Image.pm.in 49.4 KB
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#!/usr/bin/perl -wT
#
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# Copyright (c) 2007-2014 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/>.
# 
# }}}
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#
package Image;

use strict;
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use Carp;
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use Exporter;
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use vars qw(@ISA @EXPORT $AUTOLOAD);
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@ISA    = "Exporter";
@EXPORT = qw ( );

# Must come after package declaration!
use libdb;
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use EmulabConstants;
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use libtestbed;
use English;
use Data::Dumper;
use overload ('""' => 'Stringify');

# Configure variables
my $TB		  = "@prefix@";
my $BOSSNODE      = "@BOSSNODE@";
my $CONTROL	  = "@USERNODE@";
my $TBOPS         = "@TBOPSEMAIL@";
my $TBAUDIT       = "@TBAUDITEMAIL@";
my $TBBASE        = "@TBBASE@";
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my $PGENISUPPORT  = @PROTOGENI_SUPPORT@;
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my $DOPROVENANCE  = @IMAGEPROVENANCE@;
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my $TBWWW         = "@TBWWW@";

# Cache of instances to avoid regenerating them.
my %images    = ();
my $debug      = 0;

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# Concat id/vers.
sub versid($)
{
    my ($self) = @_;

    return $self->imageid() . ":" . $self->version();
}

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# Little helper and debug function.
sub mysystem($)
{
    my ($command) = @_;

    print STDERR "Running '$command'\n"
	if ($debug);
    return system($command);
}

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sub BlessRow($$)
{
    my ($class, $row) = @_;
    
    my $self           = {};
    my $imageid        = $row->{"imageid"};
    $self->{'IMAGE'}   = $row;

    bless($self, $class);
    return $self;
}

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#
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# Lookup by idx or pid,imagename[:version] depending on the args. We always 
# return highest numbered version on this path, if no version specified.
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#
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sub Lookup($$;$$)
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{
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    my ($class, $arg1, $arg2, $arg3) = @_;
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    #
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    # A single arg is either an index or "pid,imagename[:version]" or
    # "pid/imagename[:version]" string.
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    #
    if (!defined($arg2)) {
	if ($arg1 =~ /^(\d*)$/) {
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	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid and v.version=i.version ".
			    "where i.imageid='$arg1'");
	    return undef
		if (! $result || !$result->numrows);

	    return BlessRow($class, $result->fetchrow_hashref());
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	}
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	elsif ($arg1 =~ /^(\d*):(\d*)$/) {
	    $arg1 = $1;
	    $arg2 = $2;
	    goto versid;
	}
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	elsif ($arg1 =~ /^([-\w]*),([-\w\.\+]*)$/ ||
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		$arg1 =~ /^([-\w]*)\/([-\w\.\+]*)$/) {
	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid and v.version=i.version ".
			    "where i.pid='$1' and i.imagename='$2'");
	    return undef
		if (! $result || !$result->numrows);

	    return BlessRow($class, $result->fetchrow_hashref());
	}
	elsif ($arg1 =~ /^([-\w]*),([-\w\.\+]*):(\d*)$/ ||
		$arg1 =~ /^([-\w]*)\/([-\w\.\+]*):(\d*)$/) {
	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid ".
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			    "where i.pid='$1' and i.imagename='$2' and ".
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			    "      v.version='$3'");
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	    return undef
		if (!$result || !$result->numrows);

	    return BlessRow($class, $result->fetchrow_hashref())
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	}
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	elsif ($arg1 =~ /^\w+\-\w+\-\w+\-\w+\-\w+$/) {
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	    #
	    # First look to see if the uuid is for the image itself,
	    # which means current version. Otherwise look for a
	    # version with the uuid.
	    #
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	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid and v.version=i.version ".
			    "where i.uuid='$arg1'");
	    return undef
		if (!$result);
	    return BlessRow($class, $result->fetchrow_hashref())
		if ($result->numrows);
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	    $result =
		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from image_versions as v ".
			    "left join images as i on ".
			    "     v.imageid=i.imageid ".
			    "where v.uuid='$arg1' and ".
			    "      v.deleted is null");
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	    return undef
		if (! $result || !$result->numrows);

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	    return BlessRow($class, $result->fetchrow_hashref());
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	}
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	return undef;
    }
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    elsif (!defined($arg3)) {
	if ($arg1 =~ /^\d+$/ && $arg2 =~ /^\d+$/) {
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	  versid:
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	    #
	    # This will get deleted images, but that is okay.
	    #
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	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
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			    "  from image_versions as v ".
			    "left join images as i on ".
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			    "     v.imageid=i.imageid ".
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			    "where v.imageid='$arg1' and v.version='$arg2'");
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	    return undef
		if (! $result || !$result->numrows);
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	    return BlessRow($class, $result->fetchrow_hashref());
	}
	elsif ($arg1 =~ /^[-\w]*$/ && $arg2 =~ /^([-\w\.\+]*):(\d+)$/) {
	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid ".
			    "where i.pid='$arg1' and i.imagename='$1' and ".
			    "      v.version='$2'");
	    return undef
		if (! $result || !$result->numrows);
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	    return BlessRow($class, $result->fetchrow_hashref());
	}
	elsif ($arg1 =~ /^[-\w]*$/ && $arg2 =~ /^[-\w\.\+]*$/) {
	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid and v.version=i.version ".
			    "where i.pid='$arg1' and i.imagename='$arg2'");
	    return undef
		if (! $result || !$result->numrows);
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	    return BlessRow($class, $result->fetchrow_hashref());
	}
	return undef;
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    }
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    else {
	if ($arg1 =~ /^[-\w]*$/ &&
	    $arg2 =~ /^[-\w\.\+]*$/ && $arg3 =~ /^\d+$/) {
	    my $result =
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		DBQueryWarn("select i.*,v.*,i.uuid as image_uuid ".
			    "  from images as i ".
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			    "left join image_versions as v on ".
			    "     v.imageid=i.imageid ".
			    "where i.pid='$arg1' and i.imagename='$arg2' and ".
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			    "      v.version='$arg3'");
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	    return undef
		if (!$result || !$result->numrows);
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	    return BlessRow($class, $result->fetchrow_hashref());
	}
    }
    return undef;
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}
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AUTOLOAD {
    my $self  = $_[0];
    my $type  = ref($self) or croak "$self is not an object";
    my $name  = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    # A DB row proxy method call.
    if (exists($self->{'IMAGE'}->{$name})) {
	return $self->{'IMAGE'}->{$name};
    }
    carp("No such slot '$name' field in class $type");
    return undef;
}

