#!/bin/bash
#
# common.sh: common functions for simplepkg
# feedback: rhatto at riseup.net | gpl
#
# Uses some functions from pkgtools, which license is:
#
# Copyright 1999  Patrick Volkerding, Moorhead, Minnesota, USA 
# Copyright 2001, 2002, 2003  Slackware Linux, Inc., Concord, California, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

BASE_CONF="/etc/simplepkg"
CONF="$BASE_CONF/simplepkg.conf"
JAIL_LIST="$BASE_CONF/jailist"
SIMPLARET="simplaret"

# pkgtool stuff
function package_name {

  STRING=`basename $1 .tgz`
  # Check for old style package name with one segment:
  if [ "`echo $STRING | cut -f 1 -d -`" = "`echo $STRING | cut -f 2 -d -`" ]; then
    echo $STRING
  else # has more than one dash delimited segment
    # Count number of segments:
    INDEX=1
    while [ ! "`echo $STRING | cut -f $INDEX -d -`" = "" ]; do
      INDEX=`expr $INDEX + 1`
    done
    INDEX=`expr $INDEX - 1` # don't include the null value
    # If we don't have four segments, return the old-style (or out of spec) package name:
    if [ "$INDEX" = "2" -o "$INDEX" = "3" ]; then
      echo $STRING
    else # we have four or more segments, so we'll consider this a new-style name:
      NAME=`expr $INDEX - 3`
      NAME="`echo $STRING | cut -f 1-$NAME -d -`"
      echo $NAME
    fi
  fi

}

function package_version {

  # get VERSION from a package name
  local file pack version
  file="`basename $1`"
  pack="`package_name $1`"
  version="`echo $file | sed -e "s/^$pack-//" | cut -d "-" -f 1`"
  echo $version

}

function package_arch {

  # get ARCH from a package name
  local file pack arch
  file="`basename $1`"
  pack="`package_name $1`"
  arch="`echo $file | sed -e "s/^$pack-//" | cut -d "-" -f 2`"
  echo $arch

}

function package_build {

  # get BUILD from a package name
  local file pack build
  file="`basename $1 .tgz`"
  pack="`package_name $1`"
  build="`echo $file | sed -e "s/^$pack-//" | cut -d "-" -f 3`"
  echo $build

}

function install_packages {

  local check installed unable_to_install root

  # check if is time to clean the local repository
  if [ "$SIMPLARET_CLEAN"  == "1" ]; then
    ARCH=$ARCH VERSION=$VERSION $SIMPLARET --purge
  elif [ ! -z "$SIMPLARET_PURGE_WEEKS" ] && [ "$SIMPLARET_PURGE_WEEKS" != "0" ]; then
    ARCH=$ARCH VERSION=$VERSION $SIMPLARET --purge -w $SIMPLARET_PURGE_WEEKS
  fi

  root="$JAIL_ROOT/$server"

  # now tries to install each package listed in the template
  for pack in `cat $TEMPLATE | grep -v -e "^#" | cut -d : -f 1 | awk '{ print $1 }'`; do

    # try to install the package
    ROOT=/$root ARCH=$ARCH VERSION=$VERSION $SIMPLARET --install $pack --skip-checks

    # check if the package was installed
    installed=`eval "ls /$root/var/log/packages/ | egrep '^$pack-[^-]+-[^-]+-[^-]+$'"`
    check=$?

    if [ ! -z "$installed" ] && [ "$check" == "0" ]; then
      # the package is installed
      if [ ! -z "$SIMPLARET_DELETE_DURING" ] && [ "$SIMPLARET_DELETE_DURING" != "0" ]; then
        SILENT=1 ARCH=$ARCH VERSION=$VERSION $SIMPLARET --purge
      fi
    else
      unable_to_install="$unable_to_install\n\t$pack"
    fi

  done

  # purge packages, if needed
  if [ "$SIMPLARET_DELETE_DOWN" == "1" ]; then
    ARCH=$ARCH VERSION=$VERSION $SIMPLARET --purge
  fi

  if [ ! -z "$unable_to_install" ]; then
    echo "mkjail was unable to install the following packages on $root:"
    echo -e "$unable_to_install"
  fi

}

function remove_packages {

  for pack in `cat $TEMPLATE | grep -v -e "^#" | cut -d : -f 1`; do
    ROOT=/$JAIL_ROOT/$server removepkg $pack
  done

