src/Pure/Admin/build_jdk.scala

clarified signature;
omit somewhat pointless test for "unzip" command;

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

Build Isabelle jdk component from original platform installations.
*/

package isabelle


import java.io.{File => JFile}
import java.nio.file.Files
import java.nio.file.attribute.PosixFilePermission

import scala.util.matching.Regex


object Build_JDK {
  /* platform and version information */

  sealed case class JDK_Platform(
    platform_name: String,
    platform_regex: Regex,
    exe: String = "java",
    macos_home: Boolean = false,
    jdk_version: String = ""
  ) {
    override def toString: String = platform_name

    def platform_path: Path = Path.explode(platform_name)

    def detect(jdk_dir: Path): Option[JDK_Platform] = {
      val major_version = {
        val Major_Version = """.*jdk(\d+).*$""".r
        val jdk_name = jdk_dir.file.getName
        jdk_name match {
          case Major_Version(s) => s
          case _ => error("Cannot determine major version from " + quote(jdk_name))
        }
      }

      val path = jdk_dir + Path.explode("bin") + Path.explode(exe)
      if (path.is_file) {
        val file_descr = Isabelle_System.bash("file -b " + File.bash_path(path)).check.out
        if (platform_regex.matches(file_descr)) {
          val Version = ("^(" + major_version + """[0-9.+]+)(?:-LTS)?$""").r
          val version_lines =
            Isabelle_System.bash("strings " + File.bash_path(path)).check
              .out_lines.flatMap({ case Version(s) => Some(s) case _ => None })
          version_lines match {
            case List(jdk_version) => Some(copy(jdk_version = jdk_version))
            case _ => error("Expected unique version within executable " + path)
          }
        }
        else None
      }
      else None
    }
  }

  val templates: List[JDK_Platform] =
    List(
      JDK_Platform("arm64-darwin", """.*Mach-O 64-bit.*arm64.*""".r, macos_home = true),
      JDK_Platform("arm64-linux", """.*ELF 64-bit.*ARM aarch64.*""".r),
      JDK_Platform("x86_64-darwin", """.*Mach-O 64-bit.*x86[-_]64.*""".r, macos_home = true),
      JDK_Platform("x86_64-linux", """.*ELF 64-bit.*x86[-_]64.*""".r),
      JDK_Platform("x86_64-windows", """.*PE32\+ executable.*x86[-_]64.*""".r, exe = "java.exe"))


  /* README */

  def readme(jdk_version: String): String =
    """This is OpenJDK """ + jdk_version + """ based on downloads by Azul, see also
https://www.azul.com/downloads/zulu-community/?package=jdk

The main license is GPL2, but some modules are covered by other (more liberal)
licenses, see legal/* for details.

Linux, Windows, macOS all work uniformly, depending on platform-specific
subdirectories.
"""


  /* settings */

  val settings: String =
    """# -*- shell-script -*- :mode=shellscript:

case "$ISABELLE_PLATFORM_FAMILY" in
  linux)
    ISABELLE_JAVA_PLATFORM="$ISABELLE_PLATFORM64"
    ISABELLE_JDK_HOME="$COMPONENT/$ISABELLE_JAVA_PLATFORM"
    ;;
  windows)
    ISABELLE_JAVA_PLATFORM="$ISABELLE_WINDOWS_PLATFORM64"
    ISABELLE_JDK_HOME="$COMPONENT/$ISABELLE_JAVA_PLATFORM"
    ;;
  macos)
    if [ -n "$ISABELLE_APPLE_PLATFORM64" -a -d "$COMPONENT/$ISABELLE_APPLE_PLATFORM64" ]
    then
      ISABELLE_JAVA_PLATFORM="$ISABELLE_APPLE_PLATFORM64"
    else
      ISABELLE_JAVA_PLATFORM="$ISABELLE_PLATFORM64"
    fi
    ISABELLE_JDK_HOME="$COMPONENT/$ISABELLE_JAVA_PLATFORM"
    ;;
esac
"""


