linux-live/tools/linuxkitlib

#!/bin/bash

# Functions library :: for Linux Live Kit scripts
# Author: Tomas M. <http://www.linux-live.org>
#

# =================================================================
# debug and output functions
# =================================================================

# global variable
DEBUG_IS_ENABLED=$(cat /proc/cmdline 2>/dev/null | grep debug)

debug_log()
{
   if [ "$DEBUG_IS_ENABLED" ]; then
      echo "- debug: $*" >&2
      log "- debug: $*"
   fi
}

# header
# $1 = text to show
#
header()
{
   echo """$@"""
}


# echogreen will echo $@ in green color
# $1 = text
#
echogreen()
{
   echo -ne """$@"""
}

# log - store given text in /var/log/livedbg
log()
{
   echo "$@" 2>/dev/null >>/var/log/livedbg
}

# show information about the debug shell
show_debug_banner()
{
   echo
   echo "====="
   echo ": Debugging started. Here is the root shell for you."
   echo ": Type your desired commands or hit Ctrl+D to continue booting."
   echo
}

# debug_shell
# executed when debug boot parameter is present
#
debug_shell()
{
   if [ "$DEBUG_IS_ENABLED" ]; then
      show_debug_banner
      bash < /dev/console
      echo
   fi
}

fatal()
{
   echolog
   header "Fatal error occured - $1"
   echolog "Something went wrong and we can't continue. This should never happen."
   echolog "Please reboot your computer with Ctrl+Alt+Delete ..."
   echolog
   bash < /dev/console
}


# test if the script is started by root user. If not, exit
#
allow_only_root()
{
  if [ "0$UID" -ne 0 ]; then
     echo "Only root can run $(basename $0)"; exit 1
  fi
}

# Create bundle
# call mksquashfs with apropriate arguments
# $1 = directory which will be compressed to squashfs bundle
# $2 = output file
# $3..$9 = optional arguments like -keep-as-directory or -b 123456789
#
create_bundle()
{
   debug_log "create_module" "$*"
   rm -f "$2" # overwrite, never append to existing file
   mksquashfs "$1" "$2" -comp xz -b 512K $3 $4 $5 $6 $7 $8 $9>/dev/null
}