#!/usr/bin/perl
# 
# This updates the host system. 
# NOTE: This doesn't update the Anvil! software stack yet, just the OS.
# 
# - On Striker; This will take the system offline and then run 'dnf -y update'. 
# - On Nodes; This will do nothing until all servers are off the node. Then the node will be withdrawn, 
#   updated and then rejoin the cluster.
# - On DR; This will do nothing until no servers are running, then it will update the system.
#  
# In all cases, the system will be rebooted if the kernel is updated.
# 
# Exit codes;
# 0 = Normal exit.
# 1 = No database connections available.
# 2 = The job UUID was passed, but it wasn't valid.
# 3 = It looks like the update failed, reset progress to '0'.
# 4 = Failed to withdraw the node from the cluster.
# 
# TODO: 
#  - Rebuild this to be 'striker-update-system' and have it update local strikers and all nodes.
# 

use strict;
use warnings;
use Anvil::Tools;

# Disable buffering
$| = 1;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

my $anvil = Anvil::Tools->new();

### TODO: Remove this before final release
$anvil->Log->level({set => 2});
$anvil->Log->secure({set => 1});
##########################################

# Read switches (target ([user@]host[:port]) and the file with the target's password.
$anvil->Get->switches({list => [
	"clear-cache",
	"no-db", 
	"no-reboot",
	"reboot"], man => $THIS_FILE});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => $anvil->data->{switches}});
$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, key => "log_0115", variables => { program => $THIS_FILE }});

# Connect to DBs.
if ($anvil->data->{switches}{'no-db'})
{
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, secure => 0, key => "log_0743"});
	
	# If there was a job-uuid, clear it.
	$anvil->data->{sys}{database}{connections} = 0;
	$anvil->data->{switches}{'job-uuid'}       = "";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		'sys::database::connections' => $anvil->data->{sys}{database}{connections},
		'switches::job-uuid'         => $anvil->data->{switches}{'job-uuid'},
	}});
}
else
{
	$anvil->Database->connect;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 3, secure => 0, key => "log_0132"});
	if (not $anvil->data->{sys}{database}{connections})
	{
		# No databases, exit.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, secure => 0, key => "error_0003"});
		$anvil->nice_exit({exit_code => 1});
	}
}

if ($anvil->data->{switches}{'job-uuid'})
{
	# See if another instance is running. If so, sleep for 10 seconds and then exit. The other instance 
	# could be the '--no-db' run we're about to clobber.
	my $pids = $anvil->System->pids({
		ignore_me    => 1,
		program_name => $THIS_FILE,
	});
	my $other_instances = @{$pids};
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { other_instances => $other_instances }});
	
	if ($other_instances)
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 1, key => "message_0233", variables => { program => $THIS_FILE }});
		sleep 10;
		$anvil->nice_exit({exit_code => 0});
	}
	
	# Load the job details. If anything is returned, there was a problem.
	my $return = $anvil->Job->get_job_details({job_uuid => $anvil->data->{switches}{'job-uuid'}});
	if ($return)
	{
		# It's not a UUID.
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 'return' => $return }});
		$anvil->nice_exit({exit_code => 2});
	}
}

# Clear any old runs.
update_progress($anvil, 0, "clear");

# We'll keep a count of lines and packages to show the user.
$anvil->data->{counts}{downloaded} = 0;
$anvil->data->{counts}{installed}  = 0;
$anvil->data->{counts}{verified}   = 0;
$anvil->data->{counts}{lines}      = 0;

# Mark that we're starting
update_progress($anvil, 1, "message_0058,!!downloaded!0!!,!!installed!0!!,!!verified!0!!,!!lines!0!!");
update_progress($anvil, 2, "message_0033");

# Make sure maintenance mode is enabled.
$anvil->System->maintenance_mode({set => 1}) if $anvil->data->{sys}{database}{connections};

