#! /bin/sh
#
# This file is part of DisOrder
# Copyright (C) 2004, 2007-2009 Richard Kettlewell
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

set -e

. /usr/share/debconf/confmodule

add_jukebox_user() {
  adduser --quiet --system --group --shell /bin/sh --home /var/lib/disorder \
    --no-create-home jukebox
  # If it happens that there's no audio group we don't fail; perhaps only
  # network play was required.
  adduser jukebox audio || true
}

configure_init_d() {
  update-rc.d disorder defaults 92 19 > /dev/null
}

restart_server() {
  local first
  local time
  invoke-rc.d disorder restart
  # Wait for the server to start
  first=true
  time=0
  while :; do
    if disorder version >/dev/null 2>&1; then
      break
    else
      if [ $time -gt 30 ]; then
        echo
        echo "Server did not stabilise in a reasonable amount of time"
        exit 1
      fi
      if $first; then
	printf "Waiting for server to stabilise"
	first=false
      fi
      printf "."
      sleep 1
    fi
    time=`expr $time + 1`
  done
  echo
}

setup_guest() {
  echo "Checking whether guest user exists..." >&2
  TMPFILE="$(mktemp -t)"
  if disorder users > "$TMPFILE"; then
    if grep -q '^guest$' "$TMPFILE"; then
      echo "Guest user has already been set up." >&2
    else
      echo "Attempting to set up guest user..." >&2
      if disorder setup-guest; then
        echo "Created guest user." >&2
      else
        echo "Failed to create guest user." >&2
        echo "You can use 'disorder setup-guest' to do this step manually." >&2
        echo >&2
      fi
    fi
  else
    echo "Cannot determine whether guest user has been set up." >&2
    echo >&2
  fi
  rm -f "$TMPFILE"
}

fix_configuration() {
  # Once the server has started up, we can remove some of the obsolete
  # directives from the config file.
  if grep -q ^trust /etc/disorder/config; then
    echo "Removing obsolete 'trust' directive from /etc/disorder/config" >&2
    sed < /etc/disorder/config > /etc/disorder/config.new \
	's/^trust/#trust/'
    chmod 644 /etc/disorder/config.new
    mv /etc/disorder/config.new /etc/disorder/config
  fi
  if test -e /etc/disorder/config.private \
      && grep -q ^allow /etc/disorder/config.private; then
    echo "Removing obsolete 'allow' directive(s) from /etc/disorder/config.private" >&2
    u=$(umask)
    umask 077
    sed < /etc/disorder/config.private > /etc/disorder/config.private.new \
	's/^allow/#allow/'
    umask $u
    chmod 640 /etc/disorder/config.private.new
    chown root:jukebox /etc/disorder/config.private.new
    mv /etc/disorder/config.private.new /etc/disorder/config.private
  fi
}

# Create configuration from debconf answers
create_config() {
  db_get disorder/roots || true
  roots="$RET"
  db_get disorder/scratches || true
  scratches="$RET"
  db_get disorder/encoding || true
  encoding="$RET"
  db_get disorder/port || true
  port="$RET"
  db_get disorder/mail_sender || true
  mail_sender="$RET"
  db_get disorder/interface || true
  interface="$RET"
  if test "x$interface" = xnetwork; then
    db_get disorder/mcast_address || true
    mcast_address="$RET"
    db_get disorder/mcast_port || true
    mcast_port="$RET"
  fi

  mkdir -p /etc/disorder
  cat > /etc/disorder/conf.debconf.new <<EOF
# created automatically from debconf information
# do not edit manually
# run 'dpkg-reconfigure disorder' instead
EOF

  echo >> /etc/disorder/conf.debconf.new
  echo "# Collection roots"  >> /etc/disorder/conf.debconf.new
  for r in $roots; do
    echo "collection fs $encoding $r" >> /etc/disorder/conf.debconf.new
  done

  echo >> /etc/disorder/conf.debconf.new
  echo "# Scratches" >> /etc/disorder/conf.debconf.new
  for s in $scratches; do
    echo "scratch $s" >> /etc/disorder/conf.debconf.new
  done

  if test "$mail_sender" != ""; then
    echo "" >> /etc/disorder/conf.debconf.new
    echo "# Source mail address" >> /etc/disorder/conf.debconf.new
    echo "mail_sender $mail_sender" >> /etc/disorder/conf.debconf.new
  fi

  if test "$port" != none && test "$port" != ""; then
    echo >> /etc/disorder/conf.debconf.new
    echo "# Listen for remote clients" >> /etc/disorder/conf.debconf.new
    echo "listen 0.0.0.0 $port" >> /etc/disorder/conf.debconf.new
  fi

  if test "x$interface" = xnetwork; then
    echo "" >> /etc/disorder/conf.debconf.new
    echo "# Target address for RTP frames" >> /etc/disorder/conf.debconf.new
    echo "broadcast $mcast_address $mcast_port" >> /etc/disorder/conf.debconf.new
  fi

  mv /etc/disorder/conf.debconf.new /etc/disorder/conf.debconf
}

case "$1" in
configure )
  if grep -q ^jukebox: /etc/passwd; then
    :
  else
    add_jukebox_user
  fi
  chown jukebox:jukebox /var/lib/disorder
  configure_init_d
  create_config
  restart_server
  fix_configuration
  setup_guest
  ;;
reconfigure )
  create_config
  ;;
abort-upgrade )
  invoke-rc.d disorder restart
  ;;
reconfigure )
  invoke-rc.d disorder reload
  ;;
esac

db_stop