--- loncom/build/distprobe	2004/10/26 19:45:57	1.6
+++ loncom/build/distprobe	2021/12/20 03:13:29	1.25
@@ -2,7 +2,7 @@
 #
 # The LearningOnline Network with CAPA
 #
-# $Id: distprobe,v 1.6 2004/10/26 19:45:57 albertel Exp $
+# $Id: distprobe,v 1.25 2021/12/20 03:13:29 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -28,7 +28,16 @@
 #
 
 my $dist='default';
-if (-e '/etc/redhat-release') {
+my $unknown;
+if (-e '/etc/oracle-release') {
+    open(IN,'</etc/oracle-release');
+    my $versionstring=<IN>;
+    chomp($versionstring);
+    close(IN);
+    if ($versionstring =~ /^Oracle Linux Server release (\d+)/) {
+        $dist = 'oracle'.$1;
+    }
+} elsif (-e '/etc/redhat-release') {
     open(IN,'</etc/redhat-release');
     my $versionstring=<IN>;
     chomp($versionstring);
@@ -42,34 +51,116 @@ if (-e '/etc/redhat-release') {
         } elsif ($version=~/^9/) {
             $dist='redhat9';
         }
-    } elsif ($versionstring =~ /Fedora Core release ([\d\.]+) /) {
-        $dist = 'fedora'.$1;
+    } elsif ($versionstring =~ /Fedora( Core)? release ([\d\.]+) /) {
+	my $version=$2;
+	if ($version - int($version) > .9) {
+	    $dist = 'fedora'.(int($version)+1);
+	} else {
+	    $dist = 'fedora'.int($version);
+	}
+    } elsif ($versionstring =~ /Red Hat Enterprise Linux [AE]S release ([\d\.]+) /) {
+        $dist = 'rhes'.$1;
+    } elsif ($versionstring =~ /Red Hat Enterprise Linux Server release (\d+)/) {
+        $dist = 'rhes'.$1;
+    } elsif ($versionstring =~ /Red Hat Enterprise Linux release (\d+)/) {
+        $dist = 'rhes'.$1;
+    } elsif ($versionstring =~ /CentOS(?:| Linux| Stream) release (\d+)/) {
+        $dist = 'centos'.$1;
+    } elsif ($versionstring =~ /Scientific Linux (?:SL )?release ([\d.]+) /) {
+        my $ver = $1;
+        $ver =~ s/\.\d+$//;
+        $dist = 'scientific'.$ver;
+    } elsif ($versionstring =~ /Rocky Linux release ([\d.]+)/) {
+        my $ver = $1;
+        $ver =~ s/\.\d+$//;
+        $dist = 'rocky'.$ver;
+    } elsif ($versionstring =~ /AlmaLinux release ([\d.]+)/) {
+        my $ver = $1;
+        $ver =~ s/\.\d+$//;
+        $dist = 'alma'.$ver;
     } else {
         warn('Unable to interpret /etc/redhat-release '.
              'to determine system type');
-    }
-} elsif (-e '/etc/debian_version') {
-    open(IN,'</etc/debian_version');
-    my $version=<IN>;
-    chomp($version);
-    close(IN);
-    if ($version eq '2.2') {
-	$dist='debian2.2';
+        $unknown = 1;
     }
 } elsif (-e '/etc/SuSE-release') {
     open(IN,'</etc/SuSE-release');
     my $versionstring=<IN>;
     chomp($versionstring);
     close(IN);
-    if ($versionstring =~ /^SUSE LINUX Enterprise Server ([\d\.]+) /) {
+    if ($versionstring =~ /^SUSE LINUX Enterprise Server ([\d\.]+) /i) {
         $dist='sles'.$1;
-    } elsif ($versionstring =~ /^SuSE Linux ([\d\.]+) /) {
+    } elsif ($versionstring =~ /^SuSE Linux ([\d\.]+) /i) {
+        $dist = 'suse'.$1;
+    } elsif ($versionstring =~ /^openSUSE ([\d\.]+) /i) {
         $dist = 'suse'.$1;
     } else {
         warn('Unable to interpret /etc/SuSE-release '.
              'to determine system type');
+        $unknown = 1;
+    }
+} elsif (-e '/etc/issue') {
+    open(IN,'</etc/issue');
+    my $versionstring=<IN>;
+    chomp($versionstring);
+    close(IN);
+    if ($versionstring =~ /^Ubuntu (\d+)\.\d+/i) {
+        $dist = 'ubuntu'.$1;
+    } elsif ($versionstring =~ /^Debian\s+GNU\/Linux\s+(\d+)\.\d+/i) {
+        $dist = 'debian'.$1;
+    } elsif (-e '/etc/debian_version') {
+        open(IN,'</etc/debian_version');
+        my $version=<IN>;
+        chomp($version);
+        close(IN);
+        if ($version =~  /^(\d+)\.\d+\.?\d*/) {
+            $dist='debian'.$1;
+        } else {
+            warn('Unable to interpret /etc/debian_version '.
+                 'to determine system type');
+            $unknown = 1;
+        }
+    }
+} elsif (-e '/etc/debian_version') {
+    open(IN,'</etc/debian_version');
+    my $version=<IN>;
+    chomp($version);
+    close(IN);
+    if ($version =~  /^(\d+)\.\d+\.?\d*/) {
+        $dist='debian'.$1;
+    } else {
+        warn('Unable to interpret /etc/debian_version '.
+             'to determine system type');
+        $unknown = 1;
+    }
+}
+if (($dist eq 'default') && (!$unknown)) {
+    if (-e '/etc/os-release') {
+        if (open(IN,'<','/etc/os-release')) {
+            my ($id,$version);
+            while(<IN>) {
+                chomp();
+                if (/^ID="(\w+)"/) {
+                    $id=$1;
+                } elsif (/^VERSION_ID="([\d\.]+)"/) {
+                    $version=$1;
+                }
+            }
+            close(IN);
+            if ($id eq 'sles') {
+                my ($major,$minor) = split(/\./,$version);
+                if ($major =~ /^\d+$/) {
+                    $dist = $id.$major;
+                }
+            }
+        }
+        if ($dist eq 'default') {
+            warn('Unable to interpret /etc/os-release '.
+                 'to determine system type.');
+            $unknown = 1;
+        }
+    } else {
+        warn('Unknown installation: expecting a debian, ubuntu, suse, sles, redhat, fedora or scientific linux system.')."\n";
     }
-} else {
-    warn('Unknown installation: expecting a debian, suse, or redhat system');
 }
 print $dist;