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{'IMAGE'} = undef;
}

#
# Lookup by URL.
#
sub LookupByURL($$)
{
    my ($class, $url) = @_;

    return undef
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	if (! ($url =~ /^(ftp|http|https):/));
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    my $safe_url = DBQuoteSpecial($url);
    
    my $query_result =
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	DBQueryWarn("select pid,imagename from image_versions ".
		    "where metadata_url=$safe_url and deleted is null");
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    return undef
	if (!$query_result || !$query_result->numrows);

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    my ($pid,$imagename) = $query_result->fetchrow_array();
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    # Want latest version.
    return Image->Lookup($pid, $imagename);
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}
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#
# Lookup a "system" osid, meaning one in the emulab-ops project.
#
sub LookupByName($$)
{
    my ($class, $imagename) = @_;

    return Image->Lookup(TBOPSPID(), $imagename);
}

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#
# Get a list of all running frisbee images.
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# XXX if this is actually used, it will have to be fixed; DB no longer
# tracks running frisbee daemons.
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#
sub ActiveImages($)
{
    my ($class) = @_;
    my @result  = ();

    my $query_result =
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	DBQueryWarn("select imageid,imageid_version from frisbee_blobs ".
		    "where frisbee_pid!=0");
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    return undef
	if (!defined($query_result));

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    while (my ($imageid,$version) = $query_result->fetchrow_array()) {
	my $image = Image->Lookup($imageid, $version);
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	if (!defined($image)) {
	    print STDERR "*** Could not find DB object for image $imageid\n";
	    return undef;
	}
	push(@result, $image);
    }
    return \@result;
}

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#
# Return a list of all images of the given format for the given pid.
# If format is NULL, return all formats. If pid is NULL, return for all pids.
# List is names of the form "pid/imagename".
#
sub ListAll($$$)
{
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    my ($class, $format, $pid) = @_;
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    my @result = ();

    my $clause = "";
    if (defined($format) && $format =~ /^([-\w]+)$/) {
	$clause .= ($clause ? " and" : "where");
	$clause .= " format='$1'";
    }
    if (defined($pid) && $pid =~ /^([-\w]+)$/) {
	$clause .= ($clause ? " and" : "where");
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	$clause .= " i.pid='$1'";
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    }

    my $query_result =
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	DBQueryWarn("select distinct i.pid,i.imagename from images as i ".
		    "left join image_versions as v on ".
		    "     v.imageid=i.imageid and v.version=i.version ".
		    "$clause order by i.pid,i.imagename");
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    if ($query_result) {
	while (my ($pid,$name) = $query_result->fetchrow_array()) {
	    push(@result, "$pid/$name");
	}
    }
    return @result;
}

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#
# Refresh a class instance by reloading from the DB.
#
sub Refresh($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));

    my $imageid = $self->imageid();
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    my $version = $self->version();
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    my $query_result =
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	DBQueryWarn("select v.*,i.uuid as image_uuid ".
		    "  from image_versions as v ".
		    "left join images as i on ".
		    "     v.imageid=i.imageid ".
		    "where v.imageid='$imageid' and v.version='$version'");
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    return -1
	if (!$query_result || !$query_result->numrows);

    $self->{'IMAGE'} = $query_result->fetchrow_hashref();

    return 0;
}

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#
# Create a new os_info. This installs the new record in the DB,
# and returns an instance. There is some bookkeeping along the way.
#
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sub Create($$$$$$$$)
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{
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    my ($class, $project, $group, $creator,
	$imagename, $imageid, $argref, $usrerr_ref) = @_;
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    require OSinfo;
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    return undef
	if (ref($class) || !ref($project));

    my $isadmin = $creator->IsAdmin();

    # We may ignore particular partN_osid's by deleting them.
    my @arg_slots = grep(/^part[1-4]_osid$/, keys(%{$argref}));

