#!/bin/bash
# Version: 1.6 GSB Section SlackBuild.
# Copyright (c) 2007 Darren 'Tadgy' Austin <darren (at) gnomeslackbuild.org>
#
# Licenced under the terms of the GNU General Public Licence version 3.
#

# Make sure we are in the right directory (you can never trust users..)
cd $( cd ${BASH_SOURCE%/*} ; pwd )

# Section name.
# This should not need to be changed unless the auto detection fails.
SECTION="$( basename $( pwd ) )"

# Packages to build.
# Package list is read in from .buildlist in the current directory, with any
# comments and blank lines removed.
PACKAGES="$( egrep -v "^#|^$" .buildlist | cut -d'#' -f1 )"

# Usage.
function usage() {
  cat << EOF
Usage: ${0##*/} [options]

Options:
  --help		Show this help screen.

  --list		List the packages which will be built in this section.

  --force		A package will not be built if a package of the same
			name is already installed, or any of the pre-requisite
			packages are not installed.  This option over-rides
			the checks and attempts a build (which will probably
			fail) anyway.

  --no-cleanup		By default, any source, temporary build and package
			directories will be deleted once the package is built.
			This option prevents those files from being removed.

  --no-patchesdir	When rebuilding packages which already exist in the
			main package directory, the default is to put the new
			packages in the patches directory.  Using this option
			completely disables the use of a patches directory.

  --no-skip		During the build process, packages that are up to date
			(ie, the package version and build numbers match the
			coresponding SlackBuild) will not be rebuilt.  This
			option forces packages to be rebuilt regardless of the
			version and build numbers.  This option doesn't affect
			the pre-build checks for installed packages (see the
			--force option).  This option implies --no-patchesdir.

  --no-prune		Normally, when a package is built and copied to the
			destination directory (whether it be the main package 
			directory or the patches directory), any previous
			package(s) of the same name in that directory are
			deleted - it is assumed the new package is to replace
			any which are already present.  This option prevents
			previous packages being deleted, possibly leaving more
			than one package of the same name (but with different
			version or build numbers) laying around.

  --no-install		Build the packages but don't install them afterwards.
			This should only be used for testing as it WILL cause
			serious problems - most builds rely on other GSB
			packages being automatically installed first.

  --no-metafiles	Do not create the package's .txt and .md5 meta files
			which would usually be produced during a build.

  Options are passed down to the next level SlackBuild where appropriate.
EOF
}

function list_packages() {
  local PACKAGE
  echo "The following packages are built in this section, listed in processing order:"
  ( for PACKAGE in $PACKAGES
    do
      echo -n "$PACKAGE, "
    done ) | sed -e 's/, $//' | fmt -w 74 | sed -e 's/^/    /g'
}

function find_package_files() {
  # $1 = Directory to look for files in [required]
  # $2 = Package name or regex to match.  An empty string matches all.
  # $3 = Package version or regex to match.  An empty string matches all.
  # $4 = Package architecture or regex to match.  An empty string matches all.
  # $5 = Package build tag or regex to match.  An empty string matches all.
  # $6 = File extension or regex to match.  An empty string means no extension.
  # Note: Remember to escape any regex characters used in fixed strings.

  [ -z "$1" ] || [ ! -d "$1" ] && return 1
  find $1 -maxdepth 1 -mindepth 1 2>/dev/null | \
    egrep "^.*/(${2:-.*})(-${3:-[^-]*})(-${4:-[^-]*})(-${5:-[^-.]*})($6)$" 2>/dev/null
  return $?
}

function runtime() {
  # $1 = Number of seconds to convert to readable text [required]

  [ -z "$1" ] && return 1

  local D=$(( $1 / 86400 ))
  local H=$(( ($1 - ($D * 86400)) / 3600 ))
  local M=$(( ($1 - ($D * 86400) - ($H * 3600)) / 60 ))
  local S=$(( $1 - ($D * 86400) - ($H * 3600) - ($M * 60) ))

  if [ $D -gt 0 ]; then
    echo -n "${D}d, ${H}h ${M}m ${S}s"
  else
    echo -n "${H}h, ${M}m ${S}s"
  fi
  return 0
}

function gen_pkg_txt() {
  # $1 = Package file to process [required].

