--- doc/install/linux/install.pl	2019/12/03 04:55:08	1.61
+++ doc/install/linux/install.pl	2021/03/18 21:37:19	1.72
@@ -29,6 +29,7 @@ use Term::ReadKey;
 use Socket;
 use Sys::Hostname::FQDN();
 use DBI;
+use File::Spec;
 use Cwd();
 use File::Basename();
 use lib File::Basename::dirname(Cwd::abs_path($0));
@@ -77,7 +78,7 @@ if (!open(LOG,">>loncapa_install.log"))
           &mt('Stopping execution.')."\n";
     exit;
 } else {
-    print LOG '$Id: install.pl,v 1.61 2019/12/03 04:55:08 raeburn Exp $'."\n";
+    print LOG '$Id: install.pl,v 1.72 2021/03/18 21:37:19 raeburn Exp $'."\n";
 }
 
 #
@@ -357,7 +358,7 @@ sub get_hostname {
 }
 
 #
-# get_hostname() prompts the user to provide the server's IPv4 IP address
+# get_hostip() prompts the user to provide the server's IPv4 IP address
 #
 # If invalid input is provided, the routine is called recursively 
 # until, a valid IPv4 address is provided.
@@ -421,23 +422,26 @@ sub check_prerequisites {
 
 sub check_locale {
     my ($distro) = @_;
-    my ($fh,$langvar,$command);
+    my ($fh,$langvar,$command,$earlyout);
     $langvar = 'LANG';
     if ($distro =~ /^(ubuntu|debian)/) {
         if (!open($fh,"</etc/default/locale")) {
             print &mt('Failed to open: [_1], default locale not checked.',
                       '/etc/default/locale');
+            $earlyout = 1;
         }
     } elsif ($distro =~ /^(suse|sles)(\d+)/) {
         if (($1 eq 'sles') && ($2 >= 15)) {
             if (!open($fh,"</etc/locale.conf")) {
                 print &mt('Failed to open: [_1], default locale not checked.',
                           '/etc/locale.conf');
+                $earlyout = 1;
             }
         } else {
             if (!open($fh,"</etc/sysconfig/language")) {
                 print &mt('Failed to open: [_1], default locale not checked.',
                           '/etc/sysconfig/language');
+                $earlyout = 1;
             }
             $langvar = 'RC_LANG';
         }
@@ -446,27 +450,33 @@ sub check_locale {
             if (!open($fh,"</etc/locale.conf")) {
                 print &mt('Failed to open: [_1], default locale not checked.',
                           '/etc/locale.conf');
+                $earlyout = 1;
             }
         } elsif (!open($fh,"</etc/sysconfig/i18n")) {
             print &mt('Failed to open: [_1], default locale not checked.',
                       '/etc/sysconfig/i18n');
+            $earlyout = 1;
         }
     } elsif ($distro =~ /^(?:rhes|centos|scientific|oracle)(\d+)/) {
         if ($1 >= 7) {
             if (!open($fh,"</etc/locale.conf")) {
                 print &mt('Failed to open: [_1], default locale not checked.',
                           '/etc/locale.conf');
+                $earlyout = 1;
             }
         } elsif (!open($fh,"</etc/sysconfig/i18n")) {
             print &mt('Failed to open: [_1], default locale not checked.',
                       '/etc/sysconfig/i18n');
+            $earlyout = 1;
         }
     } else {
         if (!open($fh,"</etc/sysconfig/i18n")) {
             print &mt('Failed to open: [_1], default locale not checked.',
                       '/etc/sysconfig/i18n');
+            $earlyout = 1;
         }
     }
+    return if ($earlyout);
     my @data = <$fh>;
     chomp(@data);
     foreach my $item (@data) {
@@ -510,9 +520,9 @@ sub check_required {
     unless ($localecmd eq '') {
         return ($distro,$gotprereqs,$localecmd);
     }
-    my ($mysqlon,$mysqlsetup,$mysqlrestart,$dbh,$has_pass,$has_lcdb,%recommended,
-        $downloadstatus,$filetouse,$production,$testing,$apachefw,$tostop,
-        $uses_systemctl,$hostname,$hostip);
+    my ($mysqlon,$mysqlsetup,$mysqlrestart,$dbh,$has_pass,$mysql_unix_socket,$has_lcdb,
+        %recommended,$downloadstatus,$filetouse,$production,$testing,$apachefw,
+        $tostop,$uses_systemctl,$mysql_has_wwwuser,$hostname,$hostip);
     my $wwwuid = &uid_of_www();
     my $wwwgid = getgrnam('www');
     if (($wwwuid eq '') || ($wwwgid eq '')) {
@@ -542,9 +552,8 @@ sub check_required {
     print_and_log("\n".&mt('Hostname is [_1] and IP address is [_2]',$hostname,$hostip)."\n");
     $mysqlon = &check_mysql_running($distro);
     if ($mysqlon) {
-        my $mysql_has_wwwuser = &check_mysql_wwwuser();
-        ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser) = 
-            &check_mysql_setup($instdir,$dsn,$distro,$mysql_has_wwwuser);
+        ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser,$mysql_unix_socket) =
+            &check_mysql_setup($instdir,$dsn,$distro);
         if ($mysqlsetup eq 'needsrestart') {
             $mysqlrestart = '';
             if ($distro eq 'ubuntu') {
@@ -578,10 +587,10 @@ sub check_required {
     ($recommended{'download'},$downloadstatus,$filetouse,$production,$testing) 
         = &need_download();
     return ($distro,$gotprereqs,$localecmd,$packagecmd,$updatecmd,$installnow,
-            $mysqlrestart,\%recommended,$dbh,$has_pass,$has_lcdb,$downloadstatus,
-            $filetouse,$production,$testing,$apachefw,$uses_systemctl,$hostname,
-            $hostip,$sslhostsfilesref,$has_std,$has_int,$rewritenum,$nochgstd,
-            $nochgint);
+            $mysqlrestart,\%recommended,$dbh,$has_pass,$mysql_unix_socket,
+            $has_lcdb,$downloadstatus,$filetouse,$production,$testing,$apachefw,
+            $uses_systemctl,$hostname,$hostip,$sslhostsfilesref,$has_std,$has_int,
+            $rewritenum,$nochgstd,$nochgint);
 }
 
 sub check_mysql_running {
@@ -974,10 +983,10 @@ sub chkapache {
         } else {
             my ($configfile,$sitefile);
             if (($distname eq 'ubuntu') && ($version > 12)) {
-                $sitefile = '/etc/apache2/sites-available/loncapa';
-                $configfile = "/etc/apache2/conf-available/loncapa";
+                $sitefile = '/etc/apache2/sites-available/loncapa.conf';
+                $configfile = '/etc/apache2/conf-available/loncapa.conf';
             } else {
-                $configfile = "/etc/apache2/sites-available/loncapa";
+                $configfile = '/etc/apache2/sites-available/loncapa';
             }
             if (($configfile ne '') && (-e $configfile) && (-e $stdconf))  {
                 if (open(PIPE, "diff --brief $stdconf $configfile |")) {
@@ -1009,6 +1018,20 @@ sub chkapache {
                 }
             }
         }
+        if ((!$fixapache) && ($distname eq 'ubuntu')) {
+            my $sitestatus = "/etc/apache2/mods-available/status.conf";
+            my $stdstatus = "$instdir/debian-ubuntu/status.conf";
+            if ((-e $stdstatus) && (-e $sitestatus)) {
+                if (open(PIPE, "diff --brief $stdstatus $sitestatus |")) {
+                    my $diffres = <PIPE>;
+                    close(PIPE);
+                    chomp($diffres);
+                    if ($diffres) {
+                        $fixapache = 1;
+                    }
+                }
+            }
+        }
     } elsif ($distro =~ /^(suse|sles)([\d\.]+)$/) {
         my ($name,$version) = ($1,$2);
         my $apache = 'apache';
@@ -1506,11 +1529,48 @@ sub need_download {
 }
 
 sub check_mysql_setup {
-    my ($instdir,$dsn,$distro,$mysql_has_wwwuser) = @_;
-    my ($mysqlsetup,$has_pass);
+    my ($instdir,$dsn,$distro) = @_;
+    my ($mysqlsetup,$has_pass,$mysql_unix_socket,$mysql_has_wwwuser);
     my $dbh = DBI->connect($dsn,'root','',{'PrintError'=>0});
+    my ($mysqlversion,$mysqlsubver,$mysqlname) = &get_mysql_version();
+    if (($mysqlname =~ /^MariaDB/i) && ($mysqlversion >= 10.4)) {
+        if ($dbh) {
+            my $sth = $dbh->prepare("SELECT Priv FROM mysql.global_priv WHERE (User = 'root' AND Host ='localhost')");
+            $sth->execute();
+            while (my $priv = $sth->fetchrow_array) {
+                if ($priv =~ /unix_socket/) {
+                    $mysql_unix_socket = 1;
+                    last;
+                }
+            }
+            $sth->finish();
+            if ($mysql_unix_socket) {
+                print_and_log(&mt('MariaDB using unix_socket for root access from localhost.')."\n");
+                $mysqlsetup = 'rootok';
+                $mysql_has_wwwuser = &check_mysql_wwwuser($dbh);
+                return ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser,$mysql_unix_socket);
+            }
+        }
+    }
     if ($dbh) {
-        $mysqlsetup = 'noroot'; 
+        $mysqlsetup = 'noroot';
+        if (($mysqlname !~ /^MariaDB/i) && ($mysqlversion >= 5.7)) {
+            my $sth = $dbh->prepare("SELECT plugin from mysql.user where User='root'");
+            $sth->execute();
+            while (my $priv = $sth->fetchrow_array) {
+                if ($priv =~ /auth_socket/) {
+                    $mysql_unix_socket = 1;
+                    last;
+                }
+            }
+            $sth->finish();
+            if ($mysql_unix_socket) {
+                print_and_log(&mt('MySQL using unix_socket for root access from localhost.')."\n");
+                $mysqlsetup = 'rootok';
+                $mysql_has_wwwuser = &check_mysql_wwwuser($dbh);
+                return ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser,$mysql_unix_socket);
+            }
+        }
     } elsif ($DBI::err =~ /1045/) {
         $has_pass = 1;
     } elsif ($distro =~ /^ubuntu(\d+)$/) {
@@ -1523,16 +1583,15 @@ sub check_mysql_setup {
                 }
                 close(PIPE);
             }
-            unless ($mysql_has_wwwuser) {
-                $mysql_has_wwwuser = &check_mysql_wwwuser();
-            }
             $dbh = DBI->connect($dsn,'root','',{'PrintError'=>0});
             if ($dbh) {
                 $mysqlsetup = 'noroot';
+                $mysql_has_wwwuser = &check_mysql_wwwuser($dbh);
             } elsif ($DBI::err =~ /1045/) {
                 $has_pass = 1;
             } else {
                 $mysqlsetup = 'needsrestart';
+                $mysql_has_wwwuser = &check_mysql_wwwuser();
                 return ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser);
             }
         }
@@ -1544,6 +1603,7 @@ sub check_mysql_setup {
         if ($dbh) {
             $mysqlsetup = 'rootok';
             print_and_log(&mt('Password accepted.')."\n");
+            $mysql_has_wwwuser = &check_mysql_wwwuser($dbh);
         } else {
             $mysqlsetup = 'rootfail';
             print_and_log(&mt('Problem accessing MySQL.')."\n");
@@ -1555,27 +1615,35 @@ sub check_mysql_setup {
                 if ($dbh) {
                     $mysqlsetup = 'rootok';
                     print_and_log(&mt('Password accepted.')."\n");
+                    $mysql_has_wwwuser = &check_mysql_wwwuser($dbh);
                 } else {
                     if ($DBI::err =~ /1045/) {
                         print_and_log(&mt('Incorrect password.')."\n");
                     }
+                    $mysql_has_wwwuser = &check_mysql_wwwuser();
                 }
             }
         }
     } elsif ($mysqlsetup ne 'noroot') {
         print_and_log(&mt('Problem accessing MySQL.')."\n");
         $mysqlsetup = 'rootfail';
+        $mysql_has_wwwuser = &check_mysql_wwwuser();
     }
     return ($mysqlsetup,$has_pass,$dbh,$mysql_has_wwwuser);
 }
 
 sub check_mysql_wwwuser {
+    my ($dbh) = @_;
     my $mysql_wwwuser;
-    my $dbhn = DBI->connect("DBI:mysql:database=information_schema",'www','localhostkey',
-                            {PrintError => +0}) || return;
-    if ($dbhn) {
-        $mysql_wwwuser = 1;
-        $dbhn->disconnect;
+    if ($dbh) {
+        $mysql_wwwuser = $dbh->selectrow_array("SELECT COUNT(User) FROM mysql.user WHERE (User = 'www' AND Host ='localhost')");
+    } else {
+        my $dbhn = DBI->connect("DBI:mysql:database=information_schema",'www','localhostkey',
+                                {PrintError => +0}) || return;
+        if ($dbhn) {
+            $mysql_wwwuser = 1;
+            $dbhn->disconnect;
+        }
     }
     return $mysql_wwwuser;
 }
@@ -1833,9 +1901,10 @@ print "\n".&mt('Checking system status .
 
 my $dsn = "DBI:mysql:database=mysql";
 my ($distro,$gotprereqs,$localecmd,$packagecmd,$updatecmd,$installnow,$mysqlrestart,
-    $recommended,$dbh,$has_pass,$has_lcdb,$downloadstatus,$filetouse,$production,
-    $testing,$apachefw,$uses_systemctl,$hostname,$hostip,$sslhostsfiles,$has_std,
-    $has_int,$rewritenum,$nochgstd,$nochgint) = &check_required($instdir,$dsn);
+    $recommended,$dbh,$has_pass,$mysql_unix_socket,$has_lcdb,$downloadstatus,
+    $filetouse,$production,$testing,$apachefw,$uses_systemctl,$hostname,$hostip,
+    $sslhostsfiles,$has_std,$has_int,$rewritenum,$nochgstd,$nochgint) =
+    &check_required($instdir,$dsn);
 if ($distro eq '') {
     print "\n".&mt('Linux distribution could not be verified as a supported distribution.')."\n".
