An easier way to update your world

#!/bin/bash
# update-world 1.5
# count_zero 2006
# Licensed under the GPLv2
#
# update-world is a bash script that forces an emerge -uD world to continue, even
# in the face of (inevitable) compile failures. Failed builds are added to a list,
# and the script jumps to the next package in the queue.
#
# just run update-world --prepare (or --empty) followed by update-world --install.
#
# Release Notes:
# v1.5: now handles 'fetch restriction' properly
# v1.4: uses '--newuse' for emerges to respect new use flags
# v1.3: uses '--oneshot' for emerges so they don't get added to the world file.
# v1.2: Script now detects log directly instead of accepting only /var/log/portage
# v1.1: minor bugfix to allow package without version to be added to 'emergelist'
# v1.0: Release
#
#
# Set the program directory and important variables
homedir=~/.update-world
workdir="$homedir/`date +%F`"
logdir="$workdir/log"
mkdir -p $logdir
touch $homedir/failedlist
emergelist=$homedir/emergelist
emergetemp=$workdir/emergetemp
failedlist=$homedir/failedlist
portlogdir=`cat /etc/make.conf | grep PORT_LOGDIR | sed 's/PORT_LOGDIR=//' | sed 's/\"//g' | sed 's/\/$//'`
masked=$homedir/masked
# parameter for '--empty' to emerge -e world
if [[ $1 == '--empty' || $1 == '-e' ]]
 then parameter='-pev'
 else parameter='-puvD --newuse'
fi
#### update-world --prepare ####
# Prepare the list of packages to emerge into emerglist
if [[ $1 == "--prepare" || $1 == "-p" || $1 == '--empty' || $1 == '-e' ]]
 then
 if [[ -e $emergelist ]]
 then echo -n "The file 'emergelist' already exists and will be overwritten.
Continue anyway? (y/n) "
 read continue
 if [[ $continue == 'y' || $continue == 'yes' || $continue == 'Y' || $continue == 'Yes' || $continue == 'YES' || $continue == '' ]]
 then :
 else echo exiting.
 exit 0
 fi
 else :
 fi
 emerge $parameter world | tee $emergelist
 # Make sure there are no errors in the emerge process
echo
 if grep -q "blocks B " $emergelist
 then echo "WARNING: You have a blocking package. Fix this before continuing."
 rm -f $emergelist
 exit 1
 elif grep -q "masked" $emergelist
 then echo "WARNING: You need to unmask some packages before continuing."
 rm -f $emergelist
 exit 1
 elif grep -q "emerge: there are no ebuilds to satisfy" $emergelist
 then echo "WARNING: One of the specified packages doesn't exist"
 rm -f $emergelist
 exit 1
 elif grep -q 'Fetch Restriction' $emergelist
 then fetchrestricted=`cat $emergelist | grep ^[[]ebuild[A-Za-z\ ]*F[A-Za-z\ ]*[]] | grep -o []][a-zA-Z0-9\/.\ -]*[[] | sed 's/\]\ //' | sed 's/\ \[//'`
 echo "WARNING: The following packages have Fetch Restriction turned on:
$fetchrestricted

