--- loncom/lonnet/perl/lonnet.pm	2000/12/29 19:28:19	1.83
+++ loncom/lonnet/perl/lonnet.pm	2001/01/05 20:45:09	1.87
@@ -82,6 +82,8 @@
 # 10/30,10/31,
 # 11/2,11/14,11/15,11/16,11/20,11/21,11/22,11/25,11/27,
 # 12/02,12/12,12/13,12/14,12/28,12/29 Gerd Kortemeyer
+# 05/01/01 Guy Albertelli
+# 05/01 Gerd Kortemeyer
 
 package Apache::lonnet;
 
@@ -258,9 +260,11 @@ sub appenv {
 	return 'error';
      }
      my $newname;
+     flock($fh,'LOCK_EX');
      foreach $newname (keys %newenv) {
 	 print $fh "$newname=$newenv{$newname}\n";
      }
+     $fh->close();
     }
     return 'ok';
 }
@@ -287,9 +291,11 @@ sub delenv {
      unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
 	return 'error';
      }
+     flock($fh,'LOCK_EX');
      map {
 	 unless ($_=~/^$delthis/) { print $fh $_; }
      } @oldenv;
+     $fh->close();
     }
     return 'ok';
 }
@@ -1300,6 +1306,64 @@ sub modifystudent {
     return &assignrole($udom,$uname,$uurl,'st',$end,$start);
 }
 
+# ------------------------------------------------- Write to course preferences
+
+sub writecoursepref {
+    my ($courseid,%prefs)=@_;
+    $courseid=~s/^\///;
+    $courseid=~s/\_/\//g;
+    my ($cdomain,$cnum)=split(/\//,$courseid);
+    my $chome=homeserver($cnum,$cdomain);
+    if (($chome eq '') || ($chome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    my $cstring='';
+    map {
+	$cstring.=escape($_).'='.escape($prefs{$_}).'&';
+    } keys %prefs;
+    $cstring=~s/\&$//;
+    return reply('put:'.$cdomain.':'.$cnum.':environment:'.$cstring,$chome);
+}
+
+# ---------------------------------------------------------- Make/modify course
+
+sub createcourse {
+    my ($udom,$description,$url)=@_;
+    $url=&declutter($url);
+    my $cid='';
+    unless (&allowed('ccc',$ENV{'user.domain'})) {
+        return 'refused';
+    }
+    unless ($udom eq $ENV{'user.domain'}) {
+        return 'refused';
+    }
+# ------------------------------------------------------------------- Create ID
+   my $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+       unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+# ----------------------------------------------- Make sure that does not exist
+   my $uhome=&homeserver($uname,$udom);
+   unless (($uhome eq '') || ($uhome eq 'no_host')) {
+       $uname=substr($$.time,0,5).unpack("H8",pack("I32",time)).
+        unpack("H2",pack("I32",int(rand(255)))).$perlvar{'lonHostID'};
+       $uhome=&homeserver($uname,$udom);       
+       unless (($uhome eq '') || ($uhome eq 'no_host')) {
+           return 'error: unable to generate unique course-ID';
+       } 
+   }
+# ------------------------------------------------------------- Make the course
+    my $reply=&reply('encrypt:makeuser:'.$udom.':'.$uname.':none::',
+                      $ENV{'user.home'});
+    unless ($reply eq 'ok') { return 'error: '.$reply; }
+    my $uhome=&homeserver($uname,$udom);
+    if (($uhome eq '') || ($uhome eq 'no_host')) { 
+	return 'error: no such course';
+    }
+    &writecoursepref($udom.'_'.$uname,
+                     ('description' => $description,
+                      'url'         => $url));
+    return '/'.$udom.'/'.$uname;
+}
+
 # ---------------------------------------------------------- Assign Custom Role
 
 sub assigncustomrole {