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Filename : snapshot_prep
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#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/snapshot_prep                   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::snapshot_prep;

use cPstrict;
use Cpanel::Imports;
use Cpanel::ImagePrep                 ();
use Cpanel::ImagePrep::Common         ();
use Cpanel::ImagePrep::Output         ();
use Cpanel::ImagePrep::Task::packages ();

use base 'Cpanel::HelpfulScript';
use constant _OPTIONS => ( 'yes', 'no-post-service', 'list-tasks', 'skip=s', 'only=s', 'instance-packages=s', 'delete-saved-copies' );

# Synopsis deliberately omits --yes from "Using the utility" so the warning must be read.

=head1 NAME

scripts/snapshot_prep

=head1 SYNOPSIS

=head2 WARNINGS -- READ BEFORE USING

B<DESTRUCTIVE>: 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.

B<LIMITED TO CPANEL & WHM>: This utility only handles cPanel & WHM and
any software distributed with it or actively managed by it. It does not
handle the various operating system components that also need preparation
for image creation. For everything else, including SSH host and authorized
keys, yum UUID, etc., you should use a tool like B<virt-sysprep>.

=head2 Using the utility

/usr/local/cpanel/scripts/snapshot_prep [--no-post-service][--list-tasks]
[[--skip | --only] task,...] [--instance-packages package,...]
[--delete-saved-copies]

Puts cPanel & WHM and related bundled software into an ideal state to
prepare it for use as a deployment image. Warns you if there are problems
with your image you might want to attend to prior to snapshotting.

Additional options:

--no-post-service: If specified, the on-first-boot service (similar to
cloud-init) will NOT be installed, and you will be required to manually
run post_snapshot on first boot of any instance. This is appropriate if
you have your own custom initialization routines and want to ensure that
the order in which tasks are performed is predictable.

--list-tasks: List the tasks that the script would perform.

--skip: A comma-delimited list of tasks to skip.

--only: A comma-delimited list of tasks to perform, skipping all other
tasks.

--instance-packages: A comma-delimited list of packages to install on
first boot. The main reason for using this option instead of installing
the packages directly on the template VM would be if the installation
process generates per-instance data which you do not want to save into
your images.

--delete-saved-copies: Delete backup copies of configuration files that
were saved when preparing for a snapshot.

NOTE: The following sets of options are mutually exclusive with others
from the same set:

=over

=item * --list-tasks, --yes, --delete-saved-copies

=item * --skip, --only

=back

=cut

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

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

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

    if ( ( grep { $self->getopt($_) } qw(list-tasks delete-saved-copies yes) ) > 1 ) {
        die $self->help('The --list-tasks, --yes, and --delete-saved-copies options are mutually exclusive.');
    }

    if ( $self->getopt('skip') && $self->getopt('only') ) {
        die $self->help('The --skip and --only options are mutually exclusive.');
    }

    if ( $self->getopt('list-tasks') ) {
        my ( $table, $cb ) = Cpanel::ImagePrep::Output->get_list_output_callback();
        print Cpanel::ImagePrep::list_tasks( output_callback => $cb );
        print $table->draw;
        return 0;
    }

    if ( $self->getopt('delete-saved-copies') ) {
        return Cpanel::ImagePrep::delete_saved_copies() ? 0 : 1;
    }

    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

    my @to_skip;
    if ( my $to_skip_csl = $self->getopt('skip') ) {
        @to_skip = split /,/, $to_skip_csl;
    }

    if ( my $only_csl = $self->getopt('only') ) {
        my %only = map { $_ => 1 } ( split /,/, $only_csl );
        Cpanel::ImagePrep::list_tasks(
            output_callback => sub {
                my ($task_obj) = @_;
                my $task = $task_obj->task_name;
                push @to_skip, $task if !$only{$task};
            }
        );
    }

    my $instance_packages_csl = $self->getopt('instance-packages');
    if ($instance_packages_csl) {
        my @instance_packages = split /,/, $instance_packages_csl;
        Cpanel::ImagePrep::Task::packages->new->request(@instance_packages);
    }

    my ( $table,  $cb )     = Cpanel::ImagePrep::Output->get_status_output_callback();
    my ( $status, $reason ) = Cpanel::ImagePrep::snapshot_prep(
        output_callback => $cb,
        skip            => \@to_skip,
    );

    my $skip_service = !$status || $self->getopt('no-post-service') || $ENV{DESTROY_CPANEL_USER_DATA};
    if ( !$skip_service ) {
        Cpanel::ImagePrep::install_post_service();
    }

    $common->raw_logmsg( $table->draw );
    $common->regular_logmsg($reason);

    if ($status) {
        $common->regular_logmsg('The rest of the operating system still needs preparation. You can use virt-sysprep or a similar utility to achieve this.');
        if ($skip_service) {
            $common->regular_logmsg('Warning: Because you disabled the on-first-boot service, you will have to run /usr/local/cpanel/scripts/post_snapshot yourself on any instances launched from a snapshot.');
        }
    }
    else {
        $common->regular_logmsg('See the output before the summary table for more detail about the failure(s).');
    }

    return $status ? 0 : 1;
}

1;