    # Pass-through a bunch of required slots, ignoring any extras
    # and stuff we handle explicitly.
    foreach my $key ("loadpart", "loadlength", "default_osid") {
	if (!exists($argref->{$key})) {
	    $$usrerr_ref = "Error: $key missing in Image->Create!";
	    return undef;
	}
	push(@arg_slots, $key);
    }
    # Pass-through optional slots, otherwise the DB default is used.
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    foreach my $key ("path", "shared", "global", "ezid", "mbr_version",
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		     "metadata_url", "imagefile_url", "released") {
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	if (exists($argref->{$key})) {
	    push(@arg_slots, $key);
	}
    }

    my $pid     = $project->pid();
    my $pid_idx = $project->pid_idx();
    my $gid     = $group->gid();
    my $gid_idx = $group->gid_idx();
    my $uid     = $creator->uid();
    my $uid_idx = $creator->uid_idx();

    #
    # The pid/imageid has to be unique, so lock the table for the check/insert.
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    # We lock the os_info tables too, for the call into Lookup.
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    #
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    DBQueryWarn("lock tables images write, image_versions write, ".
		"            os_info as o read, os_info_versions as v read, ".
		"            emulab_indicies write")
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	or return undef;

    my $query_result =
	DBQueryWarn("select imagename from images ".
		    "where pid_idx='$pid_idx' and imagename='$imagename'");

    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	$$usrerr_ref = "Error: IMAGE $imagename in project $pid already exists!";
	return undef;
    }
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    # The metadata_url also has to be unique.
    if (exists($argref->{'metadata_url'})) {
	my $metadata_url = $argref->{'metadata_url'};
	my $safe_url = DBQuoteSpecial($metadata_url);
	
	my $query_result =
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	    DBQueryWarn("select imagename from image_versions ".
			"where metadata_url=$safe_url and deleted is null");
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	if ($query_result->numrows) {
	    DBQueryWarn("unlock tables");
	    $$usrerr_ref = "Error: IMAGE $metadata_url already exists!";
	    return undef;
	}
    }
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    # We allow providing an image descriptor index, so newimageid_ez can use
    # the same name, description, and index for both the OS and Image it makes.
    if ($imageid > 0 ) {
	# Make sure the OS descriptor for it already exists.
	if (!OSinfo->Lookup($imageid)) {
	    DBQueryWarn("unlock tables");
	    $$usrerr_ref = "Error: Missing OSinfo $imagename/$imageid in $pid!";
	    return undef;
	}
    } else {
	#
	# Grab unique ID. Table already locked.
	# 
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	$imageid  = TBGetUniqueIndex("next_osid", undef, 1);
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    }
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    #
    # The image UUID refers to the image, current version. Then each
    # version has its own uuid so it can be referred to. 
    #
    my $image_uuid   = NewUUID();
    my $version_uuid = NewUUID();
    #
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    # Some fields special cause of quoting.
    #
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    my $desc  = "''";
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    if (exists($argref->{'description'})) {
	$desc = DBQuoteSpecial($argref->{'description'});
    }
    
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    my $bquery = "imagename='$imagename'";
    $bquery .= ",imageid='$imageid'";
    $bquery .= ",pid='$pid',pid_idx='$pid_idx'";
    $bquery .= ",gid='$gid',gid_idx='$gid_idx'";
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    my $query = "insert into image_versions set $bquery, ".
	join(",", map("$_='" . $argref->{$_} . "'", @arg_slots));
    
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    $query .= ",creator='$uid',creator_idx='$uid_idx'";
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    $query .= ",uuid='$version_uuid'";
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    $query .= ",created=now()";
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    $query .= ",description=$desc";
    $query .= ",hash=" . DBQuoteSpecial($argref->{'hash'})
	if (exists($argref->{'hash'}));
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    #
    # If this is set in the environment, we use it. This allows
    # us to track actual geni users, since all of that happens
    # as geniuser. We do not bother to set this for local users.
    #
    if (exists($ENV{'GENIURN'}) && $ENV{'GENIURN'} ne "") {
	$query .= ",creator_urn=". DBQuoteSpecial($ENV{'GENIURN'});
    }
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    # Create the main entry:
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    if (! DBQueryWarn("insert into images set $bquery,uuid='$image_uuid'")) {
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	DBQueryWarn("unlock tables");
	tberror("Error inserting new images record for $pid/$imagename!");
	return undef;
    }
    # And the other entry.
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    if (! DBQueryWarn($query)) {
	DBQueryWarn("unlock tables");
	tberror("Error inserting new images record for $pid/$imagename!");
	return undef;
    }
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    DBQueryWarn("unlock tables");
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    my $image = Image->Lookup($imageid);
    # Create the osidtoimageid mapping.  Admins have an option to do it or not.
    my $makedefault = exists($argref->{"makedefault"}) && 
	$argref->{"makedefault"} eq "1";
    if (!$isadmin || $makedefault) {
	#
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	# Dig out the mtypes we want to turn on. The caller has already
	# sanity checked them to make sure the types actually exist, and
	# that there are nodes matching that type.
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	#
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	my @map_updates = ();
	foreach my $key (grep(/^mtype_/, keys(%{$argref}))) {
	    if ($argref->{$key} eq "1") {
		$key =~ s/^mtype_//;
		push(@map_updates, $key);
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	    }
	}

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	my @osid_array = ();
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	for (my $i = 1; $i <= 4; $i++) {
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	    my $func = "part${i}_osid";
	    my $foo  = $image->$func();
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	    if (defined($foo)) {
		push(@osid_array, $foo);
	    }
	}

	for (my $i = 0; $i <= $#map_updates; $i++) {
	    for (my $j = 0; $j <= $#osid_array; $j++) {
		 my $query = "INSERT INTO osidtoimageid ".
			     "       (osid, type, imageid) ".
			     "VALUES ('$osid_array[$j]', ".
			     "        '$map_updates[$i]', ".
			     "        '$imageid')";
		 ##print "$query\n";
		 if (! DBQueryWarn($query)) {
		     DBQueryWarn("unlock tables");
		     tberror("Error inserting new ostoimageid mapping for ".
			     "$pid/$imagename!");
		     return undef;
		 }
	    }
	}
    }
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    return $image;
}

