manage_dataset.in 18.8 KB
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#!/usr/bin/perl -w
#
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# Copyright (c) 2000-2015 University of Utah and the Flux Group.
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# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file 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 Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
#
use English;
use strict;
use Getopt::Std;
use Data::Dumper;
use POSIX ":sys_wait_h";
use POSIX qw(setsid close);
use Date::Parse;

#
# Back-end script to manage APT profiles.
#
sub usage()
{
    print STDERR "Usage: manage_dataset [options --] create ...\n";
    print STDERR "Usage: manage_dataset [options --] delete ...\n";
    print STDERR "Usage: manage_dataset [options --] refresh ...\n";
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    print STDERR "Usage: manage_dataset [options --] modify ...\n";
    print STDERR "Usage: manage_dataset [options --] extend ...\n";
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    print STDERR "Usage: manage_dataset [options --] snapshot ...\n";
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    exit(-1);
}
my $optlist     = "dt:";
my $debug       = 0;
my $webtask_id;
my $webtask;

#
# Configure variables
#
my $TB		= "@prefix@";
my $TBOPS       = "@TBOPSEMAIL@";

#
# Untaint the path
#
$ENV{'PATH'} = "$TB/bin:$TB/sbin:/bin:/usr/bin:/usr/bin:/usr/sbin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

#
# Turn off line buffering on output
#
$| = 1;

#
# Load the Testbed support stuff.
#
use lib "@prefix@/lib";
use libtestbed;
use EmulabConstants;
use emdb;
use emutil;
use User;
use Project;
use APT_Dataset;
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use APT_Instance;
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use WebTask;
use Blockstore;
use GeniResponse;
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use GeniXML;
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# Protos
sub fatal($);
sub DoCreate();
sub DoDelete();
sub DoRefresh();
sub DoRefreshInternal($$);
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sub DoModify();
sub DoExtend();
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sub DoSnapshot();
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sub DoSnapShotInternal($$$$$);
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sub PollDatasetStatus($$);
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#
# Parse command arguments. Once we return from getopts, all that should be
# left are the required arguments.
#
my %options = ();
if (grep {$_ eq "--"} @ARGV &&
    ! getopts($optlist, \%options)) {
    usage();
}
if (defined($options{"d"})) {
    $debug = 1;
}
if (defined($options{"t"})) {
    $webtask_id = $options{"t"};
}
if (@ARGV < 1) {
    usage();
}

# The web interface (and in the future the xmlrpc interface) sets this.
my $this_user = User->ImpliedUser();
if (! defined($this_user)) {
    $this_user = User->ThisUser();
    if (!defined($this_user)) {
	fatal("You ($UID) do not exist!");
    }
}
my $action = shift(@ARGV);

if ($action eq "create") {
    exit(DoCreate());
}
elsif ($action eq "delete") {
    exit(DoDelete());
}
elsif ($action eq "refresh") {
    exit(DoRefresh());
}
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elsif ($action eq "modify") {
    exit(DoModify());
}
elsif ($action eq "extend") {
    exit(DoExtend());
}
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elsif ($action eq "snapshot") {
    exit(DoSnapshot());
}
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else {
    usage();
}
exit(1);

#
# 
#
sub DoCreate()
{
    my $usage = sub {
	print STDERR "Usage: manage_dataset create ".
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	    "[-t type] [-f fstype] [-e expiration] [-a am_urn] ".
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	    "[-R global|project] [-W creator|project] ".
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	    "-s size pid/name\n";
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	exit(-1);
    };
    my $aggregate_urn = "urn:publicid:IDN+apt.emulab.net+authority+cm";
    my $errmsg;
    my $pid;
    my $expires;
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    my $size = 0;
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    my $type = "stdataset";
    my $fstype;
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    my $read_access;
    my $write_access;
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    # imdataset snapshot info.
    my ($instance,$nodeid,$bsname);
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    my $optlist = "ds:t:e:f:w:p:R:W:I:i:";
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    my %options = ();
    if (! getopts($optlist, \%options)) {
	&$usage();
    }
    if (defined($options{"d"})) {
	$debug = 1;
    }
    if (defined($options{"t"})) {
	$type = $options{"t"};
	&$usage()
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	    if (! ($type eq "stdataset" || $type eq "ltdataset" ||
		   $type eq "imdataset"));
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    }
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    if ($type eq "imdataset") {
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	if (!exists($options{"i"})) {
	    print STDERR "Must provide -i opton for imdatasets\n";
	    &$usage();
	}
	if (!exists($options{"I"})) {
	    print STDERR "Must provide -I opton for imdatasets\n";
	    &$usage();
	}
	$instance = APT_Instance->Lookup($options{"i"});
	if (!defined($instance)) {
	    fatal("Instance does not exist!");
	}
	$aggregate_urn = $instance->aggregate_urn();
	