  [ -z "$1" ] || [ ! -e "$1" ] && return 1
  tar xzOf $1 install/slack-desc 2>/dev/null | \
    grep -v "^#" | egrep "[[:alnum:]\+]+\:" >${1%.tgz}.txt
  return $?
}

function gen_pkg_md5() {
  # $1 = Package file to process [required].

  [ -z "$1" ] || [ ! -e "$1" ] && return 1
  ( cd $( dirname $1 ) && md5sum $( basename $1 ) >$1.md5 )
  return $?
}

# If the user created an options file, read it.
[ "$OPTIONSREAD" != "1" -a -r ../gsb.options ] && {
  . ../gsb.options
  export OPTIONSREAD=1
}

# Environment.
export TMP=${TMP:-/tmp}
if [ "$ARCH" = "x86_64" ]; then
  export PKGDEST=${PKGDEST:-$TMP/gsb64-tree}
  export LOGSDIR=${LOGSDIR:-$TMP/gsb64-buildlogs}
else
  export PKGDEST=${PKGDEST:-$TMP/gsb-tree}
  export LOGSDIR=${LOGSDIR:-$TMP/gsb-buildlogs}
fi
export GSBDIR=${GSBDIR:-gsb}
export PATCHESDIR=${PATCHESDIR:-patches}
export TESTINGDIR=${TESTINGDIR:-testing}
export PACKAGESDIR=${PACKAGESDIR:-packages}
export SOURCEDIR=${SOURCEDIR:-source}

# Option defaults.
NOPATCHESDIR=0
NOSKIP=0
NOPRUNE=0
NOINSTALL=0
NOMETAFILES=0

# Sanity check (in case Steve forgets to add packages again :P).
[ $( echo "$PACKAGES" | wc -w ) != \
  $( find . -type d ! -name .svn -maxdepth 1 -mindepth 1 | wc -w ) ] && {
  echo
  echo "*********************************************************************"
  echo "** Error: the number of packages in the PACKAGES list is different"
  echo "**        to the number of package directories in this section."
  echo "**        Some packages may not have been added to the PACKAGES list."
  echo "*********************************************************************"
  exit 1
}

# Parse command line arguments.
while [ $# -gt 0 ]; do
  if [ "$1" = "-help" ] || [ "$1" = "--help" ]; then
    usage
    exit 0
  elif [ "$1" = "-list" ] || [ "$1" = "--list" ]; then
    list_packages
    exit 0
  elif [ "$1" = "-force" ] || [ "$1" = "--force" ]; then
    SLACKBUILD_ARGS="${SLACKBUILD_ARGS:+"$SLACKBUILD_ARGS "}--force"
    shift
  elif [ "$1" = "-no-cleanup" ] || [ "$1" = "--no-cleanup" ]; then
    SLACKBUILD_ARGS="${SLACKBUILD_ARGS:+"$SLACKBUILD_ARGS "}--no-cleanup"
    shift
  elif [ "$1" = "-no-patchesdir" ] || [ "$1" = "--no-patchesdir" ]; then
    NOPATCHESDIR=1
    shift
  elif [ "$1" = "-no-skip" ] || [ "$1" = "--no-skip" ]; then
    NOSKIP=1
    NOPATCHESDIR=1
    shift
  elif [ "$1" = "-no-prune" ] || [ "$1" = "--no-prune" ]; then
    NOPRUNE=1
    shift
  elif [ "$1" = "-no-install" ] || [ "$1" = "--no-install" ]; then
    NOINSTALL=1
    shift
  elif [ "$1" = "-no-metafiles" ] || [ "$1" = "--no-metafiles" ]; then
    NOMETAFILES=1
    shift
  else
    echo "${0##*/}: Unknown option: $1"
    echo "Try: $0 --help"
    exit 1
  fi
done

