sub preview()

in build_docs.pl [794:845]

• 48 lines of code
• 7 McCabe index (conditional complexity)

sub preview {
#===================================
    $Opts->{target_repo} = 'git@github.com:elastic/built-docs.git' unless ( $Opts->{target_repo} );

    my $nginx_config = file('/tmp/nginx.conf');
    write_nginx_preview_config( $nginx_config );

    if ( my $nginx_pid = fork ) {
        my ( $repos_dir, $temp_dir, $reference_dir ) = init_dirs();

        my $target_repo;
        unless ( $Opts->{gapped} ) {
            say "Cloning built docs";
            $target_repo = init_target_repo( $repos_dir, $temp_dir, $reference_dir );
        }
        say "Built docs are ready";

        my $default_template = $Opts->{gapped} ? "air_gapped_template.html" : "template.html";
        my $preview_pid = start_preview(
            'git', '/docs_build/.repos/target_repo.git', $default_template, $Opts->{gapped}
        );
        $SIG{TERM} = sub {
            # We should be a good citizen and shut down the subprocesses.
            # This isn't so important in k8s or docker because we shoot
            # the entire container when we're done, but it is nice when
            # testing.
            say 'Terminating preview services...nginx';
            kill 'TERM', $nginx_pid;
            wait;
            say 'Terminating preview services...preview';
            kill 'TERM', $preview_pid;
            wait;
            say 'Terminated preview services';
            exit 0;
        };
        if ( $Opts->{gapped} ) {
            wait;
        } else {
            while (1) {
                sleep 1;
                my $fetch_result = eval { $target_repo->fetch };
                say $fetch_result if $fetch_result;
                say $@ if $@;
            }
        }
        exit;
    } else {
        close STDIN;
        open( STDIN, "</dev/null" );
        exec( qw(nginx -c), $nginx_config );
    }
}