	($nodeid,$bsname) = split(",", $options{"I"});
	if (! (defined($nodeid) && defined($bsname))) {
	    print STDERR "Improper -I opton for imdatasets\n";
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	    &$usage();
	}
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    }
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    if (defined($options{"f"})) {
	$fstype = $options{"f"};
	&$usage()
	    if ($fstype !~ /^(ext2|ext3|ext4|ufs|ufs2)$/);
    }
    if (defined($options{"R"})) {
	$read_access = $options{"R"};
	&$usage()
	    if ($read_access !~ /^(global|project)$/);
    }
    if (defined($options{"W"})) {
	$write_access = $options{"W"};
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	&$usage()
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	    if ($write_access !~ /^(creator|project)$/);
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    }
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    if (defined($options{"s"})) {
	if ($options{"s"} =~ /^(\d+)$/) {
	    $size = $1;
	}
	elsif ($options{"s"} =~ /^(\d+)(\w+)$/) {
	    $size = Blockstore::ConvertToMebi($options{"s"});
	    if ($size < 0) {
		fatal("Could not parse size.");
	    }
	}
	else {
	    &$usage();
	}
    }
    if (defined($options{"e"})) {
	$expires = str2time($options{"e"});
	if (!defined($expires)) {
	    fatal("Could not parse expiration date.");
	}
	$expires = $options{"e"};
    }
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    &$usage()
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	if (@ARGV != 1 ||
	    ($type ne "imdataset" && !defined($size)) ||
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	    ($type eq "stdataset" && !defined($expires)));
    my $name = shift(@ARGV);

    if ($name =~ /^([-\w]+)\/([-\w]+)$/) {
	$pid  = $1;
	$name = $2;
    }
    else {
	fatal("Dataset name $name not in the form <pid>/<name>.");
    }
    my $project = Project->Lookup($pid);
    if (!defined($project)) {
	fatal("No such project");
    }
    if (!$project->AccessCheck($this_user, TB_PROJECT_CREATELEASE())) {
	fatal("Not enough permission in project");
    }
    &$usage()
	if ($type eq "stdataset" && !defined($expires));

    if (APT_Dataset->Lookup("$pid/$name")) {
	fatal("Dataset already exists!");
    }

    my $blob = {
	"dataset_id"     => $name,
	"pid"            => $project->pid(),
	"pid_idx"        => $project->pid_idx,
	"creator_uid"    => $this_user->uid(),
	"creator_idx"    => $this_user->uid_idx(),
	"aggregate_urn"  => $aggregate_urn,
	"type"           => $type,
	"size"           => $size,
    };
    $blob->{"fstype"} = $fstype
	if (defined($fstype));
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    $blob->{"expires"} = TBDateStringLocal($expires)
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	if (defined($expires));
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    $blob->{"read_access"} = $read_access
	if (defined($read_access));
    $blob->{"write_access"} = $write_access
	if (defined($write_access));
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    my $dataset = APT_Dataset->Create($blob);
    if (!defined($dataset)) {
	fatal("Internal error creating dataset object");
    }
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    # Now we can create.
    if (defined($webtask_id)) {
	$webtask = WebTask->Create($dataset->uuid(), $webtask_id);
	if (defined($webtask)) {
	    # Convenient.
	    $webtask->AutoStore(1);
	}
    }
    
