#!/bin/sh
# 
if [ "$1" = "prereqs" ]; then
  exit 0
fi

quiet=n


. /scripts/functions
# if break=swapon STOP here
maybe_break swapon

. /conf/tcos.conf
. /conf/tcos-run-functions


# DOCUMENTME noswap | disable swap file creation (swap partition is used always, if found)
noswap=$(read_cmdline_var "noswap" "0")
if [ ${noswap} = 1 ]; then
  _log "SWAPON swap disabled from cmdline"
  exit 0
fi


############ VARS ###############
# need 64 mb of free space (in kb)
need_free_space=65536

mem_max=$(grep MemTotal /proc/meminfo | awk '{print $2}')
mem_max_dd=901120

if [ ${need_free_space} -ge ${mem_max} ] ; then
 # mem_max - 10 Mb
 need_free_space=$(($mem_max-10240))
fi

if [ ${need_free_space} -ge ${mem_max_dd} ];then
 need_free_space=${mem_max_dd}
fi

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

swap_parts_num=$(grep ^/dev /etc/fstab|grep -c swap)
swap_parts_devs=$(grep ^/dev /etc/fstab|grep swap | awk '{print $1}')

ext3_parts_num=$(grep ^/dev /etc/fstab|grep -c ext3)
ext3_parts_devs=$(grep ^/dev /etc/fstab|grep ext3 | awk '{print $1}')

fat32_parts_num=$(grep ^/dev /etc/fstab|grep -c vfat)
fat32_parts_devs=$(grep ^/dev /etc/fstab|grep vfat | awk '{print $1}')

######### FUNCTIONS ##########

check_if_swaps() {
 # exit if swap is mounted
 if [ $(grep -c -v ^Filename /proc/swaps ) != 0 ]; then
   _log "SWAPON have swap !!!"
   log_end_msg 0
   exit 0
 fi
}

mount_exits_swap() {
 for dev in $1 ; do
  swapon ${dev}
 done
}


swap_mnt_file=/mnt/tmp/swap.file

# check if /mnt/tmp is mounted and create swap file into /mnt/tmp
create_swap () {
  if [ $(grep -c /mnt/tmp /proc/mounts) -gt 0 ]; then
    # have /mnt/tmp !!!!
    # check if file exists
     if [ -f ${swap_mnt_file} ]; then
       # file exists, mount
       swapon ${swap_mnt_file} >> /tmp/initramfs.debug 2>&1
     else
       # file not exists, create it
       dd if=/dev/zero of=${swap_mnt_file} bs=${need_free_space}k count=1 >> /tmp/initramfs.debug 2>&1
       mkswap ${swap_mnt_file} >> /tmp/initramfs.debug 2>&1
       swapon ${swap_mnt_file} >> /tmp/initramfs.debug 2>&1
     fi
  fi

}



############# begin code ############

log_begin_msg "Active swap partitions"

# first we search for a swap mounted and exit
 _log "SWAPON checking swap mounted partitions"
 check_if_swaps

# no swap partition, create swap file in /mnt/tmp (if mounted)
 create_swap



log_begin_msg "SWAP: no swap avalaible"
# if here we have no swap
_log "SWAP no swap avalaible"
log_end_msg 0

echo 30 > /tmp/progress
update_progress
exit 0