--- loncom/lond 2014/06/09 16:58:22 1.467.2.8
+++ loncom/lond 2012/04/11 06:22:04 1.489
@@ -2,7 +2,7 @@
# The LearningOnline Network
# lond "LON Daemon" Server (port "LOND" 5663)
#
-# $Id: lond,v 1.467.2.8 2014/06/09 16:58:22 raeburn Exp $
+# $Id: lond,v 1.489 2012/04/11 06:22:04 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
@@ -15,6 +15,7 @@
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
+
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
@@ -59,7 +60,7 @@ my $DEBUG = 0; # Non zero to ena
my $status='';
my $lastlog='';
-my $VERSION='$Revision: 1.467.2.8 $'; #' stupid emacs
+my $VERSION='$Revision: 1.489 $'; #' stupid emacs
my $remoteVERSION;
my $currenthostid="default";
my $currentdomainid;
@@ -91,6 +92,8 @@ my %managers; # Ip -> manager names
my %perlvar; # Will have the apache conf defined perl vars.
+my $dist;
+
#
# The hash below is used for command dispatching, and is therefore keyed on the request keyword.
# Each element of the hash contains a reference to an array that contains:
@@ -600,8 +603,8 @@ sub InstallFile {
#
# ConfigFileFromSelector: converts a configuration file selector
# into a configuration file pathname.
-# Supports the following file selectors:
-# hosts, domain, dns_hosts, dns_domain
+# Supports the following file selectors:
+# hosts, domain, dns_hosts, dns_domain
#
#
# Parameters:
@@ -614,12 +617,11 @@ sub ConfigFileFromSelector {
my $tablefile;
my $tabledir = $perlvar{'lonTabDir'}.'/';
- if (($selector eq "hosts") || ($selector eq "domain") ||
+ if (($selector eq "hosts") || ($selector eq "domain") ||
($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
- $tablefile = $tabledir.$selector.'.tab';
+ $tablefile = $tabledir.$selector.'.tab';
}
return $tablefile;
-
}
#
# PushFile: Called to do an administrative push of a file.
@@ -637,7 +639,7 @@ sub ConfigFileFromSelector {
# String to send to client ("ok" or "refused" if bad file).
#
sub PushFile {
- my $request = shift;
+ my $request = shift;
my ($command, $filename, $contents) = split(":", $request, 3);
&Debug("PushFile");
@@ -646,7 +648,7 @@ sub PushFile {
# hosts.tab ($filename eq host).
# domain.tab ($filename eq domain).
# dns_hosts.tab ($filename eq dns_host).
- # dns_domain.tab ($filename eq dns_domain).
+ # dns_domain.tab ($filename eq dns_domain).
# Construct the destination filename or reject the request.
#
# lonManage is supposed to ensure this, however this session could be
@@ -667,44 +669,6 @@ sub PushFile {
if($filename eq "host") {
$contents = AdjustHostContents($contents);
- } elsif ($filename eq 'dns_host' || $filename eq 'dns_domain') {
- if ($contents eq '') {
- &logthis('<font color="red"> Pushfile: unable to install '
- .$tablefile." - no data received from push. </font>");
- return 'error: push had no data';
- }
- if (&Apache::lonnet::get_host_ip($clientname)) {
- my $clienthost = &Apache::lonnet::hostname($clientname);
- if ($managers{$clientip} eq $clientname) {
- my $clientprotocol = $Apache::lonnet::protocol{$clientname};
- $clientprotocol = 'http' if ($clientprotocol ne 'https');
- my $url = '/adm/'.$filename;
- $url =~ s{_}{/};
- my $ua=new LWP::UserAgent;
- $ua->timeout(60);
- my $request=new HTTP::Request('GET',"$clientprotocol://$clienthost$url");
- my $response=$ua->request($request);
- if ($response->is_error()) {
- &logthis('<font color="red"> Pushfile: unable to install '
- .$tablefile." - error attempting to pull data. </font>");
- return 'error: pull failed';
- } else {
- my $result = $response->content;
- chomp($result);
- unless ($result eq $contents) {
- &logthis('<font color="red"> Pushfile: unable to install '
