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/usr/lib/oar/oarremoveresource is in oar-server 2.5.2-4.1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/perl
# $Id$
#

use strict;
use warnings;
use Data::Dumper;
use DBI();
use OAR::IO;

my $Old_umask = sprintf("%lo",umask());
umask(oct("022"));

sub usage(){
    print <<EOS;
Usage: oarremoveresource resource_number
WARNING : this command removes all records in the database
about "resource_number".

So you will loose this resource history and jobs executed on this one
EOS
    exit(1);
}

usage if ((@ARGV < 1) || !($ARGV[0] =~ /^\d+$/));

my $Resource = $ARGV[0];
print "Resource to remove : $Resource\n";

my $exit_code = 0;

my $base = OAR::IO::connect();
OAR::IO::lock_table($base,["resources","resource_logs","assigned_resources","jobs","frag_jobs","event_logs","event_log_hostnames"]);

my $resource_ref = OAR::IO::get_resource_info($base,$Resource);
if (defined($resource_ref->{state}) && ($resource_ref->{state} eq "Dead")){
    my $sth = $base->prepare("  SELECT jobs.job_id, jobs.assigned_moldable_job
                                FROM assigned_resources, jobs
                                WHERE
                                    assigned_resources.resource_id = $Resource
                                    AND assigned_resources.moldable_job_id = jobs.assigned_moldable_job
                             ");
    $sth->execute();
    my @jobList;
    while (my @ref = $sth->fetchrow_array()) {
        push(@jobList, [$ref[0], $ref[1]]);
    }
    $sth->finish();
    foreach my $i (@jobList){
        print("\tRemove the job $i->[0], it was run on the resource $Resource\n");
        $base->do("DELETE from event_logs         WHERE job_id = $i->[0]");
        $base->do("DELETE from frag_jobs          WHERE frag_id_job = $i->[0]");
        $base->do("DELETE from jobs               WHERE job_id = $i->[0]");
        $base->do("DELETE from assigned_resources WHERE moldable_job_id = $i->[1]");
    }
    $base->do("DELETE from assigned_resources     WHERE resource_id = $Resource");
    $base->do("DELETE from resource_logs          WHERE resource_id = $Resource");
    $base->do("DELETE from resources              WHERE resource_id = $Resource");
    print("Resource $Resource removed.\n");
}else{
    print("/!\\ The state of the resource $Resource must be set to Dead before.\n");
    $exit_code = 2;
}

OAR::IO::unlock_table($base);
OAR::IO::disconnect($base);

exit($exit_code);