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    # new dataset is returned locked. If we have instance, try to lock
    # that now, else its a failure.
    if ($type eq "imdataset" && defined($instance)) {
	if ($instance->Lock()) {
	    $errmsg = "Instance is busy, cannot snapshot data";
	    goto failed;
	}
    }
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    #
    # Ask the aggregate to create the dataset. 
    #
    my $response = $dataset->CreateDataset();
    if ($response->code() != GENIRESPONSE_SUCCESS) {
	$errmsg = "CreateDataset failed: ". $response->output() . "\n";
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	$instance->Unlock()
	    if (defined($instance));
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	goto failed;
    }
    $blob = $response->value();
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    $dataset->Update({"remote_uuid" => $blob->{"uuid"},
		      "remote_urn"  => $blob->{"urn"}});
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    #
    # Okay, this is silly; there is no distinct state for resource allocation.
    # It is unapproved and locked. The other side tells us its locked in the
    # blob (busy), so look for this and set the state to busy. Then we poll
    # waiting for the lease to go nonbusy and approved. Ick.
    #
    if ($blob->{"busy"}) {
	$dataset->Update({"state" => "busy"});
    }
    else {
	$dataset->Update({"state" => $blob->{"state"}});
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	if ($type ne "imdataset" || !defined($instance)) {
	    $dataset->Unlock();
	    return 0;
	}
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    }
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    #
    # Handoff to snapshot if an imdataset.
    #
    if ($type eq "imdataset" &&
	DoSnapShotInternal($dataset, $instance,
			   $bsname, $nodeid, \$errmsg)) {
	$instance->Unlock();
	goto failed;
    }
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    if (PollDatasetStatus($dataset, \$errmsg)) {
	# Exit and let child poll
	exit(0);
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    }
    $dataset->Unlock();
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    $instance->Unlock() if (defined($instance));
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    return 0;

  failed:
    $dataset->Delete()
	if (defined($dataset));
    # This will set the webtask, see below.
    fatal($errmsg);
}

#
# Delete
#
sub DoDelete()
{
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    my $errmsg = "Could not delete dataset";
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    if (@ARGV != 1) {
	fatal("usage: $0 delete pid/name");
    }
    my $token   = shift(@ARGV);
    my $dataset = APT_Dataset->Lookup($token);
    if (!defined($dataset)) {
	fatal("No such dataset");
    }
    if ($dataset->Lock()) {
	fatal("dataset is busy, cannot lock it");
    }
    my $response = $dataset->DeleteDataset();
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    if ($response->code() != GENIRESPONSE_SUCCESS &&
	$response->code() != GENIRESPONSE_SEARCHFAILED) {
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	$errmsg = "DeleteDataset failed: ". $response->output() . "\n";
	goto failed;
    }
    $dataset->Delete();
    return 0;

  failed:
    $dataset->Unlock();
    # This will set the webtask, see below.
    fatal($errmsg);
}

#
# Refresh
#
sub DoRefresh()
{
    my $errmsg;
    
    if (@ARGV != 1) {
	fatal("usage: $0 refresh pid/name");
    }
    my $token   = shift(@ARGV);
    my $dataset = APT_Dataset->Lookup($token);
    if (!defined($dataset)) {
	fatal("No such dataset");
    }
    if ($dataset->Lock()) {
	fatal("dataset is busy, cannot lock it");
    }
    if (DoRefreshInternal($dataset, \$errmsg)) {
	goto failed;
    }
    $dataset->Unlock();
    return 0;

  failed:
    $dataset->Unlock();
    # This will set the webtask, see below.
    fatal($errmsg);
}

sub DoRefreshInternal($$)
{
    my ($dataset, $pmesg) = @_;
    
    my $response = $dataset->DescribeDataset();
    if ($response->code() != GENIRESPONSE_SUCCESS) {
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	if ($response->code() == GENIRESPONSE_SEARCHFAILED) {
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	    $$pmesg = "Dataset no longer exists at the target\n";
	}
	else {
	    $$pmesg = "DescribeDataset failed: ". $response->output() . "\n";
	}
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	return -1;
    }
    my $blob = $response->value();
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    print STDERR Dumper($blob);
    
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    $dataset->Update({"last_used" => TBDateStringLocal($blob->{"lastused"}),
		      "expires"   => TBDateStringLocal($blob->{"expires"})});

    if ($blob->{"busy"}) {
	$dataset->Update({"state" => "busy"});
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	if ($dataset->type() eq "imdataset") {
	    if (defined($webtask)) {
		$webtask->image_size($blob->{'image_size'}) 	
		    if (exists($blob->{'image_size'}));
		$webtask->image_status($blob->{'image_status'})
		    if (exists($blob->{'image_status'}));
	    }
	}
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    }
    else {
	$dataset->Update({"state" => $blob->{"state"}});
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	if ($dataset->type() eq "imdataset") {
	    $dataset->Update({"size" => $blob->{"size"}});
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	    if (defined($webtask)) {
		$webtask->image_size($blob->{'image_size'}) 	
		    if (exists($blob->{'image_size'}));
		$webtask->image_status($blob->{'image_status'})
		    if (exists($blob->{'image_status'}));
	    }
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	}
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    }
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    return 0;
}

