#!/bin/bash
#
# createpkg: package builder using http://slack.sarava.org/slackbuilds scripts
# feedback: rhatto at riseup.net | gpl
#
#  createpkg 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.
#
#  createpkg 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
#
# /etc/simplepkg/slackbuildrc parameters:
#
# SLACKBUILDS="/folder/to/place/slackbuilds", defaults to /var/slackbuilds
# SVN="svn://repository", defaults do svn://slack.sarava.org/slackbuilds
# SYNC="yes|no", whether to always update the repository
#
# TODO
#
# - optionally show a dependency tree before create the package
# - think if its better to change function check_config to directly source
#   both /root/.slackbuildrc and /etc/slackbuildrc
# - option --list to list all available slackbuilds
# - option --search allowing use of wildcards or just part of the package name
# - in function solve_dep: resolve program versions
#

COMMON="/usr/libexec/simplepkg/common.sh"
SLACKBUILDRC="/etc/slackbuildrc"

# first load simplepkg helper functions
if [ -f "$COMMON" ]; then
  source $COMMON
else
  echo "error: file $COMMON found, check your $BASENAME installation"
  exit 1
fi

function handle_error {

  # this function deals with internal createpkg errors
  # and also with non-zero exit codes from slackbuilds

  # check slackbuild exit status are:
  #
  # ERROR_WGET=31;      ERROR_MAKE=32;      ERROR_INSTALL=33
  # ERROR_MD5=34;       ERROR_CONF=35;      ERROR_HELP=36
  # ERROR_TAR=37;       ERROR_MKPKG=38      ERROR_GPG=39
  # ERROR_PATCH=40;     ERROR_VCS=41
  #
  # thanks to rudsonalves at yahoo.com.br for this spec.

  # we don't want to process when exit status = 0
  if [ "$1" == "0" ]; then
    return
  fi

  # exit codes
  case $1 in
    2) usage ;;
    3) echo $BASENAME: could not update the repository $2 ;;
    4) echo $BASENAME: could not create folder $2 ;;
    5) echo $BASENAME: script not found for $2 ;;
   31) echo $BASENAME: error downloading source for $2 ;;
   32) echo $BASENAME: error compiling $2 source code ;;
   33) echo $BASENAME: error installing $2 ;;
   34) echo $BASENAME: error on source code integrity check for $2 ;;
   35) echo $BASENAME: error configuring the source code for $2 ;;
   36) exit 0 ;; # its supposed to never happen here :P
   37) echo $BASENAME: error decompressing source code for $2 ;;
   38) echo $BASENAME: error creating package $2 ;;
   39) echo $BASENAME: error verifying GPG signature the source code for $2 ;;
   40) echo $BASENAME: error patching the source code for $2 ;;
   41) echo $BASENAME: error downloading $2 source from version control system ;; 
    *) echo $BASENAME: unknown error or user interrupt
  esac

  exit $1

}

function build_repo {

  # checkout a new slackbuild working copy 

  BASEDIR="`dirname $SLACKBUILDS`"
  mkdir -p $BASEDIR || handle_error 4 $BASEDIR
  cd $BASEDIR
  svn checkout $SVN
  cd $SLACKBUILDS

}

function usage {

  echo "usage: createpkg [--install] package-name"
  echo "       createpkg --no-deps package-name"
  echo "       createpkg --search package-name"
  echo "       createpkg --sync"

}

function check_config {

  # check the configuration

  # TODO: eval also ~/.slackbuildrc
  if [ -f "$SLACKBUILDRC" ]; then
    source $SLACKBUILDRC
  fi

  TMP=${TMP:=/tmp}
  REPOS=${REPOS:=$TMP}
  SLACKBUILDS=${SLACKBUILDS:=/var/slackbuilds}
  SVN=${SVN:=svn://slack.sarava.org/slackbuilds}
  SYNC=${SYNC:=no}
  BASEDIR="`dirname $SLACKBUILDS`"