}

function eval_parameter {

  # usage: eval $1 parameter from $CONF
  # return the evaluated parameter if available or $2 $3 ... $n

  if grep -qe "^$1=" $CONF; then
    grep -e "^$1=" $CONF | cut -d = -f 2 | sed -e 's/"//g' -e "s/'//g" | sed -e 's/ *#.*$//'
  else
    shift
    echo $*
  fi

}

function eval_boolean_parameter {

  # get a boolean parameter from the configuration

  local value

  # get the value
  value="`eval_parameter $1 $2`"

  # force case insensitiveness
  value="`echo $value | tr '[:upper:]' '[:lower:]'`"

  # convert it to wheter 0 or 1
  if [ "$value" == "yes" ] || [ "$value" == "1" ]; then
    echo 1
  else
    echo 0
  fi

}

function eval_config {

  # simplepkg config file evaluation
  # usage: eval_config <program-name> [-u]

  if [ -f "$CONF" ]; then

    DEFAULT_ARCH="`eval_parameter DEFAULT_ARCH $(default_arch)`"
    DEFAULT_VERSION="`eval_parameter DEFAULT_VERSION $(default_version)`"

    STORAGE="`eval_parameter STORAGE /var/simplaret/packages`"
    JAIL_ROOT="`eval_parameter JAIL_ROOT /vservers`"
    PATCHES_DIR="`eval_parameter PATCHES_DIR /var/simplaret/patches`"
    ROOT_PRIORITY="`eval_parameter ROOT_PRIORITY patches slackware extra testing pasture`"
    SIMPLARET_PURGE_WEEKS="`eval_parameter SIMPLARET_PURGE_WEEKS 0`"
    FTP_TOOL="`eval_parameter FTP_TOOL curl`"
    HTTP_TOOL="`eval_parameter HTTP_TOOL curl`"
    CONNECT_TIMEOUT="`eval_parameter CONNECT_TIMEOUT 0`"
    TEMPLATE_FOLDER="`eval_parameter TEMPLATE_BASE /etc/simplepkg/templates`"
    TEMPLATE_STORAGE_STYLE="`eval_parameter TEMPLATE_STORAGE_STYLE own-folder`"

    SIMPLARET_CLEAN="`eval_boolean_parameter SIMPLARET_CLEAN 1`"
    SIMPLARET_DELETE_DOWN="`eval_boolean_parameter SIMPLARET_DELETE_DOWN 1`"
    SIMPLARET_UPDATE="`eval_boolean_parameter SIMPLARET_UPDATE 0`"
    SIMPLARET_DELETE_DURING="`eval_boolean_parameter SIMPLARET_DELETE_DURING 0`"
    SIMPLARET_PURGE_PATCHES="`eval_boolean_parameter SIMPLARET_PURGE_PATCHES 0`"
    PASSIVE_FTP="`eval_boolean_parameter PASSIVE_FTP 0`"
    WARNING="`eval_boolean_parameter WARNING 0`"
    SIGNATURE_CHECKING="`eval_boolean_parameter SIGNATURE_CHECKING 0`"
    DEPENDENCY_CHECKING="`eval_boolean_parameter DEPENDENCY_CHECKING 1`"
    TEMPLATES_UNDER_SVN="`eval_boolean_parameter TEMPLATES_UNDER_SVN 0`"

    # Enabling this option (i.e, setting to "1" or "yes"), simplaret will
    # donwload even # already applied patches, a good option when you plan
    # to keep local copies of all needed patches for your system
    DOWNLOAD_EVEN_APPLIED_PATCHES="`eval_boolean_parameter DOWNLOAD_EVEN_APPLIED_PATCHES 0`"

    # Enabling this option, jail-upgrade will look at your
    # standard repositories for new packages; if it find a package
    # with different version of your current installed package and
    # also this package isnt in the packages folder, then the new
    # package is apllied; if in doubt, just say no or leave blank.
    CONSIDER_ALL_PACKAGES_AS_PATCHES="`eval_boolean_parameter CONSIDER_ALL_PACKAGES_AS_PATCHES 0`"

    # Enabling this option (i.e, setting to "1" or "yes"), simplaret will
    # store patches it finds on ROOT repositories on
    #
    #   $PATCHES_DIR/$ARCH/$VERSION/root-$repository_name.
    #
    # By default this option is turned off because it breaks the standard
    # way to store packages and can cause some confusion, but its an useful
    # feature if you like to see all patches apart from common packages and/or
    # stored in the same tree.
    STORE_ROOT_PATCHES_ON_PATCHES_DIR="`eval_boolean_parameter STORE_ROOT_PATCHES_ON_PATCHES_DIR 0`"

