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#!/usr/bin/perl -w
# virt-rescue
# Copyright (C) 2009 Red Hat Inc.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
use warnings;
use strict;
use Sys::Guestfs;
use Sys::Guestfs::Lib qw(open_guest);
use Pod::Usage;
use Getopt::Long;
use Locale::TextDomain 'libguestfs';
=encoding utf8
=head1 NAME
virt-rescue - Run a rescue shell on a virtual machine
=head1 SYNOPSIS
virt-rescue [--options] domname
virt-rescue [--options] disk.img [disk.img ...]
=head1 DESCRIPTION
virt-rescue gives you a rescue shell and some simple recovery tools
which you can use on a virtual machine disk image.
After running virt-rescue, what you see under C</> is the recovery
appliance. You must mount the virtual machine's filesystems by hand,
eg:
# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lv_root vg_f11x64 -wi-a- 8.83G
lv_swap vg_f11x64 -wi-a- 992.00M
# mount /dev/vg_f11x64/lv_root /sysroot
# ls /sysroot
B<Note> that the virtual machine must not be powered on when you use
this tool. Doing so will probably result in disk corruption in the
VM. However if you use the I<--ro> (read only) option, then you can
attach a shell to a running machine, but the results might be strange
or inconsistent.
This tool is just designed for quick interactive hacking on a virtual
machine. For more structured access to a virtual machine disk image,
you should use L<guestfs(3)>. To get a structured shell, use
L<guestfish(1)>.
=head1 OPTIONS
=over 4
=cut
my $help;
=item B<--help>
Display brief help.
=cut
my $version;
=item B<--version>
Display version number and exit.
=cut
my $uri;
=item B<--connect URI> | B<-c URI>
If using libvirt, connect to the given I<URI>. If omitted, then we
connect to the default libvirt hypervisor.
If you specify guest block devices directly, then libvirt is not used
at all.
=cut
my $readonly;
=item B<--ro> | B<-r>
Open the image read-only.
=back
=cut
GetOptions ("help|?" => \$help,
"version" => \$version,
"connect|c=s" => \$uri,
"ro|r" => \$readonly,
) or pod2usage (2);
pod2usage (1) if $help;
if ($version) {
my $g = Sys::Guestfs->new ();
my %h = $g->version ();
print "$h{major}.$h{minor}.$h{release}$h{extra}\n";
exit
}
pod2usage (__"virt-rescue: no image or VM names rescue given")
if @ARGV == 0;
my @args = (\@ARGV);
push @args, address => $uri if $uri;
push @args, rw => 1 unless $readonly;
my $g = open_guest (@args);
$g->set_direct (1);
$g->set_append ("guestfs_rescue=1");
$g->launch ();
exit 0;
=head1 SEE ALSO
L<guestfs(3)>,
L<guestfish(1)>,
L<virt-cat(1)>,
L<Sys::Guestfs(3)>,
L<Sys::Guestfs::Lib(3)>,
L<Sys::Virt(3)>,
L<http://libguestfs.org/>.
=head1 AUTHOR
Richard W.M. Jones L<http://et.redhat.com/~rjones/>
=head1 COPYRIGHT
Copyright (C) 2009 Red Hat Inc.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
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