path: root/savelocaltweaks

#!/bin/sh

set -e

basedir="/etc"
targetdir="$(mktemp -td localtweaks.XXXXXX)"
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
files="$(for x in $files; do echo "$x"; done | uniq | sort)"
for file in $files; 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" || [ $? -lt 2 ]
        chown --reference="$basedir/$file" "$targetdir/$basedir/$file.diff"
        chmod --reference="$basedir/$file" "$targetdir/$basedir/$file.diff"
        chmod a-x "$targetdir/$basedir/$file.diff"
    fi
done