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/usr/sbin/amdevcheck is in amanda-common 1:3.3.6-4.

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The actual contents of the file can be viewed below.

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#! /usr/bin/perl
# Copyright (c) 2009-2013 Zmanda, Inc.  All Rights Reserved.
#
# 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.,
# 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
#
# Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
# Sunnyvale, CA 94086, USA, or: http://www.zmanda.com

use lib '/usr/lib/amanda/perl';
use Getopt::Long;

use strict;
use warnings;
use Amanda::Device qw( :constants );
use Amanda::Config qw( :getconf :init );
use Amanda::Debug qw( :logging );
use Amanda::Util qw( :constants );

# try to open the device and read its label, returning the device_read_label
# result (one or more of ReadLabelStatusFlags)
sub try_read_label {
    my ($device) = @_;

    my $result;
    $result = $device->read_label();
    if ($device->status() != $DEVICE_STATUS_SUCCESS ) {
        $result = $device->status();
    }
    return $result;
}

sub list_device_property {
    my ( $device, $plist ) = @_;
    my @proplist;

    my $result;
    if (!$plist ) {
        if ($device->status() == $DEVICE_STATUS_SUCCESS ) {
            my @list = $device->property_list();
            foreach my $line (@list) {
                push(@proplist, $line->{'name'} );
            }
        } else {
            $result = $device->status();
            print_result($result, $device->error() );
            return $result;
        }
    } else {
        @proplist = split(/,/, $plist );
    }

    foreach my $prop (sort @proplist ) {
        my $value = $device->property_get(lc($prop) );
        print uc($prop) . "=$value\n" if (defined($value) );
    }
    return;
}

# print the results, one flag per line
sub print_result {
    my ($flags, $errmsg) = @_;

    if ($flags != $DEVICE_STATUS_SUCCESS) {
	print "MESSAGE $errmsg\n";
    }
    print join( "\n", DeviceStatusFlags_to_strings($flags) ), "\n";
}

sub usage {
    print <<EOF;
Usage: amdevcheck [--label] [--properties {prop1,prop2,prop3}] [-o configoption]* <config> [<device name>]
EOF
    exit(1);
}

## Application initialization

Amanda::Util::setup_application("amdevcheck", "server", $CONTEXT_SCRIPTUTIL);

my $config_overrides = new_config_overrides($#ARGV+1);
my $getproplist;
my $device_name;
my $print_label;

debug("Arguments: " . join(' ', @ARGV));
Getopt::Long::Configure(qw(bundling));
GetOptions(
    'version' => \&Amanda::Util::version_opt,
    'help|usage|?' => \&usage,
    'o=s' => sub { add_config_override_opt($config_overrides, $_[1]); },
    'properties:s' => \$getproplist,
    'label' => \$print_label
) or usage();

usage() if ( @ARGV < 1 || @ARGV > 3 );
my $config_name = $ARGV[0];

set_config_overrides($config_overrides);
config_init($CONFIG_INIT_EXPLICIT_NAME, $config_name);
my ($cfgerr_level, @cfgerr_errors) = config_errors();
if ($cfgerr_level >= $CFGERR_WARNINGS) {
    config_print_errors();
    if ($cfgerr_level >= $CFGERR_ERRORS) {
	die("errors processing config file");
    }
}

Amanda::Util::finish_setup($RUNNING_AS_DUMPUSER);

my $result;

if (defined $getproplist && defined $print_label) {
    die("Can't set both --label and --properties");
}
if ( $#ARGV == 1 ) {
    $device_name = $ARGV[1];
} else {
    $device_name = getconf($CNF_TAPEDEV);
}

my $device = Amanda::Device->new($device_name);
if ( !$device ) {
    die("Error creating $device_name");
}

$result = $device->status();
if ($result == $DEVICE_STATUS_SUCCESS) {
    $device->configure(1);
    if (defined $getproplist) {
        list_device_property($device,$getproplist);
        exit 0;
    }
    $result = try_read_label($device);
    if (defined $print_label) {
        if ($result == $DEVICE_STATUS_SUCCESS) {
            print $device->volume_label(), "\n";
            exit 0;
        } else {
            exit 1;
	}
    } else {
        print_result($result, $device->error());
	exit 0;
    }
} else {
    if (!defined $getproplist && !defined $print_label) {
        print_result($result, $device->error());
        exit 0;
    } else {
        exit 1;
    }
}

Amanda::Util::finish_application();
exit 0;