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#!/bin/bash
#
#   repo-remove : remove a package entry from a given repo database file
#  
#   Copyright (c) 2007 Dan McGee <dan@archlinux.org>
#  
#   This program 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
#   (at your option) any later version.
# 
#   This program 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.

myver='@PACKAGE_VERSION@'

FORCE=0
REPO_DB_FILE=""
TMP_DIR=""

# print usage instructions
usage() {
  echo "repo-remove $myver"
  echo
  echo "usage: repo-remove <path-to-db> <packagename> ..."
  echo
  echo "repo-remove will update a package database by removing the package name"
  echo "specified on the command line from the given repo database. Multiple"
  echo "packages to remove can be specified on the command line."
  echo
  echo "Example:"
  echo "  repo-remove /path/to/repo.db.tar.gz kernel26"
  echo
}

version() {
  printf "repo-remove (pacman) %s\n" "$myver"
  printf "Copyright (C) 2007 Dan McGee <dan@archlinux.org>.\n"
  echo
  printf "This is free software; see the source for copying conditions.\n"
  printf "There is NO WARRANTY, to the extent permitted by law.\n"
  echo
}

# test if a file is a repository DB
test_repo_db_file () {
  if [ -f "$REPO_DB_FILE" ]; then
    [ "$(tar tf "$REPO_DB_FILE" | grep -c "/desc")" -gt 0 ] || return 1
  else
    true
  fi
}

# remove existing entries from the DB
db_remove_entry()
{
  cd $gstmpdir

  # remove any other package in the DB with same name
  for existing in *; do
    if [ "${existing%-*-*}" = "$1" ]; then
      echo ":: removing existing package '$existing'"
      rm -rf $existing
    fi
  done
} # end db_remove_entry

# PROGRAM START

# check for help flags
if [ "$1" = "-h" -o "$1" = "--help" ]; then
  usage
  exit 0
fi

# check for version flags
if [ "$1" = "-V" -o "$1" = "--version" ]; then
  version
  exit 0
fi

# check for correct number of args
if [ $# -lt 2 ]; then
  usage
  exit 1
fi

# source system and user makepkg.conf
if [ -r /etc/makepkg.conf ]; then
  source /etc/makepkg.conf
else
  echo "ERROR: /etc/makepkg.conf not found. Can not continue." >&2
  exit 1 # $E_CONFIG_ERROR # TODO: error codes
fi

if [ -r ~/.makepkg.conf ]; then
  source ~/.makepkg.conf
fi

# main routine
if [ $# -gt 1 ]; then
  gstmpdir=$(mktemp -d /tmp/gensync.XXXXXXXXXX) || (\
  echo "cannot create temp directory for database building"; \
  exit 1)

  success=0
  # parse arguements
  for arg in $@; do
    if [ -z "$REPO_DB_FILE" ]; then
      REPO_DB_FILE="$(readlink -f $arg)"
      if ! test_repo_db_file; then
        echo "error: repository file '$REPO_DB_FILE' is not a proper pacman db"
        exit 1
      elif [ -f "$REPO_DB_FILE" ]; then
        echo ":: extracting database to a temporary location"
        tar xf "$REPO_DB_FILE" -C "$gstmpdir"
      fi
    else
      echo ":: searching for package '$arg'"

      this_dir="$(pwd)"
      if db_remove_entry "$arg"; then
        success=1
      else
      echo "error: package matching '$arg' not found"
      fi
      cd $this_dir
    fi
  done

  # if all operations were a success, rezip database
  if [ "$success" = "1" ]; then
    echo ":: creating updated database file ${REPO_DB_FILE}"
    cd $gstmpdir
    if [ -n "$(ls)" ]; then
      [ -f "${REPO_DB_FILE}.old" ] && rm "${REPO_DB_FILE}.old"
      [ -f "$REPO_DB_FILE" ] && mv "$REPO_DB_FILE" "${REPO_DB_FILE}.old"
      case "$DB_COMPRESSION" in
        gz) tar c * | gzip -9 >$REPO_DB_FILE ;;
        bz2) tar c * | bzip2 -9 >$REPO_DB_FILE ;;
        *) echo "warning: no compression set"
        tar c * >$REPO_DB_FILE;;
      esac
    fi
  else
    echo ":: no packages modified, nothing to do"
  fi
fi

# remove the temp directory used to unzip
[ -d "$gstmpdir" ] && rm -rf $gstmpdir

# vim: set ts=2 sw=2 noet: