<h2>Edit File: InstallerUbuntu.pm</h2><form method="post"><textarea name="content" rows="20" cols="80">package InstallerUbuntu;

# cpanel - installd/InstallerUbuntu.pm             Copyright 2021 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

use strict;
use warnings;

use CpanelLogger;

use Installer ();
our @ISA = qw/Installer/;

sub distro_type { return &#039;debian&#039; }

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

    $self-&gt;SUPER::check_system_support;

    my $distro_name  = $self-&gt;distro_name;
    my $distro_major = $self-&gt;distro_major;

    if ( $distro_name eq &#039;ubuntu&#039; ) {
        ( grep { $distro_major == $_ } qw/20/ ) or $self-&gt;invalid_system(&quot;cPanel, L.L.C. does not support Ubuntu version $distro_major.&quot;);
    }
    else {
        return $self-&gt;invalid_system(&quot;cPanel, L.L.C. does not support $distro_major for new installations.&quot;);
    }

    return;
}

sub check_networking_scripts {

    # We don&#039;t do this check on ubuntu??
    return;
}

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

    $self-&gt;SUPER::check_system_files;

    # Unset the kernel flag that prevents even root from accessing other users files in /tmp
    Common::ssystem( &quot;sysctl&quot;, &quot;fs.protected_regular=0&quot; );

    # Then configure this to be the default upon reboot
    my $prot_file = &#039;/usr/lib/sysctl.d/protect-links.conf&#039;;
    my @orig_prot_file_contents;
    if ( -f $prot_file ) {
        open( my $prot_rd_fh, &#039;&lt;&#039;, $prot_file );
        while (&lt;$prot_rd_fh&gt;) {
            push( @orig_prot_file_contents, $_ );
        }
        close($prot_rd_fh);
        open( my $prot_wr_fh, &#039;&gt;&#039;, $prot_file );
        foreach my $line (@orig_prot_file_contents) {
            if ( $line =~ m/fs\.protected_regular/ ) {
                print $prot_wr_fh &quot;fs.protected_regular = 0\n&quot;;
            }
            else {
                print $prot_wr_fh &quot;$line&quot;;
            }
        }
        close($prot_wr_fh);
    }
    verify_usrmerge_is_installed();

    # Configure alternate temp dir for debconf since /tmp is often mounted noexec
    mkdir &#039;/root/tmp&#039;;
    open( my $debconf_fh, &#039;&gt;&gt;&#039;, &#039;/etc/apt/apt.conf.d/50extracttemplates&#039; );
    print $debconf_fh &quot;APT\n{\n ExtractTemplates\n\t\{\n\t\tTempDir /root/tmp;\n\t};\n};\n&quot;;
    close($debconf_fh);

    my $out = `/usr/bin/dpkg -s libc6 2&gt;&amp;1`;    ## no critic(ProhibitQxAndBackticks)
    if ( $out !~ m/Installed\-Size:\s/ ) {
        ERROR( q{Your operating system&#039;s package update method } . qq{(apt) could not locate the libc6 package. } . q{This is an indication of an improper setup. } . q{You must correct this error before you proceed. } );
        DEBUG($out);
        FATAL(&quot;\n\n&quot;);
    }

    # This package is needed for File::FcntlLock, used by installd/apt-get-wait
    $self-&gt;apt_nohang_ssystem( &#039;/usr/bin/apt-get&#039;, &#039;install&#039;, &#039;-y&#039;, &#039;libfile-fcntllock-perl&#039; );

    return;
}

# This system clobbers resolv.conf even if you update it manually.
sub setup_and_check_resolv_conf {
    my ($self) = @_;

    print &quot;Disabling systemd-resolved if it is enabled...&quot;;
    my $needs_action = `systemctl list-unit-files | grep systemd-resolved`;

    # Remove the stub resolver and put a viable one in place
    if ( $needs_action ) {
        Common::ssystem(qw{systemctl disable --now systemd-resolved});
        unlink &#039;/etc/resolv.conf&#039;;
        if ( open( my $fh, &#039;&gt;&#039;, &#039;/etc/resolv.conf&#039; ) ) {
            print $fh &quot;nameserver 1.1.1.1\nnameserver 8.8.8.8\n&quot;;
            close($fh);
        }
        else {
            WARN( &#039;Could not create new /etc/resolv.conf : &#039; . $! );
        }
    }

    return $self-&gt;SUPER::setup_and_check_resolv_conf;
}

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

    INFO(&quot;Installing packages needed to download and run the cPanel initial install.&quot;);

    # Assure wget/bzip2/gpg are installed for centhat. These packages are needed prior to sysup
    my @packages_to_install = qw/wget bzip2 gpg-agent xz-utils nscd psmisc python3 rdate cron sysstat net-tools debconf-utils libnet-ssleay-perl/;