    # now we place "patches" on the top of ROOT_PRIORITY
    ROOT_PRIORITY="patches `echo $ROOT_PRIORITY | sed -e 's/patches//'`"

  else
    echo $1 error: config file $CONFIG not found
    exit 1
  fi

  if [ ! -d "$STORAGE" ]; then
    mkdir -p $STORAGE
  fi

  if [ ! -d "$PATCHES_DIR" ]; then
    mkdir -p $PATCHES_DIR
  fi

  if [ -z "$ARCH" ]; then
    ARCH="$DEFAULT_ARCH" 
  fi

  if [ -z "$VERSION" ]; then
    VERSION="$DEFAULT_VERSION"
  fi

  if [ "$FTP_TOOL" != "wget" ] && [ "$FTP_TOOL" != "curl" ] && [ "$FTP_TOOL" != "ncftpget" ]; then
    echo "$1 configuration error: invalid value $FTP_TOOL for config parameter FTP_TOOL"
    echo "$1 assuming value \"curl\" for variable FTP_TOOL"
    FTP_TOOL="curl"
  fi

  if [ "$HTTP_TOOL" != "wget" ] && [ "$HTTP_TOOL" != "curl" ]; then
    echo "$1 configuration error: invalid value $HTTP_TOOL for config parameter HTTP_TOOL"
    echo "$1 assuming value \"curl\" for variable HTTP_TOOL"
    HTTP_TOOL="curl"
  fi

  if which $SIMPLARET &> /dev/null; then
    if [ "$SIMPLARET_UPDATE" == "1" ]; then
      if [ "$2" == "-u" ]; then
        ARCH=$ARCH VERSION=$VERSION $SIMPLARET --update
      fi
    fi
  else
    echo "$SIMPLARET not found, please install it before run $0"
  fi

  if [ "$TEMPLATE_STORAGE_STYLE" != "simplepkg-folder" ] && \
     [ "$TEMPLATE_STORAGE_STYLE" != "templates-folder" ] && \
     [ "$TEMPLATE_STORAGE_STYLE" != "own-folder" ]; then
    TEMPLATE_STORAGE_STYLE="own-folder"
  fi

  if [ ! -z "$ROOT" ]; then
    JAIL_ROOT="$ROOT"
  fi

}

function default_version {

  # get version from /etc/slackware-version
  if [ -f "$1/etc/slackware-version" ]; then
    cat $1/etc/slackware-version | awk '{ print $2 }' | sed -e 's/.0$//'
  else
    echo "none"
  fi

}

function default_arch {

  # get arch from /etc/slackware-version

  local arch
  arch="`cat $1/etc/slackware-version | awk '{ print $3 }' | sed -e 's/(//' -e 's/)//'`"

  if [ -z "$arch" ]; then
    echo i386
  else
    echo $arch
  fi

}

function search_default_template {

  if [ -e "$BASE_CONF/default.template" ]; then
    TEMPLATE_BASE="$BASE_CONF/default"
    echo $BASENAME using default template
  elif [ -e "$TEMPLATE_FOLDER/default.template" ]; then
    TEMPLATE_BASE="$TEMPLATE_FOLDER/default"
    echo $BASENAME: using default template
  elif [ -e "$TEMPLATE_FOLDER/default/default.template" ]; then
    TEMPLATE_BASE="$TEMPLATE_FOLDER/default/default"
    echo $BASENAME: using default template
  elif [ -e "$BASE_CONF/defaults/templates/default/default.template" ]; then
    TEMPLATE_BASE="$BASE_CONF/defaults/templates/default"
    echo $BASENAME using default template
  else
    echo $BASENAME: error: default template not found
    echo $BASENAME: please create a template using templatepkg
    return 1
  fi