}

function solve_dep {

  pack="$1"
  cond="$2"
  ver="$3"

  if [ "$cond" != "equal" ] && [ "$cond" != "less" ] && [ "$cond" != "equalorgreater" ] && [ "$cond" != "lessequal" ] && [ ! -z "$cond" ]; then
    # slack-required has a wrong logical sentence, so we ignore it
    check_version="no"
  fi

  for candidate in `ls /var/log/packages/$pack* 2> /dev/null`; do
    candidate="`package_name $candidate`"
    if [ "$pack" == "$candidate" ]; then
      if [ "$check_version" != "no" ]; then
        # TODO: check if the pack has the correct version
        true
      fi
      found="1"
      break
    fi
  done

  if [ "$found" != "1" ]; then
    echo $BASENAME: processing $PACKAGE dependency $pack
    SYNC=no CREATEPKG_CHILD=$CREATEPKG_CHILD createpkg --install $pack
    # check if the package was built and installed
    exit_code="$?"
    if [ "$exit_code" != "0" ]; then
      echo $BASENAME: received an error when processing $pack, aborting
      exit $exit_code
    fi
  else
    found="0"
  fi

}

function check_repo {

  if [ ! -d "$SLACKBUILDS" ]; then
    build_repo
  fi

}

function sync_repo {

  cd $SLACKBUILDS
  svn update || build_repo

}

function find_script {

  find $SLACKBUILDS | grep -v .svn | grep -e "/$1.SlackBuild$"

}

# this is used to show how many children process we have
if [ -z "$CREATEPKG_CHILD" ]; then
  CREATEPKG_CHILD="1"
else
  CREATEPKG_CHILD="`echo $CREATEPKG_CHILD + 1 | bc -l`"
fi

BASENAME="`basename $0`[$CREATEPKG_CHILD]"

check_config
check_repo

if [ -z "$1" ]; then
  handle_error 2
elif [ "$#" == "2" ]; then
  if [ "$1" == "--search" ]; then
    find_script $2
    exit
  elif [ "$1" == "--install" ]; then
    PACKAGE="$2"
    INSTALL="1"
  elif [ "$1" == "--no-deps" ]; then
    NO_DEPS="1"
    PACKAGE="$2"
  else
    handle_error 2
  fi
elif [ "$1" == "--sync" ]; then
  sync_repo 
  exit
elif [ "${1:0:1}" != "-" ]; then
  PACKAGE="$1"
else
  handle_error 2
fi

if [ "$SYNC" == "yes" ]; then
  sync_repo
fi

BUILD_SCRIPT="`find_script $PACKAGE`"

if [ -z "$BUILD_SCRIPT" ]; then
  handle_error 5 $PACKAGE
fi

SCRIPT_BASE="`dirname $BUILD_SCRIPT`"
echo $BASENAME: found script $PACKAGE.SlackBuild, now checking for dependencies

# sets the package's slack-required
if [ -f "$SCRIPT_BASE/$PACKAGE.slack-required" ]; then
  SLACK_REQ="$SCRIPT_BASE/$PACKAGE.slack-required"
elif [ -f "$SCRIPT_BASE/slack-required" ]; then
  SLACK_REQ="$SCRIPT_BASE/slack-required"
fi

if [ ! -z "$SLACK_REQ" ] && [ "$NO_DEPS" != "1" ]; then
  # this routine checks for dependencies in package's slack-required
  while read dep; do
    if [ ! -z "$dep" ]; then
      program="`echo $dep | awk '{ print $1 }'`"
      condition="`echo $dep | awk '{ print $2 }' | sed -e 's/>=/equalorgreater/' -e 's/=</equalorless/' -e 's/</less/' -e 's/>/greater/' -e 's/=/equal/'`"
      version="`echo $dep | awk '{ print $3 }' | tr -dc '[:digit:]'`"
      solve_dep $program $condition $version
    fi
  done < <( cat $SLACK_REQ )
  echo $BASNEMAE: done checking for $PACKAGE dependencies
else
  echo $BASENAME: no unmet dependencies for $PACKAGE
fi

echo $BASENAME: processing `basename $BUILD_SCRIPT`

# built package
cd $SCRIPT_BASE
INTERACT=no ./`basename $BUILD_SCRIPT`

# check if package was built
handle_error $? $PACKAGE

if [ "$INSTALL" == "1" ]; then
  # as we dont have the full package file name, we'll
  # use the newer file name that matches our wildcard:
  PACKAGE="`ls -1 -c $REPOS/$PACKAGE-*-*-*tgz | head -n 1`"
  upgradepkg --install-new $PACKAGE
fi