Commit d50eaa9f authored by unknown's avatar unknown
Browse files

Add "--instance=name" option to load_defaults (or env(MYSQL_INSTANCE)) 

       which enables having multiple mysqld in same my.cnf 
       without mysql_multi or IM


include/my_sys.h:
  extern instance name
parent c72c3e4c

include/my_sys.h

+1 −0
Original line number Diff line number Diff line
@@ -263,6 +263,7 @@ extern my_bool NEAR my_disable_locking,NEAR my_disable_async_io, 
extern char	wild_many,wild_one,wild_prefix;

extern const char *charsets_dir;

extern char *defaults_extra_file;

extern  const char *defaults_instance;



extern my_bool timed_mutexes;

mysys/default.c

+59 −1
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
 --defaults-file=full-path-to-default-file	; Only this file will be read.

 --defaults-extra-file=full-path-to-default-file ; Read this file before ~/

 --print-defaults	; Print the modified command line and exit

 --instance ; also read groups with concat(group, instance)

****************************************************************************/



#include "mysys_priv.h"
@@ -41,6 +42,8 @@ 
#include <winbase.h>

#endif



const char *defaults_instance=0;

static const char instance_option[] = "--instance=";

char *defaults_extra_file=0;



/* Which directories are searched for options (and in which order) */
@@ -115,7 +118,7 @@ int my_search_option_files(const char *conf_file, int *argc, char ***argv, 
  DBUG_ENTER("my_search_option_files");



  /* Check if we want to force the use a specific default file */

  get_defaults_files(*argc, *argv,

  get_defaults_files(*argc - *args_used, *argv + *args_used,

                      (char **)&forced_default_file,

                      (char **)&forced_extra_defaults);

  if (forced_default_file)
@@ -325,6 +328,49 @@ int load_defaults(const char *conf_file, const char **groups, 
  ctx.args= &args;

  ctx.group= &group;



  if (*argc >= 2 + args_used && 

      is_prefix(argv[0][1+args_used], instance_option))

  {

    args_used++;

    defaults_instance= argv[0][args_used]+sizeof(instance_option)-1;

  }

  else 

  {

    defaults_instance= getenv("MYSQL_INSTANCE");

  }

  

  if (defaults_instance)

  {

    /** Handle --instance= */

    uint i, len;

    const char **extra_groups;

    const uint instance_len= strlen(defaults_instance);

    

    if (!(extra_groups= 

	  (const char**)alloc_root(&alloc, (2*group.count+1)*sizeof(char*))))

      goto err;

    

    for (i= 0; i<group.count; i++)

    {

      extra_groups[i]= group.type_names[i]; /** copy group */

      

      len= strlen(extra_groups[i]);

      if (!(ptr= alloc_root(&alloc, len+instance_len+1)))

	goto err;

      

      extra_groups[i+group.count]= ptr;

      

      /** Construct new group */

      memcpy(ptr, extra_groups[i], len);

      ptr+= len;

      memcpy(ptr, defaults_instance, instance_len+1);

    }

    

    group.count*= 2;

    group.type_names= extra_groups;

    group.type_names[group.count]= 0;

  }

  

  error= my_search_option_files(conf_file, argc, argv, &args_used,

                      handle_default_option, (void *) &ctx);

  /*
@@ -794,6 +840,7 @@ void my_print_default_files(const char *conf_file) 


void print_defaults(const char *conf_file, const char **groups)

{

  const char **groups_save= groups;

  my_print_default_files(conf_file);



  fputs("The following groups are read:",stdout);
@@ -802,6 +849,17 @@ void print_defaults(const char *conf_file, const char **groups) 
    fputc(' ',stdout);

    fputs(*groups,stdout);

  }



  if (defaults_instance)

  {

    groups= groups_save;

    for ( ; *groups ; groups++)

    {

      fputc(' ',stdout);

      fputs(*groups,stdout);

      fputs(defaults_instance,stdout);

    }

  }

  puts("\nThe following options may be given as the first argument:\n\

--print-defaults	Print the program argument list and exit\n\

--no-defaults		Don't read default options from any options file\n\