#
# Clone an image descriptor from the DB, bumping the version number
#
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sub NewVersion($$$$)
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{
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    my ($self, $creator, $baseimage, $usrerr_ref) = @_;
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    my $osid        = $self->imageid();
    my $version     = $self->version();
    my $tableid     = int(rand(10000000));
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    my $typelist    = "";
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    my $ostablename = "os_info_versions" . $tableid;
    my $imtablename = "image_versions"  . $tableid;

    #
    # The pid/imageid has to be unique, so lock the table for the check/insert.
    #
    DBQueryWarn("lock tables images write, image_versions write, ".
		"            os_info write, os_info_versions write, ".
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		"            emulab_indicies write, osidtoimageid read")
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	or return undef;

    my $query_result =
	DBQueryWarn("create temporary table $ostablename ".
		    "select * from os_info_versions ".
		    "  where osid='$osid' and vers='$version'");
    goto bad
	if (!$query_result);

    $query_result =
	DBQueryWarn("create temporary table $imtablename ".
		    "select * from image_versions ".
		    "where imageid='$osid' and version='$version'");
    goto bad
	if (!$query_result);

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    #
    # Grab the current type list.
    #
    $query_result =
	DBQueryWarn("select distinct type from osidtoimageid ".
		    "where imageid='$osid'");
    
    goto bad
	if (!$query_result);

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    my @types = ();
    while (my ($type) = $query_result->fetchrow_array()) {
	push(@types, $type);
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    }
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    $typelist = join(",", @types);
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    #
    # Update the type list in the image being cloned. Better to do this
    # when the types are changed, but this works too since no one uses
    # this until the image is deleted.
    #
    DBQueryWarn("update image_versions set nodetypes='$typelist' ".
		"where imageid='$osid' and version='$version'");

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    #
    # Now reset a few things in each table.
    #
    my $clone_vers  = $self->version() + 1;
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    my $updater_urn = "";
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    #
    # If this is set in the environment, we use it. This allows
    # us to track actual geni users, since all of that happens
    # as geniuser. We do not bother to set this for local users.
    #
    if (exists($ENV{'GENIURN'}) && $ENV{'GENIURN'} ne "") {
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	$updater_urn = ",updater_urn=". DBQuoteSpecial($ENV{'GENIURN'});
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    }
    #
    # Figure out which partition needs to be changed. EZ images only
    # at this time.
    #
    my $part_vers = "";
    for (my $i = 1; $i <= 4; $i++) {
	my $func = "part${i}_osid";
	if (defined($self->$func())) {
	    $part_vers = "part${i}_vers='${clone_vers}'";
	    last;
	}
    }

    my $uid     = $creator->uid();
    my $uid_idx = $creator->uid_idx();

    #
    # The parent of this image might be this image, if taking a snapshot
    # of a node running the image. But we also need to support making a
    # version of the image, from a node running some other image. We still
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    # bump the version number, but the parent pointers are different.
    #
    # In one case, the base image is undef, which indicates a new version
    # not based on anything; we use this from the image_import with
    # update path. Not sure it is the correct approach yet.
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    #
    my ($parent_imageid, $parent_version);
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    if (!defined($baseimage)) {
	$parent_imageid = "NULL";
	$parent_version = "NULL";
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    }
    else {
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	if ($self->imageid() == $baseimage->imageid()) {
	    $parent_imageid = $self->imageid();
	    $parent_version = $self->version();
	}
	else {
	    $parent_imageid = $baseimage->imageid();
	    $parent_version = $baseimage->version();
	}
	$parent_imageid = "'$parent_imageid'";
	$parent_version = "'$parent_version'";
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    }

    #
    # Fix up the path by appending the version number.
    #
    my $path = $self->path();
    if ($path =~ /^(.*):\d+$/) {
	$path = $1 . ":${clone_vers}";
    }
    else {
	$path .= ":${clone_vers}";
    }
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    DBQueryWarn("update $ostablename set ".
		"  uuid=uuid(), ".
		"  vers='$clone_vers',".
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		"  parent_osid=$parent_imageid,".
		"  parent_vers=$parent_version ".
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		"where osid='$osid'")
	or goto bad;

    DBQueryWarn("update $imtablename set ".
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		"  uuid=uuid(),ready=0,path='$path',released=0, ".
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		"  $part_vers, default_vers='$clone_vers', ".
		"  version='$clone_vers',".
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		"  created=now(),nodetypes='$typelist', ".
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		"  parent_imageid=$parent_imageid,".
		"  parent_version=$parent_version, ".
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		"  updater='$uid',updater_idx='$uid_idx' $updater_urn ".
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		"where imageid='$osid'")
	or goto bad;

    #
    # And insert into the real table. At this point we will be
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    # inconsistent if we crash before the commit is done.
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    #
    if (! (DBQueryWarn("insert into os_info_versions ".
		       "select * from $ostablename") &&
	   DBQueryWarn("insert into image_versions ".
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		       "select * from $imtablename"))) {
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	DBQueryWarn("delete from os_info_versions ".
		    "where osid='$osid' and vers='$clone_vers'");
	DBQueryWarn("delete from image_versions ".
		    "where imageid='$osid' and version='$clone_vers'");
	goto bad;
    }
    
