src/Pure/Tools/phabricator.scala

clarified signature: prefer symbolic isabelle.Path over physical java.io.File;

/*  Title:      Pure/Tools/phabricator.scala
    Author:     Makarius

Support for Phabricator server, notably for Ubuntu 20.04 or 22.04 LTS.

See also:
  - https://www.phacility.com/phabricator
  - https://secure.phabricator.com/book/phabricator
*/

package isabelle


import scala.collection.mutable
import scala.util.matching.Regex


object Phabricator {
  /** defaults **/

  /* system packages */

  val packages_ubuntu_20_04: List[String] =
    Docker_Build.packages :::
    List(
      // https://secure.phabricator.com/source/phabricator/browse/master/scripts/install/install_ubuntu.sh 15e6e2adea61
      "git", "mysql-server", "php", "php-mysql", "php-gd", "php-curl", "php-apcu", "php-cli",
      "php-json", "php-mbstring",
      // more packages
      "php-xml", "php-zip", "python3-pygments", "ssh", "subversion", "python-pygments",
      // mercurial build packages
      "make", "gcc", "python", "python2-dev", "python-docutils", "python-openssl")

  val packages_ubuntu_22_04: List[String] =
    Docker_Build.packages :::
    List(
      // https://secure.phabricator.com/source/phabricator/browse/master/scripts/install/install_ubuntu.sh 15e6e2adea61
      "git", "mysql-server", "php", "php-mysql", "php-gd", "php-curl", "php-apcu", "php-cli",
      "php-json", "php-mbstring",
      // more packages
      "php-xml", "php-zip", "python3-pygments", "ssh", "subversion",
      // mercurial build packages
      "make", "gcc", "python3", "python3-dev", "python3-docutils")

  def packages(webserver: Webserver): List[String] = {
    val release = Linux.Release()
    val pkgs =
      if (release.is_ubuntu_20_04) packages_ubuntu_20_04
      else if (release.is_ubuntu_22_04) packages_ubuntu_22_04
      else error("Bad Linux version: expected Ubuntu 20.04 or 22.04 LTS")
    pkgs ::: webserver.packages()
  }


  /* webservers */

  sealed abstract class Webserver {
    override def toString: String = user_name
    def user_name: String
    def system_name: String
    def php_name: String = system_name

    def packages(): List[String]

    def system_path: Path = Path.basic(system_name)
    def root_dir: Path = Path.explode("/etc") + system_path
    def sites_dir: Path = root_dir + Path.explode("sites-available")

    def restart(): Unit = Linux.service_restart(system_name)

    def php_init(): Unit =
      File.write(Linux.php_conf_dir(php_name) + Path.basic(isabelle_phabricator_name(ext = "ini")),
        "post_max_size = 32M\n" +
        "opcache.validate_timestamps = 0\n" +
        "memory_limit = 512M\n" +
        "max_execution_time = 120\n")

    def site_name(name: String): String = isabelle_phabricator_name(name = name)

    def site_conf(name: String): Path =
      sites_dir + Path.basic(isabelle_phabricator_name(name = name, ext = "conf"))

    def site_init(name: String, server_name: String, webroot: String): Unit
  }

  object Apache extends Webserver {
    override val user_name = "Apache"
    override def system_name = "apache2"
    override def packages(): List[String] = List("apache2", "libapache2-mod-php")

    override def site_init(name: String, server_name: String, webroot: String): Unit = {
      File.write(site_conf(name),
"""<VirtualHost *:80>
    ServerName """ + server_name + """
    ServerAdmin webmaster@localhost
    DocumentRoot """ + webroot + """

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    RewriteEngine on
    RewriteRule ^(.*)$  /index.php?__path__=$1  [B,L,QSA]
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
""")
      Isabelle_System.bash("""
        set -e
        a2enmod rewrite
        a2ensite """ + Bash.string(site_name(name))).check
    }
  }

  object Nginx extends Webserver {
    override val user_name = "Nginx"
    override val system_name = "nginx"
    override val php_name = "fpm"
    override def packages(): List[String] = List("nginx", "php-fpm")

    override def site_init(name: String, server_name: String, webroot: String): Unit = {
      File.write(site_conf(name),
"""server {
  listen 80;
  listen [::]:80;

  server_name """ + server_name + """;
  root """ + webroot + """;

  location / {
    index index.php;
    rewrite ^/(.*)$ /index.php?__path__=/$1 last;
  }

  location ~ \.php$ {
    include snippets/fastcgi-php.conf;
    fastcgi_pass unix:/var/run/php/php""" + Linux.php_version() + """-fpm.sock;
  }

  location /index.php {
    fastcgi_index  index.php;

    #required if PHP was built with --enable-force-cgi-redirect
    fastcgi_param  REDIRECT_STATUS    200;

