some more cleanups and fixes

server-tools/instance-manager/commands.cc:
  typo fixed
server-tools/instance-manager/instance.cc:
  moved options.complete_initialization to the instance::complete_initialization
server-tools/instance-manager/instance.h:
  moved options.complete_initialization to the Instance::complete_initialization
server-tools/instance-manager/instance_map.cc:
  moved options.complete_initialization to the Instance::complete_initialization, added code to create
  default instance if none is given iin config. file
server-tools/instance-manager/instance_map.h:
  complete_initialization now returns an error in case of a problem
server-tools/instance-manager/instance_options.cc:
  some error handling added
server-tools/instance-manager/instance_options.h:
  error handling added
server-tools/instance-manager/manager.cc:
  error handling added
server-tools/instance-manager/mysqlmanager.cc:
  stop mysqlmanager if options were not loaded correctly
server-tools/instance-manager/options.cc:
  return-value added
server-tools/instance-manager/options.h:
  return-value added to the OPtions::load()
server-tools/instance-manager/parse_output.cc:
  no need to examine mysqld --help -v termination status

server-tools/instance-manager/commands.cc

@@ -276,7 +276,7 @@ int Show_instance_options::do_command(struct st_net *net,
         goto err;
     }
 
-    if (instance->options.nonguarded == NULL)
+    if (instance->options.nonguarded != NULL)
     {
       position= 0;
       store_to_string(&send_buff, (char *) "nonguarded", &position);

server-tools/instance-manager/instance.cc

@@ -296,8 +296,9 @@ int Instance::init(const char *name_arg)
 }
 
 
-int Instance::complete_initialization(Instance_map *instance_map_arg)
+int Instance::complete_initialization(Instance_map *instance_map_arg,
+                                      const char *mysqld_path)
 {
   instance_map= instance_map_arg;
-  return 0;
+  return options.complete_initialization(mysqld_path);
 }

server-tools/instance-manager/instance.h

@@ -34,7 +34,8 @@ public:
 
   ~Instance();
   int init(const char *name);
-  int complete_initialization(Instance_map *instance_map_arg);
+  int complete_initialization(Instance_map *instance_map_arg,
+                              const char *mysqld_path);
 
   bool is_running();
   int start();

server-tools/instance-manager/instance_map.cc

@@ -74,7 +74,7 @@ static void delete_instance(void *u)
     1 - error occured
 */
 
-static int process_option(void * ctx, const char *group, const char *option)
+static int process_option(void *ctx, const char *group, const char *option)
 {
   Instance_map *map= NULL;
   Instance *instance= NULL;
@@ -178,18 +178,41 @@ Instance_map::find(const char *name, uint name_len)
 }
 
 
-void Instance_map::complete_initialization()
+int Instance_map::complete_initialization()
 {
   Instance *instance;
   uint i= 0;
 
+  if (hash.records == 0)                        /* no instances found */
+  {
+    if ((instance= new Instance) == 0)
+      goto err;
+
+    if (instance->init("mysqld") || add_instance(instance))
+      goto err_instance;
+
+    /*
+      After an instance have been added to the instance_map,
+      hash_free should handle it's deletion.
+    */
+    if (instance->complete_initialization(this, mysqld_path))
+      goto err;
+  }
+  else
     while (i < hash.records)
     {
       instance= (Instance *) hash_element(&hash, i);
-    instance->complete_initialization(this);
-    instance->options.complete_initialization(mysqld_path);
+      if (instance->complete_initialization(this, mysqld_path))
+        goto err;
       i++;
     }
+
+  return 0;
+err:
+  return 1;
+err_instance:
+  delete instance;
+  return 1;
 }
 
 
@@ -197,13 +220,11 @@ void Instance_map::complete_initialization()
 
 int Instance_map::load()
 {
-  int error;
-
-  error= process_default_option_files("my", process_option, (void *) this);
-
-  complete_initialization();
+  if (process_default_option_files("my", process_option, (void *) this) ||
+      complete_initialization())
+    return 1;
 