    DBQueryWarn("unlock tables");
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    return Image->Lookup($osid, $clone_vers);
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  bad:
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    DBQueryWarn("unlock tables");
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    return undef;
}
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#
# For a newly created image, set the provenance pointers back to
# the image from which it was derived.
#
sub SetProvenance($$)
{
    my ($self, $base) = @_;
    my $parent_imageid = $base->imageid();
    my $parent_version = $base->version();

    $self->Update({"parent_imageid" => $parent_imageid,
		   "parent_version" => $parent_version})
	== 0 or return -1;

    return 0;
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}

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#
# Highest number version, rather then what is deemed most recent by the
# images table.
#
sub LookupMostRecent($)
{
    my ($self) = @_;

    my $imageid = $self->imageid();

    my $query_result =
	DBQueryWarn("select version from image_versions ".
		    "where imageid='$imageid' order by version desc limit 1");
    return undef
	if (!$query_result);

    my ($version) = $query_result->fetchrow_array();
    return Image->Lookup($imageid, $version);
}

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#
# Return a list of all image versions.
#
sub AllVersions($$)
{
    my ($self, $pref)  = @_;
    my @result  = ();
    my $imageid = $self->imageid();

    my $query_result =
	DBQueryWarn("select version from image_versions ".
		    "where imageid='$imageid' order by version desc");
    return -1
	if (!$query_result);
    
    while (my ($version) = $query_result->fetchrow_array()) {
	my $image = Image->Lookup($imageid, $version);
	if (!defined($image)) {
	    print STDERR "Could not lookup image $imageid,$version\n";
	    return -1;
	}
	push(@result, $image);
    }
    @$pref = @result;
    return 0;
}

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#
# Release an image; all this does is make the highest numbered version
# in the image_versions table, the default version. It does this by
# updating the version number in the images table. An unreleased version
# can be used by explicitly giving the version number, but unqualified
# use always get the version that is set in the images table. 
#
sub Release($)
{
    my ($self) = @_;

    DBQueryWarn("lock tables images write, image_versions write, ".
		"            os_info write, os_info_versions write")
	or return -1;

    if (!$self->ready()) {
	print STDERR "Image::Release: $self is not marked ready!\n";
	goto bad;
    }
    my $imageid = $self->imageid();
    my $version = $self->version();

    #
    # Only the "head" version can be released.
    #
    my $query_result =
	DBQueryWarn("select max(version) from image_versions ".
		    "where imageid='$imageid'");
    goto bad
	if (!$query_result || !$query_result->numrows);

    my ($head) = $query_result->fetchrow_array();
    if ($head != $self->version()) {
	print STDERR "Image::Release: not the head version of $self\n";
	goto bad;
    }
    return -1
	if (! (DBQueryWarn("update os_info set version='$version' ".
			   "where osid='$imageid'") &&
	       DBQueryWarn("update images set version='$version' ".
			   "where imageid='$imageid'") &&
	       DBQueryWarn("update image_versions set released=1 ".
			   "where imageid='$imageid' and version='$version'")));
    DBQueryWarn("unlock tables");
    return 0;
  bad:
    DBQueryWarn("unlock tables");
    return -1;
}

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#
# Worker class method to edit image descriptor.
# Assumes most argument checking was done elsewhere.
#
sub EditImageid($$$$)
{
    my ($class, $image, $argref, $usrerr_ref) = @_;

    my %mods;
    my $noreport;

    my $imageid = $image->imageid();

    #
    # Now update the rest of the information in the DB.
    # (Others above already did their own updates.)
    #
    my %updates;
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    foreach my $col ("description", "path", "mbr_version", "hash", "notes") {
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	# Copy args we want so that others can't get through.
	if (exists($argref->{$col})) {
	    $updates{$col} = $mods{$col} = $argref->{$col};
	}
    }
    # See mtype_$type args below.

    #
    # Need a list of node types. We join this over the nodes table so that
    # we get a list of just the nodes that are currently in the testbed, not
    # just in the node_types table.
    #
    my $types_result =
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	DBQueryWarn("select distinct n.type from nodes as n ".
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		     "left join node_type_attributes as a on a.type=n.type ".
		     "where a.attrkey='imageable' and ".
		     "      a.attrvalue!='0'");
    my @mtypes_array;
    my @map_updates;
    my $redo_map = 0;
    while (my ($type) = $types_result->fetchrow_array()) {
	push(@mtypes_array, $type);
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    }
    #
    # Special hack to allow pcvm type -- see SetupReload in os_setup
    #
    push @mtypes_array, "pcvm";
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    foreach my $type (@mtypes_array) {
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	# Remember when we get one of the mtype_$type args.  These aren't DB
	# columns to update, but instead control re-creating the rows in the
	# osidtoimageid table for this imageid, below.
	my $mtype = "mtype_$type";
	if (exists($argref->{$mtype})) {
	    my $value = $argref->{$mtype};
	    ##printf "argref->{$mtype} %s\n", $value;
	    $mods{$mtype} = $value;
	    if ($value eq "1") {
		push(@map_updates, $type);
		$redo_map = 1;
	    }
	}
    }