           &mt('The following are supported: [_1].',
@@ -1877,9 +1946,10 @@ if (!$gotprereqs) {
                     exit;
                 } else {
                     ($distro,$gotprereqs,$localecmd,$packagecmd,$updatecmd,$installnow,
-                     $mysqlrestart,$recommended,$dbh,$has_pass,$has_lcdb,$downloadstatus,
-                     $filetouse,$production,$testing,$apachefw,$uses_systemctl) = 
-                     &check_required($instdir,$dsn);
+                     $mysqlrestart,$recommended,$dbh,$has_pass,$mysql_unix_socket,
+                     $has_lcdb,$downloadstatus,$filetouse,$production,$testing,$apachefw,
+                     $uses_systemctl,$hostname,$hostip,$sslhostsfiles,$has_std,$has_int,
+                     $rewritenum,$nochgstd,$nochgint) = &check_required($instdir,$dsn);
                 }
             } else {
                 print &mt('Failed to run command to install LONCAPA-prerequisites')."\n";
@@ -1976,7 +2046,8 @@ if ($callsub{'pwauth'}) {
 
 if ($callsub{'mysql'}) {
     if ($dbh) {
-        &setup_mysql($callsub{'mysqlperms'},$distro,$dbh,$has_pass,$has_lcdb);
+        &setup_mysql($callsub{'mysqlperms'},$dbh,$has_pass,
+                     $mysql_unix_socket,$has_lcdb);
     } else {
         print &mt('Unable to configure MySQL because access is denied.')."\n";
     }
@@ -1984,7 +2055,7 @@ if ($callsub{'mysql'}) {
     &print_and_log(&mt('Skipping configuration of MySQL.')."\n");
     if ($callsub{'mysqlperms'}) {
         if ($dbh) {
-            &setup_mysql_permissions($dbh,$has_pass);
+            &setup_mysql_permissions($dbh,$has_pass,$mysql_unix_socket);
         } else {
             print &mt('Unable to configure MySQL because access is denied.')."\n";  
         }
@@ -2099,14 +2170,16 @@ if ($callsub{'firewall'}) {
         if (keys(%added) > 0) {
             print &mt('Firewall configured to allow access for: [_1].',
                       join(', ',sort(keys(%added))))."\n";
+            system('firewall-cmd --reload'); 
         }
         if ($current{'http'} || $current{'https'}) {
             print &mt('Firewall already configured to allow access for:[_1].',
                       (($current{'http'})? ' http':'').(($current{'https'})? ' https':''))."\n";
         }
         unless ($current{'ssh'}) {
-            print &mt('If you would the like to allow access to ssh from outside, use the command[_1].',
-                  "firewall-cmd --permanent --zone=$zone --add-service=ssh")."\n";
+            print &mt('If you would like to allow access to ssh from outside, use the commands:')."\n".
+                  "firewall-cmd --permanent --zone=$zone --add-service=ssh\n".
+                  "firewall-cmd --reload\n";
         }
     } elsif ($distro =~ /^(suse|sles)/) {
         print &mt('Use [_1] to configure the firewall to allow access for [_2].',
@@ -2195,32 +2268,73 @@ if ($callsub{'download'}) {
 }
 
 print "\n".&mt('Requested configuration complete.')."\n\n";
-my $apachename;
 if ($have_tarball && !$updateshown) {
     my ($lcdir) = ($sourcetarball =~ /^([\w.\-]+)\.tar.gz$/);
+    my ($apachename,$lc_uses_systemctl,$uses_sudo);
+    if ($distro =~ /^(suse|sles|debian|ubuntu)([\d.]+)/) {
+        if (($1 eq 'suse') && ($2 < 10)) {
+            $apachename = 'apache';
+        } else {
+            $apachename = 'apache2';
+        }
+    } else {
+        $apachename = 'httpd';
+    }
+    if ($distro =~ /^oracle(\d+)$/) {
+        if ($1 > 6) {
+            $lc_uses_systemctl = 1;
+        }
+    } elsif ($distro =~ /^(?:rhes|centos)(\d+)$/) {
+        if ($1 > 7) {
+            $lc_uses_systemctl = 1;
+        }
+    } elsif ($distro =~ /^ubuntu(\d+)$/) {
+        if ($1 > 16) {
+            $lc_uses_systemctl = 1;
+        }
+        $uses_sudo = 1;
+    } elsif ($distro =~ /^sles(\d+)$/) {
+        if ($1 > 12) {
+            $lc_uses_systemctl = 1;
+        }
+    }
     if (!-e '/etc/loncapa-release') {
         print &mt('If you are now ready to install LON-CAPA, enter the following commands:')."\n\n";
     } else {
-        print &mt('If you are now ready to update LON-CAPA, enter the following commands:')."\n\n".