- .$tablefile." - pushed data and pulled data differ. </font>");
- my $pushleng = length($contents);
- my $pullleng = length($result);
- if ($pushleng != $pullleng) {
- return "error: $pushleng vs $pullleng bytes";
- } else {
- return "error: mismatch push and pull";
- }
- }
- }
- }
- }
}
# Install the new file:
@@ -715,8 +679,8 @@ sub PushFile {
.$tablefile." $! </font>");
return "error:$!";
} else {
- &logthis('<font color="green"> Installed new '.$tablefile
- ." - transaction by: $clientname ($clientip)</font>");
+ &logthis('<font color="green"> Installed new '.$tablefile
+ ." - transaction by: $clientname ($clientip)</font>");
my $adminmail = $perlvar{'lonAdmEMail'};
my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
if ($admindom ne '') {
@@ -1679,6 +1643,74 @@ sub ls3_handler {
}
®ister_handler("ls3", \&ls3_handler, 0, 1, 0);
+sub read_lonnet_global {
+ my ($cmd,$tail,$client) = @_;
+ my $userinput = "$cmd:$tail";
+ my $requested = &Apache::lonnet::thaw_unescape($tail);
+ my $result;
+ my %packagevars = (
+ spareid => \%Apache::lonnet::spareid,
+ perlvar => \%Apache::lonnet::perlvar,
+ );
+ my %limit_to = (
+ perlvar => {
+ lonOtherAuthen => 1,
+ lonBalancer => 1,
+ lonVersion => 1,
+ lonSysEMail => 1,
+ lonHostID => 1,
+ lonRole => 1,
+ lonDefDomain => 1,
+ lonLoadLim => 1,
+ lonUserLoadLim => 1,
+ }
+ );
+ if (ref($requested) eq 'HASH') {
+ foreach my $what (keys(%{$requested})) {
+ my $response;
+ my $items = {};
+ if (exists($packagevars{$what})) {
+ if (ref($limit_to{$what}) eq 'HASH') {
+ foreach my $varname (keys(%{$packagevars{$what}})) {
+ if ($limit_to{$what}{$varname}) {
+ $items->{$varname} = $packagevars{$what}{$varname};
+ }
+ }
+ } else {
+ $items = $packagevars{$what};
+ }
+ if ($what eq 'perlvar') {
+ if (!exists($packagevars{$what}{'lonBalancer'})) {
+ if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+ my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
+ if (ref($othervarref) eq 'HASH') {
+ $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
+ }
+ }
+ }
+ }
+ $response = &Apache::lonnet::freeze_escape($items);
+ }
+ $result .= &escape($what).'='.$response.'&';
+ }
+ }
+ $result =~ s/\&$//;
+ &Reply($client,\$result,$userinput);
+ return 1;
+}
+®ister_handler("readlonnetglobal", \&read_lonnet_global, 0, 1, 0);
+
+sub server_devalidatecache_handler {
+ my ($cmd,$tail,$client) = @_;
+ my $userinput = "$cmd:$tail";
+ my ($name,$id) = map { &unescape($_); } split(/:/,$tail);
+ &Apache::lonnet::devalidate_cache_new($name,$id);
+ my $result = 'ok';
+ &Reply($client,\$result,$userinput);
+ return 1;
+}
+®ister_handler("devalidatecache", \&server_devalidatecache_handler, 0, 1, 0);
+
sub server_timezone_handler {
my ($cmd,$tail,$client) = @_;
my $userinput = "$cmd:$tail";
@@ -2041,7 +2073,7 @@ sub add_user_handler {
."makeuser";
}
unless ($fperror) {
- my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+ my $result=&make_passwd_file($uname,$udom,$umode,$npass, $passfilename);
&Reply($client,\$result, $userinput); #BUGBUG - could be fail
} else {
&Failure($client, \$fperror, $userinput);
@@ -2116,7 +2148,7 @@ sub change_authentication_handler {
&Failure($client, \$result);
}
} else {
- my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+ my $result=&make_passwd_file($uname,$udom,$umode,$npass,$passfilename);
#
# If the current auth mode is internal, and the old auth mode was
# unix, or krb*, and the user is an author for this domain,
@@ -3213,6 +3245,12 @@ sub dump_profile_database {
# that is matched against
# database keywords to do
# selective dumps.
+# range - optional range of entries
+# e.g., 10-20 would return the
+# 10th to 19th items, etc.
