Bug#28012 Patch : IM crashes instead of reporting an error when mysqldpath is bad

  
On the windows platform, if an instance object failed to initialize during
program start, the instance manager would crash.
This could happen if an incorrect mysqld path was supplied in the 
defaults configuration file.
The patch prevents the program from crashing and makes it show an
error message instead.


mysql-test/r/im_options.result:
  - Options have changed names.
server-tools/instance-manager/instance.cc:
  - Added code to verify that the instance object was initialized
    before any attempt is made to start the associated process.
  - Instance::complete_initialization method will now return TRUE
    on an error during instance initialization.
server-tools/instance-manager/instance_options.cc:
  - Parsed result byte sequence from executed process doesn't contain a new line
    character anymore.
server-tools/instance-manager/parse_output.cc:
  - 'popen' didn't behave as intended on the windows platform.
  - The function parse_output_and_get_value was completly rewritten to correct the
    error in the windows built and to be more easily maintained across platforms.
server-tools/instance-manager/parse_output.h:
  - 'popen' didn't behave as intended on the windows platform.
  - The function parse_output_and_get_value was completly rewritten to correct the
    error in the windows built and to be more easily maintained across platforms.
server-tools/instance-manager/portability.h:
  - Add more portability constants for convenience.

mysql-test/r/im_options.result

@@ -37,9 +37,10 @@ log-slow-queries	option_value
 language	option_value
 character-sets-dir	option_value
 basedir	option_value
+shutdown-delay	option_value
 skip-stack-trace	option_value
-skip-innodb	option_value
-skip-ndbcluster	option_value
+loose-skip-innodb	option_value
+loose-skip-ndbcluster	option_value
 nonguarded	option_value
 log-output	option_value
 SET mysqld2.server_id = 2;
@@ -57,9 +58,10 @@ log-slow-queries	option_value
 language	option_value
 character-sets-dir	option_value
 basedir	option_value
+shutdown-delay	option_value
 skip-stack-trace	option_value
-skip-innodb	option_value
-skip-ndbcluster	option_value
+loose-skip-innodb	option_value
+loose-skip-ndbcluster	option_value
 nonguarded	option_value
 log-output	option_value
 server_id	option_value

server-tools/instance-manager/instance.cc

@@ -524,24 +524,17 @@ bool Instance::init(const LEX_STRING *name_arg)
 
 
 /**
-  Complete instance options initialization.
+  @brief Complete instance options initialization.
 
-  SYNOPSIS
-    complete_initialization()
-
-  RETURN
-    FALSE - ok
-    TRUE  - error
+  @return Error status.
+    @retval FALSE ok
+    @retval TRUE error
 */
 
 bool Instance::complete_initialization()
 {
   configured= ! options.complete_initialization();
-  return FALSE;
-  /*
-    TODO: return actual status (from
-    Instance_options::complete_initialization()) here.
-  */
+  return !configured;
 }
 
 /**************************************************************************
@@ -644,25 +637,24 @@ bool Instance::is_mysqld_running()
 
 
 /**
-  Start mysqld.
+  @brief Start mysqld.
 
-  SYNOPSIS
-    start_mysqld()
-
-  DESCRIPTION
   Reset flags and start Instance Monitor thread, which will start mysqld.
 
-    MT-NOTE: instance must be locked before calling the operation.
+  @note Instance must be locked before calling the operation.
 
-  RETURN
-    FALSE - ok
-    TRUE  - could not start instance
+  @return Error status code
+    @retval FALSE Ok
+    @retval TRUE Could not start instance
 */
 
 bool Instance::start_mysqld()
 {
   Instance_monitor *instance_monitor;
 
+  if (!configured)
+    return TRUE;
+
   /*
     Prepare instance to start Instance Monitor thread.
 

server-tools/instance-manager/instance_options.cc

@@ -156,7 +156,8 @@ int Instance_options::get_default_option(char *result, size_t result_len,
     goto err;
 
   /* +2 eats first "--" from the option string (E.g. "--datadir") */
-  rc= parse_output_and_get_value((char*) cmd.buffer, option_name + 2,
+  rc= parse_output_and_get_value((char*) cmd.buffer,
+                                 option_name + 2, strlen(option_name + 2),
                                  result, result_len, GET_VALUE);
 err:
   return rc;
@@ -194,8 +195,8 @@ bool Instance_options::fill_instance_version()
 
   bzero(result, MAX_VERSION_LENGTH);
 
-  if (parse_output_and_get_value((char*) cmd.buffer, "Ver", result,
-                                 MAX_VERSION_LENGTH, GET_LINE))
+  if (parse_output_and_get_value((char*) cmd.buffer, STRING_WITH_LEN("Ver"),
+                                 result, MAX_VERSION_LENGTH, GET_LINE))
   {
     log_error("Failed to get version of '%s': unexpected output.",
               (const char *) mysqld_path.str);
@@ -206,8 +207,7 @@ bool Instance_options::fill_instance_version()
 
   {
     char *start;
-    /* chop the newline from the end of the version string */
-    result[strlen(result) - NEWLINE_LEN]= '\0';
+
     /* trim leading whitespaces */
     start= result;
     while (my_isspace(default_charset_info, *start))
@@ -255,7 +255,8 @@ bool Instance_options::fill_mysqld_real_path()
 
   bzero(result, FN_REFLEN);
 
-  if (parse_output_and_get_value((char*) cmd.buffer, "Usage: ",
+  if (parse_output_and_get_value((char*) cmd.buffer,
+                                 STRING_WITH_LEN("Usage: "),
                                  result, FN_REFLEN,
                                  GET_LINE))
   {

server-tools/instance-manager/parse_output.h

@@ -17,11 +17,17 @@
 
 #include <my_global.h>
 
-#define GET_VALUE 1
-#define GET_LINE  2
+enum enum_option_type
+{
+  GET_VALUE = 1,
+  GET_LINE
+};
 
-int parse_output_and_get_value(const char *command, const char *word,
-                               char *result, size_t input_buffer_len,
-                               uint flag);
+bool parse_output_and_get_value(const char *command,
+                                const char *option_name_str,
+                                uint option_name_length,
+                                char *option_value_buf,
+                                size_t option_value_buf_size,
+                                enum_option_type option_type);
 
 #endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_PARSE_OUTPUT_H */

server-tools/instance-manager/portability.h

@@ -48,11 +48,16 @@ typedef int pid_t;
 #define NEWLINE "\r\n"
 #define NEWLINE_LEN 2
 
+const char CR = '\r';
+const char LF = '\n';
+
 #else /* ! __WIN__ */
 
 #define NEWLINE "\n"
 #define NEWLINE_LEN 1
 
+const char LF = '\n';
+
 #endif /* __WIN__ */
 
 #endif  /* INCLUDES_MYSQL_INSTANCE_MANAGER_PORTABILITY_H */