#!/bin/sh

# emerge_rsync.sh
#
# Alternative shell script to 'emerge rsync' that tries to keep the unmasked packages'
#
# Just have your unmasked packages by double commenting them out, i.e., inserting '##' before them, and run this script
#
# 	José Fonseca <j_r_fonseca@yahoo.co.uk>

PACKAGE_MASK=/usr/portage/profiles/package.mask
PACKAGE_MASK_OLD=`mktemp` || exit 1
PACKAGE_MASK_NEW=`mktemp` || exit 1

# Copy the old package.mask
cp $PACKAGE_MASK $PACKAGE_MASK_OLD || exit 1

emerge rsync || exit 1

# Mimic the packages unmasked by '#' in the old package.mask
python package.py $PACKAGE_MASK_OLD $PACKAGE_MASK > $PACKAGE_MASK_NEW || exit 1

# One can choose between two diffs:
#
#   diff -u $PACKAGE_MASK $PACKAGE_MASK_NEW
# 
# shows what has been unmasked again, while
#
#   diff -u $PACKAGE_MASK_OLD $PACKAGE_MASK_NEW
#
# shows what changed between your previous and suggested package mask. 
# The later shows also what has been added so I find it a little more interesting, and if there is no change then it's obvious too, and one doesn't need too take much attention to it. ;-)
#
# It would be nice if less allowed to quit with non-zero return value, but unfortunately if you want to avoid the changes you'll have to hit Ctrl-Z and kill it...
if diff -u $PACKAGE_MASK_OLD $PACKAGE_MASK_NEW | less
then
	mv -f $PACKAGE_MASK_NEW $PACKAGE_MASK
else
	rm -f $PACKAGE_MASK_NEW
fi
rm -f $PACKAGE_MASK_OLD

# Leave this here if you also want to know what new stuff is available
emerge --update --pretend world