-  return error;
+  return 0;
 }
 
 

server-tools/instance-manager/instance_map.h

@@ -72,7 +72,7 @@ public:
   /* adds instance to internal hash */
   int add_instance(Instance *instance);
   /* inits instances argv's after all options have been loaded */
-  void complete_initialization();
+  int complete_initialization();
 
 public:
   const char *mysqld_path;

server-tools/instance-manager/instance_options.cc

@@ -74,13 +74,17 @@ err:
 }
 
 
-void Instance_options::get_pid_filename(char *result)
+int Instance_options::get_pid_filename(char *result)
 {
   const char *pid_file= mysqld_pid_file;
   char datadir[MAX_PATH_LEN];
 
   if (mysqld_datadir == NULL)
-    get_default_option(datadir, sizeof(datadir), "--datadir");
+  {
+    /* we might get an error here if we have wrong path to the mysqld binary */
+    if (get_default_option(datadir, sizeof(datadir), "--datadir"))
+      return 1;
+  }
   else
     strxnmov(datadir, MAX_PATH_LEN - 1, strchr(mysqld_datadir, '=') + 1,
              "/", NullS);
@@ -90,6 +94,7 @@ void Instance_options::get_pid_filename(char *result)
 
   /* get the full path to the pidfile */
   my_load_path(result, pid_file, datadir);
+  return 0;
 }
 
 
@@ -145,7 +150,8 @@ int Instance_options::complete_initialization(const char *default_path)
     add_option(pidfilename);
   }
 
-  get_pid_filename(pid_file_with_path);
+  if (get_pid_filename(pid_file_with_path))
+    goto err;
 
   /* we need to reserve space for the final zero + possible default options */
   if (!(argv= (char**) alloc_root(&alloc, (options_array.elements + 1

server-tools/instance-manager/instance_options.h

@@ -48,7 +48,7 @@ public:
   int add_option(const char* option);
   int init(const char *instance_name_arg);
   pid_t get_pid();
-  void get_pid_filename(char *result);
+  int get_pid_filename(char *result);
   int unlink_pidfile();
   void print_argv();
 

server-tools/instance-manager/manager.cc

@@ -77,8 +77,18 @@ void manager(const Options &options)
 
   instance_map.guardian= &guardian_thread;
 
-  if (instance_map.init() || user_map.init() || instance_map.load() ||
-      user_map.load(options.password_file_name))
+  if (instance_map.init() || user_map.init())
+      return;
+
+  if (instance_map.load())
+  {
+    log_error("Cannot init instances repository. This might be caused by "
+               "the wrong config file options. For instance, missing mysqld "
+               "binary. Aborting.");
+    return;
+    }
+
+  if (user_map.load(options.password_file_name))
     return;
 
   /* write pid file */
@@ -173,7 +183,7 @@ void manager(const Options &options)
   {
     int status= 0;
 
-    if (status= my_sigwait(&mask, &signo))
+    if ((status= my_sigwait(&mask, &signo)) != 0)
     {
       log_error("sigwait() failed");
       goto err;

server-tools/instance-manager/mysqlmanager.cc

@@ -74,7 +74,8 @@ int main(int argc, char *argv[])
   Options options;
   struct passwd *user_info;
 
-  options.load(argc, argv);
+  if (options.load(argc, argv))
+    goto err;
 
   if ((user_info= check_user(options.user)))
   {
@@ -96,6 +97,9 @@ int main(int argc, char *argv[])
   options.cleanup();
   my_end(0);
   return 0;
+err:
+  my_end(0);
+  return 1;
 }
 
 /******************* Auxilary functions implementation **********************/

server-tools/instance-manager/options.cc

@@ -207,14 +207,16 @@ C_MODE_END
   May not return.
 */
 
-void Options::load(int argc, char **argv)
+int Options::load(int argc, char **argv)
 {
+  int rc;
   /* config-file options are prepended to command-line ones */
   load_defaults("my", default_groups, &argc, &argv);
 
-  if (int rc= handle_options(&argc, &argv, my_long_options, get_one_option))
-    exit(rc);
+  if (rc= handle_options(&argc, &argv, my_long_options, get_one_option))
+    return rc;
   Options::saved_argv= argv;
+  return 0;
 }
 
 void Options::cleanup()

server-tools/instance-manager/options.h

@@ -41,7 +41,7 @@ struct Options
 
   static char **saved_argv;
 
-  static void load(int argc, char **argv);
+  static int load(int argc, char **argv);
   void cleanup();
 };
 

server-tools/instance-manager/parse_output.cc

@@ -91,8 +91,8 @@ int parse_output_and_get_value(const char *command, const char *word,
   }
 
 pclose:
-  if (pclose(output))
-    return 1;
+  /* we are not interested in the termination status */
+  pclose(output);
 
   return 0;