# Run the update
run_os_update($anvil, 3);

# If we had no database, try to reconnect now tha
if (not $anvil->data->{sys}{database}{connections})
{
	# Start the anvil-daemon, the caller likely called without a DB because we're being updated by 
	# striker-update-cluster, and so there will be a job waiting for us.
	$anvil->System->enable_daemon({now => 1, daemon => "anvil-daemon"});
	$anvil->System->enable_daemon({now => 1, daemon => "scancore"});
	
	$anvil->Database->connect;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 2, secure => 0, key => "log_0132"});
	
	if ($anvil->data->{sys}{database}{connections})
	{
		# If there's a job for us waiting, mark it as almost done.
		my $query = "
SELECT 
    job_uuid 
FROM 
    jobs 
WHERE 
    job_command   LIKE '%".$THIS_FILE."%'
AND 
    job_host_uuid = ".$anvil->Database->quote($anvil->Get->host_uuid)."
AND
   job_progress   = 0 
;";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
		
		my $job_uuid = $anvil->Database->query({query => $query, source => $THIS_FILE, line => __LINE__})->[0]->[0];
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { job_uuid => $job_uuid }});
		
		if ($job_uuid)
		{
			$anvil->data->{jobs}{job_uuid}       = $job_uuid;
			$anvil->data->{switches}{'job-uuid'} = $job_uuid;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				'jobs::job_uuid'     => $anvil->data->{jobs}{job_uuid},
				'switches::job-uuid' => $anvil->data->{switches}{'job-uuid'},
			}});
			
			update_progress($anvil, 0, "clear");
			update_progress($anvil, 90, "message_0324");
		}
	}
}

# We're done updating
my $reboot_needed = $anvil->System->reboot_needed({debug => 2});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { reboot_needed => $reboot_needed }});
if ($reboot_needed)
{
	if (not $anvil->data->{switches}{'no-reboot'})
	{
		# Clear maintenance mode.
		$anvil->System->maintenance_mode({set => 0}) if $anvil->data->{sys}{database}{connections};
		
		# Record that we're rebooting so that 'striker-update-cluster' knows to wait for a reboot.
		if ($anvil->data->{switches}{'job-uuid'})
		{
			my $query = "
UPDATE 
    jobs 
SET 
    job_data      = 'rebooted', 
    modified_date = ".$anvil->Database->quote($anvil->Database->refresh_timestamp)." 
WHERE 
    job_uuid = ".$anvil->Database->quote($anvil->data->{switches}{'job-uuid'})."
;";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
			$anvil->Database->write({query => $query, source => $THIS_FILE, line => __LINE__});
		}
		
		# Register a job to reboot.
		update_progress($anvil, 98, "message_0318");
		
		# Record that we're going to reboot now.
		update_progress($anvil, 100, "message_0317");
		
		if ($anvil->data->{sys}{database}{connections})
		{
			my ($job_uuid) = $anvil->Database->insert_or_update_jobs({
				file            => $THIS_FILE, 
				line            => __LINE__, 
				job_command     => $anvil->data->{path}{exe}{'anvil-manage-power'}." --reboot -y".$anvil->Log->switches, 
				job_data        => "", 
				job_name        => "reboot::system", 
				job_title       => "job_0009", 
				job_description => "job_0006", 
				job_progress    => 0,
				job_status      => "anvil_startup",
			});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { job_uuid => $job_uuid }});
			
			# If we got a job UUID, unlink the cache file.
			if (-e $anvil->data->{path}{data}{reboot_cache})
			{
				unlink $anvil->data->{path}{data}{reboot_cache};
			}
		}
	}
	else
	{
		# Record that a reboot is needed.
		update_progress($anvil, 100, "message_0039");
	}
}
else
{
	update_progress($anvil, 100, "message_0040");
}

# Clear maintenance mode.
$anvil->System->maintenance_mode({set => 0}) if $anvil->data->{sys}{database}{connections};

$anvil->nice_exit({exit_code => 0});


#############################################################################################################
# Functions                                                                                                 #
#############################################################################################################

# This updates the progress if we were called with a job UUID.
sub update_progress
{
	my ($anvil, $progress, $message) = @_;
	