-                  "/etc/init.d/loncontrol stop\n";
-        if ($distro =~ /^(suse|sles|debian|ubuntu)([\d.]+)/) {
-            if (($1 eq 'suse') && ($2 < 10)) {
-                $apachename = 'apache';
-            } else {
-                $apachename = 'apache2';
-            }
-        } else {
-            $apachename = 'httpd';
+        my $lcstop = '/etc/init.d/loncontrol stop';
+        if ($lc_uses_systemctl) {
+            $lcstop = 'systemctl stop loncontrol';
+        }
+        my $apachestop = "/etc/init.d/$apachename stop";
+        if ($uses_systemctl) {
+            $apachestop = "systemctl stop $apachename";
+        }
+        if ($uses_sudo) {
+            $lcstop = 'sudo '.$lcstop;
+            $apachestop = 'sudo '.$apachestop;
         }
-        print "/etc/init.d/$apachename stop\n";
+        print &mt('If you are now ready to update LON-CAPA, enter the following commands:').
+              "\n\n$lcstop\n$apachestop\n";   
     }
     print "cd /root\n".
           "tar zxf $sourcetarball\n".
           "cd $lcdir\n".
           "./UPDATE\n";
     if (-e '/etc/loncapa-release') {
-        print "/etc/init.d/loncontrol start\n";
-        print "/etc/init.d/$apachename start\n";
+        my $lcstart = '/etc/init.d/loncontrol start';
+        if ($lc_uses_systemctl) {
+            $lcstart = '/home/httpd/perl/loncontrol start';
+        }
+        my $apachestart = "/etc/init.d/$apachename start";
+        if ($uses_systemctl) {
+            $apachestart = "systemctl start $apachename";
+        }
+        if ($uses_sudo) {
+            $lcstart = 'sudo '.$lcstart;
+            $apachestart = 'sudo '.$apachestart;
+        }
+        print "$lcstart\n";
+        print "$apachestart\n";
     }
 }
 exit;
@@ -2404,7 +2518,7 @@ sub kill_extra_services {
 }
 
 sub setup_mysql {
-    my ($setup_mysql_permissions,$distro,$dbh,$has_pass,$has_lcdb) = @_;
+    my ($setup_mysql_permissions,$dbh,$has_pass,$mysql_unix_socket,$has_lcdb) = @_;
     my @mysql_lc_commands;
     unless ($has_lcdb) {
         push(@mysql_lc_commands,"CREATE DATABASE loncapa");
@@ -2414,7 +2528,7 @@ sub setup_mysql {
 CREATE TABLE IF NOT EXISTS metadata (title TEXT, author TEXT, subject TEXT, url TEXT, keywords TEXT, version TEXT, notes TEXT, abstract TEXT, mime TEXT, language TEXT, creationdate DATETIME, lastrevisiondate DATETIME, owner TEXT, copyright TEXT, domain TEXT, dependencies TEXT, modifyinguser TEXT, authorspace TEXT, lowestgradelevel TEXT, highestgradelevel TEXT, standards TEXT, count INT, course INT, course_list TEXT, goto INT, goto_list TEXT, comefrom INT, comefrom_list TEXT, sequsage INT, sequsage_list TEXT, stdno INT, stdno_list TEXT, avetries FLOAT, avetries_list TEXT, difficulty FLOAT, difficulty_list TEXT, disc FLOAT, disc_list TEXT, clear FLOAT, technical FLOAT, correct FLOAT, helpful FLOAT, depth FLOAT, hostname TEXT, FULLTEXT idx_title (title), FULLTEXT idx_author (author), FULLTEXT idx_subject (subject), FULLTEXT idx_url (url), FULLTEXT idx_keywords (keywords), FULLTEXT idx_version (version), FULLTEXT idx_notes (notes), FULLTEXT idx_abstract (abstract), FULLTEXT idx_mime (mime), FULLTEXT idx_language (language), FULLTEXT idx_owner (owner), FULLTEXT idx_copyright (copyright)) ENGINE=MYISAM
 });
     if ($setup_mysql_permissions) {
-        &setup_mysql_permissions($dbh,$has_pass,@mysql_lc_commands);
+        &setup_mysql_permissions($dbh,$has_pass,$mysql_unix_socket,@mysql_lc_commands);
     } else {
         print_and_log(&mt('Skipping MySQL permissions setup.')."\n");
         if ($dbh) {
@@ -2431,12 +2545,14 @@ CREATE TABLE IF NOT EXISTS metadata (tit
 }
 
 sub setup_mysql_permissions {
-    my ($dbh,$has_pass,@mysql_lc_commands) = @_;
+    my ($dbh,$has_pass,$mysql_unix_socket,@mysql_lc_commands) = @_;
     my ($mysqlversion,$mysqlsubver,$mysqlname) = &get_mysql_version();
-    my ($usesauth,$is_mariadb,$hasauthcol,@mysql_commands);
+    my ($usescreate,$usesauth,$is_mariadb,$hasauthcol,@mysql_commands);
     if ($mysqlname =~ /^MariaDB/i) {
         $is_mariadb = 1;
-        if ($mysqlversion >= 10.2) {
+        if ($mysqlversion >= 10.4) {
+            $usescreate = 1;
+        } elsif ($mysqlversion >= 10.2) {
             $usesauth = 1;
         } elsif ($mysqlversion >= 5.5) {
             $hasauthcol = 1;
