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detach.pl
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detach.pl
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#!/usr/bin/perl
#
# Copyright 2009-2012 Eucalyptus Systems, 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; version 3 of the License.
#
# 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, see http://www.gnu.org/licenses/.
#
# Please contact Eucalyptus Systems, Inc., 6755 Hollister Ave., Goleta
# CA 93117, USA or visit http://www.eucalyptus.com/licenses/ if you need
# additional information or have any questions.
#
# This file may incorporate work covered under the following copyright
# and permission notice:
#
# Software License Agreement (BSD License)
#
# Copyright (c) 2008, Regents of the University of California
# All rights reserved.
#
# Redistribution and use of this software in source and binary forms,
# with or without modification, are permitted provided that the
# following conditions are met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE. USERS OF THIS SOFTWARE ACKNOWLEDGE
# THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE LICENSED MATERIAL,
# COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS SOFTWARE,
# AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
# IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA,
# SANTA BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY,
# WHICH IN THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION,
# REPLACEMENT OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO
# IDENTIFIED, OR WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT
# NEEDED TO COMPLY WITH ANY SUCH LICENSES OR RIGHTS.
use POSIX;
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
$ENV{'PATH'}='/bin:/usr/bin:/sbin:/usr/sbin/';
my $rootwrap = untaint(shift @ARGV);
my $virsh = untaint(shift @ARGV);
my $instanceId = untaint(shift @ARGV);
my $localdev = untaint(shift @ARGV);
my $virshxmlfile = untaint(shift @ARGV);
my $distro = "GENERIC";
my $user = getuid();
$inputfail = 1;
$detachfail = 2;
#system("cp $virshxmlfile /tmp/wtf");
$distro = detect_distro();
print STDERR "DISTRO: $distro\n";
if ( ! -x "$rootwrap" ) {
print STDERR "ERROR: cannot find root wrapper '$rootwrap'\n";
exit $inputfail;
}
$rc = check_devexists($rootwrap, $virsh, $instanceId, $localdev);
if ($rc == 1) {
print STDERR "device to detach is not attached\n";
exit $inputfail;
}
if ($distro eq "GENERIC") {
# try both workarounds
if ( ! -f "$virshxmlfile" ) {
print STDERR "ERROR: cannot locate virsh XML file\n";
exit $inputfail;
}
$cmd = "$rootwrap $virsh detach-device $instanceId $virshxmlfile";
$rc = system($cmd);
if ($rc) {
print STDERR "ERROR: cmd failed '$cmd'\n";
$cmd = "sudo xm block-detach $instanceId $localdev";
$rc = system($cmd);
if ($rc) {
print STDERR "ERROR: cmd failed '$cmd'\n";
}
}
if ($rc) {
exit ($detachfail);
}
} elsif ($distro eq "DEBIAN") {
# do the debian magic
$cmd = "sudo xm block-detach $instanceId $localdev";
$rc = system($cmd);
if ($rc) {
print STDERR "ERROR: cmd failed '$cmd'\n";
exit ($detachfail);
}
} else {
print STDERR "ERROR: unknown distribution\n";
exit $inputfail;
}
for ($i=0; $i<5; $i++) {
$rc = check_devexists($rootwrap, $virsh, $instanceId, $localdev);
if ($rc == 1) {
exit(0);
}
sleep(1);
}
exit $detachfail;
sub check_devexists() {
my $rootwrap = untaint(shift @_);
my $virsh = untaint(shift @_);
my $instanceId = untaint(shift @_);
my $localdev = untaint(shift @_);
open(RFH, "$rootwrap $virsh dumpxml $instanceId|");
while(<RFH>) {
chomp;
my $line = $_;
if ($line =~ /target dev='$localdev'/) {
close(RFH);
return(0);
}
}
close(RFH);
return(1);
}
sub detect_distro() {
if ( -f "/etc/debian_version" ) {
return("DEBIAN");
} elsif ( -f "/etc/issue" ) {
open(FH, "/etc/issue");
while(<FH>) {
chomp;
my $line = $_;
if ($line =~ /CentOS/) {
close(FH);
return("GENERIC");
}
}
close(FH);
}
return("GENERIC");
}
sub untaint() {
my $str = shift;
if ($str =~ /^([ &:#-\@\w.]+)$/) {
$str = $1; #data is now untainted
} else {
$str = "";
}
return($str);
}