晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //scripts/post_snapshot
#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/post_snapshot                   Copyright 2022 cPanel, L.L.C.
#                                                           All rights reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

package scripts::post_snapshot;

use cPstrict;
use Cpanel::Imports;
use Cpanel::ImagePrep             ();
use Cpanel::ImagePrep::Common     ();
use Cpanel::ImagePrep::Output     ();
use Cpanel::Systemd::Notify::Boot ();

use base 'Cpanel::HelpfulScript';
use constant _OPTIONS => ( 'yes', 'systemd' );

=head1 NAME

scripts/post_snapshot

=head1 SYNOPSIS

/usr/local/cpanel/scripts/post_snapshot [--systemd]

B<WARNING>: This is a destructive action. If you run this script on a production
server, data loss will occur. Pass the --yes option to acknowledge that you
understand this warning. If any cPanel users are detected, further confirmation
will be required.

Updates the running system with changes needed after it starts from a snapshot,
presumably to be a different IP address and hostname.

This script will abort and exit non-zero if one or more operations attempted
during post_snapshot fail.

If this script exits nonzero when used according to the documentation, you
should consider the server potentially damaged and unusable.

=cut

exit __PACKAGE__->new(@ARGV)->run unless caller;

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

    if ( $self->getopt('systemd') ) {
        sdnotify()->enable();
    }

    return $self->_run();
}

sub _run {    # returns exit code, not boolean
    my ($self) = @_;

    my $common = Cpanel::ImagePrep::Common->new();

    if ( !$self->getopt('yes') ) {
        die $self->help('Please read the warning in the usage output before using this script.');
    }

    local $| = 1;    # helps the test suite stream_cmd method

    sdnotify()->ready_and_wait_for_boot_to_finish(
        {
            # logs 'Waiting for the system to finish booting...', if a boot wait occurs.
            'waiting_callback' => sub ($msg) { return Cpanel::ImagePrep::common()->regular_logmsg($msg); },
        }
    );
    Cpanel::ImagePrep::delete_post_service();

    my ( $table, $cb ) = Cpanel::ImagePrep::Output->get_status_output_callback();
    my ( $ok, $reason );
    sdnotify()->disable_for_cr(
        sub {
            # When running as post_snapshot.service, some tasks and/or service
            # restarts may trigger unexpected notifications to systemd. This
            # doesn't cause failures but systemd logs warnings when this
            # occurs. Wrapping this in sdnotify->disable_for_cr silences the
            # spurious notifications.
            ( $ok, $reason ) = Cpanel::ImagePrep::post_snapshot(
                output_callback => $cb,
            );
        }
    );
    $common->raw_logmsg( $table->draw );
    $common->regular_logmsg($reason);

    if ( !$ok ) {
        $common->regular_logmsg('See the output before the summary table for more detail about the failure(s).');
    }
    return $ok ? 0 : 1;
}

sub sdnotify {
    return Cpanel::Systemd::Notify::Boot->get_instance( 'service' => 'post_snapshot' );
}

1;

haha - 2025