Re: [gentoo-user] Another reason to begin USE with "-*"

[Roy Wright <royw@cisco.com>]

Boyd Stephen Smith Jr. wrote:

>The -pv output of emerge shows this.  A flag that was not available in your 
>current version but it available in the one you are installing, will be 
>colored yellow and postfixed with '%'.
>
>  
>

Great.  So something like the following in my cron.daily/portage.update 
script should do the job:


echo "Save old use.desc"
rm -f /usr/portage/profiles/use.desc.old
cp /usr/portage/profiles/use.desc /usr/portage/profiles/use.desc.old

echo "Save old use.local.desc"
rm -f /usr/portage/profiles/use.local.desc.old
cp /usr/portage/profiles/use.local.desc 
/usr/portage/profiles/use.local.desc.old

echo "Syncing portage tree..."
emerge --sync 2>> /var/log/portage.cron.log > /dev/null
status=$?

if [ $status -ne 0 ]; then
        echo "Portage sync failed, exiting update."
        exit $status
fi

echo "Changed use flags:"
diff /usr/portage/profiles/use.desc.old /usr/portage/profiles/use.desc
diff /usr/portage/profiles/use.local.desc.old 
/usr/portage/profiles/use.local.desc

echo "Running eupdatedb..."
eupdatedb --quiet --nocolor 2> /dev/null

echo "Running update-eix..."
update-eix --quiet

echo "Checking for updates..."
rm -f /tmp/emerge.output
/usr/local/sbin/einfo --update --deep --newuse world
emerge --update --deep --pretend --verbose --nospinner --newuse world > 
/tmp/emerge.output
emerge --update --deep --fetchonly --quiet --nospinner --newuse world >> 
/tmp/emerge.output
cat /tmp/emerge.output

echo "New USE flags indicated by trailing percent sign in:"
grep -P "\S+%" /tmp/emerge.output


Thank you,
Roy
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