+# extra - optional ref to hash of
+# additional args. currently
+# skipcheck is only key used.
# $client - Channel open on the client.
# Returns:
# 1 - Continue processing.
@@ -3247,12 +3285,26 @@ sub dump_with_regexp {
if ($hashref) {
my $qresult='';
my $count=0;
+#
+# When dump is for roles.db, determine if LON-CAPA version checking is needed.
+# Sessions on 2.10 and later will include skipcheck => 1 in extra args ref,
+# to indicate no version checking is needed (in this case, checking occurs
+# on the server hosting the user session, when constructing the roles/courses
+# screen).
+#
if ($extra ne '') {
$extra = &Apache::lonnet::thaw_unescape($extra);
$skipcheck = $extra->{'skipcheck'};
}
my @ids = &Apache::lonnet::current_machine_ids();
my (%homecourses,$major,$minor,$now);
+#
+# If dump is for roles.db from a pre-2.10 server, determine the LON-CAPA
+# version on the server which requested the data. For LON-CAPA 2.9, the
+# client session will have sent its LON-CAPA version when initiating the
+# connection. For LON-CAPA 2.8 and older, the version is retrieved from
+# the global %loncaparevs in lonnet.pm.
+#
if (($namespace eq 'roles') && (!$skipcheck)) {
my $loncaparev = $clientversion;
if ($loncaparev eq '') {
@@ -3270,8 +3322,18 @@ sub dump_with_regexp {
my $cdom = $1;
my $cnum = $2;
unless ($skipcheck) {
- my ($role,$end,$start) = split(/\_/,$value);
- if (!$end || $end > $now) {
+ my ($role,$roleend,$rolestart) = split(/\_/,$value);
+ if (!$roleend || $roleend > $now) {
+#
+# For active course roles, check that requesting server is running a LON-CAPA
+# version which meets any version requirements for the course. Do not include
+# the role amongst the results returned if the requesting server's version is
+# too old.
+#
+# This determination is handled differently depending on whether the course's
+# homeserver is the current server, or whether it is a different server.
+# In both cases, the course's version requirement needs to be retrieved.
+#
next unless (&releasereqd_check($cnum,$cdom,$key,$value,$major,
$minor,\%homecourses,\@ids));
}
@@ -3294,9 +3356,16 @@ sub dump_with_regexp {
}
}
if (&untie_user_hash($hashref)) {
+#
+# If dump is for roles.db from a pre-2.10 server, check if the LON-CAPA
+# version requirements for courses for which the current server is the home
+# server permit course roles to be usable on the client server hosting the
+# user's session. If so, include those role results in the data returned to
+# the client server.
+#
if (($namespace eq 'roles') && (!$skipcheck)) {
if (keys(%homecourses) > 0) {
- $qresult .= &check_homecourses(\%homecourses,$udom,$regexp,$count,
+ $qresult .= &check_homecourses(\%homecourses,$regexp,$count,
$range,$start,$end,$major,$minor);
}
}
@@ -5079,7 +5148,7 @@ sub validate_course_owner_handler {
my ($cmd, $tail, $client) = @_;
my $userinput = "$cmd:$tail";
my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
-
+
$owner = &unescape($owner);
$coowners = &unescape($coowners);
my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
@@ -6070,7 +6139,7 @@ if (-e $pidfile) {
$server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
Type => SOCK_STREAM,
Proto => 'tcp',
- ReuseAddr => 1,
+ ReuseAddr => 1,
Listen => 10 )
or die "making socket: $@\n";
