MDEV-17504 : add diagnostics if creation of directories fail in mysql_install_db.exe

In addition,don't remove datadir if it was not created or was not empty.

sql/CMakeLists.txt

@@ -485,7 +485,7 @@ IF(WIN32)
     COMPONENT Server
   )
   SET_TARGET_PROPERTIES(mysql_install_db PROPERTIES COMPILE_FLAGS -DINSTALL_PLUGINDIR=${INSTALL_PLUGINDIR})
-  TARGET_LINK_LIBRARIES(mysql_install_db mysys)
+  TARGET_LINK_LIBRARIES(mysql_install_db mysys shlwapi)
 
   ADD_LIBRARY(winservice STATIC winservice.c)
   TARGET_LINK_LIBRARIES(winservice shell32)

sql/mysql_install_db.cc

@@ -26,6 +26,7 @@
 #include <shellapi.h>
 #include <accctrl.h>
 #include <aclapi.h>
+#include <shlwapi.h>
 
 #define USAGETEXT \
 "mysql_install_db.exe  Ver 1.00 for Windows\n" \
@@ -93,9 +94,7 @@ static struct my_option my_long_options[]=
 
 
 static my_bool
-get_one_option(int optid, 
-   const struct my_option *opt __attribute__ ((unused)),
-   char *argument __attribute__ ((unused)))
+get_one_option(int optid, const struct my_option *,  char *)
 {
   DBUG_ENTER("get_one_option");
   switch (optid) {
@@ -109,7 +108,7 @@ get_one_option(int optid,
 }
 
 
-static void die(const char *fmt, ...)
+ATTRIBUTE_NORETURN  static void die(const char *fmt, ...)
 {
   va_list args;
   DBUG_ENTER("die");
@@ -290,7 +289,7 @@ static int create_myini()
   FILE *myini= fopen("my.ini","wt");
   if (!myini)
   {
-    die("Cannot create my.ini in data directory");
+    die("Can't create my.ini in data directory");
   }
 
   /* Write out server settings. */
@@ -308,7 +307,7 @@ static int create_myini()
 
   if (enable_named_pipe)
   {
-    fprintf(myini,"enable-named-pipe\n");
+    fprintf(myini,"named-pipe=ON\n");
   }
 
   if (opt_socket && opt_socket[0])
@@ -523,6 +522,7 @@ static int set_directory_permissions(const char *dir, const char *os_user)
 }
 
 
+
 /* Create database instance (including registering as service etc) .*/
 
 static int create_db_instance()
@@ -532,19 +532,78 @@ static int create_db_instance()
   DWORD cwd_len= MAX_PATH;
   char cmdline[3*MAX_PATH];
   FILE *in;
+  bool cleanup_datadir= true;
+  DWORD last_error;
 
   verbose("Running bootstrap");
 
   GetCurrentDirectory(cwd_len, cwd);
-  CreateDirectory(opt_datadir, NULL); /*ignore error, it might already exist */
+
+  /* Create datadir and datadir/mysql, if they do not already exist. */
+
+  if (!CreateDirectory(opt_datadir, NULL) && (GetLastError() != ERROR_ALREADY_EXISTS))
+  {
+    last_error = GetLastError();
+    switch(last_error)
+    {
+      case ERROR_ACCESS_DENIED:
+        die("Can't create data directory '%s' (access denied)\n",
+            opt_datadir);
+        break;
+      case ERROR_PATH_NOT_FOUND:
+        die("Can't create data directory '%s' "
+            "(one or more intermediate directories do not exist)\n",
+            opt_datadir);
+        break;
+      default:
+        die("Can't create data directory '%s', last error %u\n",
+         opt_datadir, last_error);
+        break;
+    }
+  }
 
   if (!SetCurrentDirectory(opt_datadir))
   {
-    die("Cannot set current directory to '%s'\n",opt_datadir);
-    return -1;
+    last_error = GetLastError();
+    switch (last_error)
+    {
+      case ERROR_DIRECTORY:
+        die("Can't set current directory to '%s', the path is not a valid directory \n",
+            opt_datadir);
+        break;
+      default:
+        die("Can' set current directory to '%s', last error %u\n",
+            opt_datadir, last_error);
+        break;
+    }
   }
 
-  CreateDirectory("mysql",NULL);
+  if (PathIsDirectoryEmpty(opt_datadir))
+  {
+    cleanup_datadir= false;
+  }
+
+  if (!CreateDirectory("mysql",NULL))
+  {
+    last_error = GetLastError();
+    DWORD attributes;
+    switch(last_error)
+    {
+      case ERROR_ACCESS_DENIED:
+        die("Can't create subdirectory 'mysql' in '%s' (access denied)\n",opt_datadir);
+        break;
+      case ERROR_ALREADY_EXISTS:
+       attributes = GetFileAttributes("mysql");
+
+       if (attributes == INVALID_FILE_ATTRIBUTES)
+         die("GetFileAttributes() failed for existing file '%s\\mysql', last error %u",
+            opt_datadir, GetLastError());
+       else if (!(attributes & FILE_ATTRIBUTE_DIRECTORY))
+         die("File '%s\\mysql' exists, but it is not a directory", opt_datadir);
+
+       break;
+    }
+  }
 
   /*
     Set data directory permissions for both current user and 
@@ -565,11 +624,11 @@ static int create_db_instance()
 
   if (setvbuf(in, NULL, _IONBF, 0))
   {
-    verbose("WARNING: Cannot disable buffering on mysqld's stdin");
+    verbose("WARNING: Can't disable buffering on mysqld's stdin");
   }
   if (fwrite("use mysql;\n",11,1, in) != 1)
   {
-    verbose("ERROR: Cannot write to mysqld's stdin");
+    verbose("ERROR: Can't write to mysqld's stdin");
     ret= 1;
     goto end;
   }
@@ -580,7 +639,7 @@ static int create_db_instance()
     /* Write the bootstrap script to stdin. */
     if (fwrite(mysql_bootstrap_sql[i], strlen(mysql_bootstrap_sql[i]), 1, in) != 1)
     {
-      verbose("ERROR: Cannot write to mysqld's stdin");
+      verbose("ERROR: Can't write to mysqld's stdin");
       ret= 1;
       goto end;
     }
@@ -649,7 +708,7 @@ static int create_db_instance()
   }
 
 end:
-  if (ret)
+  if (ret && cleanup_datadir)
   {
     SetCurrentDirectory(cwd);
     clean_directory(opt_datadir);