    #variables to make the $_SERVER populate in PHP
    fastcgi_param  SCRIPT_FILENAME    $document_root$fastcgi_script_name;
    fastcgi_param  QUERY_STRING       $query_string;
    fastcgi_param  REQUEST_METHOD     $request_method;
    fastcgi_param  CONTENT_TYPE       $content_type;
    fastcgi_param  CONTENT_LENGTH     $content_length;

    fastcgi_param  SCRIPT_NAME        $fastcgi_script_name;

    fastcgi_param  GATEWAY_INTERFACE  CGI/1.1;
    fastcgi_param  SERVER_SOFTWARE    nginx/$nginx_version;

    fastcgi_param  REMOTE_ADDR        $remote_addr;
  }
}
""")
      Isabelle_System.bash(
        "ln -sf " + File.bash_path(site_conf(name)) + " /etc/nginx/sites-enabled/.").check
    }
  }

  val all_webservers: List[Webserver] = List(Apache, Nginx)

  def get_webserver(name: String): Webserver =
    all_webservers.find(w => w.user_name == name) getOrElse
      error("Bad webserver " + quote(name))

  val default_webserver: Webserver = Apache


  /* global system resources */

  val www_user = "www-data"

  val daemon_user = "phabricator"

  val sshd_config: Path = Path.explode("/etc/ssh/sshd_config")


  /* installation parameters */

  val default_name = "vcs"

  def phabricator_name(name: String = "", ext: String = ""): String =
    "phabricator" + if_proper(name, "-" + name) + if_proper(ext, "." + ext)

  def isabelle_phabricator_name(name: String = "", ext: String = ""): String =
    "isabelle-" + phabricator_name(name = name, ext = ext)

  def default_root(name: String): Path =
    Path.explode("/var/www") + Path.basic(phabricator_name(name = name))

  def default_repo(name: String): Path = default_root(name) + Path.basic("repo")

  val default_mailers: Path = Path.explode("mailers.json")

  val default_system_port: Int = 22
  val alternative_system_port = 222
  val default_server_port = 2222

  def standard_mercurial_source: String = {
    val release = Linux.Release()
    if (release.is_ubuntu_20_04) "https://www.mercurial-scm.org/release/mercurial-3.9.2.tar.gz"
    else "https://www.mercurial-scm.org/release/mercurial-6.1.4.tar.gz"
  }



  /** global configuration **/

  val global_config: Path = Path.explode("/etc/" + isabelle_phabricator_name(ext = "conf"))

  def global_config_script(
    init: String = "",
    body: String = "",
    exit: String = ""): String = {
"""#!/bin/bash
""" + if_proper(init, "\n" + init) + """
{
  while { unset REPLY; read -r; test "$?" = 0 -o -n "$REPLY"; }
  do
    NAME="$(echo "$REPLY" | cut -d: -f1)"
    ROOT="$(echo "$REPLY" | cut -d: -f2)"
    {
""" + Library.indent_lines(6, body) + """
    } < /dev/null
  done
} < """ + File.bash_path(global_config) + "\n" +
    if_proper(exit, "\n" + exit + "\n")
  }

  sealed case class Config(name: String, root: Path) {
    def home: Path = root + Path.explode(phabricator_name())

    def execute(command: String): Process_Result =
      Isabelle_System.bash("bin/" + command, cwd = home, redirect = true).check

    def webroot: String = home.implode + "/webroot"
  }

  def read_config(): List[Config] = {
    if (global_config.is_file) {
      for (entry <- Library.trim_split_lines(File.read(global_config)) if entry.nonEmpty)
      yield {
        space_explode(':', entry) match {
          case List(name, root) => Config(name, Path.explode(root))
          case _ => error("Malformed config file " + global_config + "\nentry " + quote(entry))
        }
      }
    }
    else Nil
  }

  def write_config(configs: List[Config]): Unit = {
    File.write(global_config,
      configs.map(config => config.name + ":" + config.root.implode).mkString("", "\n", "\n"))
  }

  def get_config(name: String): Config =
    read_config().find(config => config.name == name) getOrElse
      error("Bad Isabelle/Phabricator installation " + quote(name))



  /** administrative tools **/

  /* Isabelle tool wrapper */

  val isabelle_tool1 =
    Isabelle_Tool("phabricator", "invoke command-line tool within Phabricator home directory",
      Scala_Project.here,
      { args =>
        var list = false
        var name = default_name

        val getopts = Getopts("""
Usage: isabelle phabricator [OPTIONS] COMMAND [ARGS...]

