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: / etc / init.d /
Filename : x11-common
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#!/bin/sh
# /etc/init.d/x11-common: set up the X server and ICE socket directories
### BEGIN INIT INFO
# Provides:          x11-common
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     S
# Default-Stop:
# Short-Description: set up the X server and ICE socket directories
### END INIT INFO

set -e

PATH=/usr/bin:/usr/sbin:/bin:/sbin
SOCKET_DIR=.X11-unix
ICE_DIR=.ICE-unix

. /lib/lsb/init-functions
if [ -f /etc/default/rcS ]; then
  . /etc/default/rcS
fi

do_restorecon () {
  # Restore file security context (SELinux).
  if which restorecon >/dev/null 2>&1; then
    restorecon "$1"
  fi
}

# create a directory in /tmp.
# assumes /tmp has a sticky bit set (or is only writeable by root)
set_up_dir () {
  DIR="/tmp/$1"

  if [ "$VERBOSE" != no ]; then
    log_progress_msg "$DIR"
  fi
  # if $DIR exists and isn't a directory, move it aside
  if [ -e $DIR ] && ! [ -d $DIR ] || [ -h $DIR ]; then
    mv "$DIR" "$(mktemp -d $DIR.XXXXXX)"
  fi

  error=0
  while :; do
    if [ $error -ne 0 ] ; then
      # an error means the file-system is readonly or an attacker
      # is doing evil things, distinguish by creating a temporary file,
      # but give up after a while.
      if [ $error -gt 5 ]; then
        log_failure_msg "failed to set up $DIR"
        return 1
      fi
      fn="$(mktemp /tmp/testwriteable.XXXXXXXXXX)" || return 1
      rm "$fn"
    fi
    mkdir -p -m 01777 "$DIR" || { rm "$DIR" || error=$((error + 1)) ; continue ; }
    case "$(LC_ALL=C stat -c '%u %g %a %F' "$DIR")" in
      "0 0 1777 directory")
        # everything as it is supposed to be
        break
        ;;
      "0 0 "*" directory")
        # as it is owned by root, cannot be replaced with a symlink:
        chmod 01777 "$DIR"
        break
        ;;
      *" directory")
        # if the chown succeeds, the next step can change it savely
        chown -h root:root "$DIR" || error=$((error + 1))
        continue
        ;;
      *)
        log_failure_msg "failed to set up $DIR"
        return 1
        ;;
    esac
  done
  do_restorecon "$DIR"

  return 0
}

do_status () {
    if [ -d "/tmp/$ICE_DIR" ] && [ -d "/tmp/$SOCKET_DIR" ]; then
      return 0
    else
      return 4
    fi
}

case "$1" in
  start)
    if [ "$VERBOSE" != no ]; then
      log_begin_msg "Setting up X socket directories..."
    fi
    set_up_dir "$SOCKET_DIR"
    set_up_dir "$ICE_DIR"
    if [ "$VERBOSE" != no ]; then
      log_end_msg 0
    fi
  ;;

  restart|reload|force-reload)
    /etc/init.d/x11-common start
  ;;

  stop)
   :
  ;;

  status)
    do_status
  ;;
  *)
    log_success_msg "Usage: /etc/init.d/x11-common {start|stop|status|restart|reload|force-reload}"
    exit 1
    ;;
esac

exit 0

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