@@ -6133,6 +6202,7 @@ sub HUPSMAN { # sig
# a setuid perl script that can be root for us to do this job.
#
sub ReloadApache {
+# --------------------------- Handle case of another apachereload process (locking)
if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
my $execdir = $perlvar{'lonDaemons'};
my $script = $execdir."/apachereload";
@@ -6402,7 +6472,7 @@ $SIG{USR2} = \&UpdateHosts;
&Apache::lonnet::load_hosts_tab();
my %iphost = &Apache::lonnet::get_iphost(1);
-my $dist=`$perlvar{'lonDaemons'}/distprobe`;
+$dist=`$perlvar{'lonDaemons'}/distprobe`;
my $arch = `uname -i`;
chomp($arch);
@@ -6477,13 +6547,12 @@ sub make_new_child {
#don't get intercepted
$SIG{USR1}= \&logstatus;
$SIG{ALRM}= \&timeout;
-
- #
- # Block sigpipe as it gets thrownon socket disconnect and we want to
- # deal with that as a read faiure instead.
- #
- my $blockset = POSIX::SigSet->new(SIGPIPE);
- sigprocmask(SIG_BLOCK, $blockset);
+ #
+ # Block sigpipe as it gets thrownon socket disconnect and we want to
+ # deal with that as a read faiure instead.
+ #
+ my $blockset = POSIX::SigSet->new(SIGPIPE);
+ sigprocmask(SIG_BLOCK, $blockset);
$lastlog='Forked ';
$status='Forked';
@@ -6685,22 +6754,29 @@ sub is_author {
# Author role should show up as a key /domain/_au
- my $key = "/$domain/_au";
my $value;
- if (defined($hashref)) {
- $value = $hashref->{$key};
- }
+ if ($hashref) {
- if(defined($value)) {
- &Debug("$user @ $domain is an author");
+ my $key = "/$domain/_au";
+ if (defined($hashref)) {
+ $value = $hashref->{$key};
+ if(!untie_user_hash($hashref)) {
+ return 'error: ' . ($!+0)." untie (GDBM) Failed";
+ }
+ }
+
+ if(defined($value)) {
+ &Debug("$user @ $domain is an author");
+ }
+ } else {
+ return 'error: '.($!+0)." tie (GDBM) Failed";
}
return defined($value);
}
#
# Checks to see if the input roleput request was to set
-# an author role. If so, invokes the lchtmldir script to set
-# up a correct public_html
+# an author role. If so, creates construction space
# Parameters:
# request - The request sent to the rolesput subchunk.
# We're looking for /domain/_au
@@ -6710,16 +6786,15 @@ sub is_author {
#
sub manage_permissions {
my ($request, $domain, $user, $authtype) = @_;
-
- &Debug("manage_permissions: $request $domain $user $authtype");
-
# See if the request is of the form /$domain/_au
if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
- my $execdir = $perlvar{'lonDaemons'};
- my $userhome= "/home/$user" ;
- &logthis("system $execdir/lchtmldir $userhome $user $authtype");
- &Debug("Setting homedir permissions for $userhome");
- system("$execdir/lchtmldir $userhome $user $authtype");
+ my $path=$perlvar{'lonDocRoot'}."/priv/$domain";
+ unless (-e $path) {
+ mkdir($path);
+ }
+ unless (-e $path.'/'.$user) {
+ mkdir($path.'/'.$user);
+ }
}
}
@@ -7252,7 +7327,7 @@ sub change_unix_password {
sub make_passwd_file {
- my ($uname, $umode,$npass,$passfilename)=@_;
+ my ($uname,$udom,$umode,$npass,$passfilename)=@_;
my $result="ok";
if ($umode eq 'krb4' or $umode eq 'krb5') {
{
@@ -7293,7 +7368,7 @@ sub make_passwd_file {
#
my $uid = getpwnam($uname);
if((defined $uid) && ($uid == 0)) {
- &logthis(">>>Attempted to create privilged account blocked");
+ &logthis(">>>Attempt to create privileged account blocked");
return "no_priv_account_error\n";
}
@@ -7305,6 +7380,7 @@ sub make_passwd_file {
&Debug("user = ".$uname.", Password =". $npass);
my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
print $se "$uname\n";
+ print $se "$udom\n";
print $se "$npass\n";
print $se "$npass\n";
print $se "$lc_error_file\n"; # Status -> unique file.