  Options are:
    -l           list available Phabricator installations
    -n NAME      Phabricator installation name (default: """ + quote(default_name) + """)

  Invoke a command-line tool within the home directory of the named
  Phabricator installation.
""",
          "l" -> (_ => list = true),
          "n:" -> (arg => name = arg))

        val more_args = getopts(args)
        if (more_args.isEmpty && !list) getopts.usage()

        val progress = new Console_Progress

        if (list) {
          for (config <- read_config()) {
            progress.echo("phabricator " + quote(config.name) + " root " + config.root)
          }
        }
        else {
          val config = get_config(name)
          val result = progress.bash(Bash.strings(more_args), cwd = config.home, echo = true)
          if (!result.ok) error(result.print_return_code)
        }
      })



  /** setup **/

  def user_setup(name: String, description: String, ssh_setup: Boolean = false): Unit = {
    if (!Linux.user_exists(name)) {
      Linux.user_add(name, description = description, system = true, ssh_setup = ssh_setup)
    }
    else if (Linux.user_description(name) != description) {
      error("User " + quote(name) + " already exists --" +
        " for Phabricator it should have the description:\n  " + quote(description))
    }
  }

  def command_setup(name: String,
    init: String = "",
    body: String = "",
    exit: String = ""
  ): Path = {
    val command = Path.explode("/usr/local/bin") + Path.basic(name)
    File.write(command, global_config_script(init = init, body = body, exit = exit))
    Isabelle_System.chmod("755", command)
    Isabelle_System.chown("root:root", command)
    command
  }

  def mercurial_setup(mercurial_source: String, progress: Progress = new Progress): Unit = {
    progress.echo("\nMercurial installation from source " + quote(mercurial_source) + " ...")
    Isabelle_System.with_tmp_dir("mercurial") { tmp_dir =>
      val archive =
        if (Url.is_wellformed(mercurial_source)) {
          val archive = tmp_dir + Path.basic("mercurial.tar.gz")
          Isabelle_System.download_file(mercurial_source, archive)
          archive
        }
        else Path.explode(mercurial_source)

      Isabelle_System.extract(archive, tmp_dir)
      val build_dir = File.get_dir(tmp_dir, title = mercurial_source)

      progress.bash("make all && make install", cwd = build_dir, echo = true).check
    }
  }

  def phabricator_setup(
    options: Options,
    name: String = default_name,
    root: String = "",
    repo: String = "",
    webserver: Webserver = default_webserver,
    package_update: Boolean = false,
    mercurial_source: String = "",
    progress: Progress = new Progress
  ): Unit = {
    /* system environment */

    Linux.check_system_root()

    progress.echo("System packages ...")

    if (package_update) {
      Linux.package_update(progress = progress)
      Linux.check_reboot_required()
    }

    Linux.package_install(packages(webserver), progress = progress)
    Linux.check_reboot_required()


    if (mercurial_source.nonEmpty) {
      for { name <- List("mercurial", "mercurial-common") if Linux.package_installed(name) } {
        error("Cannot install Mercurial from source:\n" +
          "package package " + quote(name) + " already installed")
      }
      mercurial_setup(mercurial_source, progress = progress)
    }


    /* users */

    if (name.exists((c: Char) => !(Symbol.is_ascii_letter(c) || Symbol.is_ascii_digit(c))) ||
        Set("", "ssh", "phd", "dump", daemon_user).contains(name)) {
      error("Bad installation name: " + quote(name))
    }

    user_setup(daemon_user, "Phabricator Daemon User", ssh_setup = true)
    user_setup(name, "Phabricator SSH User")


    /* basic installation */

    progress.echo("\nPhabricator installation ...")

    val root_path = if (root.nonEmpty) Path.explode(root) else default_root(name)
    val repo_path = if (repo.nonEmpty) Path.explode(repo) else default_repo(name)

    val configs = read_config()

    for (config <- configs if config.name == name) {
      error("Duplicate Phabricator installation " + quote(name) + " in " + config.root)
    }

    if (!Isabelle_System.bash("mkdir -p " + File.bash_path(root_path)).ok) {
      error("Failed to create root directory " + root_path)
    }

    Isabelle_System.chown(Bash.string(www_user) + ":" + Bash.string(www_user), root_path)
    Isabelle_System.chmod("755", root_path)

    progress.bash(cwd = root_path, echo = true,
      script = """
        set -e
        echo "Cloning distribution repositories:"

        git clone --branch stable https://we.phorge.it/source/arcanist.git
        git -C arcanist reset --hard """ +
          Bash.string(options.string("phabricator_version_arcanist")) + """

        git clone --branch stable https://we.phorge.it/source/phorge.git phabricator
        git -C phabricator reset --hard """ +
          Bash.string(options.string("phabricator_version_phabricator")) + """
      """).check

    val config = Config(name, root_path)
    write_config(configs ::: List(config))

    config.execute("config set pygments.enabled true")


    /* local repository directory */

    progress.echo("\nRepository hosting setup ...")

    if (!Isabelle_System.bash("mkdir -p " + File.bash_path(repo_path)).ok) {
      error("Failed to create local repository directory " + repo_path)
    }