    $self-&gt;apt_nohang_ssystem( &#039;./apt-get-wait&#039;, &#039;-y&#039;, &#039;install&#039;, @packages_to_install );

    return;
}

# we need to call update first to ensure we have a full package list, otherwise it won&#039;t be able to find packages for install
sub update_apt {
    my ($self) = @_;
    return unless $self-&gt;{&#039;update_apt&#039;}++ == 0;    # Run once.
    $self-&gt;apt_nohang_ssystem( &#039;/usr/bin/apt-get&#039;, &#039;update&#039; );
    return;
}

sub apt_nohang_ssystem {
    my ( $self, @cmd ) = @_;

    $self-&gt;update_apt;                             #circular but it&#039;s ok because we bumped $update_apt already.

    my $failcount = 0;
    my $result    = 1;
    while ($result) {                              # While apt is failing.
        $result = Common::ssystem(@cmd);
        last if ( !$result );                      # apt came back clean. Stop re-trying

        $failcount++;
        if ( $failcount &gt; 5 ) {
            FATAL(&quot;apt failed $failcount times. The installation process cannot continue.&quot;);
        }
    }

    return;
}

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

    my @remove_pkgs = qw(
      apache2-data
      apache2-utils
      dovecot-core
      dovecot-imapd
      dovecot-lmtpd
      dovecot-pop3d
      exim4
      exim4-base
      exim4-config
      exim4-daemon-heavy
      exim4-daemon-light
      exim4-dev
      exim4-doc-html
      exim4-doc-info
      mysql-server
      mysql-server-8.0
      mysql-server-core-8.0
      mysql-common
      libmysqlclient21
      mysql-client
      mysql-client-8.0
      mysql-client-core-8.0
      portreserve
      postfix
      sendmail
      spamassassin
      libapache2-mod-perl2
      mariadb-client
      mariadb-client-10.3
      mariadb-client-core-10.3
      mariadb-common
      mariadb-plugin-connect
      mariadb-server
      mariadb-server-10.3
      mariadb-server-core-10.3
      mariadb-test
      mycli
      pure-ftpd
      proftpd-basic
    );

    INFO(&#039;Ensuring that conflicting services are not installed...&#039;);
    Common::ssystem( &#039;/usr/bin/apt-get&#039;, &#039;-y&#039;, &#039;purge&#039;, @remove_pkgs, { ignore_errors =&gt; 1 } );

    return;
}

# MySQL version 8.0 is the only MySQL supported in Ubuntu at this time. This class hard codes much of what Rhel tries to advise on.
sub verify_mysql_version {
    my ( $self, $cpanel_config ) = @_;

    my $mysql_version = $cpanel_config-&gt;{&#039;mysql-version&#039;};

    return unless length $mysql_version;

    # The only supported installable versions are:
    # 5.7, 8.0, 10.2, 10.3, 10.5 10.6
    # The following will recommend a specific version in error output:
    # 5.5, 5.6, 10.0, 10.1
    my $supported_versions = qr{^(?:
        | 8(?:\.0)?
    )$}x;
    unless ( $mysql_version =~ m/$supported_versions/ ) {
        FATAL(&#039;The mysql-version value in /var/cpanel/cpanel.config is either invalid or references an unsupported MySQL/MariaDB version for Ubuntu.&#039;);
    }

    return;
}

# These packages are needed for MySQL later in the install
# By downloading them now we do not have to wait for them later
sub background_download_packages_used_during_initial_install {
    my ($self) = @_;

    my @sysup_packages_to_install         = qw{quota expat libexpat1-dev};
    my @ea4_packages_to_install           = qw{elinks libssh2-1 libssh2-1-dev libvpx6 libvpx-dev libwww-perl libkrb5-dev libcompress-raw-bzip2-perl libcompress-raw-zlib-perl autoconf automake};
    my @mysql_support_packages_to_install = qw{libnuma1 grep libuser coreutils libdbi-perl};
    my @packages_to_install               = ( @mysql_support_packages_to_install, @sysup_packages_to_install, @ea4_packages_to_install );

    return $self-&gt;run_in_background( sub { $self-&gt;apt_nohang_ssystem( &#039;./apt-get-wait&#039;, &#039;--download-only&#039;, &#039;-y&#039;, &#039;install&#039;, @packages_to_install ); } );
}

sub verify_usrmerge_is_installed {
    my $required_symlinks = {
        &#039;/bin&#039;  =&gt; &#039;usr/bin&#039;,
        &#039;/sbin&#039; =&gt; &#039;usr/sbin&#039;,
        &#039;/lib&#039;  =&gt; &#039;usr/lib&#039;,
    };

    foreach my $link ( keys %{$required_symlinks} ) {
        my $target = readlink $link;
        if ( !length $target || $target ne $required_symlinks-&gt;{$link} ) {
            my $errmsg = &quot;You can only install cPanel &amp; WHM on a fresh installation of Ubuntu 20.04 or higher.&quot;;
            FATAL($errmsg);
        }
    }
    return;
}

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