fix IM to display version string in "show instance status" (Bug #10229)

server-tools/instance-manager/buffer.h:
  fix for the valgring error
server-tools/instance-manager/commands.cc:
  sent the version string
server-tools/instance-manager/instance_options.cc:
  compute and store the version string
server-tools/instance-manager/instance_options.h:
  add a version string option, and added caching of the mysqld_path length
server-tools/instance-manager/options.cc:
  fix valgrind error
server-tools/instance-manager/parse_output.cc:
  Add an option to parse_output_and_get_value in order to be
  able to get the rest of the string after the found word in
  the output of popen() (E.g. a version string).
server-tools/instance-manager/parse_output.h:
  prototype changed

server-tools/instance-manager/buffer.h

@@ -52,7 +52,7 @@ public:
 
   ~Buffer()
   {
-    free(buffer);
+    my_free(buffer, MYF(0));
   }
 
 public:

server-tools/instance-manager/commands.cc

@@ -203,15 +203,14 @@ int Show_instance_status::execute(struct st_net *net,
     if (!(instance= instance_map->find(instance_name, strlen(instance_name))))
       goto err;
     if (instance->is_running())
-    {
       store_to_string(&send_buff, (char*) "online", &position);
-      store_to_string(&send_buff, "unknown", &position);
-    }
     else
-    {
       store_to_string(&send_buff, (char*) "offline", &position);
+
+    if (instance->options.mysqld_version)
+      store_to_string(&send_buff, instance->options.mysqld_version, &position);
+    else
       store_to_string(&send_buff, (char*) "unknown", &position);
-    }
 
 
     if (send_buff.is_error() ||

server-tools/instance-manager/instance_options.cc

@@ -27,6 +27,39 @@
 #include <signal.h>
 #include <m_string.h>
 
+#ifdef __WIN__
+#define NEWLINE_LEN 2
+#else
+#define NEWLINE_LEN 1
+#endif
+
+
+/* Create "mysqld ..." command in the buffer */
+
+static inline int create_mysqld_command(Buffer *buf,
+                                        const char *mysqld_path_str,
+                                        uint mysqld_path_len,
+                                        const char *option,
+                                        uint option_len)
+{
+  int position= 0;
+
+  if (buf->get_size()) /* malloc succeeded */
+  {
+    buf->append(position, mysqld_path_str, mysqld_path_len);
+    position+= mysqld_path_len;
+    /* here the '\0' character is copied from the option string */
+    buf->append(position, option, option_len);
+
+    if (buf->is_error())
+      return 1;
+  }
+  else
+    return 1;
+
+  return 0;
+}
+
 
 /*
   Get compiled-in value of default_option
@@ -50,44 +83,83 @@
 int Instance_options::get_default_option(char *result, size_t result_len,
                                          const char *option_name)
 {
-  int position= 0;
   int rc= 1;
   char verbose_option[]= " --no-defaults --verbose --help";
 
-  Buffer cmd(strlen(mysqld_path) + sizeof(verbose_option) + 1);
-  if (cmd.get_size()) /* malloc succeeded */
-  {
-    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);
+  /* reserve space fot the path + option + final '\0' */
+  Buffer cmd(mysqld_path_len + sizeof(verbose_option));
 
-    if (cmd.is_error())
-      goto err;
-    /* get the value from "mysqld --help --verbose" */
-    rc= parse_output_and_get_value(cmd.buffer, option_name + 2,
+  if (create_mysqld_command(&cmd, mysqld_path, mysqld_path_len,
+                            verbose_option, sizeof(verbose_option)))
+    goto err;
+
+  /* +2 eats first "--" from the option string (E.g. "--datadir") */
+  rc= parse_output_and_get_value(cmd.buffer, option_name + 2,
                                    result, result_len);
+
+  return rc;
+err:
+  return 1;
+}
+
+
+/*
+  Fill mysqld_version option (used at initialization stage)
+
+  SYNOPSYS
+    fill_instance_version()
+
+  DESCRIPTION
+
+  Get mysqld version string from "mysqld --version" output.
+
+  RETURN
+    0 - ok
+    1 - error occured
+*/
+
+int Instance_options::fill_instance_version()
+{
+  enum { MAX_VERSION_STRING_LENGTH= 160 };
+  enum { RETURN_LINE= 1 };
+  char result[MAX_VERSION_STRING_LENGTH];
+  char version_option[]= " --version";
+  int rc= 1;
+  Buffer cmd(mysqld_path_len + sizeof(version_option));
+
+  if (create_mysqld_command(&cmd, mysqld_path, mysqld_path_len,
+                            version_option, sizeof(version_option)))
+    goto err;
+
+  rc= parse_output_and_get_value(cmd.buffer, mysqld_path,
+                                 result, MAX_VERSION_STRING_LENGTH,
+                                 RETURN_LINE);
+
+  if (*result != '\0')
+  {
+    /* chop the newline from the end of the version string */
+    result[strlen(result) - NEWLINE_LEN]= '\0';
+    mysqld_version= strdup_root(&alloc, result);
   }
 
   return rc;
+
 err:
   return 1;
 }
 
 
 /*
-  Get compiled-in value of default_option
+  Fill various log options
 
   SYNOPSYS
-    get_default_option()
-    result            buffer to put found value
-    result_len        buffer size
-    option_name       the name of the option, prefixed with "--"
+    fill_log_options()
 
   DESCRIPTION
 
-   Get compile-in value of requested option from server
+  Compute paths to enabled log files. If the path is not specified in the
+  instance explicitly (I.e. log=/home/user/mysql.log), we try to guess the
+  file name and placement.
 
