#*******************************************************************************
# E.S.O. - ALMA project
#
#
# who       when        what
# --------  ----------  ----------------------------------------------
# sturolla  2005-09-07  created
#

#************************************************************************
#   NAME
#
#   SYNOPSIS
#
#   DESCRIPTION
#   The function os_discovery returns, for linux distributions
#   the distribution name and the release number
#   These are the distribution covered, return value in $DISTRO
#   RedHat Linux 	- RHLX
#   Redhat Enterprise	- RHEL
#   Scientific Linux    - SL
#   Fedorca Core	- FC
#   Gentoo		- GENTOO
#   Debian		- DEBIAN
#   Mandrake Linux	- MDRK
# 
#   The release number is returned in variable $REL
#
#   FILES
#   depending on distributions, normally all the /etc/*release files
#   For example:
#   RedHat     : /etc/redhat-release
#   Fedora     : /etc/redhat-release
#   Debian     : /etc/debian-version
#
#   ENVIRONMENT
#
#   RETURN VALUES
#   Two variables $DISTRO and $REL containing Linux Distribution name and release number
#
#   CAUTIONS AND LIMITATIONS
#
#   EXAMPLES
#   % os_discovery
#   % echo "$DISTRO - $REL"
#   RHLX - 9
#
#
#   SEE ALSO
#
#   BUGS
#
#------------------------------------------------------------------------
#


setup_colors() {
  if [ "$OS" == "LINUX" ]; then
      BOOTUP=color
  else
      BOOTUP=none
  fi
  RES_COL=60
  MOVE_TO_COL="echo -en \\033[${RES_COL}G"
  SETCOLOR_SUCCESS="echo -en \\033[1;32m"
  SETCOLOR_FAILURE="echo -en \\033[1;31m"
  SETCOLOR_WARNING="echo -en \\033[1;33m"
  SETCOLOR_NORMAL="echo -en \\033[0;39m"
}

echo_success() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_SUCCESS
  echo -n $"  OK  "
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r\n"
  return 0
}

echo_failure() {
  [ "$BOOTUP" = "color" ] && $MOVE_TO_COL
  echo -n "["
  [ "$BOOTUP" = "color" ] && $SETCOLOR_FAILURE
  echo -n $"==> FAILED"
  [ "$BOOTUP" = "color" ] && $SETCOLOR_NORMAL
  echo -n "]"
  echo -ne "\r\n"
  return 1
}

os_discovery ()
{
	#   Solaris: uname command is enough
	#
	#   Linux
	# RedHat     : /etc/redhat-release
	# Fedora     : /etc/redhat-release
	# Debian     : /etc/debian-version
	# Slackware  : /etc/slackware-version
	#
	# RHEL
	# Red Hat Enterprise Linux WS release 4 (Nahant Update 1)
	######################################################
	# SL
	# Scientific Linux SL release 4.1 (Beryllium)
	######################################################
	# RH
	# Red Hat Linux release 9 (Shrike)
	######################################################
	# Fedora
	# Fedora Core release 4 (Stentz)
	######################################################
	# Mandrake
	# Mandrakelinux release 10.1 (Cooker) for i586
	######################################################
	# Gentoo
	# Gentoo Base System version 1.6.12

	# By Default the OS/Release are unknown
	DISTRO='UNKNOWN'
	REL='UNKNOWN'

	# Here start the research
	OS=`uname -s`


	# First RedHat and connected distributions (Scientific Linux, Fedora)
	case $OS in
		'Linux'   )     # Need to know what distribution and get release number
				check_linux;;
		'SunOS' )	# Much easier, uname command is enough
				check_solaris;;
	esac
}

check_solaris ()
{
	OS='SOLARIS'
	DISTRO='SOLARIS'
	REL=`uname -r`
}

check_linux ()
{
	
	OS='LINUX'
	# Standard release files for different distributions
	RH=/etc/redhat-release
	DB=/etc/debian-version
	SL=/etc/slackware-version
	SU=/etc/SuSE-release
	GT=/etc/gentoo-release
	MD=/etc/mandrake-release

	if [ -f $RH ] 
   	then
		INFO=`cat $RH`
		# It can be Redhat, Scientific Linux or Fedora
		# Check with first word
		DUMMY=`cat $RH | cut -d' ' -f1`

		case $DUMMY 
		in
			'Red') 		# It can be Redhat standard or RedHat Enterprise
					case `cat $RH | cut -d' ' -f3` 
					in
						'Linux') # Old RedHat Free distribution (7.3, 8.0 or 9)
					 		DISTRO='RHLX'
					 		REL=`cat $RH | cut -d' ' -f5` ;;
						'Enterprise') # RedHat Enterprise
					 		DISTRO='RHEL'
					 		REL=`cat $RH | cut -d' ' -f7` ;;
					esac;;
			'Scientific') 	# Scientific Linux
					DISTRO='SL'
					REL=`cat $RH | cut -d' ' -f5` ;;
			'Fedora') 	# Fedora Core 
					DISTRO='FEDORA'
					REL=`cat $RH | cut -d' ' -f4` ;;
		esac
	fi

	# then let's check other distributions, first SuSe
	if [ -f $SU ]
	then
		# SuSe 
		DISTRO=SUSE
		REL=`grep -i SuSe $SU |  cut -d' ' -f3` 
	fi

	# Then Mandrake
	if [ -f $MD ] 
	then
		DISTRO='MDRK'
		REL=`cat $MD | cut -d' ' -f3` 
	fi

	# Debian
	if [ -f $DB ] 
	then
		DISTRO='DEBIAN'
		REL=""
	fi
	
	if [ -f $GT ] 
	then
		DISTRO='GENTOO'
		REL=`cat $GT` 
	fi
}