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#
# Modify
#
sub DoModify()
{
    my $errmsg;
    
    my $usage = sub {
	print STDERR "Usage: manage_dataset modify ".
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	    "[-R global|project] [-W creator|project] pid/name\n";
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	exit(-1);
    };
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    my $optlist = "R:W:";
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    my %options = ();
    if (! getopts($optlist, \%options)) {
	&$usage();
    }
    if (@ARGV != 1) {
	&$usage();
    }
    my $token   = shift(@ARGV);
    my $dataset = APT_Dataset->Lookup($token);
    if (!defined($dataset)) {
	fatal("No such dataset");
    }
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    my $blob = {};
    if (defined($options{"R"})) {
	my $read_access = $options{"R"};
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	&$usage()
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	    if ($read_access !~ /^(global|project)$/);
	$blob->{'read_access'} = $read_access;
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    }
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    if (defined($options{"W"})) {
	my $write_access = $options{"W"};
	&$usage()
	    if ($write_access !~ /^(creator|project)$/);
	$blob->{'write_access'} = $write_access;
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    }
    if ($dataset->Lock()) {
	fatal("dataset is busy, cannot lock it");
    }
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    if (keys(%$blob)) {
	if ($dataset->Update($blob)) {
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	    $errmsg = "Could not update privacy settings!";
	    goto failed;
	}
    }
    my $response = $dataset->ModifyDataset();
    if ($response->code() != GENIRESPONSE_SUCCESS) {
	if ($response->code() == GENIRESPONSE_SEARCHFAILED) {
	    $errmsg = "Dataset no longer exists at the target\n";
	}
	else {
	    $errmsg = "ModifyDataset failed: ". $response->output() . "\n";
	}
	goto failed;
    }
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    $blob = $response->value();
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    if ($dataset->type() ne "imdataset") {
	$dataset->Update({"expires" => TBDateStringLocal($blob->{"expires"})});
    }
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    $dataset->Unlock();
    return 0;

  failed:
    $dataset->Unlock();
    # This will set the webtask, see below.
    fatal($errmsg);
}

#
# Extend
#
sub DoExtend()
{
    my $errmsg;
    
    my $usage = sub {
	print STDERR "Usage: manage_dataset extend pid/name\n";
	exit(-1);
    };
    if (@ARGV != 1) {
	&$usage();
    }
    my $token   = shift(@ARGV);
    my $dataset = APT_Dataset->Lookup($token);
    if (!defined($dataset)) {
	fatal("No such dataset");
    }
    if ($dataset->Lock()) {
	fatal("dataset is busy, cannot lock it");
    }
    my $response = $dataset->ExtendDataset();
    if ($response->code() != GENIRESPONSE_SUCCESS) {
	if ($response->code() == GENIRESPONSE_SEARCHFAILED) {
	    $errmsg = "Dataset no longer exists at the target\n";
	}
	else {
	    $errmsg = "ExtendDataset failed: ". $response->output() . "\n";
	}
	goto failed;
    }
    my $blob = $response->value();
    $dataset->Update({"expires" => TBDateStringLocal($blob->{"expires"})});
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    if (exists($blob->{'state'})) {
	$dataset->Update({"state" => $blob->{'state'}});
    }
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    $dataset->Unlock();
    return 0;

  failed:
    $dataset->Unlock();
    # This will set the webtask, see below.
    fatal($errmsg);
}

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#
# Snapshot an image backed dataset
#
sub DoSnapshot()
{
    my $errmsg;
    
    my $usage = sub {
	print STDERR "Usage: manage_dataset snapshot ".
	    "-i instance -b bsname pid/name nodeid\n";
	exit(-1);
    };
    my $optlist = "b:i:";
    my %options = ();
    if (! getopts($optlist, \%options)) {
	&$usage();
    }
    &$usage()
	if (! (@ARGV == 2 && exists($options{"b"}) && exists($options{"i"})));
    
    my $bsname  = $options{"b"};
    my $token   = shift(@ARGV);
    my $nodeid  = shift(@ARGV);
    my $dataset = APT_Dataset->Lookup($token);
    if (!defined($dataset)) {
	fatal("No such dataset");
    }
    if ($dataset->type() ne "imdataset") {
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	fatal("Only image backed datasets supported");
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    }
    my $instance = APT_Instance->Lookup($options{"i"});
    if (!defined($instance)) {
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	fatal("No such instance");
    }
    if ($dataset->Lock()) {
	fatal("dataset is busy, cannot lock it");
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    }
    if ($instance->Lock()) {
	# undef so we do not try to unlock it below.
	$instance = undef;
	$errmsg = "instance is busy, cannot lock it";
	goto failed
    }
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    # Create a webtask for the caller, might be ignored but thats okay.
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    $webtask = WebTask->Create($dataset->uuid(), $webtask_id);
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    if (defined($webtask)) {
	# Convenient.
	$webtask->AutoStore(1);
    }
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    if (DoSnapShotInternal($dataset, $instance, $bsname, $nodeid, \$errmsg)) {
	goto failed;
    }
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    if (PollDatasetStatus($dataset, \$errmsg)) {
	# Exit and let child poll
	exit(0);
    }
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    $instance->Unlock();
    $dataset->Unlock();
    return 0;
    