   RETURN
     0 - ok
@@ -276,6 +348,8 @@ int Instance_options::complete_initialization(const char *default_path,
       goto err;
   }
 
+  mysqld_path_len= strlen(mysqld_path);
+
   if (mysqld_port)
     mysqld_port_val= atoi(strchr(mysqld_port, '=') + 1);
 
@@ -330,7 +404,8 @@ int Instance_options::complete_initialization(const char *default_path,
          options_array.elements*sizeof(char*));
   argv[filled_default_options + options_array.elements]= 0;
 
-  fill_log_options();
+  if (fill_log_options() || fill_instance_version())
+    goto err;
 
   return 0;
 

server-tools/instance-manager/instance_options.h

@@ -38,7 +38,7 @@ class Instance_options
 {
 public:
   Instance_options() :
-    mysqld_socket(0), mysqld_datadir(0),
+    mysqld_version(0), mysqld_socket(0), mysqld_datadir(0),
     mysqld_bind_address(0), mysqld_pid_file(0), mysqld_port(0),
     mysqld_port_val(0), mysqld_path(0), nonguarded(0), shutdown_delay(0),
     shutdown_delay_val(0), filled_default_options(0)
@@ -64,6 +64,11 @@ public:
   enum { MEM_ROOT_BLOCK_SIZE= 512 };
   char pid_file_with_path[MAX_PATH_LEN];
   char **argv;
+  /*
+    Here we cache the version string, obtained from mysqld --version.
+    In the case when mysqld binary is not found we get "unknown" here.
+  */
+  const char *mysqld_version;
   /* We need the some options, so we store them as a separate pointers */
   const char *mysqld_socket;
   const char *mysqld_datadir;
@@ -74,6 +79,7 @@ public:
   const char *instance_name;
   uint instance_name_len;
   const char *mysqld_path;
+  uint mysqld_path_len;
   const char *nonguarded;
   const char *shutdown_delay;
   uint shutdown_delay_val;
@@ -84,6 +90,7 @@ public:
   DYNAMIC_ARRAY options_array;
 private:
   int fill_log_options();
+  int fill_instance_version();
   int add_to_argv(const char *option);
   int get_default_option(char *result, size_t result_len,
                          const char *option_name);

server-tools/instance-manager/options.cc

@@ -224,10 +224,10 @@ int Options::load(int argc, char **argv)
 
   /* config-file options are prepended to command-line ones */
   load_defaults("my", default_groups, &argc, &argv);
+  Options::saved_argv= argv;
 
   if ((rc= handle_options(&argc, &argv, my_long_options, get_one_option)) != 0)
     return rc;
-  Options::saved_argv= argv;
   return 0;
 }
 

server-tools/instance-manager/parse_output.cc

@@ -32,10 +32,13 @@
     word         the word to look for (usually an option name)
     result       the buffer to store the next word (option value)
     result_len   self-explanatory
+    get_all_line flag, which is set if we want to get all the line after
+                 the matched word.
 
   DESCRIPTION
 
     Parse output of the "command". Find the "word" and return the next one
+    if get_all_line is 0. Return the rest of the parsed string otherwise.
 
   RETURN
     0 - ok
@@ -43,7 +46,8 @@
 */
 
 int parse_output_and_get_value(const char *command, const char *word,
-                               char *result, size_t result_len)
+                               char *result, size_t result_len,
+                               int get_all_line)
 {
   FILE *output;
   uint wordlen;
@@ -81,11 +85,19 @@ int parse_output_and_get_value(const char *command, const char *word,
         an option value.
       */
       linep+= lineword_len;                     /* swallow the previous one */
-      get_word((const char **) &linep, &lineword_len, NONSPACE);
-      if (result_len <= lineword_len)
-        goto err;
-      strncpy(result, linep, lineword_len);
-      result[lineword_len]= '\0';
+      if (!get_all_line)
+      {
+        get_word((const char **) &linep, &lineword_len, NONSPACE);
+        if (result_len <= lineword_len)
+          goto err;
+        strncpy(result, linep, lineword_len);
+        result[lineword_len]= '\0';
+      }
+      else
+      {
+        strncpy(result, linep, result_len);
+        result[result_len]= '\0'; /* safety */
+      }
       goto pclose;
     }
   }

server-tools/instance-manager/parse_output.h

@@ -17,6 +17,7 @@
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
 int parse_output_and_get_value(const char *command, const char *word,
-                               char *result, size_t result_len);
+                               char *result, size_t result_len,
+                               int get_all_line= 0);
 
 #endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_PARSE_OUTPUT_H */