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#!/bin/bash
#
# templatepkg v0.2: create a simplepkg package list from
#                   a legacy slackware /var/log/packages
#
# feedback: rhatto at riseup.net | gpl
# 
#  Templatepkg is free software; you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation; either version 2 of the License, or any later version.
#
#  Templatepkg is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
#  A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along with
#  this program; if not, write to the Free Software Foundation, Inc., 59 Temple
#  Place - Suite 330, Boston, MA 02111-1307, USA
#

COMMON="/usr/libexec/simplepkg/common.sh"
BASENAME="`basename $0`"

if [ -f "$COMMON" ]; then
  source $COMMON
  eval_config `basename $0`
else
  echo "error: file $COMMON found, check your `basename $0` installation"
  exit 1
fi

APPEND="0"
if [[ ! -z "$3" && "$1" == "-a" ]]; then
  ROOT="$3"
  search_template $2 --new
  APPEND="1"
elif [[ ! -z "$2" && "$1" == "-a" ]]; then
  ROOT="/"
  search_template $2 --new
  APPEND="1"
elif [[ ! -z "$2" ]]; then
  ROOT="$2"
  search_template $1 --new
elif [[ ! -z "$1" ]]; then
  search_template $1 --new
  ROOT="/"
else
  echo "usage: $BASENAME [-a] <template> [root-dir]"
  echo -e "\t-a: append packages into a template"
  exit 1
fi

TEMPLATE="$BASE_TEMPLATE.template"

if [ ! -d "$ROOT/var/log/packages" ]; then
  echo $ROOT/var/log/packages: directory not found
  exit 1
elif [[ -f "$TEMPLATE" && "$APPEND" == "0" ]]; then
  rm -f $TEMPLATE
fi

for package in `ls -1 $ROOT/var/log/packages/`; do
  pack=`package_name $package`
  if [ -f $TEMPLATE ]; then
    if ! `grep -v -e "^#" $TEMPLATE | cut -d : -f 1 | grep -q -e "^$pack\$"`; then
      package_name $package >> $TEMPLATE
    fi
  else
    package_name $package >> $TEMPLATE
  fi
done

# checks if each package from the template is installed
grep -v -e "^#" $TEMPLATE | cut -d : -f 1 | while read pack; do

  if [ ! -z "$pack" ]; then
    unset found
    for candidate in `ls $ROOT/var/log/packages/$pack* 2> /dev/null`; do
      candidate="`package_name $candidate`"
      if [ "$pack" == "$candidate" ]; then
        found="1"
        break
      fi
    done
    if [ "$found" != "1" ]; then
      # removes a non-installed package from the template
      sed "/^$pack$/d" $TEMPLATE | sed "/^$pack $/d" | sed "/^$pack:*/d" > $TEMPLATE.tmp
      cat $TEMPLATE.tmp > $TEMPLATE
      rm -f $TEMPLATE.tmp
    fi
  fi

done