    Isabelle_System.chown(
      "-R " + Bash.string(daemon_user) + ":" + Bash.string(daemon_user), repo_path)
    Isabelle_System.chmod("755", repo_path)

    config.execute("config set repository.default-local-path " + File.bash_path(repo_path))


    val sudoers_file =
      Path.explode("/etc/sudoers.d") + Path.basic(isabelle_phabricator_name(name = name))
    File.write(sudoers_file,
      www_user + " ALL=(" + daemon_user + ") SETENV: NOPASSWD: /usr/bin/git, /usr/local/bin/hg, /usr/bin/hg, /usr/bin/ssh, /usr/bin/id\n" +
      name + " ALL=(" + daemon_user + ") SETENV: NOPASSWD: /usr/bin/git, /usr/bin/git-upload-pack, /usr/bin/git-receive-pack, /usr/local/bin/hg, /usr/bin/hg, /usr/bin/svnserve, /usr/bin/ssh, /usr/bin/id\n")

    Isabelle_System.chmod("440", sudoers_file)

    config.execute("config set diffusion.ssh-user " + Bash.string(config.name))


    /* MySQL setup */

    progress.echo("\nMySQL setup ...")

    File.write(Path.explode("/etc/mysql/mysql.conf.d/" + phabricator_name(ext = "cnf")),
"""[mysqld]
max_allowed_packet = 32M
innodb_buffer_pool_size = 1600M
local_infile = 0
""")

    Linux.service_restart("mysql")


    def mysql_conf(R: Regex, which: String): String = {
      val conf = Path.explode("/etc/mysql/debian.cnf")
      split_lines(File.read(conf)).collectFirst({ case R(a) => a }) match {
        case Some(res) => res
        case None => error("Cannot determine " + which + " from " + conf)
      }
    }

    val mysql_root_user = mysql_conf("""^user\s*=\s*(\S*)\s*$""".r, "superuser name")
    val mysql_root_password = mysql_conf("""^password\s*=\s*(\S*)\s*$""".r, "superuser password")

    val mysql_name = phabricator_name(name = name).replace("-", "_")
    val mysql_user_string = SQL.string(mysql_name) + "@'localhost'"
    val mysql_password = Linux.generate_password()

    Isabelle_System.bash("mysql --user=" + Bash.string(mysql_root_user) +
      " --password=" + Bash.string(mysql_root_password) + " --execute=" +
      Bash.string(
        """DROP USER IF EXISTS """ + mysql_user_string + "; " +
        """CREATE USER """ + mysql_user_string +
        """ IDENTIFIED BY """ + SQL.string(mysql_password) + """ PASSWORD EXPIRE NEVER; """ +
        """GRANT ALL ON `""" + (mysql_name + "_%").replace("_", "\\_") +
        """`.* TO """ + mysql_user_string + ";" +
        """GRANT PROCESS ON *.* TO """ + mysql_user_string + ";")).check

    config.execute("config set mysql.user " + Bash.string(mysql_name))
    config.execute("config set mysql.pass " + Bash.string(mysql_password))

    config.execute("config set phabricator.cache-namespace " + Bash.string(mysql_name))
    config.execute("config set storage.default-namespace " + Bash.string(mysql_name))
    config.execute("config set storage.mysql-engine.max-size 8388608")

    progress.bash("bin/storage upgrade --force", cwd = config.home, echo = true).check


    /* database dump */

    val dump_name = isabelle_phabricator_name(name = "dump")
    command_setup(dump_name, body =
"""mkdir -p "$ROOT/database" && chown root:root "$ROOT/database" && chmod 700 "$ROOT/database"
[ -e "$ROOT/database/dump.sql.gz" ] && mv -f "$ROOT/database/dump.sql.gz" "$ROOT/database/dump-old.sql.gz"
echo -n "Creating $ROOT/database/dump.sql.gz ..."
"$ROOT/phabricator/bin/storage" dump --compress --output "$ROOT/database/dump.sql.gz" 2>&1 | fgrep -v '[Warning] Using a password on the command line interface can be insecure'
echo " $(ls -hs "$ROOT/database/dump.sql.gz" | cut -d" " -f1)" """)


    /* Phabricator upgrade */

    command_setup(isabelle_phabricator_name(name = "upgrade"),
      init =
"""BRANCH="${1:-stable}"
if [ "$BRANCH" != "master" -a "$BRANCH" != "stable" ]
then
  echo "Bad branch: \"$BRANCH\""
  exit 1
fi

systemctl stop isabelle-phabricator-phd
systemctl stop """ + webserver.system_name,
      body =
"""echo -e "\nUpgrading phabricator \"$NAME\" root \"$ROOT\" ..."
for REPO in arcanist phabricator
do
  cd "$ROOT/$REPO"
  echo -e "\nUpdating \"$REPO\" ..."
  git checkout "$BRANCH"
  git pull
done
echo -e "\nUpgrading storage ..."
"$ROOT/phabricator/bin/storage" upgrade --force
""",
      exit =
"""systemctl start """ + webserver.system_name + """
systemctl start isabelle-phabricator-phd""")


