        File.set_executable(cygwin_exe, true)
        Isabelle_System.bash(File.bash_path(cygwin_exe) + " -h </dev/null >/dev/null").check

        val res =
          progress.bash(
            File.bash_path(cygwin_exe) + " --site " + Bash.string(mirror) + " --no-verify" +
              " --local-package-dir 'C:\\temp'" +
              " --root " + File.bash_platform_path(cygwin) +
              " --packages " + quote((packages ::: more_packages).mkString(",")) +
              " --no-shortcuts --no-startmenu --no-desktop --quiet-mode",
            echo = true)
        if (!res.ok || !cygwin_etc.is_dir) error("Failed")

        for (name <- List("hosts", "protocols", "services", "networks", "passwd", "group"))
          (cygwin_etc + Path.explode(name)).file.delete

        (cygwin + Path.explode("Cygwin.bat")).file.delete

        val archive = "cygwin-" + Date.Format("uuuuMMdd")(Date.now()) + ".tar.gz"
        Isabelle_System.gnutar("-czf " + Bash.string(archive) + " cygwin", dir = tmp_dir).check
      })
  }


  /* Isabelle tool wrapper */

  val isabelle_tool =
    Isabelle_Tool("build_cygwin", "produce pre-canned Cygwin distribution for Isabelle", args =>
    {
      var mirror = default_mirror
      var more_packages: List[String] = Nil

      val getopts =
        Getopts("""
Usage: isabelle build_cygwin [OPTIONS]

  Options are:
    -R MIRROR    Cygwin mirror site (default """ + quote(default_mirror) + """)
    -p NAME      additional Cygwin package

  Produce pre-canned Cygwin distribution for Isabelle: this requires
  Windows administrator mode.
""",
          "R:" -> (arg => mirror = arg),
          "p:" -> (arg => more_packages ::= arg))

      val more_args = getopts(args)
      if (more_args.nonEmpty) getopts.usage()

      build_cygwin(new Console_Progress(), mirror = mirror, more_packages = more_packages)
    })
}