anchor.diff:  
         extraGroups = mkOption {
           default = [];
  -	example = [ "users" ];
  -	description = "Defines extra groups to which the tomcat user belongs.";
  +        example = [ "users" ];
  +        description = "Defines extra groups to which the tomcat user belongs.";
         };
   
         user = mkOption {
  
positive.code: 
          preStart =
            ''
  	    # Create the base directory
  	    mkdir -p ${cfg.baseDir}
  
  	    # Create a symlink to the bin directory of the tomcat component
  	    ln -sfn ${tomcat}/bin ${cfg.baseDir}/bin
  
  	    # Create a conf/ directory
  	    mkdir -p ${cfg.baseDir}/conf
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/conf
  
  	    # Symlink the config files in the conf/ directory (except for catalina.properties and server.xml)
  	    for i in $(ls ${tomcat}/conf | grep -v catalina.properties | grep -v server.xml)
  	    do
  	        ln -sfn ${tomcat}/conf/$i ${cfg.baseDir}/conf/`basename $i`
  	    done
  
              # Create subdirectory for virtual hosts
              mkdir -p ${cfg.baseDir}/virtualhosts
  
  	    # Create a modified catalina.properties file
  	    # Change all references from CATALINA_HOME to CATALINA_BASE and add support for shared libraries
  	    sed -e 's|''${catalina.home}|''${catalina.base}|g' \
                  -e 's|shared.loader=|shared.loader=''${catalina.base}/shared/lib/*.jar|' \
  		${tomcat}/conf/catalina.properties > ${cfg.baseDir}/conf/catalina.properties
  
  	    # Create a modified server.xml which also includes all virtual hosts
  	    sed -e "/<Engine name=\"Catalina\" defaultHost=\"localhost\">/a\  ${
                           toString (map (virtualHost: ''<Host name=\"${virtualHost.name}\" appBase=\"virtualhosts/${virtualHost.name}/webapps\" unpackWARs=\"true\" autoDeploy=\"true\" xmlValidation=\"false\" xmlNamespaceAware=\"false\" >${if cfg.logPerVirtualHost then ''<Valve className=\"org.apache.catalina.valves.AccessLogValve\" directory=\"logs/${virtualHost.name}\"  prefix=\"${virtualHost.name}_access_log.\" pattern=\"combined\" resolveHosts=\"false\"/>'' else ""}</Host>'') cfg.virtualHosts)}" \
  	        ${tomcat}/conf/server.xml > ${cfg.baseDir}/conf/server.xml
  
  	    # Create a logs/ directory
  	    mkdir -p ${cfg.baseDir}/logs
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/logs
              ${if cfg.logPerVirtualHost then
                 toString (map (h: ''
                                      mkdir -p ${cfg.baseDir}/logs/${h.name}
                                      chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/logs/${h.name}
                                   '') cfg.virtualHosts) else ''''}
  
  	    # Create a temp/ directory
  	    mkdir -p ${cfg.baseDir}/temp
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/temp
  
  	    # Create a lib/ directory
  	    mkdir -p ${cfg.baseDir}/lib
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/lib
  
  	    # Create a shared/lib directory
  	    mkdir -p ${cfg.baseDir}/shared/lib
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/shared/lib
  
  	    # Create a webapps/ directory
  	    mkdir -p ${cfg.baseDir}/webapps
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/webapps
  
  	    # Symlink all the given common libs files or paths into the lib/ directory
  	    for i in ${tomcat} ${toString cfg.commonLibs}
  	    do
  		if [ -f $i ]
  		then
  		    # If the given web application is a file, symlink it into the common/lib/ directory
  		    ln -sfn $i ${cfg.baseDir}/lib/`basename $i`
  		elif [ -d $i ]
  		then
  		    # If the given web application is a directory, then iterate over the files
  		    # in the special purpose directories and symlink them into the tomcat tree
  
  		    for j in $i/lib/*
  		    do
  			ln -sfn $j ${cfg.baseDir}/lib/`basename $j`
  		    done
  		fi
  	    done
  
  	    # Symlink all the given shared libs files or paths into the shared/lib/ directory
  	    for i in ${toString cfg.sharedLibs}
  	    do
  		if [ -f $i ]
  		then
  		    # If the given web application is a file, symlink it into the common/lib/ directory
  		    ln -sfn $i ${cfg.baseDir}/shared/lib/`basename $i`
  		elif [ -d $i ]
  		then
  		    # If the given web application is a directory, then iterate over the files
  		    # in the special purpose directories and symlink them into the tomcat tree
  
  		    for j in $i/shared/lib/*
  		    do
  			ln -sfn $j ${cfg.baseDir}/shared/lib/`basename $j`
  		    done
  		fi
  	    done
  