  failed:
    $instance->Unlock() if (defined($instance));
    $dataset->Unlock();
    # This will set the webtask, see below.
    fatal($errmsg);
}

sub DoSnapShotInternal($$$$$)
{
    my ($dataset, $instance, $bsname, $nodeid, $perrmsg) = @_;
    my $errmsg;
    
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    my $manifest = GeniXML::Parse($instance->manifest());
    if (! defined($manifest)) {
	$errmsg = "Could not parse manifest";
	goto failed;
    }
    my $sliver_urn;
    my @nodes = GeniXML::FindNodes("n:node", $manifest)->get_nodelist();
    foreach my $node (@nodes) {
	my $client_id = GeniXML::GetVirtualId($node);
	if ($nodeid eq $client_id) {
	    $sliver_urn = GeniXML::GetSliverId($node);
	    #
	    # But check that the bsname is on this node.
	    #
	    my $found = 0;
	    foreach my $blockref
		(GeniXML::FindNodesNS("n:blockstore", $node,
				      $GeniXML::EMULAB_NS)->get_nodelist()) {
		    my $name = GeniXML::GetText("name", $blockref);
		    if ($name eq $bsname) {
			$found = 1;
			last;
		    }
	    }
	    if (!$found) {
		$errmsg = "No such blockstore $bsname on node $nodeid";
		goto failed;
	    }
	    last;
	}
    }
    if (!defined($sliver_urn)) {
	$errmsg = "Could not find node '$nodeid' in manifest";
	goto failed;
    }
    my $response = $instance->CreateImage($sliver_urn,
					  $dataset->dataset_id(), $bsname);
    if ($response->code() != GENIRESPONSE_SUCCESS) {
	$errmsg = "SnapshotDataset failed: ". $response->output() . "\n";
	goto failed;
    }
    $dataset->Update({"state" => "busy"});
    return 0;
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  failed:
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    $$perrmsg = $errmsg;
    return -1;
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}
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#
# Poll for snapshot status.
#
sub PollDatasetStatus($$)
{
    my ($dataset, $perrmsg) = @_;
    my $project = $dataset->GetProject();
    my $dname   = $dataset->dataset_id();
    my $logfile;

    #
    # If busy, then allocation is in progress. We leave it locked and
    # poll in the background for a while, hoping for it to eventually
    # stop being busy. Eventually might have to replace this, since
    # polling got any non-small length of time will lead to trouble.
    #
    if (! $debug) {
        $logfile = TBMakeLogname("createdataset");

	if (my $childpid = TBBackGround($logfile)) {
	    return $childpid;
	}
	# Let parent exit;
	sleep(2);
    }
    $webtask->SetProcessID($PID)
	if (defined($webtask));

    my $seconds  = 1200;
    my $interval = 5;
    
    while ($seconds > 0) {
	$seconds -= $interval;
	if (DoRefreshInternal($dataset, $perrmsg)) {
	    print STDERR $$perrmsg;
	    sleep($interval);
	    next;
	}
	if ($dataset->state() eq "valid") {
	    $project->SendEmail($this_user->email(),
			"Your dataset is now ready to use",
			"Dataset '$dname' is now allocated and ready to use.\n",
				$project->OpsEmailAddress(), undef, $logfile);
	    $webtask->Exited(0)
		if (defined($webtask));
	    last;
	}
	sleep($interval);
    }
    $webtask->Exited(-1)
	if (defined($webtask) && $seconds <= 0);
    
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    unlink($logfile)
	if (defined($logfile));
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    return 0;
}

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sub fatal($)
{
    my ($mesg) = @_;

    if (defined($webtask)) {
	$webtask->output($mesg);
	$webtask->Exited(-1);
    }
    print STDERR "*** $0:\n".
	         "    $mesg\n";
    # Exit with negative status so web interface treats it as system error.
    exit(-1);
}

sub escapeshellarg($)
{
    my ($str) = @_;

    $str =~ s/[^[:alnum:]]/\\$&/g;
    return $str;
}