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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LEARN ABOUT SUSE
git-tar-tree
GIT-TAR-TREE(1) Git Manual GIT-TAR-TREE(1)
NAME
git-tar-tree - Create a tar archive of the files in the named tree object
SYNOPSIS
git tar-tree [--remote=<repo>] <tree-ish> [ <base> ]
DESCRIPTION
THIS COMMAND IS DEPRECATED. Use git archive with --format=tar option instead (and move the <base> argument to --prefix=base/).
Creates a tar archive containing the tree structure for the named tree. When <base> is specified it is added as a leading path to the files
in the generated tar archive.
git tar-tree behaves differently when given a tree ID versus when given a commit ID or tag ID. In the first case the current time is used
as modification time of each file in the archive. In the latter case the commit time as recorded in the referenced commit object is used
instead. Additionally the commit ID is stored in a global extended pax header. It can be extracted using git get-tar-commit-id.
OPTIONS
<tree-ish>
The tree or commit to produce tar archive for. If it is the object name of a commit object.
<base>
Leading path to the files in the resulting tar archive.
--remote=<repo>
Instead of making a tar archive from local repository, retrieve a tar archive from a remote repository.
CONFIGURATION
tar.umask
This variable can be used to restrict the permission bits of tar archive entries. The default is 0002, which turns off the world write
bit. The special value "user" indicates that the archiving user's umask will be used instead. See umask(2) for details.
EXAMPLES
git tar-tree HEAD junk | (cd /var/tmp/ && tar xf -)
Create a tar archive that contains the contents of the latest commit on the current branch, and extracts it in /var/tmp/junk directory.
git tar-tree v1.4.0 git-1.4.0 | gzip >git-1.4.0.tar.gz
Create a tarball for v1.4.0 release.
git tar-tree v1.4.0^{tree} git-1.4.0 | gzip >git-1.4.0.tar.gz
Create a tarball for v1.4.0 release, but without a global extended pax header.
git tar-tree --remote=example.com:git.git v1.4.0 >git-1.4.0.tar
Get a tarball v1.4.0 from example.com.
git tar-tree HEAD:Documentation/ git-docs > git-1.4.0-docs.tar
Put everything in the current head's Documentation/ directory into git-1.4.0-docs.tar, with the prefix git-docs/.
AUTHOR
Written by Rene Scharfe.
DOCUMENTATION
Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org[1]>.
GIT
Part of the git(1) suite
NOTES
1. git@vger.kernel.org
mailto:git@vger.kernel.org
Git 1.7.1 07/05/2010 GIT-TAR-TREE(1)