SERVER-16547 --filePermissions should show default in octal

Author: kangas

src/mongo/db/server_options_helpers.cpp

@@ -36,6 +36,7 @@
 #define SYSLOG_NAMES
 #include <syslog.h>
 #endif
+#include <ios>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/operations.hpp>
 
@@ -111,13 +112,13 @@ namespace {
     Status addGeneralServerOptions(moe::OptionSection* options) {
         StringBuilder portInfoBuilder;
         StringBuilder maxConnInfoBuilder;
-        StringBuilder unixSockPermsBuilder;
+        std::stringstream unixSockPermsBuilder;
 
         portInfoBuilder << "specify port number - " << ServerGlobalParams::DefaultDBPort << " by default";
         maxConnInfoBuilder << "max number of simultaneous connections - "
                            << DEFAULT_MAX_CONN << " by default";
         unixSockPermsBuilder << "permissions to set on UNIX domain socket file - " 
-                             << DEFAULT_UNIX_PERMS << " by default";
+                             << "0" << std::oct << DEFAULT_UNIX_PERMS << " by default";
 
         options->addOptionChaining("help", "help,h", moe::Switch, "show this usage information")
                                   .setSources(moe::SourceAllLegacy);
@@ -275,7 +276,7 @@ namespace {
                 moe::String, "alternative directory for UNIX domain sockets (defaults to /tmp)");
 
         options->addOptionChaining("net.unixDomainSocket.filePermissions", "filePermissions", 
-                moe::Int, unixSockPermsBuilder.str().c_str() );
+                moe::Int, unixSockPermsBuilder.str() );
 
         options->addOptionChaining("processManagement.fork", "fork", moe::Switch,
                 "fork server process");