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bdf7a27a79
This script is just a simpler way to cat a file from a VM. It is otherwise equivalent to using guestfish. virt-cat someguest /etc/fstab virt-cat someguest /var/log/messages | tail
193 lines
4.5 KiB
Perl
Executable File
193 lines
4.5 KiB
Perl
Executable File
#!/usr/bin/perl -w
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# virt-cat
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# Copyright (C) 2009 Red Hat Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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use warnings;
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use strict;
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use Sys::Guestfs;
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use Sys::Guestfs::Lib qw(open_guest get_partitions resolve_windows_path
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inspect_all_partitions inspect_partition
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inspect_operating_systems mount_operating_system);
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use Pod::Usage;
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use Getopt::Long;
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use Data::Dumper;
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use File::Temp qw/tempdir/;
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use XML::Writer;
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use Locale::TextDomain 'libguestfs';
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=encoding utf8
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=head1 NAME
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virt-cat - Display a file in a virtual machine
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=head1 SYNOPSIS
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virt-cat [--options] domname file
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virt-cat [--options] disk.img [disk.img ...] file
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=head1 DESCRIPTION
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C<virt-cat> is a command line tool to display the contents of C<file>
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where C<file> exists in the named virtual machine (or disk image).
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C<virt-cat> can be used to quickly view a single file. For more
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complex cases you should look at the L<guestfish(1)> tool.
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=head1 EXAMPLES
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Display C</etc/fstab> file from inside the libvirt VM called
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C<mydomain>:
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virt-cat mydomain /etc/fstab
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List syslog messages from a VM:
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virt-cat mydomain /var/log/messages | tail
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Find out what packages were recently installed:
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virt-cat mydomain /var/log/yum.log | tail
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Find out who is logged on inside a virtual machine:
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virt-cat mydomain /var/run/utmp > /tmp/utmp
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who /tmp/utmp
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or who was logged on:
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virt-cat mydomain /var/log/wtmp > /tmp/wtmp
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last -f /tmp/wtmp
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=head1 OPTIONS
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=over 4
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=cut
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my $help;
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=item B<--help>
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Display brief help.
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=cut
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my $version;
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=item B<--version>
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Display version number and exit.
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=cut
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my $uri;
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=item B<--connect URI> | B<-c URI>
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If using libvirt, connect to the given I<URI>. If omitted, then we
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connect to the default libvirt hypervisor.
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If you specify guest block devices directly, then libvirt is not used
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at all.
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=back
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=cut
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GetOptions ("help|?" => \$help,
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"version" => \$version,
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"connect|c=s" => \$uri,
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) or pod2usage (2);
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pod2usage (1) if $help;
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if ($version) {
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my $g = Sys::Guestfs->new ();
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my %h = $g->version ();
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print "$h{major}.$h{minor}.$h{release}$h{extra}\n";
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exit
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}
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pod2usage (__"virt-cat: no image, VM names or filenames to cat given")
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if @ARGV <= 1;
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my $filename = pop @ARGV;
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my $g;
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if ($uri) {
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$g = open_guest (\@ARGV, address => $uri);
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} else {
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$g = open_guest (\@ARGV);
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}
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$g->launch ();
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$g->wait_ready ();
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# List of possible filesystems.
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my @partitions = get_partitions ($g);
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# Now query each one to build up a picture of what's in it.
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my %fses =
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inspect_all_partitions ($g, \@partitions,
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use_windows_registry => 0);
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my $oses = inspect_operating_systems ($g, \%fses);
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my @roots = keys %$oses;
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die __"no root device found in this operating system image" if @roots == 0;
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die __"multiboot operating systems are not supported by virt-cat" if @roots > 1;
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my $root_dev = $roots[0];
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my $os = $oses->{$root_dev};
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mount_operating_system ($g, $os);
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# Allow this to fail in case eg. the file does not exist.
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# NB: https://bugzilla.redhat.com/show_bug.cgi?id=501888
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print $g->download($filename, "/dev/stdout");
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=head1 SEE ALSO
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L<guestfs(3)>,
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L<guestfish(1)>,
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L<Sys::Guestfs(3)>,
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L<Sys::Guestfs::Lib(3)>,
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L<Sys::Virt(3)>,
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L<http://libguestfs.org/>.
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=head1 AUTHOR
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Richard W.M. Jones L<http://et.redhat.com/~rjones/>
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=head1 COPYRIGHT
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Copyright (C) 2009 Red Hat Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
|
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|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
|
|
|
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You should have received a copy of the GNU General Public License
|
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along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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