	# Log the progress percentage.
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		progress         => $progress,
		message          => $message, 
		"jobs::job_uuid" => $anvil->data->{jobs}{job_uuid}, 
	}});
	
	if ($progress > 100)
	{
		$progress = 100;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { progress => $progress }});
	}
	
	if ($anvil->data->{jobs}{job_uuid})
	{
		$anvil->Job->update_progress({
			debug    => 2, 
			'print'  => 1,
			progress => $progress, 
			message  => $message, 
			job_uuid => $anvil->data->{jobs}{job_uuid},
		});
	}
	
	return(0);
}

# This updates the OS.
sub run_os_update
{
	my ($anvil, $progress) = @_;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { progress => $progress }});
	
	# This needs to be set to avoid warnings when called without a job-uuid.
	$anvil->data->{sys}{last_update} = 0;
	
	# Make sure that, if we're a node, we're out of the cluster.
	my $host_type = $anvil->Get->host_type();
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { host_type => $host_type }});
	if ($host_type eq "node")
	{
		# Call anvil-safe-stop
		update_progress($anvil, $progress++, "message_0314");
		
		my $problem = $anvil->Cluster->parse_cib();
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { problem => $problem }});
		if (not $problem)
		{
			# Call anvil-safe-stop
			update_progress($anvil, $progress++, "message_0315");
			
			my $shell_call = $anvil->data->{path}{exe}{'anvil-safe-stop'};
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
			
			my ($output, $return_code) = $anvil->System->call({shell_call => $shell_call});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				output      => $output, 
				return_code => $return_code, 
			}});
			
			if ($return_code)
			{
				# Something went wrong, abort.
				update_progress($anvil, 100, "error_0420,!!return_code!".$return_code."!!,!!output!".$output."!!");
				
				# Set the job_data to 'failed' so that striker-update-cluster' knows to abort.
				if ($anvil->data->{switches}{'job-uuid'})
				{
					my $query = "
UPDATE 
    jobs 
SET 
    job_data      = 'failed', 
    modified_date = ".$anvil->Database->quote($anvil->Database->refresh_timestamp)." 
WHERE 
    job_uuid = ".$anvil->Database->quote($anvil->data->{switches}{'job-uuid'})."
;";
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { query => $query }});
					$anvil->Database->write({query => $query, source => $THIS_FILE, line => __LINE__});
				}
				
				$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, key => "error_0035", variables => { output => $output } });
				$anvil->nice_exit({exit_code => 4});
			}
		}
	}
	
	# Should we clear the cache?
	if ($anvil->data->{switches}{'clear-cache'})
	{
		# Yes.
		my $shell_call  = $anvil->data->{path}{exe}{dnf}." clean all";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
		my ($output, $return_code) = $anvil->System->call({shell_call => $shell_call});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			output      => $output, 
			return_code => $return_code, 
		}});
		update_progress($anvil, 5, "message_0316");
	}
	
	# Before we start, do we need to remove our locally build DRBD kernel modules?
	my $package_changes  = 0;
	my $remove_drbd_kmod = 0;
	my $shell_call       = $anvil->data->{path}{exe}{dnf}." check-update";
	open (my $file_handle, $shell_call." 2>&1 |") or $anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, priority => "err", key => "log_0014", variables => { shell_call => $shell_call, error => $! }});
	while(<$file_handle>)
	{
		chomp;
		my $line = $anvil->Words->clean_spaces({string => $_});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { line => $line }});
		
		if (($line =~ /kmod-drbd/) or ($line =~ /kernel/))
		{
			# Looks like it.
			$remove_drbd_kmod = 1;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { remove_drbd_kmod => $remove_drbd_kmod }});
			last;
		}
		
	}
	close $file_handle;
	
	# So, shall we?
	if ($remove_drbd_kmod)
	{
		# Yes, remove
		update_progress($anvil, $progress++, "message_0320");
		my $versions_to_remove = "";
		my $shell_call         = $anvil->data->{path}{exe}{dnf}." list installed";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
		
		my ($output, $return_code) = $anvil->System->call({shell_call => $shell_call});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
			output      => $output, 
			return_code => $return_code, 
		}});
		foreach my $line (split/\n/, $output)
		{
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { line => $line }});
			if ($line =~ /(kmod-drbd-\d+.*?)\s/)
			{
				$versions_to_remove .= $1." ";
				$package_changes++;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
					versions_to_remove => $versions_to_remove,
					package_changes    => $package_changes, 
				}});
			}
		}
		