    if (!keys %mods) {
	if (!$noreport) {
	    # Warn the user that the submit button was pressed with no effect.
	    $$usrerr_ref = "Submit: Nothing changed";
	    return undef;
	}
    }

    if (keys %updates || $redo_map) {
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	DBQueryWarn("lock tables images write, image_versions write, ".
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		    "     images as i write, image_versions as v write, ".
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		    "     os_info write, os_info_versions write, ".
		    "     osidtoimageid write");
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    }
    if (keys %updates) {
	if ($image->Update(\%updates)) {
	    $$usrerr_ref = "DB: Error updating the images table";
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	    DBQueryWarn("unlock tables");
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	    return undef;
	}
    }
    if ($redo_map) {
	#
	# Update the osidtoimageid table too.
	# 
	# Must delete old entries first.
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	DBQueryWarn("delete from osidtoimageid ".
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		     "where imageid='$imageid'");

	my @osid_array;
	for (my $i = 1; $i <= 4; $i++) {
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	    my $func = "part${i}_osid";
	    my $foo  = $image->$func();
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	    if (defined($foo)) {
		push(@osid_array, $foo);
	    }
	}
	for (my $i = 0; $i <= $#map_updates; $i++) {
	    for (my $j = 0; $j <= $#osid_array; $j++) {
		 my $query = "REPLACE INTO osidtoimageid ".
			     "       (osid, type, imageid) ".
			     "VALUES ('$osid_array[$j]', ".
			     "        '$map_updates[$i]', ".
			     "        '$imageid')";
		 ##print "$query\n";
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		 DBQueryWarn($query);
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	    }
	}
    }
    if (keys %updates || $redo_map) {
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	DBQueryWarn("unlock tables");
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    }

    return 1;
}

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#
# Stringify for output.
#
sub Stringify($)
{
    my ($self) = @_;
    
    my $pid       = $self->pid();
    my $imageid   = $self->imageid();
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    my $version   = $self->version();
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    my $imagename = $self->imagename();

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    return "[Image $imageid:$version $pid,$imagename]";
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}

#
# Return the internal DB rowref. Used for code that has not been converted.
#
sub DBData($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    return $self->{'IMAGE'}
}

#
# Perform some updates ...
#
sub Update($$)
{
    my ($self, $argref) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $imageid = $self->imageid();
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    my $version = $self->version();
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    my $query = 
	join(",", map("$_=" . DBQuoteSpecial($argref->{$_}), keys(%{$argref})));
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    $query .= " where imageid='$imageid' and version='$version'";
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    return -1
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	if (! DBQueryWarn("update image_versions set $query"));
	    
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    return Refresh($self);
}

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#
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# Delete an image,
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#
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sub Delete($;$)
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{
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    my ($self, $purge) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));

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    $purge = 0
	if (!defined($purge));
    
    my $imageid   = $self->imageid();
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    DBQueryWarn("lock tables images write, image_versions write, ".
		"            os_info write, os_info_versions write, ".
		"            osidtoimageid write, os_submap write, ".
		"            image_permissions write")
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	or return -1;

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    #
    # If provenance is on and not purging, then want to stash the
    # current type list so we can recall it later. 
    #
    if (!$purge && $DOPROVENANCE && !defined($self->nodetypes())) {
	my @typelist = $self->TypeList();
	if (@typelist) {
	    my $typelist = join(",", @typelist);
	    DBQueryWarn("update image_versions set nodetypes='$typelist' ".
			"where imageid='$imageid'")
	}
    }

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    #
    # If this is an EZ imageid, then delete the corresponding OSID too.
    #
    DBQueryWarn("delete from osidtoimageid where imageid='$imageid'")
	or goto bad;
    DBQueryWarn("delete from images where imageid='$imageid'")
	or goto bad;
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    if ($purge || !$DOPROVENANCE) {
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	goto bad
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	    if (! DBQueryWarn("delete from image_versions ".
			      "where imageid='$imageid'"));
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    }
    else {
	# Set deleted on all of the versions.
	DBQueryWarn("update image_versions set ".
		    "    deleted=now(),locked=null,locker_pid=0 ".
		    "where imageid='$imageid'")
	    or goto bad;
    }
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    if ($self->ezid()) {
	DBQueryWarn("delete from os_submap where osid='$imageid'")
	    or goto bad;
	DBQueryWarn("delete from os_info where osid='$imageid'")
	    or goto bad;
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	if ($purge || !$DOPROVENANCE) {
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	    DBQueryWarn("delete from os_info_versions where osid='$imageid'")
		or goto bad;
	}
	else {
	    # Set deleted on all of the versions.
	    DBQueryWarn("update os_info_versions set deleted=now() ".
			"where osid='$imageid'")
		or goto bad;
	}
	# Kill off the imageid permissions.
	DBQueryWarn("delete from image_permissions where imageid='$imageid'")
	    or goto bad;
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    }
    DBQueryWarn("unlock tables")
	or return -1;

    return 0;

  bad:
    DBQueryWarn("unlock tables");
    return -1;
}

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#
# Delete a version of an image. This is not to be used, except when there
# is an error during clone, and we want to undo the creation of a new version.
#
sub DeleteVersion($)
{
    my ($self) = @_;

    my $imageid   = $self->imageid();

    DBQueryWarn("lock tables images write, image_versions write, ".
		"            os_info write, os_info_versions write")
	or return -1;