@@ -7398,6 +7474,20 @@ sub get_usersession_config {
return;
}
+#
+# releasereqd_check() will determine if a LON-CAPA version (defined in the
+# $major,$minor args passed) is not too old to allow use of a role in a
+# course ($cnum,$cdom args passed), if at least one of the following applies:
+# (a) the course is a Community, (b) the course's home server is *not* the
+# current server, or (c) cached course information is not stale.
+#
+# For the case where none of these apply, the course is added to the
+# $homecourse hash ref (keys = courseIDs, values = array of a hash of roles).
+# The $homecourse hash ref is for courses for which the current server is the
+# home server. LON-CAPA version requirements are checked elsewhere for the
+# items in $homecourse.
+#
+
sub releasereqd_check {
my ($cnum,$cdom,$key,$value,$major,$minor,$homecourses,$ids) = @_;
my $home = &Apache::lonnet::homeserver($cnum,$cdom);
@@ -7427,10 +7517,18 @@ sub releasereqd_check {
if (ref($ids) eq 'ARRAY') {
if (grep(/^\Q$home\E$/,@{$ids})) {
if (ref($homecourses) eq 'HASH') {
- if (ref($homecourses->{$hashid}) eq 'ARRAY') {
- push(@{$homecourses->{$hashid}},{$key=>$value});
+ if (ref($homecourses->{$cdom}) eq 'HASH') {
+ if (ref($homecourses->{$cdom}{$cnum}) eq 'HASH') {
+ if (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY') {
+ push(@{$homecourses->{$cdom}{$cnum}},{$key=>$value});
+ } else {
+ $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
+ }
+ } else {
+ $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
+ }
} else {
- $homecourses->{$hashid} = [{$key=>$value}];
+ $homecourses->{$cdom}{$cnum} = [{$key=>$value}];
}
}
return;
@@ -7449,6 +7547,17 @@ sub releasereqd_check {
return 1;
}
+#
+# get_courseinfo_hash() is used to retrieve course information from the db
+# file: nohist_courseids.db for a course for which the current server is *not*
+# the home server.
+#
+# A hash of a hash will be retrieved. The outer hash contains a single key --
+# courseID -- for the course for which the data are being requested.
+# The contents of the inner hash, for that single item in the outer hash
+# are returned (and cached in memcache for 10 minutes).
+#
+
sub get_courseinfo_hash {
my ($cnum,$cdom,$home) = @_;
my %info;
@@ -7474,43 +7583,64 @@ sub get_courseinfo_hash {
return;
}
+#
+# check_homecourses() will retrieve course information for those courses which
+# are keys of the $homecourses hash ref (first arg). The nohist_courseids.db
+# GDBM file is tied and course information for each course retrieved. Last
+# visit (lasttime key) is also retrieved for each, and cached values updated
+# for any courses last visited less than 24 hours ago. Cached values are also
+# updated for any courses included in the $homecourses hash ref.
+#
+# The reason for the 24 hours constraint is that the cron entry in
+# /etc/cron.d/loncapa for /home/httpd/perl/refresh_courseids_db.pl causes
+# cached course information to be updated nightly for courses with activity
+# within the past 24 hours.
+#
+# Role information for the user (included in a ref to an array of hashes as the
+# value for each key in $homecourses) is appended to the result returned by the
+# routine, which will in turn be appended to the string returned to the client
+# hosting the user's session.
