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 DEBIAN
virt-tar-in
virt-tar-in(1) Virtualization Support virt-tar-in(1)
NAME
virt-tar-in - Unpack a tarball into a virtual machine disk image.
SYNOPSIS
virt-tar-in -a disk.img data.tar /destination
virt-tar-in -d domain data.tar /destination
zcat data.tar.gz | virt-tar-in -d domain - /destination
WARNING
Using "virt-tar-in" on live virtual machines can be dangerous, potentially causing disk corruption. The virtual machine must be shut down
before you use this command.
DESCRIPTION
"virt-tar-in" unpacks an uncompressed tarball into a virtual machine disk image or named libvirt domain.
The first parameter is the tar file. Use "-" to read the tar file from standard input. The second parameter is the absolute target
directory to unpack into.
EXAMPLES
Upload a home directory to a guest:
virt-tar-in -d MyGuest homes.tar /home
JUST A SHELL SCRIPT WRAPPER AROUND GUESTFISH
This command is just a simple shell script wrapper around the guestfish(1) "tar-in" command. For anything more complex than a trivial
copy, you are probably better off using guestfish directly.
OPTIONS
Since the shell script just passes options straight to guestfish, read guestfish(1) to see the full list of options.
SEE ALSO
guestfish(1), virt-cat(1), virt-copy-in(1), virt-copy-out(1), virt-edit(1), virt-make-fs(1), virt-tar-out(1), <http://libguestfs.org/>.
AUTHORS
Richard W.M. Jones ("rjones at redhat dot com")
COPYRIGHT
Copyright (C) 2011 Red Hat Inc. <http://libguestfs.org/>
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
libguestfs-1.18.1 2013-12-07 virt-tar-in(1)