Backups to supplement Pacman based restores

pacdiff.sh

#!/bin/bash
#
# Creates a tarsnap backup of all files we can't reasonably expect to get back
# from pacman.  Files matching these conditions are included:
#
#   1. located in /etc and not owned by any package
#   2. owned by a package and modified since installation

# Create temporary space
INCLUDES=$(mktemp)
ROOT=$(mktemp -d /dev/shm/root.XXXXXXXX)

echo "Building package list..."

# Files in /etc not owned by any package
find /etc -type f -print0 \
        | xargs -0 pacman -Qo 2>&1 \
        | awk '/^error:/ { print $5 }' \
        >> $INCLUDES

# Files modified since installation
pacman -Qkk 2>&1 \
        | awk '/Size mismatch/ { print $3 }' \
        >> $INCLUDES

echo "Creating temporary filesystem..."

# Build dummy root
rsync -av --files-from $INCLUDES / $ROOT/

echo "Backing up temporary filesystem..."

# Backup dummy root
tarsnap -C $ROOT/ -cf pacdiff.$(date +%F) .

# Cleanup temporary space
rm -r $INCLUDES $ROOT