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#!/bin/bash
###################### COPYRIGHT/COPYLEFT ######################
# (C) 2016 Intel Deutschland GmbH
# Author: Michael Soegtrop
#
# Released to the public by Intel under the
# GNU Lesser General Public License Version 2.1 or later
# See https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
#
# With very valuable help on building GTK from
# https://wiki.gnome.org/Projects/GTK+/Win32/MSVCCompilationOfGTKStack
# http://www.gaia-gis.it/spatialite-3.0.0-BETA/mingw64_how_to.html
###################### Script safety and debugging settings ######################
set -o nounset
# Print usage
if [ "$#" -lt 1 ] ; then
echo 'Diff a tar (or compressed tar) file with a folder'
echo 'difftar-folder.sh <tarfile> [<folder>] [strip]'
echo default for folder is .
echo default for strip is 0.
echo 'strip must be 0 or 1.'
exit 1
fi
# Parse parameters
tarfile=$1
if [ "$#" -ge 2 ] ; then
folder=$2
else
folder=.
fi
if [ "$#" -ge 3 ] ; then
strip=$3
else
strip=0
fi
# Get path prefix if --strip is used
if [ "$strip" -gt 0 ] ; then
prefix=`tar -t -f $tarfile | head -1`
else
prefix=
fi
# Original folder
if [ "$strip" -gt 0 ] ; then
orig=${prefix%/}.orig
elif [ "$folder" = "." ] ; then
orig=${tarfile##*/}
orig=./${orig%%.tar*}.orig
elif [ "$folder" = "" ] ; then
orig=${tarfile##*/}
orig=${orig%%.tar*}.orig
else
orig=$folder.orig
fi
echo $orig
mkdir -p "$orig"
# Make sure tar uses english output (for Mod time differs)
export LC_ALL=C
# Search all files with a deviating modification time using tar --diff
tar --diff -a -f "$tarfile" --strip $strip --directory "$folder" | grep "Mod time differs" | while read -r file ; do
# Substitute ': Mod time differs' with nothing
file=${file/: Mod time differs/}
# Check if file exists
if [ -f "$folder/$file" ] ; then
# Extract original file
tar -x -a -f "$tarfile" --strip $strip --directory "$orig" "$prefix$file"
# Compute diff
diff -u "$orig/$file" "$folder/$file"
fi
done
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