IM mostly fixed according to Brian's directions. Will need to do some additional option handling and cleanups

server-tools/instance-manager/Makefile.am:
  New file added
server-tools/instance-manager/client_func.c:
  typo fixed
server-tools/instance-manager/commands.cc:
  there are no admin-user snd admin-password fields anymore, so no need to show their values
server-tools/instance-manager/guardian.cc:
  Syncronization added -- now guardian wakes up whenever SIGCLD has been catched
server-tools/instance-manager/guardian.h:
  Condition variable declared
server-tools/instance-manager/instance.cc:
  Persistent connection to the instance removed. Now we use SIGTERM instead of com_shutdown for STOP. We also
  manage SIGCHLD ourselves now (therefore no double fork).
server-tools/instance-manager/instance.h:
  Pointer to the instance_map added, MySQL connection structures removed
server-tools/instance-manager/instance_map.cc:
  More syncronization added (to make proper STOP)
server-tools/instance-manager/instance_map.h:
  added condition variable and mutex for connection threads to wait for SIGCHLD
server-tools/instance-manager/instance_options.cc:
  defaults-handling methods have been added.
server-tools/instance-manager/instance_options.h:
  New functions and constants declared
server-tools/instance-manager/listener.cc:
  No changes here (bk bug?)
server-tools/instance-manager/manager.cc:
  SIGCHLD handling added

1 files changed, 113 insertions, 18 deletions

diff --git a/server-tools/instance-manager/instance_options.cc b/server-tools/instance-manager/instance_options.cc
index fab69865c85..c29f136955e 100644
--- a/server-tools/instance-manager/instance_options.cc
+++ b/server-tools/instance-manager/instance_options.cc
@@ -19,20 +19,105 @@
 #endif
 
 #include "instance_options.h"
+#include "parse_output.h"
+#include "buffer.h"
 #include <my_sys.h>
 #include <mysql.h>
 #include <signal.h>
 #include <m_string.h>
 
+
+/* option_name should be prefixed with "--" */
+int Instance_options::get_default_option(char *result, const char *option_name,
+                                         size_t result_len)
+{
+  int position= 0;
+  char verbose_option[]= " --no-defaults --verbose --help";
+  Buffer cmd;
+
+  cmd.append(position, mysqld_path, strlen(mysqld_path));
+  position+=  strlen(mysqld_path);
+  cmd.append(position, verbose_option, sizeof(verbose_option) - 1);
+  position+= sizeof(verbose_option) - 1;
+  cmd.append(position, "\0", 1);
+  /* get the value from "mysqld --help --verbose" */
+  if (parse_output_and_get_value(cmd.buffer, option_name + 2,
+                                 result, result_len))
+    return 1;
+
+  return 0;
+}
+
+
+void 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, "--datadir", MAX_PATH_LEN);
+  }
+  else
+    strxnmov(datadir, MAX_PATH_LEN - 1, strchr(mysqld_datadir, '=') + 1,
+             "/", NullS);
+
+  /* well, we should never get it */
+  if (mysqld_pid_file != NULL)
+    pid_file= strchr(pid_file, '=') + 1;
+  else
+    DBUG_ASSERT(0);
+
+  /* get the full path to the pidfile */
+  my_load_path(result, pid_file, datadir);
+
+}
+
+
+int Instance_options::unlink_pidfile()
+{
+  char pid_file_path[MAX_PATH_LEN];
+
+  /*
+    This works as we know that pid_file_path is of
+    MAX_PATH_LEN == FN_REFLEN length
+  */
+  get_pid_filename((char *)&pid_file_path);
+
+  return unlink(pid_file_path);
+}
+
+
+pid_t Instance_options::get_pid()
+{
+  char pid_file_path[MAX_PATH_LEN];
+
+  /*
+    This works as we know that pid_file_path is of
+    MAX_PATH_LEN == FN_REFLEN length
+  */
+  get_pid_filename((char *)&pid_file_path);
+
+  /* get the pid */
+  if (FILE *pid_file_stream= my_fopen(pid_file_path,
+                                      O_RDONLY | O_BINARY, MYF(0)))
+  {
+    pid_t pid;
+
+    fscanf(pid_file_stream, "%i", &pid);
+    my_fclose(pid_file_stream, MYF(0));
+    return pid;
+  }
+  else
+    return 0;
+}
+
+
 int Instance_options::complete_initialization(const char *default_path,
                                               const char *default_user,
                                               const char *default_password)
 {
-  /* we need to reserve space for the final zero + possible default options */
-  if (!(argv= (char**) alloc_root(&alloc, (options_array.elements + 1
-                       + MAX_NUMBER_OF_DEFAULT_OPTIONS) * sizeof(char*))))
-  goto err;
-
+  const char *tmp;
 
   if (mysqld_path == NULL)
   {
@@ -40,22 +125,34 @@ int Instance_options::complete_initialization(const char *default_path,
       goto err;
   }
 
-  /* this option must be first in the argv */
-  if (add_to_argv(mysqld_path))
+  if (!(tmp= strdup_root(&alloc, "--no-defaults")))
     goto err;
 
-  /* the following options are not for argv */
-  if (mysqld_user == NULL)
+  if (mysqld_pid_file == NULL)
   {
-    if (!(mysqld_user= strdup_root(&alloc, default_user)))
-      goto err;
+    char pidfilename[MAX_PATH_LEN];
+    char hostname[MAX_PATH_LEN];
+    if (!gethostname(hostname, sizeof(hostname) - 1))
+      strxnmov(pidfilename, MAX_PATH_LEN - 1, "--pid-file=", hostname, "-",
+               instance_name, ".pid", NullS);
+    else
+      strxnmov(pidfilename, MAX_PATH_LEN - 1, "--pid-file=", instance_name,
+               ".pid", NullS);
+
+    add_option(pidfilename);
   }
 
-  if (mysqld_password == NULL)
-  {
-    if (!(mysqld_password= strdup_root(&alloc, default_password)))
-      goto err;
-  }
+  /* we need to reserve space for the final zero + possible default options */
+  if (!(argv= (char**) alloc_root(&alloc, (options_array.elements + 1
+                       + MAX_NUMBER_OF_DEFAULT_OPTIONS) * sizeof(char*))))
+  goto err;
+
+  /* the path must be first in the argv */
+  if (add_to_argv(mysqld_path))
+    goto err;
+
+  if (add_to_argv(tmp))
+    goto err;
 
   memcpy((gptr) (argv + filled_default_options), options_array.buffer,
          options_array.elements*sizeof(char*));
@@ -102,8 +199,6 @@ int Instance_options::add_option(const char* option)
     {"--bind-address=", 15, &mysqld_bind_address, SAVE_WHOLE_AND_ADD},
     {"--pid-file=", 11, &mysqld_pid_file, SAVE_WHOLE_AND_ADD},
     {"--mysqld-path=", 14, &mysqld_path, SAVE_VALUE},
-    {"--admin-user=", 13, &mysqld_user, SAVE_VALUE},
-    {"--admin-password=", 17, &mysqld_password, SAVE_VALUE},
     {"--guarded", 9, &is_guarded, SAVE_WHOLE},
     {NULL, 0, NULL, 0}
   };