#!/bin/sh
# Originally written by Jason Woodward, https://software.jaos.org/
# Modified for use in SMLinux
# 
# This script creates PACKAGES.TXT, CHECKSUMS.md5 and .meta files for use with slapt-get
# Typical usage: put all the final packages inside a directory. copy genpackagelist to
# that directory and then run 
# "./genpackagelist all"
# 
# This will create PACKAGES.TXT{.gz},
# CHECKSUMS.md5{.gz} and all the .meta files. Copy those files to a suitable directory
# which will be queried by slapt-get.

function gen_packages_txt {
 echo '' > PACKAGES.TXT
 find . -type f -name '*.meta' -exec cat {} \; >> PACKAGES.TXT
  cat PACKAGES.TXT | gzip -9 -c - > PACKAGES.TXT.gz
}

function gen_md5_checksums {
  echo '' > CHECKSUMS.md5
  find . -type f -regextype posix-egrep -regex '.*\.[tgblzikx]+$' -exec md5sum {} \; >> CHECKSUMS.md5
  cat CHECKSUMS.md5 | gzip -9 -c - > CHECKSUMS.md5.gz
}

function gen_meta {
  if [ ! -f $1 ]; then
    echo "File not found: $1"
    exit 1;
  fi

  if [ "`echo $1|grep -E '(.*{1,})\-(.*[\.\-].*[\.\-].*).[tgblzikx]{2,}[ ]{0,}$'`" == "" ]; then
	  return;
  fi

  PKGEXT=${1##*.}
  case $PKGEXT in
    tgz) DECOMPRESS=gzip ;;
    tbz) DECOMPRESS=bzip2 ;;
    tlz) DECOMPRESS=lzip ;;
    txz) DECOMPRESS=xz ;;
  esac
 
  echo "Generating meta files, package lists and md5sum files for $1..."

  # Create a unique temporary directory and untar the package inside it
  TEMPDIR=$(mktemp -d $1.XXXXXX)
  tar -xf $1 -C"$TEMPDIR"

  NAME=$(echo $1 | sed -re "s/(.*\/)(.*.$PKGEXT)$/\2/")
  LOCATION=$(echo $1 | sed -re "s/(.*)\/(.*.$PKGEXT)$/\1/")
  SIZE=$(du -bk $1 | awk '{print $1}')
  USIZE=$(expr $( $DECOMPRESS -dc $1 | wc -c) / 1024)

  if [ ! -f "$TEMPDIR/install/slack-required" ]; then
    echo "WARNING: slack-required was not found inside $1"
  else
    REQUIRED="$(cat "$TEMPDIR/install/slack-required" | xargs -r -iZ echo -n "Z," | sed -e "s/,$//")"
  fi

  if [ -f "$TEMPDIR/install/slack-conflicts" ]; then
    CONFLICTS="$(cat "$TEMPDIR/install/slack-conflicts" | xargs -r -iZ echo -n "Z," | sed -e "s/,$//")"
  fi

  if [ -f "$TEMPDIR/install/slack-conflicts" ]; then
    SUGGESTS=$(cat "$TEMPDIR/install/slack-suggests" | xargs -r)
  fi
 
  METAFILE=${NAME%$PKGEXT}meta
  echo "PACKAGE NAME:  $NAME" > $LOCATION/$METAFILE
  if [ -n "$DL_URL" ]; then
 	 echo "PACKAGE MIRROR:  $DL_URL" >> $LOCATION/$METAFILE
  fi
  echo "PACKAGE LOCATION:  $LOCATION" >> $LOCATION/$METAFILE
  echo "PACKAGE SIZE (compressed):  $SIZE K" >> $LOCATION/$METAFILE
  echo "PACKAGE SIZE (uncompressed):  $USIZE K" >> $LOCATION/$METAFILE
  echo "PACKAGE REQUIRED:  $REQUIRED" >> $LOCATION/$METAFILE
  echo "PACKAGE CONFLICTS:  $CONFLICTS" >> $LOCATION/$METAFILE
  echo "PACKAGE SUGGESTS:  $SUGGESTS" >> $LOCATION/$METAFILE

  echo "PACKAGE DESCRIPTION:" >> $LOCATION/$METAFILE
  if [ ! -f "$TEMPDIR/install/slack-desc" ]; then
    echo "WARNING: slack-desc was not found inside $1. "
  else
    cat "$TEMPDIR/install/slack-desc" | grep -E '\w+\:'| grep -v '^#' >> $LOCATION/$METAFILE
  fi
  echo "" >> $LOCATION/$METAFILE
  echo "Done!"
  rm -rf $TEMPDIR
}

case "$1" in
 pkg)
  if [ -n "$2" ]; then
    gen_meta $2
  else
    echo "$0 [pkg [file]|all|new|PACKAGESTXT|MD5]"
  fi
 ;;
 all)
  for pkg in `find . -type f -regex '.*\.[tgblzikx]+$' -print`
  do
    gen_meta $pkg
  done
  $0 PACKAGESTXT
  $0 MD5
 ;;
 new)
  for pkg in `find . -type f -regex '.*\.[tgblzikx]+$' -print`
  do
   if [ ! -f ${pkg%${pkg##*.}}meta ]; then
     gen_meta $pkg
   fi
  done
 ;;
 PACKAGESTXT)
  gen_packages_txt
 ;;
 MD5)
  gen_md5_checksums
 ;;
 *)
  echo "$0 [pkg [file]|all|new|PACKAGESTXT|MD5]"
 ;;
esac