    /* webserver setup */

    progress.echo(webserver.user_name + " setup ...")

    val sites_dir = webserver.sites_dir
    if (!sites_dir.is_dir) error("Bad " + webserver + " sites directory " + sites_dir)

    val server_name = phabricator_name(name = name, ext = "localhost")  // alias for "localhost" for testing
    val server_url = "http://" + server_name

    webserver.php_init()

    webserver.site_init(name, server_name, config.webroot)

    config.execute("config set phabricator.base-uri " + Bash.string(server_url))

    webserver.restart()

    progress.echo("\nFurther manual configuration via " + server_url)


    /* PHP daemon */

    progress.echo("\nPHP daemon setup ...")

    val phd_log_path = Isabelle_System.make_directory(Path.explode("/var/tmp/phd"))
    Isabelle_System.chown(
      "-R " + Bash.string(daemon_user) + ":" + Bash.string(daemon_user), phd_log_path)
    Isabelle_System.chmod("755", phd_log_path)

    config.execute("config set phd.user " + Bash.string(daemon_user))
    config.execute("config set phd.log-directory /var/tmp/phd/" +
      isabelle_phabricator_name(name = name) + "/log")

    val phd_name = isabelle_phabricator_name(name = "phd")
    Linux.service_shutdown(phd_name)
    val phd_command = command_setup(phd_name, body = """"$ROOT/phabricator/bin/phd" "$@" """)
    try {
      Linux.service_install(phd_name,
"""[Unit]
Description=PHP daemon manager for Isabelle/Phabricator
After=syslog.target network.target """ + webserver.system_name + """.service mysql.service

[Service]
Type=oneshot
User=""" + daemon_user + """
Group=""" + daemon_user + """
Environment=PATH=/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin
ExecStart=""" + phd_command.implode + """ start --force
ExecStop=""" + phd_command.implode + """ stop
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target
""")
    }
    catch {
      case ERROR(msg) =>
        progress.bash("bin/phd status", cwd = config.home, echo = true).check
        error(msg)
    }
  }


  /* Isabelle tool wrapper */

  val isabelle_tool2 =
    Isabelle_Tool("phabricator_setup", "setup Phabricator server on Ubuntu Linux",
      Scala_Project.here,
      { args =>
        var mercurial_source = ""
        var repo = ""
        var package_update = false
        var name = default_name
        var options = Options.init()
        var root = ""
        var webserver = default_webserver

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

  Options are:
    -M SOURCE    install Mercurial from source: local PATH, or URL, or ":" for
                 """ + standard_mercurial_source + """
    -R DIR       repository directory (default: """ + default_repo("NAME") + """)
    -U           full update of system packages before installation
    -n NAME      Phabricator installation name (default: """ + quote(default_name) + """)
    -o OPTION    override Isabelle system OPTION (via NAME=VAL or NAME)
    -r DIR       installation root directory (default: """ + default_root("NAME") + """)
    -w NAME      webserver name (""" +
          all_webservers.map(w => quote(w.user_name)).mkString (" or ") +
          ", default: " + quote(default_webserver.user_name) + """)

  Install Phabricator as Linux service, based on webserver + PHP + MySQL.

  The installation name (default: """ + quote(default_name) + """) is mapped to a regular
  Unix user; this is relevant for public SSH access.
""",
          "M:" -> (arg => mercurial_source = (if (arg == ":") standard_mercurial_source else arg)),
          "R:" -> (arg => repo = arg),
          "U" -> (_ => package_update = true),
          "n:" -> (arg => name = arg),
          "o:" -> (arg => options = options + arg),
          "r:" -> (arg => root = arg),
          "w:" -> (arg => webserver = get_webserver(arg)))

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

        val progress = new Console_Progress

        phabricator_setup(options, name = name, root = root, repo = repo, webserver = webserver,
          package_update = package_update, mercurial_source = mercurial_source, progress = progress)
      })



