https://github.com/trinitronx/tar-test

A test case for a tricky Bash tar extraction problem.
https://github.com/trinitronx/tar-test

Last synced: over 1 year ago
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A test case for a tricky Bash tar extraction problem.

• Host: GitHub
• URL: https://github.com/trinitronx/tar-test
• Owner: trinitronx
• Created: 2012-03-16T16:39:58.000Z (about 14 years ago)
• Default Branch: master
• Last Pushed: 2012-03-16T17:12:01.000Z (about 14 years ago)
• Last Synced: 2025-01-10T07:47:11.772Z (over 1 year ago)
• Language: Shell
• Homepage:
• Size: 97.7 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.markdown

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README

          
Tar extraction problem

======================

Overview

--------

When extracting different types of tar archives into a target directory,

we ran into troubles depending on the version of Bash that we were using.

In particular, these were the target platforms to support:

	$ lsb_release -a

	LSB Version:	:core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch

	Distributor ID:	CentOS

	Description:	CentOS release 5.7 (Final)

	Release:	5.7

	Codename:	Final

	

	$ bash --version

    GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu)

    Copyright (C) 2005 Free Software Foundation, Inc.

    ### AND...

	$ lsb_release -a

	Distributor ID:	Ubuntu

	Description:	Ubuntu 10.04.4 LTS

	Release:	10.04

	Codename:	lucid

	

    $ bash --version

	GNU bash, version 4.1.5(1)-release (i486-pc-linux-gnu)

	Copyright (C) 2009 Free Software Foundation, Inc.

	License GPLv3+: GNU GPL version 3 or later 

The problem: 

------------

Extract an archive into a target directory (ie: htdocs)

with the following constraints:

 - Extract directly into the target dir while overwriting files

 - Extract only a selected directory from the archive while supporting:

   - Single top-level directory

   - "tar-bombs" (archives with no top-level dir)

   - Archives where target files reside in multiple top-level dirs

     - with spaces OR

	 - without spaces

   - Archives where selected directory can be selected by wildcards

 - Extraction must work on both target versions of Bash (above)

The main issue is that most solutions for 'multiple dirs with spaces'

and the 'tar-bomb' style (dir-to-extract=NULL) are mutually exclusive 

with one another across Bash versions.