@@ -2448,7 +2564,9 @@ sub setup_mysql_permissions {
             $hasauthcol = 1;
         }
     }
-    if ($usesauth) {
+    if ($usescreate) {
+        @mysql_commands = ("CREATE USER 'www'\@'localhost' IDENTIFIED BY 'localhostkey'");
+    } elsif ($usesauth) {
         @mysql_commands = ("INSERT user (Host, User, ssl_cipher, x509_issuer, x509_subject, authentication_string) VALUES('localhost','www','','','','')");
         if ($is_mariadb) {
             push(@mysql_commands,"ALTER USER 'www'\@'localhost' IDENTIFIED BY 'localhostkey'");
@@ -2468,7 +2586,7 @@ INSERT db (Host,Db,User,Select_priv,Inse
 INSERT db (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv,Grant_priv,References_priv,Index_priv,Alter_priv,Create_tmp_table_priv,Lock_tables_priv) VALUES('localhost','loncapa','www','Y','Y','Y','Y','Y','Y','N','Y','Y','Y','Y','Y')");
     }
     push(@mysql_commands,"DELETE FROM user WHERE host<>'localhost'");
-    if ($has_pass) {
+    if (($has_pass) || ($mysql_unix_socket)) {
         if ($dbh) {
             push(@mysql_commands,"FLUSH PRIVILEGES");
             if (@mysql_commands) {
@@ -2560,7 +2678,7 @@ sub get_mysql_version {
         my $info = <PIPE>;
         chomp($info);
         close(PIPE);
-        ($version,$subversion,$name) = ($info =~ /(\d+\.\d+)\.(\d+)\-?(\w*),/);
+        ($version,$subversion,$name) = ($info =~ /(\d+\.\d+)\.(\d+)(?:\-?(\w*),|)/);
     } else {
         print &mt('Could not determine which version of MySQL is installed.').
               "\n";
@@ -3140,6 +3258,7 @@ sub copy_apache2_debconf {
     my $apache2_sites_enabled_dir = '/etc/apache2/sites-enabled';
     my $apache2_sites_available_dir = '/etc/apache2/sites-available';
     my $defaultconfig = "$apache2_sites_enabled_dir/000-default";
+    my $defaultsite = "$apache2_sites_enabled_dir/loncapa.conf";
     my ($distname,$version);
     if ($distro =~ /^(debian|ubuntu)(\d+)$/) {
         $distname = $1;
@@ -3148,35 +3267,182 @@ sub copy_apache2_debconf {
     if (($distname eq 'ubuntu') && ($version > 12)) {
         $defaultconfig = "$apache2_sites_enabled_dir/000-default.conf";
     }
-    if (-l $defaultconfig) {
-        unlink($defaultconfig);
-    }
+    my ($skipconf,$skipsite,$skipstatus);
     if (($distname eq 'ubuntu') && ($version > 12)) {
-        print_and_log(&mt('Copying loncapa [_1] config file to [_2] and pointing [_3] to it from conf-enabled.',"'apache2'","'/etc/apache2/conf-available'","'loncapa.conf symlink'")."\n");
         my $apache2_conf_enabled_dir = '/etc/apache2/conf-enabled';
         my $apache2_conf_available_dir = '/etc/apache2/conf-available';
-        if (-e "$apache2_conf_available_dir/loncapa") {
-            copy("$apache2_conf_available_dir/loncapa","$apache2_conf_available_dir/loncapa.original");
-        }
         my $defaultconf = $apache2_conf_enabled_dir.'/loncapa.conf';
-        copy("$instdir/debian-ubuntu/ubuntu14/loncapa_conf","$apache2_conf_available_dir/loncapa");
-        chmod(0444,"$apache2_conf_available_dir/loncapa");
-        if (-l $defaultconf) {
-            unlink($defaultconf);
-        }
-        symlink("$apache2_conf_available_dir/loncapa","$defaultconf");
-        print_and_log(&mt('Copying loncapa [_1] site file to [_2] and pointing [_3] to it from sites-enabled.',"'apache2'","'/etc/apache2/sites-available'","'000-default.conf symlink'")."\n");
-        copy("$instdir/debian-ubuntu/ubuntu14/loncapa_site","$apache2_sites_available_dir/loncapa");
-        chmod(0444,"$apache2_sites_available_dir/loncapa");
-        symlink("$apache2_sites_available_dir/loncapa","$defaultconfig");
-    } else {
-        print_and_log(&mt('Copying loncapa [_1] config file to [_2] and pointing [_3] to it from sites-enabled.',"'apache2'","'/etc/apache2/sites-available'","'000-default symlink'")."\n");
-        if (-e "$apache2_sites_available_dir/loncapa") {
-            copy("$apache2_sites_available_dir/loncapa","$apache2_sites_available_dir/loncapa.original");
-        }
-        copy("$instdir/debian-ubuntu/loncapa","$apache2_sites_available_dir/loncapa");
-        chmod(0444,"$apache2_sites_available_dir/loncapa");
-        symlink("$apache2_sites_available_dir/loncapa","$apache2_sites_enabled_dir/000-default");
+        if ((-e "$apache2_conf_available_dir/loncapa") && (-e "$instdir/debian-ubuntu/ubuntu14/loncapa_conf")) {