  /** setup mail **/

  val mailers_template: String =
    """[
  {
    "key": "example.org",
    "type": "smtp",
    "options": {
      "host": "mail.example.org",
      "port": 465,
      "user": "[e-mail]",
      "password": "********",
      "protocol": "ssl",
      "message-id": true
    }
  }
]"""

  def phabricator_setup_mail(
    name: String = default_name,
    config_file: Option[Path] = None,
    test_user: String = "",
    progress: Progress = new Progress
  ): Unit = {
    Linux.check_system_root()

    val config = get_config(name)
    val default_config_file = config.root + default_mailers

    val mail_config = config_file getOrElse default_config_file

    def setup_mail: Unit = {
      progress.echo("Using mail configuration from " + mail_config)
      config.execute("config set cluster.mailers --stdin < " + File.bash_path(mail_config))

      if (test_user.nonEmpty) {
        progress.echo("Sending test mail to " + quote(test_user))
        progress.bash(cwd = config.home, echo = true,
          script = """echo "Test from Phabricator ($(date))" | bin/mail send-test --subject "Test" --to """ +
            Bash.string(test_user)).check
      }
    }

    if (config_file.isEmpty) {
      if (!default_config_file.is_file) {
        File.write(default_config_file, mailers_template)
        Isabelle_System.chmod("600", default_config_file)
      }
      if (File.read(default_config_file) == mailers_template) {
        progress.echo("Please invoke the tool again, after providing details in\n  " +
          default_config_file.implode + "\n")
      }
      else setup_mail
    }
    else setup_mail
  }


  /* Isabelle tool wrapper */

  val isabelle_tool3 =
    Isabelle_Tool("phabricator_setup_mail", "setup mail for one Phabricator installation",
      Scala_Project.here,
      { args =>
        var test_user = ""
        var name = default_name
        var config_file: Option[Path] = None

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

  Options are:
    -T USER      send test mail to Phabricator user
    -f FILE      config file (default: """ + default_mailers + """ within Phabricator root)
    -n NAME      Phabricator installation name (default: """ + quote(default_name) + """)

  Provide mail configuration for existing Phabricator installation.
""",
          "T:" -> (arg => test_user = arg),
          "f:" -> (arg => config_file = Some(Path.explode(arg))),
          "n:" -> (arg => name = arg))

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

        val progress = new Console_Progress

        phabricator_setup_mail(name = name, config_file = config_file,
          test_user = test_user, progress = progress)
      })



  /** setup ssh **/

  /* sshd config */

  private val Port = """^\s*Port\s+(\d+)\s*$""".r
  private val No_Port = """^#\s*Port\b.*$""".r
  private val Any_Port = """^#?\s*Port\b.*$""".r

  def conf_ssh_port(port: Int): String =
    if (port == default_system_port) "#Port " + default_system_port else "Port " + port

  def read_ssh_port(conf: Path): Int = {
    val lines = split_lines(File.read(conf))
    val ports =
      lines.flatMap({
        case Port(Value.Int(p)) => Some(p)
        case No_Port() => Some(default_system_port)
        case _ => None
      })
    ports match {
      case List(port) => port
      case Nil => error("Missing Port specification in " + conf)
      case _ => error("Multiple Port specifications in " + conf)
    }
  }

  def write_ssh_port(conf: Path, port: Int): Boolean = {
    val old_port = read_ssh_port(conf)
    if (old_port == port) false
    else {
      val lines = split_lines(File.read(conf))
      val lines1 = lines.map({ case Any_Port() => conf_ssh_port(port) case line => line })
      File.write(conf, cat_lines(lines1))
      true
    }
  }


  /* phabricator_setup_ssh */

  def phabricator_setup_ssh(
    server_port: Int = default_server_port,
    system_port: Int = default_system_port,
    progress: Progress = new Progress
  ): Unit = {
    Linux.check_system_root()

    val configs = read_config()

    if (server_port == system_port) {
      error("Port for Phabricator sshd coincides with system port: " + system_port)
    }

    val sshd_conf_system = Path.explode("/etc/ssh/sshd_config")
    val sshd_conf_server = sshd_conf_system.ext(isabelle_phabricator_name())

    val ssh_name = isabelle_phabricator_name(name = "ssh")
    Linux.service_shutdown(ssh_name)

    val old_system_port = read_ssh_port(sshd_conf_system)
    if (old_system_port != system_port) {
      progress.echo("Reconfigurig system ssh service")
      Linux.service_shutdown("ssh")
      write_ssh_port(sshd_conf_system, system_port)
      Linux.service_start("ssh")
    }

    progress.echo("Configuring " + ssh_name + " service")

    val ssh_command = command_setup(ssh_name, body =
"""if [ "$1" = "$NAME" ]
then
  exec "$ROOT/phabricator/bin/ssh-auth" "$@"
fi""", exit = "exit 1")

    File.write(sshd_conf_server,
"""# OpenBSD Secure Shell server for Isabelle/Phabricator
AuthorizedKeysCommand """ + ssh_command.implode + """
AuthorizedKeysCommandUser """ + daemon_user + """
AuthorizedKeysFile none
AllowUsers """ + configs.map(_.name).mkString(" ") + """
Port """ + server_port + """
Protocol 2
PermitRootLogin no
AllowAgentForwarding no
AllowTcpForwarding no
PrintMotd no
PrintLastLog no
PasswordAuthentication no
ChallengeResponseAuthentication no
PidFile /var/run/""" + ssh_name + """.pid
""")