  /* extract archive */

  def extract_archive(dir: Path, archive: Path): JDK_Platform = {
    try {
      val tmp_dir = Isabelle_System.make_directory(dir + Path.explode("tmp"))

      Isabelle_System.extract(archive, tmp_dir)

      val jdk_dir = File.get_dir(tmp_dir, title = archive.file_name)

      val platform =
        templates.view.flatMap(_.detect(jdk_dir))
          .headOption.getOrElse(error("Failed to detect JDK platform"))

      val platform_dir = dir + platform.platform_path
      if (platform_dir.is_dir) error("Directory already exists: " + platform_dir)

      Isabelle_System.move_file(jdk_dir, platform_dir)

      platform
    }
    catch { case ERROR(msg) => cat_error(msg, "The error(s) above occurred for " + archive) }
  }


  /* build jdk */

  def build_jdk(
    archives: List[Path],
    progress: Progress = new Progress,
    target_dir: Path = Path.current
  ): Unit = {
    if (Platform.is_windows) error("Cannot build jdk on Windows")

    Isabelle_System.with_tmp_dir("jdk") { dir =>
      progress.echo("Extracting ...")
      val platforms = archives.map(extract_archive(dir, _))

      val jdk_version =
        platforms.map(_.jdk_version).distinct match {
          case List(version) => version
          case Nil => error("No archives")
          case versions =>
            error("Archives contain multiple JDK versions: " + commas_quote(versions))
        }

      templates.filterNot(p1 => platforms.exists(p2 => p1.platform_name == p2.platform_name))
      match {
        case Nil =>
        case missing => error("Missing platforms: " + commas_quote(missing.map(_.platform_name)))
      }

      val jdk_name = "jdk-" + jdk_version
      val jdk_path = Path.explode(jdk_name)
      val component_dir = Components.Directory.create(dir + jdk_path, progress = progress)

      File.write(component_dir.settings, settings)
      File.write(component_dir.README, readme(jdk_version))

      for (platform <- platforms) {
        Isabelle_System.move_file(dir + platform.platform_path, component_dir.path)
      }

      for (file <- File.find_files(component_dir.path.file, include_dirs = true)) {
        val path = file.toPath
        val perms = Files.getPosixFilePermissions(path)
        perms.add(PosixFilePermission.OWNER_READ)
        perms.add(PosixFilePermission.GROUP_READ)
        perms.add(PosixFilePermission.OTHERS_READ)
        perms.add(PosixFilePermission.OWNER_WRITE)
        if (file.isDirectory) {
          perms.add(PosixFilePermission.OWNER_WRITE)
          perms.add(PosixFilePermission.OWNER_EXECUTE)
          perms.add(PosixFilePermission.GROUP_EXECUTE)
          perms.add(PosixFilePermission.OTHERS_EXECUTE)
        }
        Files.setPosixFilePermissions(path, perms)
      }

      progress.echo("Archiving ...")
      Isabelle_System.gnutar(
        "-czf " + File.bash_path(target_dir + jdk_path.tar.gz) + " " + jdk_name, dir = dir).check
    }
  }


  /* Isabelle tool wrapper */

  val isabelle_tool =
    Isabelle_Tool("build_jdk", "build Isabelle jdk component from original archives",
      Scala_Project.here,
      { args =>
        var target_dir = Path.current

        val getopts = Getopts("""
Usage: isabelle build_jdk [OPTIONS] ARCHIVES...

  Options are:
    -D DIR       target directory (default ".")

  Build jdk component from tar.gz archives, with original jdk archives
  for Linux, Windows, and macOS.
""",
          "D:" -> (arg => target_dir = Path.explode(arg)))

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

        val archives = more_args.map(Path.explode)
        val progress = new Console_Progress()

        build_jdk(archives = archives, progress = progress, target_dir = target_dir)
      })
}