    #
    # We do not allow the deletion if it is not the "head" version of the
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    # image_versions. Maybe later.
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    #
    my $query_result =
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	DBQueryWarn("select max(version) from image_versions ".
		    "where imageid='$imageid'");
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    goto bad
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	if (!$query_result || !$query_result->numrows);

    my ($version) = $query_result->fetchrow_array();
    if ($version != $self->version()) {
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	print STDERR "Image::DeleteVersion: not the head version of $self\n";
	goto bad;
    }

    goto bad
	if (! (DBQueryWarn("delete from image_versions ".
			   "where imageid='$imageid' and version='$version'") &&
	       DBQueryWarn("delete from os_info_versions ".
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			   "where osid='$imageid' and vers='$version'")));
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    DBQueryWarn("unlock tables")
	or return -1;
    return 0;

  bad:
    DBQueryWarn("unlock tables");
    return -1;
}

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#
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# Load the project object for an image
#
sub GetProject($)
{
    my ($self) = @_;
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    require Project;
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    # Must be a real reference. 
    return undef
	if (! ref($self));

    my $project = Project->Lookup($self->pid_idx());
    
    if (! defined($project)) {
	print("*** WARNING: Could not lookup project object for $self!", 1);
	return undef;
    }
    return $project;
}

#
# Load the group object for an image
#
sub GetGroup($)
{
    my ($self) = @_;
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    require Group;
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    # Must be a real reference. 
    return undef
	if (! ref($self));

    my $group = Group->Lookup($self->gid_idx());
    
    if (! defined($group)) {
	print("*** WARNING: Could not lookup group object for $self!", 1);
	return undef;
    }
    return $group;
}

#
# Check permissions. Note that root may ask permission, which comes in
# as an undef user.
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#
sub AccessCheck($$$)
{
    my ($self, $user, $access_type) = @_;
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    require Group;
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    # Must be a real reference. 
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    return 0
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	if (! ref($self));

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    if ($access_type < TB_IMAGEID_MIN || $access_type > TB_IMAGEID_MAX) {
	print "*** Invalid access type $access_type!\n";
	return 0;
    }
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    my $isadmin = ((defined($user) && $user->IsAdmin()) ||
		   ($UID == 0 || $UID eq "root") ? 1 : 0);
	
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    # Admins and root do whatever they want.
    return 1
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	if ($isadmin);
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    my $mintrust;
    
    #
    # Global ImageIDs can be read by anyone.
    #
    if ($self->global()) {
	if ($access_type == TB_IMAGEID_READINFO) {
	    return 1;
	}
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	if ($access_type == TB_IMAGEID_EXPORT && $isadmin) {
	    return 1;
	}
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    }

    my $project = $self->GetProject();
    return 0
	if (!defined($project));
    my $group = $self->GetGroup();
    return 0
	if (!defined($group));

    #
    # Otherwise must have proper trust in the group
    #
    if ($access_type == TB_IMAGEID_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
        #
        # Shared imageids are readable by anyone in the project.
        #
	if ($self->shared()) {
	    $group = $project->GetProjectGroup();
	}
    }
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    elsif ($access_type == TB_IMAGEID_EXPORT) {
	#
	# Owner or root in the project.
	#
	return 1
	    if ($user->uid_idx() == $self->creator_idx());

	$mintrust = PROJMEMBERTRUST_GROUPROOT;
    }
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    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    #
    # Either proper permission in the group, or group_root in the project.
    # This lets group_roots muck with other people's experiments, including
    # those in groups they do not belong to.
    #
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    return 1
	if (TBMinTrust($group->Trust($user), $mintrust) ||
	    TBMinTrust($project->Trust($user), PROJMEMBERTRUST_GROUPROOT));

    # No point in looking further; never allowed.
    return 0
	if ($access_type == TB_IMAGEID_EXPORT);

    #
    # Look in the image permissions. First look for a user permission,
    # then look for a group permission.
    #
    my $uid_idx = $user->uid_idx();
    my $imageid = $self->imageid();
    
    my $query_result = 
	DBQueryWarn("select allow_write from image_permissions ".
		    "where imageid='$imageid' and ".
		    "      permission_type='user' and ".
		    "      permission_idx='$uid_idx'");
    return 0
	if (!$query_result);
    
    if ($query_result->numrows) {
	# READINFO is read-only access to the image and its contents.
	return 1
	    if ($access_type == TB_IMAGEID_READINFO());
	
	if ($access_type == TB_IMAGEID_ACCESS()) {
	    my ($allow_write) = $query_result->fetchrow_array();

	    return 1
		if ($allow_write);
	}
    }
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    my $trust_none = $Group::MemberShip::TRUSTSTRING_NONE;
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    $query_result = 
	DBQueryFatal("select allow_write from group_membership as g ".
		     "left join image_permissions as p on ".
		     "     p.permission_type='group' and ".
		     "     p.permission_idx=g.gid_idx ".
		     "where g.uid_idx='$uid_idx' and ".
		     "      p.imageid='$imageid' and ".
		     "      trust!='$trust_none'");

    if ($query_result->numrows) {
	# READINFO is read-only access to the image and its contents.
	return 1
	    if ($access_type == TB_IMAGEID_READINFO());
	
	if ($access_type == TB_IMAGEID_ACCESS()) {
	    my ($allow_write) = $query_result->fetchrow_array();

	    return 1
		if ($allow_write);
	}
    }
    return 0;
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}

