gentoo-update

#!/bin/bash

# Script to keep a Gentoo system fully up-to-date and clean.
# See http://pastebin.com/sAHz1FqH for oldlib-check.
# Author: Marijn van Zon <marijn@suninet.org>

function show_usage {

    echo "Usage: gentoo-update [options]"
    echo
    echo -e "\t--sync\t\tforce sync of portage tree"
    echo -e "\t--no-sync\tdo not sync portage tree"
    echo

    exit
}

sync=-1

for i in $(seq 1 ${#}); do

    eval param="\${${i}}"

    case "${param}" in
        "--sync")    sync=1 ;;
        "--no-sync") sync=0 ;;
    *)           show_usage ;;
    esac
done

if [[ $sync -lt 0 ]]; then

    lastsync=$(grep 'Sync completed' /var/log/emerge.log |sed -n '$ s/:.*//p')
    current=$(date +%s)
    let diff="$current - $lastsync"

    if [[ $diff -lt 86400 ]]; then
        echo
    echo -n "Skipping sync, last sync was: "
    date -R -d @$lastsync
        sync=0
    else
        sync=1
    fi
fi

if [[ $sync -eq 1 ]]; then
    sync="eix-sync -v"
else
    sync="echo -n"
fi

$sync && \
emerge -uvDNa --with-bdeps=y @world && \
etc-update && \
emerge -ca && \
/usr/local/sbin/oldlib-check && \
revdep-rebuild && \
eclean-dist --destructive