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Datei: difftar-folder.sh Sprache: Shell

Original von: Coq^©

#!/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 [strip]'
  echo ' is the name of the tar file do diff with (required)'
  echo ' is the name of the folder to diff with (required)'
  echo ' 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 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 the 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

¤ Dauer der Verarbeitung: 0.16 Sekunden (vorverarbeitet) ¤

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