#!/bin/sh

# build-rw --- creates a writable kiosk directory.
# See http://www.dnalounge.com/backstage/src/kiosk/ for details.
# Copyright (c) 2000, 2003, 2004 by The DNA Lounge <info@dnalounge.com>
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation.  No representations are made about the suitability of this
# software for any purpose.  It is provided "as is" without express or 
# implied warranty.
#
# Created: 28-Apr-2001, Jamie Zawinski <jwz@dnalounge.com>

verbose=
dir=

make_rw() {

  if [ ! -d $dir ]; then
    echo "$0: directory $dir/ does not exist" >&2
    exit 1
  fi

  if [ ! -d $dir/lost+found ]; then
    echo "$0: directory $dir/ does not look right..." >&2
    exit 1
  fi

  set -x

  umask 022
  chmod 755 $dir

  rm -rf $dir/*
  cd $dir

  mkdir lost+found

########################################################################

#    We only need to create directories in here which the client
#    needs to write to, or which contain files that the client needs to
#    write to.

  mkdir boot dev etc home tmp var
  mkdir -p etc/ntp \
           etc/ssh \
           etc/ntp \
           home/guest \
           lib \
           var/lock/console var/lock/subsys \
           var/cache var/log var/preserve var/run var/run/netreport \
           var/spool/at var/spool/cron \
           var/spool/mqueue var/spool/clientmqueue \
           var/state/misc \
           var/lib \
           var/tmp
  chmod 1777 var/tmp
  chown ntp.ntp etc/ntp
  chown smmsp.smmsp var/spool/clientmqueue
  chmod 770 var/spool/clientmqueue
  
#    Copy over the devices we need:

  cp -a /dev/{audio*,dsp*,initctl,log,tty,tty?,ttyS?,cua?,ttyp?,pty*}   \
        /dev/{console,null,mem,mouse,psaux,gpmdata,*random} \
        dev/

#   Create placeholders for these files, which we will fill
#   in eventually:

  touch boot/kernel.h \
        etc/HOSTNAME \
        etc/issue \
        etc/issue.net \
        etc/ssh/ssh_host_key \
        etc/ssh/ssh_host_key.pub \
        etc/ssh/ssh_host_rsa_key \
        etc/ssh/ssh_host_rsa_key.pub \
        etc/ssh/ssh_host_dsa_key \
        etc/ssh/ssh_host_dsa_key.pub \
        etc/ssh/ssh_random_seed \
        etc/ssh/moduli \
        var/lib/random-seed \
        var/log/lastlog \
        etc/ntp/drift

#    Now, in each directory we've created, fill it with symlinks to
#    every existing file in "/ro" (excepting the files we've already
#    created.)  Ignore the ``File exists'' and ``cannot overwrite
#    directory'' errors.

  for d in `find * -type d`; do
    ln -s /ro/$d/* $d
  done

#   But not here:

  rm var/{log,lock,lock/subsys,preserve,run,spool/mqueue}/*
  rm -rf var/cache/*

  rm etc/named.* var/named
  rm etc/ntp/{drift,keys}
  cp -p /etc/ntp/{drift,keys} etc/ntp

  rm -rf tmp
  ln -s var/tmp tmp

  rm etc/named.* var/named

  rm -rf home
  mkdir -p home/guest
  chown guest.guest home/guest
  ln -s /ro2/home/guest-ro home

########################################################################

  # these kiosks have a cd on hda
  rm dev/cdrom
  ln -s hda dev/cdrom

  # because of the funny place we keep /usr/local
  ln -s /ro2/home/local home/local 

  # Clean up some extra crap that might have gotten copied over

  find . \(     -name core -o -name a.out -o -name %backup%~		\
             -o -name '*~' -o -name '#*' -o -name '*#'			\
             -o -name '.#*'						\
             -o -name '.*~'						\
             -o -name '%*'						\
             -o -name '*.orig' -o -name '*.rej' -o -name '*.bak'	\
             -o -name '*.rpmsave' -o -name '*.rpmnew' -o -name '*.rpmorig' \
	     -o -name '.saves-*'					\
             -o -name '[*]'						\
          \) -print |
  xargs rm -f

  # Install the pregenerated ssh host keys
  fix_ssh
}


fix_ssh() {
  pwd
  cp -a ../share/etc/ssh/sshd_config \
        ../ssh_keys/$dir/ssh_host_key \
        ../ssh_keys/$dir/ssh_host_key.pub \
        ../ssh_keys/$dir/ssh_host_rsa_key \
        ../ssh_keys/$dir/ssh_host_rsa_key.pub \
        ../ssh_keys/$dir/ssh_host_dsa_key \
        ../ssh_keys/$dir/ssh_host_dsa_key.pub \
        etc/ssh/
}


usage() {
  echo "usage: `basename $0` [-v] output-directory"
  exit 1
}

main() {
  while [ $# -gt 0 ]; do
    case $1 in
     -v)
       verbose=1
       ;;
     *)
       if [ -z "$dir" ]; then
         dir=$1
       else
         usage
       fi
       ;;
    esac
    shift
  done

  if [ -z "$dir" ]; then
    usage
  fi

  make_rw
}

main "$@"
exit 0