script to check what files don't belong to any package on /. Depends on equery and qlist

checkroot.bash

#!/bin/bash

loginfo() {
    echo $* >&2
}

lastcheck() {
    lines=$(equery -q belongs $1 |wc -l)
    if test $lines -eq 0; then
        return 0
    else
        return 1
    fi
}

excluded() {
    for dir in $exclude; do
        if [ $1 == $dir ]; then
            return 0
        fi
    done
    return 1
}

recwalk() {
    loginfo "recwalk in $1"
    cd $1
    for file in *; do
        if ! excluded $file; then
            regexp="'$(pwd)/${file}'"
            if ! grep -q "$(pwd)/${file}" $2; then
                lastcheck "$(pwd)/${file}" && echo "$(pwd)/$file"
            fi
            if test -d "${file}"; then
                if grep -q "$(pwd)/${file}" $2 || ! lastcheck "$(pwd)/${file}"; then
                    recwalk "$(pwd)/${file}" $2
                fi
            fi
        fi
    done
    cd ..
}

#exclude some directories
exclude="/tmp /home /dev /proc /var/db /sys /boot /etc/config-archive /lib/modules /lib/firmware /mnt /media /lost+found /root"

loginfo "making tempfile"
tmpfile=$(mktemp)
loginfo "tempfile is $tmpfile"

loginfo "getting files list"
for pkg in $(qlist -IC); do
    qlist -C "$pkg" >> $tmpfile
done
loginfo "done getting files list"

#start in /
loginfo "Starting in /"
for i in /*; do
    if ! echo $exclude |grep -q $i; then
        recwalk $i $tmpfile
    fi
done

loginfo "done, removing temporary file"
rm $tmpfile