WL #2713 Change IM behaviour so, that it only reads and alters one config file only.

Implemented on brian's request.


server-tools/instance-manager/Makefile.am:
  define default config file
server-tools/instance-manager/commands.cc:
  Use specified or default file to edit with SET commands instead of hardcoded file
server-tools/instance-manager/commands.h:
  add member to SET commands
server-tools/instance-manager/instance_map.cc:
  rename first_option -> single_defaults_option, made logging a bit more verbose
server-tools/instance-manager/instance_map.h:
  rename first_option -> single_defaults_file + made it public
server-tools/instance-manager/manager.cc:
  rename first_option -> single_defaults_file
server-tools/instance-manager/mysqlmanager.cc:
  goto generic error label instead of simple return
server-tools/instance-manager/options.cc:
  skip --defaults-extra file and give a message if it was specified, made IM
  to read one config file only
server-tools/instance-manager/options.h:
  added new members to the option structure

server-tools/instance-manager/Makefile.am

@@ -34,6 +34,7 @@ liboptions_a_CXXFLAGS= $(CXXFLAGS) \
 	-DDEFAULT_MYSQLD_PATH="$(libexecdir)/mysqld$(EXEEXT)" \
 	-DDEFAULT_MONITORING_INTERVAL="20" \
 	-DDEFAULT_PORT="2273" \
+        -DDEFAULT_CONFIG_FILE="/etc/my.cnf" \
 	-DPROTOCOL_VERSION=@PROTOCOL_VERSION@
 
 liboptions_a_SOURCES= options.h options.cc priv.h priv.cc

server-tools/instance-manager/commands.cc

@@ -22,6 +22,7 @@
 #include "mysql_manager_error.h"
 #include "protocol.h"
 #include "buffer.h"
+#include "options.h"
 
 #include <m_string.h>
 #include <mysql.h>
@@ -643,6 +644,12 @@ Set_option::Set_option(Instance_map *instance_map_arg,
   if ((instance= instance_map->find(name, len)))
   {
     instance_name= instance->options.instance_name;
+    if (instance_map->single_defaults_file_option != NULL)
+      single_defaults_file=
+        strchr(instance_map->single_defaults_file_option, '=') + 1;
+    else
+      single_defaults_file= NULL;
+
      /* add prefix for add_option */
     if ((option_len_arg < MAX_OPTION_LEN - 1) ||
         (option_value_len_arg < MAX_OPTION_LEN - 1))
@@ -689,15 +696,26 @@ int Set_option::correct_file(int skip)
 {
   int error;
 
-  error= modify_defaults_file("/etc/my.cnf", option,
-			      option_value, instance_name, skip);
-  if (error > 0)
+  if (single_defaults_file != NULL)
+    error= modify_defaults_file(single_defaults_file, option,
+                                option_value, instance_name, skip);
+  else
+    error= modify_defaults_file(Options::default_config_file, option,
+                                option_value, instance_name, skip);
+
+  switch (error)
+  {
+  case 0:
+    return 0;                                   /* everything was fine */
+  case 1:
     return ER_OUT_OF_RESOURCES;
-  else if (error < 0)
+  case 2:
     return ER_ACCESS_OPTION_FILE;
+  default:
+    DBUG_ASSERT(0);                           /* should never get here */
+  }
 
-  /* everything was fine */
-  return 0;
+  return 0;                                   /* keep compiler happy */
 }
 
 

server-tools/instance-manager/commands.h

@@ -187,6 +187,7 @@ protected:
 public:
   const char *instance_name;
   uint instance_name_len;
+  const char *single_defaults_file;
   /* buffer for the option */
   enum { MAX_OPTION_LEN= 1024 };
   char option[MAX_OPTION_LEN];

server-tools/instance-manager/instance_map.cc

@@ -22,6 +22,8 @@
 
 #include "buffer.h"
 #include "instance.h"
+#include "log.h"
+#include "options.h"
 
 #include <m_ctype.h>
 #include <mysql_com.h>
@@ -112,8 +114,9 @@ C_MODE_END
 
 
 Instance_map::Instance_map(const char *default_mysqld_path_arg,
-                           const char *first_option_arg):
-mysqld_path(default_mysqld_path_arg), first_option(first_option_arg)
+                           const char *single_defaults_file_option_arg):
+mysqld_path(default_mysqld_path_arg),
+single_defaults_file_option(single_defaults_file_option_arg)
 {
   pthread_mutex_init(&LOCK_instance_map, 0);
 }
@@ -202,7 +205,8 @@ int Instance_map::complete_initialization()
       hash_free should handle it's deletion => goto err, not
       err_instance.
     */
-    if (instance->complete_initialization(this, mysqld_path, DEFAULT_SINGLE_INSTANCE))
+    if (instance->complete_initialization(this, mysqld_path,
+                                          DEFAULT_SINGLE_INSTANCE))
       goto err;
   }
   else
@@ -236,18 +240,25 @@ int Instance_map::load()
 
   /* the name of the program may be orbitrary here in fact */
   argv_options[0]= "mysqlmanager";
-  if (first_option != NULL)
+  if (single_defaults_file_option != NULL)
   {
     argc= 2;
-    argv_options[1]= first_option;
+    argv_options[1]= single_defaults_file_option;
     argv_options[2]= '\0';
   }
   else
     argv_options[1]= '\0';
 