# Temporary space, package and log file storage.
mkdir -p $TMP
mkdir -p $PKGDEST
mkdir -p $LOGSDIR
mkdir -p $LOGSDIR/$SECTION

echo
echo "*********************************************************************"
echo "** Building section '$SECTION'..."
echo "*********************************************************************"

# Process packages.
( for PACKAGE in $PACKAGES
  do
    # Build defaults.
    SKIP_BUILD=0
    SUBDIR=$GSBDIR/$PACKAGESDIR/$SECTION

    echo
    echo "*********************************************************************"
    echo "*** Processing package '$PACKAGE'..."
    echo "*********************************************************************"

    # Sanity checks.
    [ ! -e "$PACKAGE/$PACKAGE.SlackBuild" ] && {
      echo
      echo "*********************************************************************"
      echo "*** Error: '$PACKAGE.SlackBuild' not found."
      echo "*********************************************************************"
      exit 1
    }
    [ ! -x "$PACKAGE/$PACKAGE.SlackBuild" ] && {
      echo
      echo "*********************************************************************"
      echo "*** Error: '$PACKAGE.SlackBuild' is not executable."
      echo "*********************************************************************"
      exit 1
    }

    # Get package version and build numbers from the package SlackBuild.
    declare PACKAGE_$( egrep -m 1 "^VERSION=.*" $PACKAGE/$PACKAGE.SlackBuild )
    declare PACKAGE_$( egrep -m 1 "^BUILD=.*" $PACKAGE/$PACKAGE.SlackBuild )

    # Check that we got a version and build.
    [ -z "$PACKAGE_VERSION" ] || [ -z "$PACKAGE_BUILD" ] && {
      echo
      echo "*********************************************************************"
      echo "*** Error: failed to get VERSION or BUILD from '$PACKAGE.SlackBuild'"
      echo "*********************************************************************"
      exit 1
    }

    # Check if the package should be rebuilt, and where it should be put.
    # The assumption is to always rebuild and put packages in the main
    # directory, unless modified by the checks below.
    if find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
      "" "" "" "\.tgz" >/dev/null && [ "$NOSKIP" = "0" ]
    then
      if find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
        "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" "\.tgz" >/dev/null
      then
        # Package with same version/build was found in the main directory.
        SKIP_BUILD=1
      else
        # Not in the main directory, check patches.
        if [ "$NOPATCHESDIR" = "0" ]; then
          if find_package_files "$PKGDEST/$PATCHESDIR/$PACKAGESDIR/$SECTION" \
            "${PACKAGE//+/\+}" "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" \
            "\.tgz" >/dev/null
          then
            # Found in patches dir.
            SKIP_BUILD=1
            SUBDIR=$PATCHESDIR/$PACKAGESDIR/$SECTION
          else
            # No package in patches with the same version/build.
            SUBDIR=$PATCHESDIR/$PACKAGESDIR/$SECTION
          fi
        fi
      fi
    fi

    # Build package if required.
    if [ "$SKIP_BUILD" = "0" ]; then
      echo
      echo "*********************************************************************"
      echo "*** Removing installed package (if required) and cleaning up files"
      echo "*********************************************************************"
      rm -f $( find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
        "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" "\.tgz|\.txt|\.tgz\.md5" \
        | tr '\n' ' ' ) >/dev/null 2>&1
      find_package_files "/var/log/packages" "${PACKAGE//+/\+}" "" "" "" "" \
        >/dev/null && {
        removepkg $( basename $( find_package_files "/var/log/packages" \
          "${PACKAGE//+/\+}" "" "" "" "" ) )
      }

