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Top Forums UNIX for Advanced & Expert Users Size of a tarball without untarring - Catch parent tar ball has sub tars Post 302511466 by Perderabo on Wednesday 6th of April 2011 10:27:49 PM
Old 04-06-2011
There is nothing very odd about the results you describe. If you take 3 files each one megabyte of text and tar them into child.tar you have a roughly 3 megabyte tar file. Now you compress it and get, say a 25 kilobyte child.tar.gz. Now you create a parent.tar which is about 25 kb. If you ry to compress data which is mostly compressed, it won't compress much if at all. So now maybe parent.tar.gz is 24 kb. This is exactly the situation that you disbelieve. parent.tar.gz will expand back to 25 kb. But the child.tar.gz inside it will expand back to 3 MB.
 

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Arch::Tarball(3pm)					User Contributed Perl Documentation					Arch::Tarball(3pm)

NAME
Arch::Tarball - an interface to create and work with tarballs SYNOPSIS
use Arch::Tarball my $tarball = Arch::Tarball->new; my $pipe = $tarball->create( dir => '/path/to/subdir-to-pack', base_name => 'new-subdir-to-pack', pipe => 1, ); DESCRIPTION
Arch::Tarball provides an object oriented interface to work with (create, examine or extract) standard gzipped tarballs. Note: As functionality is added only when needed, a lot of features are currently not implemented. METHODS
The following functions are available: new, create, extract, list. new %opts Creates a new Arch::Tarball object. The following parameters can be set via %opts: tar The name of the tar executable. Defaults to "tar". file The filename of the Tarball. create %opts Creates a new tarball (tar.gz) from a given directory structure. create understands the following options: dir (mandatory) Specifies the base directory for the tarball. The given directory and recursively its content will be added to the tarball. The directory's basename will be used as the first and the only subdirectory in the tarball. base_name Allow the programmer to specify a different base directory name for the tarball content than the basename of dir. In this case, 'cp' process is launched to temporarily rename the last element of dir. pipe When set, create does not create a physical tarball but writes the tarballs content to a newly created pipe. The pipe is returned by the create method. Note: Currently the pipe option is mandatory. extract %opts Extracts the tarball to a given target directory, specified by dir option. If dir option is not given, a temporary directory is created that will hold the extracted dirs/files. This directory is returned. The file option specifies the tarball file name. It may be given in the constructor instead. list %opts (not implemented yet) Returns a list of files and directories in the tarball. BUGS
Most functionality is currently not implemented. If you need part of the missing functionality, please contact the authors. Patches are greatly appreciated. AUTHORS
Mikhael Goikhman (migo@homemail.com--Perl-GPL/arch-perl--devel). Enno Cramer (uebergeek@web.de--2003/arch-perl--devel). perl v5.10.1 2005-04-22 Arch::Tarball(3pm)
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