		# Now remove those packages.
		update_progress($anvil, $progress++, "message_0321");
		$shell_call = $anvil->data->{path}{exe}{dnf}." -y remove ".$versions_to_remove;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
		
		open ($file_handle, $shell_call." 2>&1 |") or $anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, priority => "err", key => "log_0014", variables => { shell_call => $shell_call, error => $! }});
		while(<$file_handle>)
		{
			chomp;
			my $line = $anvil->Words->clean_spaces({string => $_});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { line => $line }});
		}
		close $file_handle;
	}
	
	# NOTE: We run this directly to better monitor progress and update the progress.
	my $transaction_shown = 0;
	my $success           = 0;
	my $to_update         = 0;
	my $percent_step      = 0;
	my $counted_lines     = 0;
	my $next_step         = 0;
	my $verifying         = 0;
	my $output            = "";
	   $shell_call        = $anvil->data->{path}{exe}{dnf}." -y update; ".$anvil->data->{path}{exe}{echo}." return_code:\$?";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { shell_call => $shell_call }});
	open ($file_handle, $shell_call." 2>&1 |") or $anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, priority => "err", key => "log_0014", variables => { shell_call => $shell_call, error => $! }});
	while(<$file_handle>)
	{
		chomp;
		my $line   =  $_;
		   $output .= $line."\n";
		   $line   =  $anvil->Words->clean_spaces({string => $line});
		   $anvil->data->{counts}{lines}++;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { "counts::lines" => $anvil->data->{counts}{lines}, line => $line }});
		
		# If there were no updates, let the user know.
		if ($line =~ /^Nothing to do/i)
		{
			update_progress($anvil, 95, "message_0057");
		}
		
		if ((not $verifying) && ($line =~ /^Verifying /i))
		{
			# Update done, verifying now.
			$verifying = 1;
			update_progress($anvil, $progress++, "message_0038");
		}
		
		if ($line =~ /Running transaction/i)
		{
			# Done downloading
			if (not $transaction_shown)
			{
				update_progress($anvil, $progress++, "message_0037");
				$transaction_shown = 1;
			}
		}
		
		if ($line =~ /return_code:(\d+)$/)
		{
			my $return_code = $1;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { return_code => $return_code }});
			if ($return_code == 0)
			{
				$success = 1;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { success => $success }});
			}
		}
		
		if (($line =~ / (\d+) Packages$/i) or ($line =~ / (\d+) Package$/i))
		{
			my $counted_lines   =  $1;
			   $package_changes =  $counted_lines;
			   $to_update       += $counted_lines;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				package_changes => $package_changes, 
				counted_lines   => $counted_lines,
				to_update       => $to_update, 
			}});
		}
		
		if ($line =~ /Total download size: (.*)$/i)
		{
			my $update_size = $1;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { update_size => $update_size }});
			
			# Ready to install, update to 5%. The next step will count up to 95%.
			update_progress($anvil, $progress++, "message_0035,!!size!$update_size!!");
			
			# The total (reliable) count of events is (to_update * 3), counting '(x/y): ' 
			# (download), 'Upgrading '/'Installing ' and 'Verifying '. We ignore the scriplet
			# and other lines as it's hard to predict how many there will be, and they pass fast
			# enough to not really matter for a progress bar.
			$to_update    *= 4;
			$percent_step =  $anvil->Convert->round({number => ($to_update / 90)});
			$next_step    =  $percent_step;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				to_update    => $to_update, 
				percent_step => $percent_step, 
				next_step    => $next_step, 
			}});
		}
		
