#!/bin/bash
#
#
# glcu - gentoo linux cron update
# script for keeping your Gentoo linux up to date
# 
# Version 0.65 - written by Michael Panhorst - glcu [at] panhorst [dot] com
# (This software is free [as in beer] - released under the GPL)
#
# put this script in the /etc/cron.weekly directory 
# You need to have mailx, esearch and gentoolkit emerged 


# Set your eMail address first:
EMAILADRESS=root

# set if you want to test (and build) emerge 'system' or 'world'
UPDATE=system


################################################################
# You shouldn't need to change anything below this line


PKGDIR="/usr/portage/packages"
source /etc/make.conf  # in case you set PKGDIR different
SUBJECT="glcu: New ebuilds for emerge $UPDATE on $HOSTNAME"
FS=""
EXTRA=""

# 1. emerge sync ############## (sync first) ####################

emerge sync 2>/tmp/emergesync.$$

# and run fixpackages (if needed)

grep "Skipping packages. Run 'fixpackages' or set it in FEATURES" /tmp/emergesync.$$

if [ $? == 0 ]
    then
    echo "" >>/tmp/ecdep.$$
    echo "Running fixpackages" >>/tmp/ecdep.$$
    echo "" >>/tmp/ecdep.$$
    fixpackages 2>>/tmp/ecdep.$$
    echo "" >>/tmp/ecdep.$$
fi

# 2. update database for esearch ################################

eupdatedb 2>>/tmp/emergesync.$$

# 3. glsa-check - check for security updates ####################

glsa-check -l -n|grep " \[N\] " >/tmp/eupdate.$$
if [ $? == 0 ]
    then
    echo "" >>/tmp/emergesync.$$
    echo "----------------------------------------------------------------------" >>/tmp/emergesync.$$
    echo "Important Security updates for $HOSTNAME:" >>/tmp/emergesync.$$
    echo "" >>/tmp/emergesync.$$
    cat /tmp/eupdate.$$ >> /tmp/emergesync.$$
    echo "" >>/tmp/emergesync.$$
    echo "" >>/tmp/emergesync.$$
    echo "*** Run 'glsa-check --fix new' to auto-apply all security updates" >>/tmp/emergesync.$$
    echo "         ====================" >>/tmp/emergesync.$$
    echo "" >>/tmp/emergesync.$$
    echo "----------------------------------------------------------------------" >>/tmp/emergesync.$$

    FS="- SECURITY UPDATES!"
fi

# only send a mail if errors ocurred
if [ -s /tmp/emergesync.$$ ]
then
    if [ -s /tmp/ecdep.$$ ]
	then
	cat /tmp/ecdep.$$ >> /tmp/emergesync.$$
    fi
	cat /tmp/emergesync.$$ | mail -s "glcu($HOSTNAME): emerge sync $FS" $EMAILADRESS 
fi



# 4. emerge -pv system/world (check for needed/new ebuilds) ###

emerge --pretend --deep $UPDATE > /tmp/eupdate.$$ 2>&1

# prebuild (emerge --buildpkgonly) all needed packages

grep ebuild /tmp/eupdate.$$

if [ $? == 0 ]
    then
    echo "- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -" >> /tmp/ecdep.$$
    echo "List of new Packages:" > /tmp/ecdep.$$
    echo "---------------------" >> /tmp/ecdep.$$
    grep ebuild /tmp/eupdate.$$ >> /tmp/ecdep.$$ 
    echo "---------------------------------------------------------------------" >> /tmp/ecdep.$$

    for package in `cat /tmp/eupdate.$$ | grep ebuild | cut -f 2- -d "/" | cut -f 1 -d " "` ;
      do
      if [ ! -f $PKGDIR/All/$package.tbz2 ]
	  then 
	  echo "" >> /tmp/ecdep.$$
	  echo "Building binary package for $package :" >> /tmp/ecdep.$$

	  emerge --pretend --buildpkgonly --oneshot =$package > /tmp/eupdate.$$
	  if [ ` grep -c ebuild /tmp/eupdate.$$ ` == 1 ] 
	      then
	      nice -n +19 emerge --buildpkgonly --oneshot =$package 2>> /tmp/ecdep.$$
	      if [ $? == 0 ]
		  then
		  PACKAGES="$PACKAGES =$package"
		  else
		  echo "" >> /tmp/ecdep.$$
		  echo " ***  Error while building $package!" >> /tmp/ecdep.$$
		  SUBJECT="glcu: DEPENDENCY PROBLEM, COULDN'T PREBUILD ALL PACKAGES ON $HOSTNAME"
		  DEP=1
	      fi

	      else
	      echo " *** Dependencies for $package not met." >> /tmp/ecdep.$$
	      echo " *** Cannot prebuilt $package!" >> /tmp/ecdep.$$
	      SUBJECT="glcu: DEPENDENCY PROBLEM, COULDN'T PREBUILD ALL PACKAGES ON $HOSTNAME"
	      DEP=1
	  fi

      fi
    done

    echo "New packages for 'emerge $UPDATE'!" > /tmp/glcu.$$
    echo "                  =============" >> /tmp/glcu.$$
    echo "" >> /tmp/glcu.$$

    if [ -n "$PACKAGES" ]
	then
	echo "To update your gentoo linux, execute:" >> /tmp/glcu.$$
	echo "" >> /tmp/glcu.$$
	echo "  emerge -avK $PACKAGES" >> /tmp/glcu.$$
	echo "" >> /tmp/glcu.$$
	EXTRA=further
	SEND=1
    fi

    if [ $DEP ]
	then
	echo "check for $EXTRA packages with:" >> /tmp/glcu.$$ 
	echo "" >> /tmp/glcu.$$
	echo "  emerge -av $UPDATE" >> /tmp/glcu.$$ 
	echo "" >> /tmp/glcu.$$
	SEND=1
    fi


    cat /tmp/ecdep.$$ >> /tmp/glcu.$$

    # send mail, how to update the system

    if [ $SEND ]
	then
	cat /tmp/glcu.$$ | mail -s "$SUBJECT" $EMAILADRESS
    fi

# rm all used files

    rm /tmp/glcu.$$

fi

rm /tmp/emergesync.$$ /tmp/eupdate.$$ /tmp/ecdep.$$