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: /scripts/ [ drwxr-xr-x ]
name : 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;