  	    # Symlink all the given web applications files or paths into the webapps/ directory
  	    for i in ${toString cfg.webapps}
  	    do
  		if [ -f $i ]
  		then
  		    # If the given web application is a file, symlink it into the webapps/ directory
  		    ln -sfn $i ${cfg.baseDir}/webapps/`basename $i`
  		elif [ -d $i ]
  		then
  		    # If the given web application is a directory, then iterate over the files
  		    # in the special purpose directories and symlink them into the tomcat tree
  
  		    for j in $i/webapps/*
  		    do
  		        ln -sfn $j ${cfg.baseDir}/webapps/`basename $j`
  		    done
  
  		    # Also symlink the configuration files if they are included
  		    if [ -d $i/conf/Catalina ]
  		    then
  			for j in $i/conf/Catalina/*
  			do
  			    mkdir -p ${cfg.baseDir}/conf/Catalina/localhost
  			    ln -sfn $j ${cfg.baseDir}/conf/Catalina/localhost/`basename $j`
  			done
  		    fi
  		fi
  	    done
  
  	    ${toString (map (virtualHost: ''
  	      # Create webapps directory for the virtual host
  	      mkdir -p ${cfg.baseDir}/virtualhosts/${virtualHost.name}/webapps
  
  	      # Modify ownership
  	      chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/virtualhosts/${virtualHost.name}/webapps
  
  	      # Symlink all the given web applications files or paths into the webapps/ directory
  	      # of this virtual host
  	      for i in "${if virtualHost ? webapps then toString virtualHost.webapps else ""}"
  	      do
  		  if [ -f $i ]
  		  then
  		      # If the given web application is a file, symlink it into the webapps/ directory
  		      ln -sfn $i ${cfg.baseDir}/virtualhosts/${virtualHost.name}/webapps/`basename $i`
  		  elif [ -d $i ]
  		  then
  		      # If the given web application is a directory, then iterate over the files
  		      # in the special purpose directories and symlink them into the tomcat tree
  
  		      for j in $i/webapps/*
  		      do
  		          ln -sfn $j ${cfg.baseDir}/virtualhosts/${virtualHost.name}/webapps/`basename $j`
  		      done
  
  		      # Also symlink the configuration files if they are included
  		      if [ -d $i/conf/Catalina ]
  		      then
  			  for j in $i/conf/Catalina/*
  			  do
  			      mkdir -p ${cfg.baseDir}/conf/Catalina/${virtualHost.name}
  			      ln -sfn $j ${cfg.baseDir}/conf/Catalina/${virtualHost.name}/`basename $j`
  			  done
  		      fi
                    fi
  	      done
  
  	      ''
  	    ) cfg.virtualHosts) }
  
  	    # Create a work/ directory
  	    mkdir -p ${cfg.baseDir}/work
  	    chown ${cfg.user}:${cfg.group} ${cfg.baseDir}/work
  
  	    ${if cfg.axis2.enable then
  		''
  		# Copy the Axis2 web application
  		cp -av ${pkgs.axis2}/webapps/axis2 ${cfg.baseDir}/webapps
  
  		# Turn off addressing, which causes many errors
  		sed -i -e 's%<module ref="addressing"/>%<!-- <module ref="addressing"/> -->%' ${cfg.baseDir}/webapps/axis2/WEB-INF/conf/axis2.xml
  
  		# Modify permissions on the Axis2 application
  		chown -R ${cfg.user}:${cfg.group} ${cfg.baseDir}/webapps/axis2
  
  		# Symlink all the given web service files or paths into the webapps/axis2/WEB-INF/services directory
  		for i in ${toString cfg.axis2.services}
  		do
  		    if [ -f $i ]
  		    then
  			# If the given web service is a file, symlink it into the webapps/axis2/WEB-INF/services
  			ln -sfn $i ${cfg.baseDir}/webapps/axis2/WEB-INF/services/`basename $i`
  		    elif [ -d $i ]
  		    then
  			# If the given web application is a directory, then iterate over the files
  		        # in the special purpose directories and symlink them into the tomcat tree
  
  			for j in $i/webapps/axis2/WEB-INF/services/*
  			do
  			    ln -sfn $j ${cfg.baseDir}/webapps/axis2/WEB-INF/services/`basename $j`
  			done
  
  			# Also symlink the configuration files if they are included
  		        if [ -d $i/conf/Catalina ]
  		        then
  			    for j in $i/conf/Catalina/*
  			    do
  			        ln -sfn $j ${cfg.baseDir}/conf/Catalina/localhost/`basename $j`
  			    done
  		        fi
  		    fi
  		done
  		''
  	    else ""}
  
              ${pkgs.su}/bin/su -s ${pkgs.bash}/bin/sh ${cfg.user} -c 'CATALINA_BASE=${cfg.baseDir} JAVA_HOME=${pkgs.jdk} JAVA_OPTS="${cfg.javaOpts}" CATALINA_OPTS="${cfg.catalinaOpts}" ${tomcat}/bin/startup.sh'
            '';
  
negative.code:         uid = config.ids.uids.tomcat;
          description = "Tomcat user";
          home = "/homeless-shelter";
          extraGroups = cfg.extraGroups;
        };
  
      jobs.tomcat =
  