-  if (my_search_option_files("my", &argc, (char ***) &argv, &args_used,
-                             process_option, (void*) this) ||
-      complete_initialization())
+  /*
+    If the routine failed, we'll simply fallback to defaults in
+    complete_initialization().
+  */
+  if (my_search_option_files(Options::default_config_file, &argc,
+                             (char ***) &argv, &args_used,
+                             process_option, (void*) this))
+    log_info("Falling back to compiled-in defaults");
+
+  if (complete_initialization())
     return 1;
 
   return 0;

server-tools/instance-manager/instance_map.h

@@ -65,7 +65,7 @@ public:
   int init();
 
   Instance_map(const char *default_mysqld_path_arg,
-               const char *first_option_arg);
+               const char *single_defaults_file_option_arg);
   ~Instance_map();
 
   /* loads options from config files */
@@ -77,10 +77,10 @@ public:
 
 public:
   const char *mysqld_path;
+  const char *single_defaults_file_option;
   Guardian_thread *guardian;
 
 private:
-  const char *first_option;
   enum { START_HASH_SIZE = 16 };
   pthread_mutex_t LOCK_instance_map;
   HASH hash;

server-tools/instance-manager/manager.cc

@@ -68,7 +68,8 @@ void manager(const Options &options)
   */
 
   User_map user_map;
-  Instance_map instance_map(options.default_mysqld_path, options.first_option);
+  Instance_map instance_map(options.default_mysqld_path,
+                            options.single_defaults_file_option);
   Guardian_thread guardian_thread(thread_registry,
                                   &instance_map,
                                   options.monitoring_interval);

server-tools/instance-manager/mysqlmanager.cc

@@ -83,7 +83,7 @@ int main(int argc, char *argv[])
       if (set_user(options.user, user_info))
       {
         options.cleanup();
-        return 1;
+        goto err;
       }
   }
 

server-tools/instance-manager/options.cc

@@ -36,7 +36,8 @@ const char *Options::pid_file_name= QUOTE(DEFAULT_PID_FILE_NAME);
 const char *Options::socket_file_name= QUOTE(DEFAULT_SOCKET_FILE_NAME);
 const char *Options::password_file_name= QUOTE(DEFAULT_PASSWORD_FILE_NAME);
 const char *Options::default_mysqld_path= QUOTE(DEFAULT_MYSQLD_PATH);
-const char *Options::first_option= 0;           /* No default value */
+const char *Options::default_config_file= QUOTE(DEFAULT_CONFIG_FILE);
+const char *Options::single_defaults_file_option= 0; /* No default value */
 const char *Options::bind_address= 0;           /* No default value */
 const char *Options::user= 0;                   /* No default value */
 uint Options::monitoring_interval= DEFAULT_MONITORING_INTERVAL;
@@ -204,31 +205,69 @@ C_MODE_END
 
 
 /*
-  - call load_defaults to load configuration file section
+  - Process argv of original program: get tid of --defaults-extra-file
+    and print a message if met there.
+  - call load_defaults to load configuration file section and save the pointer
+    for free_defaults.
   - call handle_options to assign defaults and command-line arguments
-  to the class members
-  if either of these function fail, exit the program
-  May not return.
+  to the class members.
+  if either of these function fail, return the error code.
 */
 
 int Options::load(int argc, char **argv)
 {
   int rc;
+  char **original_argv;
+  int original_argc;
+  char *original_argv_buff[1024];
+  int use_new_argv= 0;
 
-  if (argc >= 2)
+  saved_argv= argv;
+  original_argv= original_argv_buff;
+  original_argc= argc;
+
+  if (argc >= 2 && is_prefix(argv[1],"--defaults-file="))
   {
-    if (is_prefix(argv[1],"--defaults-file=") ||
-        is_prefix(argv[1],"--defaults-extra-file="))
-      Options::first_option= argv[1];
+    if (is_prefix(argv[1],"--defaults-file="))
+    {
+      /* set --defaults-file, so that we read only this file */
+      Options::single_defaults_file_option= argv[1];
+    }
+    if (is_prefix(argv[1],"--defaults-extra-file="))
+    {
+      int argv_pos= 1;
+
+      original_argv[0]= argv[0];
+      use_new_argv= 1;
+      /* skip --defaullts-extra-file */
+      while (++argv_pos != argc)
+        original_argv[argv_pos]=argv[argv_pos];
+      original_argv[argv_pos]= 0;
+      /* the log is not enabled yet */
+      fprintf(stderr, "--defaults-extra-file is not supported by IM."
+              " Skipping the option. \n");
+      original_argc--;
+    }
   }
 
+  /* here load_defaults will save pointer to free allocated memory */
+  if (use_new_argv)
+    saved_argv= original_argv;
+  else
+    saved_argv= argv;
+
   /* config-file options are prepended to command-line ones */
-  load_defaults("my", default_groups, &argc, &argv);
-  Options::saved_argv= argv;
+  load_defaults(default_config_file, default_groups, &original_argc,
+                &saved_argv);
+
+  if ((rc= handle_options(&original_argc, &saved_argv, my_long_options,
+                          get_one_option)) != 0)
+    goto err;
 
-  if ((rc= handle_options(&argc, &argv, my_long_options, get_one_option)) != 0)
-    return rc;
   return 0;
+
+err:
+  return rc;
 }
 
 void Options::cleanup()

server-tools/instance-manager/options.h

@@ -36,11 +36,13 @@ struct Options
   static const char *default_mysqld_path;
   static const char *user;
   /* the option which should be passed to process_default_option_files */
-  static const char *first_option;
+  static const char *single_defaults_file_option;
   static uint monitoring_interval;
   static uint port_number;
   static const char *bind_address;
+  static const char *default_config_file;
 
+  /* argv pointer returned by load_defaults() to be used by free_defaults() */
   static char **saved_argv;
 
   static int load(int argc, char **argv);