#!/usr/bin/perl

use strict;
use warnings;

use File::Path;
use IO::Dir;
use POSIX;

use PVE::GuestHelpers;
use PVE::LXC::Config;
use PVE::LXC::Tools;
use PVE::LXC;
use PVE::Network;
use PVE::RESTEnvironment;
use PVE::Storage;
use PVE::Tools;

PVE::LXC::Tools::lxc_hook('post-stop', 'lxc', sub {
    my ($vmid, $vars, undef, undef) = @_;

    return undef if ! -f PVE::LXC::Config->config_file($vmid);

    PVE::RESTEnvironment->setup_default_cli_env();

    my $conf = PVE::LXC::Config->load_config($vmid);

    my $storage_cfg = PVE::Storage::config();

    PVE::Tools::run_command(['umount', '--recursive', '--', $vars->{ROOTFS_PATH}]);
    my $staging_dir = PVE::LXC::get_staging_tempfs();
    if (my $dh = IO::Dir->new($staging_dir)) {
	while (defined(my $dir = $dh->read)) {
	    next if $dir eq '.' || $dir eq '..';
	    eval {
		PVE::Tools::run_command(['umount', '--', "$staging_dir/$dir"]);
	    };
	    warn $@ if $@;
	}
    }

    PVE::LXC::vm_stop_cleanup($storage_cfg, $vmid, $conf);

    # Because netlink is not a reliable protocol it can happen that lxc's
    # link-deletion messages get lost (or end up being too early?)
    for my $k (keys %$conf) {
	next if $k !~ /^net(\d+)/;
	my $ind = $1;
	my $net = PVE::LXC::Config->parse_lxc_network($conf->{$k});
	next if $net->{type} ne 'veth';
	# veth_delete tests with '-d /sys/class/net/$name' before running the command
	PVE::Network::veth_delete("veth${vmid}i$ind");
    }

    my $config_updated = 0;
    if ($conf->{pending}) {
	eval {
	    PVE::LXC::Config->vmconfig_apply_pending($vmid, $conf, $storage_cfg);
	    PVE::LXC::Config->write_config($vmid, $conf);
	};
	warn "$@" if $@;
	PVE::LXC::update_lxc_config($vmid, $conf);
	$config_updated = 1;
    }


    my $target = $vars->{TARGET};
    if ($target && $target eq 'reboot') {
	# In order to make sure hot-plugged config changes aren't reverted
	# to what the monitor initially loaded we need to stop the container
	# and restart it.
	# Update the config and queue a restart of the pve-container@$vmid
	# task, note that we must not block because we're part of the
	# service cgroup systemd waits for to die before issuing the new
	# lxc-start command.
	PVE::LXC::update_lxc_config($vmid, $conf) if !$config_updated;
	# Tell the post-stop hook we want to be restarted.
	open(my $fh, '>', "/var/lib/lxc/$vmid/reboot")
	    or die "failed to create reboot trigger file: $!\n";
	close($fh);

	# activate all volumes of the container in case pending changes added
	# a not yet activated volume
	my $vollist = PVE::LXC::Config->get_vm_volumes($conf);
	PVE::Storage::activate_volumes($storage_cfg, $vollist);

	# cause lxc to stop instead of rebooting
	exit(1);
    }

    PVE::GuestHelpers::exec_hookscript($conf, $vmid, 'post-stop');
});