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#
# LockTables simply locks the given tables, and then refreshes the
# instance (thereby getting the data from the DB after the tables are locked).
#
sub LockTables($;$)
{
    my ($self, $spec) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    $spec = "images write"
	if (!defined($spec));
    
    DBQueryWarn("lock tables $spec")
	or return -1;
	
    return $self->Refresh();
}
sub UnLockTables($)
{
    my ($self) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    DBQueryWarn("unlock tables")
	or return -1;
    return 0;
}

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#
# Return updated time for image as a UNIX timestamp via the passed ref.
# Return 0 on success, non-zero otherwise.
#
sub GetUpdate($$)
{
    my ($self,$stampp) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));

    my $imageid     = $self->imageid();

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    my $result = DBQueryWarn("select UNIX_TIMESTAMP(updated) ".
			     "  from image_versions ".
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			     "where imageid='$imageid'");
    if ($result && $result->numrows) {
	my ($stamp) = $result->fetchrow_array();
	$$stampp = $stamp;
	return 0;
    }
}

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#
# Get the disk offset at which the image will be loaded.
# For a "whole disk" (loadpart == 0) image, it is always 0.
# For a "partition" image, it depends on the MBR type of the image.
#
# Returns -1 if the offset could not be determined (e.g., unknown MBR).
#
sub GetDiskOffset($)
{
    my ($self) = @_;

    # XXX these should come out of the DB or not exist at all!
    my %mbr = (
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	"1" => [0,   63,  6281415, 12562830, 12819870],
	"2" => [0,   63, 12305853, 24611643, 26712000],
	"3" => [0, 2048, 33556480, 39847936, 46139392]
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    );

    # Must be a real reference. 
    return -1
	if (! ref($self));

    return -1
	if (! exists($mbr{$self->mbr_version()}));

    return -1
	if ($self->loadpart() > 4);

    return $mbr{$self->mbr_version()}[$self->loadpart()];
}

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#
# Mark the update time in the record,
#
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sub MarkUpdate($$;$)
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{
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    my ($self, $user, $stamp) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));

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    my $imageid     = $self->imageid();
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    my $version     = $self->version();
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    my $updater     = "";
    my $updater_idx = "";
    my $updater_urn = "";
    if (defined($user)) {
	$updater     = ", updater='" . $user->uid() . "'";
	$updater_idx = ", updater_idx='" . $user->uid_idx() . "'";
    }
    #
    # If this is set in the environment, we use it. This allows
    # us to track actual geni users, since all of that happens
    # as geniuser. We do not bother to set this for local users.
    #
    if (exists($ENV{'GENIURN'}) && $ENV{'GENIURN'} ne "") {
	$updater_urn = ", updater_urn=". DBQuoteSpecial($ENV{'GENIURN'});
    }
    
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    if (defined($stamp)) {
	$stamp="FROM_UNIXTIME($stamp)";
    }
    else {
	$stamp="now()";
    }

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    return -1
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	if (! DBQueryWarn("update image_versions set updated=$stamp " .
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			  "  $updater $updater_idx $updater_urn ".
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			  "where imageid='$imageid' and version='$version'"));
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    return 0;
}

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#
# Set the hash.
#
sub SetHash($$)
{
    my ($self, $hash) = @_;

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    return $self->Update({"hash" => $hash});
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}

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#
# Set the size.
#
sub SetSize($$)
{
    my ($self, $size) = @_;

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    return $self->Update({"size" => $size});
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}

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#
# Set the sector range of an image.
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# Note that lba_size and reloc flag are left alone unless explicitly specified.
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#
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sub SetRange($$$;$$)
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{
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    my ($self,$start,$end,$ssize,$isreloc) = @_;
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    my $argref = {"lba_low" => $start, "lba_high" => $end};
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    if (defined($ssize)) {
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	$argref->{'lba_size'} = $ssize;
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    }
    if (defined($isreloc)) {
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	$argref->{'relocatable'} = $isreloc;
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    }
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    return $self->Update($argref);
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}

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#
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# Lock and Unlock. We lock the entire chain (all versions) of the
# image. 
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#
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sub Lock($)
{
    my ($self) = @_;

    return -1
	if (! ref($self));
    return -1
	if (!DBQueryWarn("lock tables images write"));

    my $imageid = $self->imageid();

    my $query_result =
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	DBQueryWarn("update images set locked=now(),locker_pid=$PID " .
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		    "where imageid='$imageid' and locked is null");

    if (! $query_result ||
	$query_result->numrows == 0) {
	DBQueryWarn("unlock tables");
	return -1;
    }
    DBQueryWarn("unlock tables");
    $self->{'IMAGE'}->{'locked'} = time();
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    $self->{'IMAGE'}->{'locker_pid'} = $PID;
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    return 0;
}

sub Unlock($)
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{
    my ($self) = @_;
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    # Must be a real reference. 
    return -1
	if (! ref($self));

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    my $imageid = $self->imageid();
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    return -1
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	if (! DBQueryWarn("update images set locked=null,locker_pid=0 " .
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			  "where imageid='$imageid'"));
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    $self->{'IMAGE'}->{'locked'} = 0;
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    $self->{'IMAGE'}->{'locker_pid'} = 0;
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    return 0;
}

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sub GotLock($)
{
    my ($self) = @_;

    return 1
	if ($self->{'IMAGE'}->{'locked'} &&
	    $self->{'IMAGE'}->{'locker_pid'} == $PID);
    
    return 0;
}

#
# Wait to get lock.
#
sub WaitLock($$)
{