		# If 'percent_step' is set, we're ready to start counting lines.
		if (($percent_step) && (($line =~ /\(\d+\/\d+\): /) or ($line =~ /^Upgrading /i) or ($line =~ /^Installing /) or ($line =~ /^Cleanup /i) or ($line =~ /^Verifying /i)))
		{
			$counted_lines++;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { counted_lines => $counted_lines }});
			
			if ($line =~ /\(\d+\/\d+\): /)
			{
				$anvil->data->{counts}{downloaded}++;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { "counts::downloaded" => $anvil->data->{counts}{downloaded} }});
			}
			if (($line =~ /^Upgrading /i) or ($line =~ /^Installing /))
			{
				$anvil->data->{counts}{installed}++;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { "counts::installed" => $anvil->data->{counts}{installed} }});
			}
			if ($line =~ /^Verifying /i)
			{
				$anvil->data->{counts}{verified}++;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { "counts::verified" => $anvil->data->{counts}{verified} }});
			}
			
			if ($counted_lines > $next_step)
			{
				# Step up the progress.
				$next_step += $percent_step;
				$progress++;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { 
					next_step => $next_step,
					progress  => $progress, 
				}});
				$progress = 95 if $progress > 95;
				
				update_progress($anvil, $progress, "");
			}
		}
		
		# Update the progress if it's been more than a second since the last update.
		if (time > $anvil->data->{sys}{last_update})
		{
			$progress = 95 if $progress > 95;
			update_progress($anvil, $progress, "");
		}
	}
	close $file_handle;
	
	# Reload daemons to pick up any changed systemctl daemons.
	$shell_call = $anvil->data->{path}{exe}{systemctl}." daemon-reload";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
	my ($systemctl_output, $return_code) = $anvil->System->call({shell_call => $shell_call});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { systemctl_output => $systemctl_output, return_code => $return_code }});
	
	### See if the kernel has been updated.
	# Get the newest installed kernel
	$shell_call = $anvil->data->{path}{exe}{rpm}." -q kernel | ".$anvil->data->{path}{exe}{'sort'}." | ".$anvil->data->{path}{exe}{tail}." -n 1";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
	(my $installed_kernel, $return_code) = $anvil->System->call({shell_call => $shell_call});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		installed_kernel => $installed_kernel, 
		return_code      => $return_code, 
	}});
	$installed_kernel =~ s/^kernel-(\d+.\d+\.\d+-\d+)\..*$/$1/;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { installed_kernel => $installed_kernel }});
	
	# Get the running kernel
	$shell_call = $anvil->data->{path}{exe}{uname}." -r";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
	(my $active_kernel, $return_code) = $anvil->System->call({shell_call => $shell_call});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		active_kernel => $active_kernel, 
		return_code   => $return_code, 
	}});
	$active_kernel =~ s/(\d+.\d+\.\d+-\d+)\..*$/$1/;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { active_kernel => $active_kernel }});
	
	if ($installed_kernel ne $active_kernel)
	{
		# Reboot needed
		$anvil->data->{sys}{reboot} = 1;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 'sys::reboot' => $anvil->data->{sys}{reboot} }});
	}
	
	# If we installed and packages, and '--reboot' was given, reboot anyway.
	if (($package_changes) && ($anvil->data->{switches}{reboot}))
	{
		# Reboot needed
		$anvil->data->{sys}{reboot} = 1;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 'sys::reboot' => $anvil->data->{sys}{reboot} }});
		my $reboot_needed = $anvil->System->reboot_needed({set => 1});
	}
	
	# Did it work?
	if (not $success)
	{
		# Nope.
		update_progress($anvil, 0, "message_0036");
		
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, secure => 0, key => "error_0035", variables => { output => $output } });
		sleep 5;
		$anvil->nice_exit({exit_code => 3});
	}
	
	# Run anvil-version-changes.
	$shell_call = $anvil->data->{path}{exe}{'anvil-version-changes'}.$anvil->Log->switches;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { shell_call => $shell_call }});
	
	($output, $return_code) = $anvil->System->call({shell_call => $shell_call});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
		output      => $output,
		return_code => $return_code, 
	}});
	
	return(0);
};