    Linux.service_install(ssh_name,
"""[Unit]
Description=OpenBSD Secure Shell server for Isabelle/Phabricator
After=network.target auditd.service isabelle-phabricator-phd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Service]
EnvironmentFile=-/etc/default/ssh
ExecStartPre=/usr/sbin/sshd -f """ + sshd_conf_server.implode + """ -t
ExecStart=/usr/sbin/sshd -f """ + sshd_conf_server.implode + """ -D $SSHD_OPTS
ExecReload=/usr/sbin/sshd -f """ + sshd_conf_server.implode + """ -t
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartPreventExitStatus=255
Type=notify
RuntimeDirectory=sshd-phabricator
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
Alias=""" + ssh_name + """.service
""")

    for (config <- configs) {
      progress.echo("phabricator " + quote(config.name) + " port " +  server_port)
      config.execute("config set diffusion.ssh-port " + Bash.string(server_port.toString))
      if (server_port == default_system_port) config.execute("config delete diffusion.ssh-port")
    }
  }


  /* Isabelle tool wrapper */

  val isabelle_tool4 =
    Isabelle_Tool("phabricator_setup_ssh", "setup ssh service for all Phabricator installations",
      Scala_Project.here,
      { args =>
        var server_port = default_server_port
        var system_port = default_system_port

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

  Options are:
    -p PORT      sshd port for Phabricator servers (default: """ + default_server_port + """)
    -q PORT      sshd port for the operating system (default: """ + default_system_port + """)

  Configure ssh service for all Phabricator installations: a separate sshd
  is run in addition to the one of the operating system, and ports need to
  be distinct.

  A particular Phabricator installation is addressed by using its
  name as the ssh user; the actual Phabricator user is determined via
  stored ssh keys.
""",
          "p:" -> (arg => server_port = Value.Int.parse(arg)),
          "q:" -> (arg => system_port = Value.Int.parse(arg)))

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

        val progress = new Console_Progress

        phabricator_setup_ssh(
          server_port = server_port, system_port = system_port, progress = progress)
      })



  /** conduit API **/

  object API {
    /* user information */

    sealed case class User(
      id: Long,
      phid: String,
      name: String,
      real_name: String,
      roles: List[String]
    ) {
      def is_valid: Boolean =
        roles.contains("verified") &&
        roles.contains("approved") &&
        roles.contains("activated")
      def is_admin: Boolean = roles.contains("admin")
      def is_regular: Boolean = !(roles.contains("bot") || roles.contains("list"))
    }


    /* repository information */

    sealed case class Repository(
      vcs: VCS,
      id: Long,
      phid: String,
      name: String,
      callsign: String,
      short_name: String,
      importing: Boolean,
      ssh_url: String
    ) {
      def is_hg: Boolean = vcs == VCS.hg
    }

    enum VCS { case hg, git, svn }

    def read_vcs(s: String): VCS =
      try { VCS.valueOf(s) }
      catch { case _: IllegalArgumentException => error("Unknown vcs type " + quote(s)) }

    def edits(typ: String, value: JSON.T): List[JSON.Object.T] =
      List(JSON.Object("type" -> typ, "value" -> value))

    def opt_edits(typ: String, value: Option[JSON.T]): List[JSON.Object.T] =
      value.toList.flatMap(edits(typ, _))


    /* result with optional error */

    sealed case class Result(result: JSON.T, error: Option[String]) {
      def ok: Boolean = error.isEmpty
      def get: JSON.T = if (ok) result else Exn.error(error.get)

      def get_value[A](unapply: JSON.T => Option[A]): A =
        unapply(get) getOrElse Exn.error("Bad JSON result: " + JSON.Format(result))

      def get_string: String = get_value(JSON.Value.String.unapply)
    }

    def make_result(json: JSON.T): Result = {
      val result = JSON.value(json, "result").getOrElse(JSON.Object.empty)
      val error_info = JSON.string(json, "error_info")
      val error_code = JSON.string(json, "error_code")
      Result(result, error_info orElse error_code)
    }


    /* context for operations */

    def apply(server: String, port: Int = 0): API = new API(server, port)
  }

  final class API private(server: String, port: Int) {
    /* connection */

    private def port_suffix: String = if (port > 0) ":" + port else ""
    override def toString: String = server + port_suffix
    def hg_url: String = "ssh://" + server + port_suffix


