source: BLFS/func_dependencies@ 1d2f9d4

#!/bin/bash
#
# $Id$
#
set -e

#-----------------------#
do_dependencies()  {    #  Loop to find sub-dependencies
#-----------------------#
  set -e
  local PKG=$1
  local saveIFS=$IFS
  local DEP_LV=$DEP_LEVEL
  local line line2 DEP

  echo -e "\tPKG is $PKG" >> depure.txt
  echo -e "\tDEP_LEVEL for $PKG is $DEP_LV\n" >> depure.txt

  #  If a premade xinclude file esist, use it. If not, create one
  if [[ -f xincludes/$PKG.xinc ]] ; then
    echo -e "\tReusing xinclude file for PKG $PKG" >> depure.txt
    IFS=$'\x0A'
    for line in `cat xincludes/$PKG.xinc` ; do
      IFS=$saveIFS
      # Remove the Xinclude entry if found. We want the most newer one.
      # Using double quotes to let bash expand variables.
      # Remove also the empty line created. Can not be done in one step
      # due that d requires the pattner between /, but we have a lot of /
      # inside the pattner.
      sed -e "s,^[[:space:]]*$line,," -e '/./!d' -i $TARGET-index.xml.tmp
      # Write the XInclude
      echo -e "$line" >> $TARGET-index.xml.tmp
    done
  else
    # Start with a clean $PKG.xinc.tmp file
    > xincludes/$PKG.xinc.tmp
    for DEP in `cat dependencies/$PKG.dep`; do
      # Especial packages (a lot of hacks)
      case $DEP in
        # The proper version of DB is installed in LFS
        db ) continue ;;
        # ID value don't have their own XML package file
        hal-requirements ) continue ;;
        perl-* | tk-perl ) DEP=perl-modules ;;
        # Orphan links (proper link must be created when generating the book)
        arts ) DEP=aRts ;; # That should be fixed in the BLFS book
        # Set values for alternative packages
        # X is a meta-package, thus handled in another way.
        LPRng | cups ) DEP=$PRINT_SERVER ;;
        mitkrb | heimdal ) DEP=$KBR5 ;;
        gs | espgs ) DEP=$GHOSTSCRIPT ;;
        MTA ) DEP=$MAIL_SERVER ;; # The BLFS book need be fixed yet for that
      esac
      echo -e "\tDEP for $PKG is $DEP" >> depure.txt
      case $DEP in
        # Circular dependencies at level 3
        cracklib | docbook-utils | libxml2 | cyrus-sasl | alsa-lib | \
        unixodbc | cups | libexif | esound | gimp )
          [[ "$DEP_LV" = "3" ]] && DEP_LV=2
          ;;
        * ) DEP_LV=$DEP_LEVEL ;;
      esac
      echo -e "\tDEP_LEVEL for $DEP is $DEP_LV" >> depure.txt
      # XML file of dependency package
      DEP_XML=`grep "^$DEP[[:space:]]" ../packages | cut -f2`
      echo -e "\t\tDEP_XML is $DEP_XML\n" >> depure.txt
      case $DEP in
        x-window-system ) ;; # No page for that (proper link must be created when generating the book)
        xorg7 ) ;; # This page will be dump in the xorg7.xinc file
        * )
          # Remove the Xinclude entry if found
          sed -e "s,^[[:space:]]*$ENTRY_START$DEP_XML$ENTRY_END,," \
              -e '/./!d' -i xincludes/$PKG.xinc.tmp
          # Write the XInclude
          echo -e "    $ENTRY_START$DEP_XML$ENTRY_END" >> xincludes/$PKG.xinc.tmp
          ;;
      esac
      # If not already created, create its dependencies list
      if [[ ! -f dependencies/$DEP.dep ]] ; then
        case $DEP in
          # Meta-packages at dependency level (ugly *.dep files, but work for now)
          alsa ) # When dependency "alsa", use all alsa-* packages
            echo -e "alsa-oss\nalsa-firmware\nalsa-tools\nalsa-utils\n \
                     alsa-plugins\nalsa-lib" > dependencies/$DEP.dep
            ;;
          x-window-system ) # X11 alternatives
            echo -e "x-config\nx-setup\n$X11" > dependencies/$DEP.dep
            ;;
          xorg7 ) # All Xorg7 packages except Xterm (circular dependency)
            echo -e "rman\nxorg7-driver\nxorg7-server\nluit\nxorg7-font\n \
                     xorg7-data\nxorg7-app\nxbitmaps\nmesalib\nlibdrm\n \
                     xorg7-lib\nxorg7-util\nxorg7-proto" > dependencies/$DEP.dep
            ;;
          * ) xsltproc --stringparam dependencies $DEP_LV \
                 -o dependencies/$DEP.dep ../dependencies.xsl ../$DEP_XML
            ;;
        esac
      fi
      # If needed, process its dependencies
      if [[ -f dependencies/$DEP.dep ]] ; then
        # If a premade xinclude file esist, include it
        if [[ -f xincludes/$DEP.xinc ]] ; then
          echo -e "\tReusing xinclude file for PKG $DEP (to solve $PKG)\n" >> depure.txt
          IFS=$'\x0A'
          for line2 in `cat xincludes/$DEP.xinc` ; do
            IFS=$saveIFS
            # Remove the Xinclude entry if found
            sed -e "s,^[[:space:]]*$line2,," -e '/./!d' -i xincludes/$PKG.xinc.tmp
            # Write the XInclude
            echo -e "$line2" >> xincludes/$PKG.xinc.tmp
          done
        # Create the xinclude file
        else
          # We will call the function from inside it
          echo -e "\nStart new loop for PKG $DEP (to solve $PKG)\n" >> depure.txt
          # We will call the function from inside it
          set +e
          do_dependencies $DEP
          set -e
          # Include it when done
          echo -e "\tUsing the new xinclude file for PKG $DEP (to solve $PKG)\n" >> depure.txt
          IFS=$'\x0A'
          for line2 in `cat xincludes/$DEP.xinc` ; do
            IFS=$saveIFS
            # Remove the Xinclude entry if found
            sed -e "s,^[[:space:]]*$line2,," -e '/./!d' -i xincludes/$PKG.xinc.tmp
            # Write the XInclude
            echo -e "$line2" >> xincludes/$PKG.xinc.tmp
          done
        fi
      fi
    done
    if [[ "$PKG" = "xorg7" ]] ; then
      # Add their XInclude
      PKG_XML=`grep "^$PKG[[:space:]]" ../packages | cut -f2`
      echo -e "    $ENTRY_START$PKG_XML$ENTRY_END" >> xincludes/$PKG.xinc.tmp
    fi
    mv xincludes/$PKG.xinc.tmp xincludes/$PKG.xinc
    echo -e "Using the new xinclude file for PKG $PKG" >> depure.txt
    IFS=$'\x0A'
    for line in `cat xincludes/$PKG.xinc` ; do
      IFS=$saveIFS
      # Remove the Xinclude entry if found.
      sed -e "s,^[[:space:]]*$line,," -e '/./!d' -i $TARGET-index.xml.tmp
      # Write the XInclude
      echo -e "$line" >> $TARGET-index.xml.tmp
    done
  fi

 echo -e "\nEnd loop for PKG $PKG\n" >> depure.txt
}