# $Id$

check_version() {
: <<inline_doc
      Tests for a minimum version level. Compares to version numbers and forces an 
        exit if minimum level not met.
      NOTE: This test will fail on versions containing alpha chars. ie. jpeg 6b
    
    usage:	check_version "2.6.2" "`uname -r`"         "KERNEL"
		check_version "3.0"   "$BASH_VERSION"      "BASH"
		check_version "3.0"   "`gcc -dumpversion`" "GCC"

    input vars: $1=min acceptable version
    		$2=version to check
		$3=app name
    externals:  --
    modifies:   --
    returns:    nothing
    on error:	write text to console and dies
    on success: write text to console and returns
inline_doc

  declare -i major minor revision change
  declare -i ref_major ref_minor ref_revision ref_change

  ref_version=$1
  tst_version=$2
  TXT=$3

  # This saves us the save/restore hassle of the system IFS value
  local IFS

  write_error_and_die() {
     echo -e "\n\t\t$TXT version -->${tst_version}<-- is too old.
		    This script requires ${ref_version} or greater\n"
     exit 1
  }

  echo -ne "${TXT}${dotSTR:${#TXT}}${L_arrow}${BOLD}${tst_version}${OFF}${R_arrow}"

#  echo -ne "$TXT:\t${L_arrow}${BOLD}${tst_version}${OFF}${R_arrow}"
  IFS=".-(p"   # Split up w.x.y.z as well as w.x.y-rc  (catch release candidates)
  set -- $ref_version # set postional parameters to minimum ver values
  ref_major=$1; ref_minor=$2; ref_revision=$3
  #
  set -- $tst_version # Set postional parameters to test version values
  major=$1; minor=$2; revision=$3
  #
  # Compare against minimum acceptable version..
  (( major > ref_major )) && echo " ..${GREEN}OK${OFF}" && return
  (( major < ref_major )) && write_error_and_die
    # major=ref_major
  (( minor < ref_minor )) && write_error_and_die
  (( minor > ref_minor )) && echo " ..${GREEN}OK${OFF}" && return
    # minor=ref_minor
  (( revision >= ref_revision )) && echo " ..${GREEN}OK${OFF}" && return

  # oops.. write error msg and die
  write_error_and_die
}

#----------------------------#
check_prerequisites() {      #
#----------------------------#

  # LFS/HLFS/CLFS prerequisites
  if [ ! "${PROGNAME}" = "hlfs" ]; then
    check_version "2.6.2"    "`uname -r`"                                       "KERNEL"
    check_version "2.0.5"    "$BASH_VERSION"                                    "BASH"
    check_version "3.0.0"    "`gcc -dumpversion`"                               "GCC"
    check_version "1.14"     "`tar --version | head -n1 | cut -d \" \" -f4`"    "TAR"
    check_version "1.12"     "`ld --version | head -n1 | cut -d\" \" -f4`"      "BINUTILS"
    bzip2Ver="`bzip2 --version 2>&1 < /dev/null | head -n1 | cut -d\" \" -f8`"
    check_version "1.0.3"    "${bzip2Ver%%,*}"                                  "BZIP2"
    check_version "5.0"      "`chown --version | head -n1 | cut -d\")\" -f2`"   "COREUTILS"
    check_version "2.8"      "`diff --version | head -n1 | cut -d \" \" -f4`"   "DIFF"
    check_version "4.1.20"   "`find --version | head -n1 | cut -d \" \" -f4`"   "FIND"
    check_version "3.0"      "`gawk --version | head -n1 | cut -d \" \" -f3`"   "GAWK"
#  /lib/libc.so.6 | head -n1 | cut -d" " -f1-7
    check_version "2.5"      "`grep --version | head -n1 | cut -d \" \" -f4`"   "GREP"
#  #echo -n "gzip: ";  gzip --version | head -n1
    check_version "3.79.1"    "`make --version | head -n1 | cut -d \" \" -f3`"  "MAKE"
    check_version "2.5.4"    "`patch --version | head -n1 | cut -d \" \" -f2`"  "PATCH"
    check_version "3.0.2"    "`sed --version | head -n1 | cut -d \" \" -f4`"    "SED"
  else
    # LFS/HLFS/CLFS prerequisites
    check_version "2.6.2" "`uname -r`"         "KERNEL"
    check_version "3.0"   "$BASH_VERSION"      "BASH"
    check_version "3.0"   "`gcc -dumpversion`" "GCC"
    check_version "1.1"   "`tar --version | head -n1 | cut -d \" \" -f4`"   "TAR"
  fi

  # Check for minimum sudo version
  SUDO_LOC="`whereis -b sudo | cut -d " " -f2`"
  if [ -x $SUDO_LOC ]; then
    sudoVer=`sudo -V | head -n1 | cut -d " " -f3`
    check_version "1.6.8"  "${sudoVer}"      "SUDO"
  else
    echo "${nl_}\"${RED}sudo${OFF}\" ${BOLD}must be installed on your system for jhalfs to run"
    exit 1
  fi

  # Check for minimum libxml2 and libxslt versions
  xsltprocVer=`xsltproc -V | head -n1 `
  libxmlVer=$(echo $xsltprocVer | cut -d " " -f3)
  libxsltVer=$(echo $xsltprocVer | cut -d " " -f5)

  # Version numbers are packed strings not xx.yy.zz format.
  check_version "2.06.20"  "${libxmlVer:0:1}.${libxmlVer:1:2}.${libxmlVer:3:2}"     "LIBXML2"
  check_version "1.01.14"  "${libxsltVer:0:1}.${libxsltVer:1:2}.${libxsltVer:3:2}"  "LIBXSLT"

  # The next versions checks are required only when BLFS_TOOL is set and
  # this dependencies has not be selected for installation
  if [[ "$BLFS_TOOL" = "y" ]] ; then

    if [[ -z "$DEP_TIDY" ]] ; then
      tidyVer=`tidy -V | cut -d " " -f9`
      check_version "2004" "${tidyVer}" "TIDY"
    fi

    # Check if the proper DocBook-XML-DTD and DocBook-XSL are correctly installed
XML_FILE="<?xml version='1.0' encoding='ISO-8859-1'?>
<?xml-stylesheet type='text/xsl' href='http://docbook.sourceforge.net/release/xsl/1.69.1/xhtml/docbook.xsl'?>
<!DOCTYPE article PUBLIC '-//OASIS//DTD DocBook XML V4.4//EN'
  'http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd'>
<article>
  <title>Test file</title>
  <sect1>
    <title>Some title</title>
    <para>Some text</para>
  </sect1>
</article>"

    if [[ -z "$DEP_DBXML" ]] ; then
      if `echo $XML_FILE | xmllint -noout -postvalid - 2>/dev/null` ; then
        check_version "4.4" "4.4" "DocBook XML DTD"
      else
        echo "Warning: not found a working DocBook XML DTD 4.4 installation"
        exit 2
      fi
    fi

    if [[ -z "$DEP_DBXSL" ]] ; then
      if `echo $XML_FILE | xsltproc --noout - 2>/dev/null` ; then
        check_version "1.69.1" "1.69.1" "DocBook XSL"
      else
        echo "Warning: not found a working DocBook XSL 1.69.1 installation"
        exit 2
      fi
    fi

  fi # end BLFS_TOOL=Y

}