}

function search_template {

  # determine the template to be used
  # usage: search-template <template-name> [--new | --update]

  #
  # templates can be stored either on
  #
  # - $BASE_CONF/template_name.template
  # - $TEMPLATE_FOLDER/template_name.template
  # - $TEMPLATE_FOLDER/template_name/template_name.template
  #
  # also, there's a folder for "oficial" simplepkg templates,
  # $BASE_CONF/defaults/templates/ and you can override any template
  # in the default folder by placing a template with the same name
  # in the template storage folders
  #

  if [ -f "$BASE_CONF/$1.template" ]; then
    TEMPLATE_BASE="$BASE_CONF/$1"
  elif [ -f "$TEMPLATE_FOLDER/$1.template" ]; then
    TEMPLATE_BASE="$TEMPLATE_FOLDER/$1"
  elif [ -f "$TEMPLATE_FOLDER/$1/$1.template" ]; then
    TEMPLATE_BASE="$TEMPLATE_FOLDER/$1/$1"
  elif [ -f "$BASE_CONF/defaults/templates/$1/$1.template" ]; then
    TEMPLATE_BASE="$BASE_CONF/defaults/templates/$1/$1"
  else
    if [ "$2" == "--new" ]; then
      # we need to return the path for a new template
      if [ "$TEMPLATE_STORAGE_STYLE" == "simplepkg-folder" ]; then
        TEMPLATE_BASE="$BASE_CONF/$1"
      elif [ "$TEMPLATE_STORAGE_STYLE" == "templates-folder" ]; then
        TEMPLATE_BASE="$TEMPLATE_FOLDER/$1"
      else
        TEMPLATE_BASE="$TEMPLATE_FOLDER/$1/$1"
      fi
    elif [ "$2" == "--update" ]; then
      return 1
    else
      echo $BASENAME: template $1 not found
      search_default_template
    fi
  fi

}

function numeric_perm {

  # get the numeric permission of a file
  # usage: numeric_perm <file-name>

  # just a bit of forbidden secrets

  if [ -a "$1" ]; then
    ls -lnd $1 | awk '{ print $1 }' | \
    sed -e 's/^.//' -e 's/r/4/g' -e 's/w/2/g' -e 's/x/1/g' \
        -e 's/-/0/g' -e 's/\(.\)\(.\)\(.\)/\1+\2+\3/g' |   \
    fold -w5 | bc -l | xargs | sed -e 's/ //g'
  fi

}

function get_owner {

  # get the numeric owner for a file
  # usage: get_owner <file>

  if [ -a "$1" ]; then
    ls -lnd $1 | awk '{ print $3 }'
  fi

}

function get_group {

  # get the numeric group for a file
  # usage: get_group <file>

  if [ -a "$1" ]; then
    ls -lnd $1 | awk '{ print $4 }'
  fi

}

function use_svn {

  # check if svn usage is enabled

  if [ "$TEMPLATES_UNDER_SVN" == "1" ] && \
     [ "$TEMPLATE_STORAGE_STYLE" == "own-folder" ]; then
     return 0
   else
     return 1
   fi

}

function svn_check {

  # check if a file is under svn
  # usage: svn_check <file>

  local cwd

  cwd="`pwd`"
  cd `dirname $1`

  if [ "`svn status $1 | awk '{ print $1 }'`" == "?" ]; then
    return 1
  else
    return 0
  fi

  cd $cwd

}

function update_template_files {

  # update template files from svn
  # usage: update_template_files

  if use_svn && [ -d "$TEMPLATE_BASE.d/.svn" ]; then
    echo Checking out last template revision from svn...
    cd `dirname $TEMPLATE_BASE`
    svn update
  fi

}

function copy_template_files {

  # copy template files into jail
  # usage: copy_template_files <jail-path>

  if [ -d "$1" ]; then
    if [ -d "$TEMPLATE_BASE.d" ]; then 
      echo "Copying template files to $1..."
      if use_svn && [ -d "$TEMPLATE_BASE.d/.svn" ]; then
        rsync -av --exclude=.svn $TEMPLATE_BASE.d/ $1/
      else
        rsync -av $TEMPLATE_BASE.d/ $1/
      fi
    fi
  fi

}

function set_jail_perms {

  # set template file permissions under a jail
  # usage: set_jail_perms <jail-path>

  if [ -s "$TEMPLATE_BASE.perms" ]; then
    echo Setting jail $1 permissions...
    cat $TEMPLATE_BASE.perms | while read entry; do
      file="`echo $entry | cut -d ";" -f 1`"
      if [ -a "$TEMPLATE_BASE.d/$file" ] && [ -a "$1/$file" ]; then
        owner="`echo $entry | cut -d ";" -f 2`"
        group="`echo $entry | cut -d ";" -f 3`"
        perms="`echo $entry | cut -d ";" -f 4`"
        chmod $perms $1/$file
        chown $owner:$group $1/$file
      fi
    done
  fi

}

function slash {

  # remove additional slashes
  echo $1 | sed -e 's/\/\+/\//g'

}