session management: use YAML::Syck for serialization

When using mysql and a sufficiently recent version
of DBD::mysql that actually respects the mysql_enable_utf8
option, setting the current branch to a name that
includes a diacritic causes the session to fail
and forces the user to the login screen upon
clicking another link.

This turned out to be due to the default (Data::Dumper)
serialization used by CGI::Session, which truncated the
session object at the diacritic.  By enabling
that module's YAML serialization option, the problem
was resolved.

This patch introduces a dependency on the YAML::Syck
module.

Signed-off-by: Chris Cormack <crc@liblime.com>
Signed-off-by: Joshua Ferraro <jmf@liblime.com>

C4/Auth.pm

@@ -1083,14 +1083,14 @@ sub get_session {
     my $dbh = C4::Context->dbh;
     my $session;
     if ($storage_method eq 'mysql'){
-        $session = new CGI::Session("driver:MySQL", $sessionID, {Handle=>$dbh});
+        $session = new CGI::Session("driver:MySQL;serializer:yaml", $sessionID, {Handle=>$dbh});
     }
     elsif ($storage_method eq 'Pg') {
-        $session = new CGI::Session("driver:PostgreSQL", $sessionID, {Handle=>$dbh});
+        $session = new CGI::Session("driver:PostgreSQL;serializer:yaml", $sessionID, {Handle=>$dbh});
     }
     else {
         # catch all defaults to tmp should work on all systems
-        $session = new CGI::Session("driver:File", $sessionID, {Directory=>'/tmp'});
+        $session = new CGI::Session("driver:File;serializer:yaml", $sessionID, {Directory=>'/tmp'});
     }
     return $session;
 }

Makefile.PL

@@ -520,6 +520,7 @@ WriteMakefile(
 'XML::SAX::ParserFactory' => 1.01,
 'XML::Simple' => 2.14,
 'XML::RSS' => 1.31,
+'YAML::Syck' => 1.00,
         },
 
 	# File tree mapping

about.pl

@@ -112,6 +112,7 @@ XML::LibXSLT
 XML::SAX::ParserFactory
 XML::Simple
 XML::RSS
+YAML::Syck
       /;
 
 my @components = ();

install_misc/debian.packages

@@ -59,6 +59,7 @@ libxml2-dev	install
 libxml2-utils	install
 libxslt1-dev	install
 libxslt1.1	install
+libyaml-syck-perl install
 libyaz	install
 libyaz-dev	install
 yaz	install

installer/install.pl

@@ -66,6 +66,9 @@ if ( $step && $step == 1 ) {
     unless ( eval { require ZOOM } ) {
         push @missing, { name => "ZOOM" };
     }
+    unless ( eval { require YAML::Syck } ) {
+        push @missing, { name => "YAML::Syck" };
+    }
     unless ( eval { require LWP::Simple } ) {
         push @missing, { name => "LWP::Simple" };
     }