+#
+
sub check_homecourses {
- my ($homecourses,$udom,$regexp,$count,$range,$start,$end,$major,$minor) = @_;
+ my ($homecourses,$regexp,$count,$range,$start,$end,$major,$minor) = @_;
my ($result,%addtocache);
my $yesterday = time - 24*3600;
if (ref($homecourses) eq 'HASH') {
my (%okcourses,%courseinfo,%recent);
- my $hashref = &tie_domain_hash($udom, "nohist_courseids", &GDBM_WRCREAT());
- if ($hashref) {
- while (my ($key,$value) = each(%$hashref)) {
- my $unesc_key = &unescape($key);
- if ($unesc_key =~ /^lasttime:(\w+)$/) {
- my $cid = $1;
- $cid =~ s/_/:/;
- if ($value > $yesterday ) {
- $recent{$cid} = 1;
+ foreach my $domain (keys(%{$homecourses})) {
+ my $hashref =
+ &tie_domain_hash($domain, "nohist_courseids", &GDBM_WRCREAT());
+ if (ref($hashref) eq 'HASH') {
+ while (my ($key,$value) = each(%$hashref)) {
+ my $unesc_key = &unescape($key);
+ if ($unesc_key =~ /^lasttime:(\w+)$/) {
+ my $cid = $1;
+ $cid =~ s/_/:/;
+ if ($value > $yesterday ) {
+ $recent{$cid} = 1;
+ }
+ next;
}
- next;
- }
- my $items = &Apache::lonnet::thaw_unescape($value);
- if (ref($items) eq 'HASH') {
- my $hashid = $unesc_key;
- $hashid =~ s/_/:/;
- $courseinfo{$hashid} = $items;
- if (ref($homecourses->{$hashid}) eq 'ARRAY') {
- my ($reqdmajor,$reqdminor) = split(/\./,$items->{'releaserequired'});
- if (&useable_role($reqdmajor,$reqdminor,$major,$minor)) {
- $okcourses{$hashid} = 1;
+ my $items = &Apache::lonnet::thaw_unescape($value);
+ if (ref($items) eq 'HASH') {
+ my ($cdom,$cnum) = split(/_/,$unesc_key);
+ my $hashid = $cdom.':'.$cnum;
+ $courseinfo{$hashid} = $items;
+ if (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY') {
+ my ($reqdmajor,$reqdminor) = split(/\./,$items->{'releaserequired'});
+ if (&useable_role($reqdmajor,$reqdminor,$major,$minor)) {
+ $okcourses{$hashid} = 1;
+ }
}
}
}
+ unless (&untie_domain_hash($hashref)) {
+ &logthis("Failed to untie tied hash for nohist_courseids.db for $domain");
+ }
+ } else {
+ &logthis("Failed to tie hash for nohist_courseids.db for $domain");
}
- unless (&untie_domain_hash($hashref)) {
- &logthis('Failed to untie tied hash for nohist_courseids.db');
- }
- } else {
- &logthis('Failed to tie hash for nohist_courseids.db');
- return;
}
foreach my $hashid (keys(%recent)) {
my ($result,$cached)=&Apache::lonnet::is_cached_new('courseinfo',$hashid);
@@ -7518,13 +7648,20 @@ sub check_homecourses {
&Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
}
}
- foreach my $hashid (keys(%{$homecourses})) {
- next if ($recent{$hashid});
- &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
+ foreach my $cdom (keys(%{$homecourses})) {
+ if (ref($homecourses->{$cdom}) eq 'HASH') {
+ foreach my $cnum (keys(%{$homecourses->{$cdom}})) {
+ my $hashid = $cdom.':'.$cnum;
+ next if ($recent{$hashid});
+ &Apache::lonnet::do_cache_new('courseinfo',$hashid,$courseinfo{$hashid},600);
+ }
+ }
}
foreach my $hashid (keys(%okcourses)) {
- if (ref($homecourses->{$hashid}) eq 'ARRAY') {
- foreach my $role (@{$homecourses->{$hashid}}) {
+ my ($cdom,$cnum) = split(/:/,$hashid);
+ if ((ref($homecourses->{$cdom}) eq 'HASH') &&
+ (ref($homecourses->{$cdom}{$cnum}) eq 'ARRAY')) {
+ foreach my $role (@{$homecourses->{$cdom}{$cnum}}) {
if (ref($role) eq 'HASH') {
while (my ($key,$value) = each(%{$role})) {
if ($regexp eq '.') {
@@ -7550,6 +7687,12 @@ sub check_homecourses {
return $result;
}
+#
+# useable_role() will compare the LON-CAPA version required by a course with
+# the version available on the client server. If the client server's version
+# is compatible, 1 will be returned.
+#
+
sub useable_role {
my ($reqdmajor,$reqdminor,$major,$minor) = @_;
if ($reqdmajor ne '' && $reqdminor ne '') {