      echo
      echo "*********************************************************************"
      echo "*** Building package '$PACKAGE'..."
      echo "*********************************************************************"
      mkdir -p $PKGDEST/$SUBDIR
      ( cd $PACKAGE && export PKGDEST=$PKGDEST/$SUBDIR &&
        ./$PACKAGE.SlackBuild $SLACKBUILD_ARGS 2>&1 ) | \
        tee $LOGSDIR/$SECTION/$PACKAGE-$( date +%Y%m%d-%H%M%S ).log
      ERR=${PIPESTATUS[0]}
      [ "$ERR" != "0" ] && {
        echo
        echo "*********************************************************************"
        echo "*** Error: '$PACKAGE' build failed."
        echo "*********************************************************************"
        exit $ERR
      }
    else
      echo
      echo "*********************************************************************"
      echo "*** Skipping build of '$PACKAGE' - package up to date."
      echo "*********************************************************************"
    fi

    PRUNE_FILES="$( find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
      "" "" "" "\.tgz|\.txt|\.tgz\.md5" | grep -v "$( find_package_files \
      "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" "${PACKAGE_VERSION//-/_}" "" \
      "$PACKAGE_BUILD" "\.tgz" )" | tr '\n' ' ' )"
    [ ! -z "$PRUNE_FILES" ] && {
      if [ "$NOPRUNE" = "0" ]; then
        echo
        echo "*********************************************************************"
        echo "*** Pruning old '$PACKAGE' package files from tree..."
        echo "*********************************************************************"
        rm -f $PRUNE_FILES
      else
        echo
        echo "*********************************************************************"
        echo "*** Warning: not pruning any old '$PACKAGE' files."
        echo "*********************************************************************"
      fi
    }

    if [ "$NOMETAFILES" = "0" ]; then
      echo
      echo "*********************************************************************"
      echo "*** Creating meta files for '$PACKAGE'..."
      echo "*********************************************************************"
      gen_pkg_txt "$( find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
        "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" "\.tgz" )" &&
      gen_pkg_md5 "$( find_package_files "$PKGDEST/$SUBDIR" "${PACKAGE//+/\+}" \
        "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" "\.tgz" )" || {
        echo
        echo "*********************************************************************"
        echo "*** Error: failed to create meta files for '$PACKAGE'."
        echo "*********************************************************************"
        exit 1
      }
    else
      echo
      echo "*********************************************************************"
      echo "*** Warning: not creating meta files for '$PACKAGE'."
      echo "*********************************************************************"
    fi

    if [ "$NOINSTALL" = "0" ]; then
      echo
      echo "*********************************************************************"
      echo "*** Installing '$PACKAGE'..."
      echo "*********************************************************************"
      upgradepkg --install-new $( find_package_files "$PKGDEST/$SUBDIR" \
        "${PACKAGE//+/\+}" "${PACKAGE_VERSION//-/_}" "" "$PACKAGE_BUILD" "\.tgz" ) || {
        echo
        echo "*********************************************************************"
        echo "*** Error: failed to install '$PACKAGE'."
        echo "*********************************************************************"
        exit 1
      }
    else
      echo
      echo "*********************************************************************"
      echo "*** Warning: not installing '$PACKAGE'."
      echo "*********************************************************************"
    fi
  done

  echo
  echo "*********************************************************************"
  echo "** Finished building section '$SECTION'."
  echo "*********************************************************************"
  echo "** Binary packages can be found in sub directories of:"
  echo "**    $PKGDEST"
  echo "** Individual build logs can be found in:"
  echo "**    $LOGSDIR/$SECTION"
  echo "** Package files and build logs can be deleted if not required."
  echo "*********************************************************************"
  echo "** Section build time was $( runtime $SECONDS )."
  echo "*********************************************************************"
) 2>&1 | tee $LOGSDIR/$SECTION-$(date +%Y%m%d-%H%M%S).log

# Return the exit status from the sub-shell, not the tee command.
exit ${PIPESTATUS[0]}