--- doc/install/linux/install.pl	2019/10/14 14:14:51	1.45.2.4
+++ doc/install/linux/install.pl	2020/05/03 00:48:28	1.45.2.7
@@ -75,7 +75,7 @@ if (!open(LOG,">>loncapa_install.log"))
           &mt('Stopping execution.')."\n";
     exit;
 } else {
-    print LOG '$Id: install.pl,v 1.45.2.4 2019/10/14 14:14:51 raeburn Exp $'."\n";
+    print LOG '$Id: install.pl,v 1.45.2.7 2020/05/03 00:48:28 raeburn Exp $'."\n";
 }
 
 #
@@ -357,23 +357,26 @@ 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;
             }
             $langvar = 'RC_LANG';
         }
@@ -382,27 +385,33 @@ sub check_locale {
             if (!open($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 $item (@data) {
@@ -645,6 +654,9 @@ sub chkconfig {
         if (($distro =~ /^ubuntu/) && ($version <= 8)) {
             $daemon{'cups'} = 'cupsys';
         }
+        if (($distro =~ /^ubuntu/) && ($version >= 18)) {
+            $daemon{'ntp'}    = 'chrony';
+        }
     } elsif ($distro =~ /^fedora(\d+)/) {
         my $version = $1;
         if ($version >= 15) {
@@ -659,6 +671,9 @@ sub chkconfig {
         if ($version >= 19) {
             $daemon{'mysql'} = 'mariadb';
         }
+        if ($version >= 26) {
+            $daemon{'ntp'} = 'chronyd';
+        }
     } elsif ($distro =~ /^(?:centos|rhes|scientific|oracle)(\d+)/) {
         my $version = $1;
         if ($version >= 7) {
@@ -914,6 +929,20 @@ 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';
@@ -953,6 +982,7 @@ sub chkapache {
         }
     } else {
         my $configfile = 'httpd.conf';
+        my $mpmfile = 'mpm.conf';
         if ($distro =~ /^(?:centos|rhes|scientific|oracle)(\d+)$/) {
             if ($1 >= 7) {
                 $configfile = 'apache2.4/httpd.conf';
@@ -961,7 +991,7 @@ sub chkapache {
             }
         } elsif ($distro =~ /^fedora(\d+)$/) {
             if ($1 > 17) {
-                $configfile = 'apache2.4/httpd.conf'; 
+                $configfile = 'apache2.4/httpd.conf';
             } elsif ($1 > 10) {
                 $configfile = 'new/httpd.conf';
             }
@@ -979,6 +1009,20 @@ sub chkapache {
                 }
             }
         }
+        if (-e "/etc/httpd/conf.modules.d/00-mpm.conf") {
+            if (!-e "$instdir/centos-rhes-fedora-sl/$mpmfile") {
+                print &mt('Warning: No LON-CAPA Apache MPM configuration file found for installation check.')."\n";
+            } elsif ((-e "/etc/httpd/conf.modules.d/00-mpm.conf") && (-e "$instdir/centos-rhes-fedora-sl/$mpmfile")) {
+                if (open(PIPE, "diff --brief $instdir/centos-rhes-fedora-sl/$mpmfile /etc/httpd/conf.modules.d/00-mpm.conf |")) {
+                    my $diffres = <PIPE>;
+                    close(PIPE);
+                    chomp($diffres);
+                    if ($diffres) {
+                        $fixapache = 1;
+                    }
+                }
+            }
+        }
     }
     return $fixapache;
 }
@@ -1607,6 +1651,7 @@ if ($callsub{'apache'}) {
         &copy_apache2_debconf($instdir,$distro);
     } else {
         &copy_httpd_conf($instdir,$distro);
+        &copy_mpm_conf($instdir,$distro);
     }
 } else {
     print_and_log(&mt('Skipping configuration of Apache web server.')."\n");
@@ -2123,7 +2168,7 @@ 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";
@@ -2162,6 +2207,50 @@ sub copy_httpd_conf {
     print_and_log("\n");
 }
 
+###########################################################
+##
+## RHEL/CentOS/Fedora/Scientific Linux
+## Copy LON-CAPA mpm.conf to /etc/httpd/conf.modules.d/00-mpm.conf
+##
+## The LON-CAPA mpm.conf enables the prefork MPM module in
+## Apache. This is also the default for RHEL/CentOS/Oracle
+## Linux 7 and earlier, and Fedora 26 and earlier. For more
+## recent versions of those distros, the event MPM is enabled
+## by default. After &copy_mpm_conf() is run, the prefork MPM
+## module will be enabled instead of the event MPM module.
+##
+###########################################################
+
+sub copy_mpm_conf {
+    my ($instdir,$distro) = @_;
+    my $mpmfile = 'mpm.conf';
+    if ((-e "/etc/httpd/conf.modules.d/00-mpm.conf") &&
+        (-e "$instdir/centos-rhes-fedora-sl/$mpmfile")) {
+        print_and_log(&mt('Copying the LON-CAPA [_1] to [_2].',"'mpm.conf'",
+                      "'/etc/httpd/conf.modules.d/00-mpm.conf'")."\n");
+        copy "$instdir/centos-rhes-fedora-sl/$mpmfile","/etc/httpd/conf.modules.d/00-mpm.conf";
+        chmod(0644,"/etc/httpd/conf.modules.d/00-mpm.conf");
+        print_and_log("\n");
+    } else {
+        my $logfail;
+        if ($distro =~ /^(?:centos|rhes|scientific|oracle)(\d+)$/) {
+            if ($1 > 7) {
+                $logfail = 1;
+            }
+        } elsif ($distro =~ /^fedora(\d+)$/) {
+            if ($1 > 26) {
+                $logfail = 1;
+            }
+        }
+        if ($logfail) {
+            print_and_log(&mt('Warning: copying the LON-CAPA [_1] failed because [_2] and/or [_3] are missing.',
+                              $mpmfile,"'$instdir/centos-rhes-fedora-sl/$mpmfile'",
+                              "'/etc/httpd/conf.modules.d/00-mpm.conf'"));
+            print_and_log("\n");
+        }
+    }
+}
+
 #########################################################
 ##
 ## Ubuntu/Debian -- copy our loncapa configuration file to
@@ -2190,35 +2279,116 @@ sub copy_apache2_debconf {
     if (($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.original");
+                }
+                if (-l $defaultconf) {
+                    my $linkfname = readlink($defaultconf);
+                    if ($linkfname eq "$apache2_conf_available_dir/loncapa") {
+                        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");
+            chmod(0444,"$apache2_conf_available_dir/loncapa");
+            if (-l $defaultconf) {
+                unlink($defaultconf);
+            }
+            symlink("$apache2_conf_available_dir/loncapa","$defaultconf");
+        }
+        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.original");
+                }
+                if (-l $defaultconfig) {
+                    my $linkfname = readlink($defaultconfig);
+                    if ($linkfname eq "$apache2_sites_available_dir/loncapa") {
+                        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'","'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","$defaultconfig");
+        }
+    } else {
+        if ((-e "$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");
 }
@@ -2418,7 +2588,7 @@ 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]',