+            if (open(PIPE, "diff --brief $apache2_conf_available_dir/loncapa $instdir/debian-ubuntu/ubuntu14/loncapa_conf |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_conf_available_dir/loncapa","$apache2_conf_available_dir/loncapa.conf.original");
+                } else {
+                    copy("$apache2_conf_available_dir/loncapa","$apache2_conf_available_dir/loncapa.conf");
+                    chdir($apache2_conf_enabled_dir);
+                    symlink('../conf-available/loncapa.conf','loncapa.conf');
+                    chdir($instdir);
+                }
+                if (-l $defaultconf) {
+                    my $linkfname = readlink($defaultconf);
+                    if ($linkfname ne '') {
+                        $linkfname = Cwd::abs_path(File::Spec->rel2abs($linkfname,$apache2_conf_enabled_dir));
+                    }
+                    if ($linkfname eq "$apache2_conf_available_dir/loncapa") {
+                        unlink($defaultconf);
+                    }
+                }
+                unlink("$apache2_conf_available_dir/loncapa");
+            }
+        }
+        if ((-e "$apache2_conf_available_dir/loncapa.conf") && (-e "$instdir/debian-ubuntu/ubuntu14/loncapa_conf")) {
+            if (open(PIPE, "diff --brief $apache2_conf_available_dir/loncapa.conf $instdir/debian-ubuntu/ubuntu14/loncapa_conf |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_conf_available_dir/loncapa.conf","$apache2_conf_available_dir/loncapa.conf.original");
+                }
+                if (-l $defaultconf) {
+                    my $linkfname = readlink($defaultconf);
+                    if ($linkfname ne '') {
+                        $linkfname = Cwd::abs_path(File::Spec->rel2abs($linkfname,$apache2_conf_enabled_dir));
+                    }
+                    if ($linkfname eq "$apache2_conf_available_dir/loncapa.conf") {
+                        unless ($diffres) {
+                            $skipconf = 1;
+                        }
+                    }
+                }
+            }
+        }
+        unless ($skipconf) {
+            print_and_log(&mt('Copying loncapa [_1] config file to [_2] and pointing [_3] to it from conf-enabled.',"'apache2'","'/etc/apache2/conf-available'","'loncapa.conf symlink'")."\n");
+            copy("$instdir/debian-ubuntu/ubuntu14/loncapa_conf","$apache2_conf_available_dir/loncapa.conf");
+            chmod(0444,"$apache2_conf_available_dir/loncapa.conf");
+            if (-l $defaultconf) {
+                unlink($defaultconf);
+            }
+            chdir($apache2_conf_enabled_dir);
+            symlink('../conf-available/loncapa.conf','loncapa.conf');
+            chdir($instdir);
+        }
+        my $stdsite = "$instdir/debian-ubuntu/ubuntu14/loncapa_site";
+        if ((-e $stdsite) && (-e "$apache2_sites_available_dir/loncapa")) {
+            if (open(PIPE, "diff --brief $stdsite $apache2_sites_available_dir/loncapa |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_sites_available_dir/loncapa","$apache2_sites_available_dir/loncapa.conf.original");
+                } else {
+                    copy("$apache2_sites_available_dir/loncapa","$apache2_sites_available_dir/loncapa.conf");
+                }
+                if (-l $defaultconfig) {
+                    my $linkfname = readlink($defaultconfig);
+                    if ($linkfname ne '') {
+                        $linkfname = Cwd::abs_path(File::Spec->rel2abs($linkfname,$apache2_sites_enabled_dir));
+                    }
+                    if ($linkfname eq "$apache2_sites_available_dir/loncapa") {
+                        unlink($defaultconfig);
+                    }
+                }
+                unlink("$apache2_sites_available_dir/loncapa");
+            }
+        }
+        if ((-e $stdsite) && (-e "$apache2_sites_available_dir/loncapa.conf")) {
+            if (open(PIPE, "diff --brief $stdsite $apache2_sites_available_dir/loncapa.conf |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_sites_available_dir/loncapa.conf","$apache2_sites_available_dir/loncapa.conf.original");
+                }
+                if (-l $defaultsite) {
+                    my $linkfname = readlink($defaultsite);