Please download the sources from the location specified in the ebuild to /usr/portage/distfiles/ and rerun this script."
 exit 1
 else :
 fi
 echo "
These are the packages that will be installed. If you want to alter this list,
just edit the file 'emergelist' in $homedir. When finished, run
'update-world --install'"
 cat $emergelist | sed '/^[TC]/d' | sed 's/\[ebuild.*[ A-Z]\]\ //' | sed '/^[ ]/d' | sed '/^[ ]*$/d' | sed '/Portage\ overlays/d' | sed 's/\ .*$//' | sort -d | sed 's/.*/\=&/' > $emergetemp
 mv $emergetemp $emergelist
 rm -f $failedlist
 exit 0
#### update-world --install ####
# Install the packages listed in emergelist
elif [[ $1 == "--install" || $1 == "-i" ]]
 then
 # Verify that the emergelist doesn't produce errors
 cat $emergelist | xargs emerge -p > $emergetemp
 if grep -q "blocks B " $emergetemp
 then echo "WARNING: You have a blocking package. Fix this before continuing."
 rm -f $emergetemp
 exit 1
 elif grep -q "masked" $emergelist
 then echo "WARNING: You need to unmask some packages before continuing."
 rm -f $emergetemp
 exit 1
 elif grep -q "emerge: there are no ebuilds to satisfy" $emergelist
 then echo "WARNING: One of the specified packages doesn't exist"
 rm -f $emergetemp
 exit 1
 elif [[ -z `cat $emergelist` ]]
 then echo "WARNING: no 'emergelist' exists. Did you run 'update-world --prepare' first?"
 rm -f $emergetemp
 exit 1
 else :
 fi
 # Until loop to make portage continue until finished
 increment=0
 until [[ $increment == 1 ]]
 do
 cat $emergelist | xargs emerge -1
 # Detect which packages have been successfully emerged and remove from the queue
 installed=`tac /var/log/emerge.log | sed '/Started\ emerge/,$d' | grep "completed emerge" | sed 's/^.*)\ //' | sed 's/\ to.*//'`
 for each in $installed
 do
 eachsed=`echo $each | sed 's|\/|\\\/|'`
 if [[ -z `cat $emergelist | grep $each` ]]
 then eachsed=`echo $eachsed | sed 's/\-[0-9].*//'`
 else :
 fi
 cat $emergelist | sed "/$eachsed/d" > $emergetemp
 mv $emergetemp $emergelist
 done
 # See if all packages have been emerged
 if [[ -z `cat $emergelist` ]]
 then increment=1
 else :
 fi
 if [[ $increment == 0 ]]
 then
 errorlog=`ls -t $portlogdir | sed '2,$d'`
 if [[ -n `cat $portlogdir/$errorlog | grep 'signal 2'` ]]
 then echo "
*** User hit 'Control-C' ... exiting.
"
 exit 1
 else :
 fi
 sleep 5
 echo
 echo "*** Hit Control-C to exit, or just wait to continue with emerge."
 echo
 sleep 10
 echo "*** Continuing with emerge."
 # Detect failed emerge and add to failedlist, remove failed package from emergelist
 failedpkg=`tac /var/log/emerge.log | sed '1d' | sed '/terminating/,$d' | sed '/completed\ emerge/,$d' | grep ">>>" | sed 's/.*)\ //' | sed 's/\ to.*//'`
 if [[ -n `tail -n 1 $failedlist | grep $failedpkg` ]]
 then echo "The failed package $failedpkg could not be merged and must be successfully installed before continuing."
 exit 1
 else :
 fi
 echo $failedpkg >> $failedlist
 failedpkgsed=`echo $failedpkg | sed 's|\/|\\\/|'`
 cat $emergelist | sed "/$failedpkgsed/d" > $emergetemp
 mv $emergetemp $emergelist
 ln -s $portlogdir/$errorlog $logdir/${errorlog}_error-log
 echo
 echo
 echo "*** $failedpkg compile failed, skipping."
 # Is there a package in 'emergelist' that requires the failed pkg as a dep? If so, remove it too.
 failedpkgdeps=`echo $failedpkg | sed 's/-[0-9].*//'`
 deps=`equery depends $failedpkgdeps | sed '/^\[/d' | sed 's/-[0-9].*//'`
 for each in `echo $deps`
 do
 if [[ -n `cat $emergelist | grep "$each"` ]]
 then
 if [[ -n `emerge -p $each | grep "$failedpkg"` ]]
 then
 each2=`cat $emergelist | grep $each | sed 's/\=//'`
 echo "$each2 (depends on $failedpkg)" >> $failedlist
 eachsed=`echo $each | sed 's|\/|\\\/|'`
 cat $emergelist | sed "/$eachsed/d" > $emergetemp
 mv $emergetemp $emergelist
 echo "*** $each depends on $failedpkg, skipping."
 else :
 fi
 else :
 fi
 done
 echo "*** Continuing with emerge world"
 else :
 fi
 done
# if improper argument is given to 'update-world' display the help text
else echo "update-world 1.0
count_zero 2006
licensed under the GPLv2

Description:
This is a bash script to automate the 'emerge -uD world' process.
Its purpose is to make updating the system as hands-free as possible.
It does this by automatically recovering from a failed emerge and moving
on to the next one, presenting the user with a list of failed packages
once the update has finished. No more 'babysitting' the update process!
Just start it, and deal with any failed packages at the end. Log files
from the failed emerges are saved in the log directory.

The default program directory is ~/.update-world

Usage:
update-world [--prepare | -p ]
 Prepares a list of packages produced by 'emerge -puvD world'
 and outputs them to the file 'emergelist' in the current directory.
 Add, remove, or change the version of any of the packages listed
 in this file with your favorite editor before continuing.
update-world [--empty | -e ]
 Same as --prepare except it performs 'emerge -ev world' to recompile
 all packages on a system.
update-world [--install | -i ]
 Begins the emerge process based upon the 'emergelist' file created
 from running 'update-world --prepare'. Once finished, failed builds
 will be saved in the file 'failedlist' in the current directory."
exit 1
fi


echo "Congratulations! 'emerge world' complete."
echo
# All done! display the failed packages, if any
if [[ -z `cat $failedlist` ]]
 then echo "All packages emerged successfully"
 else echo "These packages couldn't be merged due to compile errors:"
 echo
 cat $failedlist
 echo
 echo "Look in $logdir/ for the portage log files of the failed builds.
Check bugs.gentoo.org or the Gentoo Forums for help."
fi
exit 0