    /* execute methods */

    def execute_raw(method: String, params: JSON.T = JSON.Object.empty): JSON.T = {
      Isabelle_System.with_tmp_file("params", "json") { params_file =>
        File.write(params_file, JSON.Format(JSON.Object("params" -> JSON.Format(params))))
        val result =
          Isabelle_System.bash(
            SSH.client_command(port = port) + " -- " + Bash.string(server) +
            " conduit " + Bash.string(method) + " < " + File.bash_path(params_file)).check
        JSON.parse(result.out, strict = false)
      }
    }

    def execute(method: String, params: JSON.T = JSON.Object.empty): API.Result =
      API.make_result(execute_raw(method, params = params))

    def execute_search[A](
      method: String,
      params: JSON.Object.T,
      unapply: JSON.T => Option[A]
    ): List[A] = {
      val results = new mutable.ListBuffer[A]
      var after = ""

      var cont = true
      while (cont) {
        val result =
          execute(method, params = params ++ JSON.optional("after" -> proper_string(after)))
        results ++= result.get_value(JSON.list(_, "data", unapply))
        after = result.get_value(JSON.value(_, "cursor", JSON.string0(_, "after")))
        cont = after.nonEmpty
      }

      results.toList
    }

    def ping(): String = execute("conduit.ping").get_string


    /* users */

    lazy val user_phid: String = execute("user.whoami").get_value(JSON.string(_, "phid"))
    lazy val user_name: String = execute("user.whoami").get_value(JSON.string(_, "userName"))

    def get_users(
      all: Boolean = false,
      phid: String = "",
      name: String = ""
    ): List[API.User] = {
      val constraints: JSON.Object.T =
        (for { (key, value) <- List("phids" -> phid, "usernames" -> name) if value.nonEmpty }
          yield (key, List(value))).toMap

      execute_search("user.search",
          JSON.Object("queryKey" -> (if (all) "all" else "active"), "constraints" -> constraints),
            data => JSON.value(data, "fields", fields =>
              for {
                id <- JSON.long(data, "id")
                phid <- JSON.string(data, "phid")
                name <- JSON.string(fields, "username")
                real_name <- JSON.string0(fields, "realName")
                roles <- JSON.strings(fields, "roles")
              } yield API.User(id, phid, name, real_name, roles)))
    }

    def the_user(phid: String): API.User =
      get_users(phid = phid) match {
        case List(user) => user
        case _ => error("Bad user PHID " + quote(phid))
      }


    /* repositories */

    def get_repositories(
      all: Boolean = false,
      phid: String = "",
      callsign: String = "",
      short_name: String = ""
    ): List[API.Repository] = {
      val constraints: JSON.Object.T =
        (for {
          (key, value) <- List("phids" -> phid, "callsigns" -> callsign, "shortNames" -> short_name)
          if value.nonEmpty
        } yield (key, List(value))).toMap

      execute_search("diffusion.repository.search",
          JSON.Object("queryKey" -> (if (all) "all" else "active"), "constraints" -> constraints),
            data => JSON.value(data, "fields", fields =>
              for {
                vcs_name <- JSON.string(fields, "vcs")
                id <- JSON.long(data, "id")
                phid <- JSON.string(data, "phid")
                name <- JSON.string(fields, "name")
                callsign <- JSON.string0(fields, "callsign")
                short_name <- JSON.string0(fields, "shortName")
                importing <- JSON.bool(fields, "isImporting")
              }
              yield {
                val vcs = API.read_vcs(vcs_name)
                val url_path =
                  if (short_name.isEmpty) "/diffusion/" + id else "/source/" + short_name
                val ssh_url =
                  vcs match {
                    case API.VCS.hg => hg_url + url_path
                    case API.VCS.git => hg_url + url_path + ".git"
                    case API.VCS.svn => ""
                  }
                API.Repository(vcs, id, phid, name, callsign, short_name, importing, ssh_url)
              }))
    }

    def the_repository(phid: String): API.Repository =
      get_repositories(phid = phid) match {
        case List(repo) => repo
        case _ => error("Bad repository PHID " + quote(phid))
      }

    def create_repository(
      name: String,
      callsign: String = "",    // unique name, UPPERCASE
      short_name: String = "",  // unique name
      description: String = "",
      public: Boolean = false,
      vcs: API.VCS = API.VCS.hg
    ): API.Repository = {
      require(name.nonEmpty, "bad repository name")

      val transactions =
        API.edits("vcs", vcs.toString) :::
        API.edits("name", name) :::
        API.opt_edits("callsign", proper_string(callsign)) :::
        API.opt_edits("shortName", proper_string(short_name)) :::
        API.opt_edits("description", proper_string(description)) :::
        (if (public) Nil
         else API.edits("view", user_phid) ::: API.edits("policy.push", user_phid)) :::
        API.edits("status", "active")

      val phid =
        execute("diffusion.repository.edit", params = JSON.Object("transactions" -> transactions))
          .get_value(JSON.value(_, "object", JSON.string(_, "phid")))

      execute("diffusion.looksoon", params = JSON.Object("repositories" -> List(phid))).get

      the_repository(phid)
    }
  }
}