path: root/savelocaltweaks

#!/bin/sh

#set -e

basedir="/etc"
targetdir="/tmp/localtweaks"
includefile="/etc/local/localtweaks.include"
excludefile="/etc/local/localtweaks.exclude"
extensions=".orig .old"

for ext in $extensions; do
    extfiles="`find $basedir -name \*$ext`"
    for extfile in $extfiles; do
        xextfile="${extfile%$ext}"
        files="$files ${xextfile#$basedir}"
    done
done

includes=""
if [ -d "`dirname $includefile`" ] && [ -r $includefile ]; then
    includes="`cat $includefile`"
    for include in $includes; do
        files="$files ${include#$basedir}"
    done
fi

excludes=""
if [ -d "`dirname $excludefile`" ] && [ -r $excludefile ]; then
    xexcludes="`cat $excludefile`"
    for exclude in $xexcludes; do
        excludes="$excludes ${exclude#$basedir}"
    done
fi

# process all files once each
for file in `for x in $files; do echo $x; done | uniq | sort`; do

    # file were chosen based on backups - it may not exist itelf
    [ -s "$basedir/$file" ] || continue

    for exclude in $excludes; do
        [ "$file" = "$exclude" ] && continue 2
    done

    ext=""
    for xext in $extensions; do
        if [ -e $basedir/$file$xext ]; then
            ext="$xext"
            continue
        fi
    done

    newdir="$targetdir/$basedir/`dirname $file`"
    mkdir -p $newdir
    cp -af $basedir/$file $newdir

    # Only diff against existing and non-empty files.
    if [ -n "$ext" ] && [ -s $basedir/$file$ext ]; then
        diff -ruN $basedir/$file$ext $basedir/$file > $targetdir/$basedir/$file.diff
        chown --reference=$basedir/$file $targetdir/$basedir/$file.diff
        chmod --reference=$basedir/$file $targetdir/$basedir/$file.diff
        chmod a-x $targetdir/$basedir/$file.diff
    fi
done