+                    if ($linkfname ne '') {
+                        $linkfname = Cwd::abs_path(File::Spec->rel2abs($linkfname,$apache2_sites_enabled_dir));
+                    }
+                    if ($linkfname eq "$apache2_sites_available_dir/loncapa.conf") {
+                        unless ($diffres) {
+                            $skipsite = 1;
+                        }
+                    }
+                }
+            }
+        }
+        unless ($skipsite) {
+            print_and_log(&mt('Copying loncapa [_1] site file to [_2] and pointing [_3] to it from sites-enabled.',"'apache2'","'/etc/apache2/sites-available'","'loncapa.conf symlink'")."\n");
+            copy("$instdir/debian-ubuntu/ubuntu14/loncapa_site","$apache2_sites_available_dir/loncapa.conf");
+            chmod(0444,"$apache2_sites_available_dir/loncapa.conf");
+            chdir($apache2_sites_enabled_dir);
+            symlink('../sites-available/loncapa.conf','loncapa.conf');
+            chdir($instdir);
+        }
+        if (-l $defaultconfig) {
+            my $linkfname = readlink($defaultconfig);
+            if ($linkfname ne '') {
+                $linkfname = Cwd::abs_path(File::Spec->rel2abs($linkfname,$apache2_sites_enabled_dir));
+            }
+            if ($linkfname eq "$apache2_sites_available_dir/000-default.conf") {
+                unlink($defaultconfig);
+            }
+        }
+    } else {
+        if ((-e "$instdir/debian-ubuntu/loncapa") && (-e "$apache2_sites_available_dir/loncapa")) {
+            if (open(PIPE, "diff --brief $instdir/debian-ubuntu/loncapa $apache2_sites_available_dir/loncapa |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_sites_available_dir/loncapa","$apache2_sites_available_dir/loncapa.original");
+                }
+                if (-l $defaultconfig) {
+                    my $linkfname = readlink($defaultconfig);
+                    if ($linkfname eq "$apache2_sites_available_dir/loncapa") {
+                        unless ($diffres) {
+                            $skipsite = 1;
+                        }
+                    }
+                }
+            }
+        }
+        unless ($skipsite) {
+            if (-l $defaultconfig) {
+                unlink($defaultconfig);
+            }
+            print_and_log(&mt('Copying loncapa [_1] config file to [_2] and pointing [_3] to it from sites-enabled.',"'apache2'","'/etc/apache2/sites-available'","'000-default symlink'")."\n");
+            if (-e "$instdir/debian-ubuntu/loncapa") {
+                copy("$instdir/debian-ubuntu/loncapa","$apache2_sites_available_dir/loncapa");
+                chmod(0444,"$apache2_sites_available_dir/loncapa");
+                symlink("$apache2_sites_available_dir/loncapa","$apache2_sites_enabled_dir/000-default");
+            }
+        }
+    }
+    if ($distname eq 'ubuntu') {
+        my $sitestatus = "$apache2_mods_available_dir/status.conf";
+        my $stdstatus = "$instdir/debian-ubuntu/status.conf";
+        if ((-e $sitestatus) && (-e $stdstatus)) {
+            if (open(PIPE, "diff --brief $stdstatus $sitestatus |")) {
+                my $diffres = <PIPE>;
+                close(PIPE);
+                chomp($diffres);
+                if ($diffres) {
+                    copy("$apache2_mods_available_dir/status.conf","$apache2_mods_available_dir/status.conf.original");
+                } else {
+                    $skipstatus = 1;
+                }
+            }
+        }
+        unless ($skipstatus) {
+            if (-e $stdstatus) {
+                print_and_log(&mt('Copying loncapa [_1] file to [_2],',"'status.conf'","'/etc/apache2/mods-available/status.conf'")."\n");
+                copy($stdstatus,$sitestatus);
+                chmod(0644,$sitestatus);
+            }
+        }
     }
     print_and_log("\n");
 }
@@ -3376,7 +3642,7 @@ wget http://install.loncapa.org/versions
         print &mt('LON-CAPA source files extracted.')."\n".
               &mt('It remains for you to execute the following commands:')."
 
-cd /root/loncapa-N.N     (N.N should correspond to a version number like '0.4')
+cd /root/loncapa-X.Y.Z     (X.Y.Z should correspond to a version number like '2.11.3')
 ./UPDATE
 
 ".&mt('If you have any trouble, please see [_1] and [_2]',