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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
###################### DIFF A TAR FILE AND A FOLDER ######################
set -o nounset
# Print usage
if [ "$#" -lt 2 ] ; then
echo 'Diff a tar (or compressed tar) file with a folder'
echo 'difftar-folder.sh <tarfile> <folder> [strip]'
echo '<tarfile> is the name of the tar file do diff with (required)'
echo '<folder> is the name of the folder to diff with (required)'
echo '<strip> is the number of path components to strip from tar file (default is 0)'
echo 'All files in the tar file must have at least <strip> path components.'
echo 'This also adds new files from folder.new, if folder.new exists'
exit 1
fi
# Parse parameters
tarfile=$1
folder=$2
if [ "$#" -ge 3 ] ; then
strip=$3
else
strip=0
fi
# Get path prefix if --strip is used
if [ "$strip" -gt 0 ] ; then
# Get the path/name of the first file from teh tar and extract the first $strip path components
# This assumes that the first file in the tar file has at least $strip many path components
prefix=$(tar -t -f "$tarfile" | head -1 | cut -d / -f -$strip)/
else
prefix=
fi
# Original folder
orig=$folder.orig
mkdir -p "$orig"
# New amd empty filefolder
new=$folder.new
empty=$folder.empty
mkdir -p "$empty"
# Print information (this is ignored by patch)
echo diff/patch file created on "$(date)" with:
echo difftar-folder.sh "$@"
echo TARFILE= "$tarfile"
echo FOLDER= "$folder"
echo TARSTRIP= "$strip"
echo TARPREFIX= "$prefix"
echo ORIGFOLDER= "$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
if [ -d "$new" ] ; then
diff -u -r --unidirectional-new-file "$empty" "$new"
fi
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