Windows fixes

 - Use pipes "|"
 - Improved system command, create a temporary .sh faile that is executed  with cygwins sh(bash)
   This makes the Windows version behave exactly as the Lunix version(well almost...) 
 - Give unix path to DBUG, trace files is no produced if running ./mysql-test-run.pl --debug"


client/mysqltest.c:
  Add new function "my_system" that run the <command> a she script using cygwin bash on windows.
mysql-test/lib/mtr_misc.pl:
  Return all paths to executables in windows format "c:\src\.." when run on windows.
  This makes it possible to use the pipes "|" to pipöe the output form exeample "mysqlbinlog" into "mysql"
mysql-test/mysql-test-run.pl:
  DBUG want's a unix format strings for where it should put the tracefile(don't ask me why but it works)
  Just chop of the first "c:" from the "c:/src/.." string and DBUG will be happy

client/mysqltest.c

@@ -1351,6 +1351,35 @@ int do_modify_var(struct st_query *query, const char *name,
 }
 
 
+/*
+  Wrapper for 'system' function
+
+  NOTE
+   If mysqltest is executed from cygwin shell, the command will be
+   executed in the "windows command interpreter" cmd.exe and we prepend "sh"
+   to make it be executed by cygwins "bash". Thus commands like "rm",
+   "mkdir" as well as shellscripts can executed by "system" in Windows.
+
+*/
+
+int my_system(DYNAMIC_STRING* ds_cmd)
+{
+#ifdef __WIN__
+  /* Dump the command into a sh script file and execute with "sh" */
+  int err;
+  char tmp_sh_name[64], tmp_sh_cmd[70];
+  my_snprintf(tmp_sh_name, sizeof(tmp_sh_name), "tmp_%d.sh", getpid());
+  my_snprintf(tmp_sh_cmd, sizeof(tmp_sh_cmd), "sh %s", tmp_sh_name);
+  str_to_file(tmp_sh_name, ds_cmd->str, ds_cmd->length);
+  err= system(tmp_sh_cmd);
+  my_delete(tmp_sh_name, MYF(0));
+  return err;
+#else
+  return system(ds_cmd->str);
+#endif
+}
+
+
 /*
 
   SYNOPSIS
@@ -1363,37 +1392,24 @@ int do_modify_var(struct st_query *query, const char *name,
     Eval the query to expand any $variables in the command.
     Execute the command with the "system" command.
 
-  NOTE
-   If mysqltest is executed from cygwin shell, the command will be
-   executed in the "windows command interpreter" cmd.exe and we prepend "sh"
-   to make it be executed by cygwins "bash". Thus commands like "rm",
-   "mkdir" as well as shellscripts can executed by "system" in Windows.
- */
+*/
 
-int do_system(struct st_query *command)
+void do_system(struct st_query *command)
 {
   DYNAMIC_STRING ds_cmd;
+  DBUG_ENTER("do_system");
 
   if (strlen(command->first_argument) == 0)
     die("Missing arguments to system, nothing to do!");
 
   init_dynamic_string(&ds_cmd, 0, strlen(command->first_argument) + 64, 256);
 
-#ifdef __WIN__
-  /* Execute the command in "bash", ie. sh -c "<command>" */
-  dynstr_append(&ds_cmd, "sh -c \"");
-#endif
-
   /* Eval the system command, thus replacing all environment variables */
   do_eval(&ds_cmd, command->first_argument, TRUE);
 
-#ifdef __WIN__
-  dynstr_append(&ds_cmd, "\"");
-#endif
-
   DBUG_PRINT("info", ("running system command '%s' as '%s'",
                       command->first_argument, ds_cmd.str));
-  if (system(ds_cmd.str))
+  if (my_system(&ds_cmd))
   {
     if (command->abort_on_error)
       die("system command '%s' failed", command->first_argument);
@@ -1405,7 +1421,7 @@ int do_system(struct st_query *command)
   }
 
   command->last_argument= command->end;
-  return 0;
+  DBUG_VOID_RETURN;
 }
 
 
@@ -1656,7 +1672,7 @@ int do_sleep(struct st_query *query, my_bool real_sleep)
   char *p= query->first_argument;
   char *sleep_start, *sleep_end= query->end;
   double sleep_val;
-  char *cmd = (real_sleep ? "real_sleep" : "sleep");
+  const char *cmd = (real_sleep ? "real_sleep" : "sleep");
 
   while (my_isspace(charset_info, *p))
     p++;

mysql-test/lib/mtr_misc.pl

@@ -96,7 +96,16 @@ sub mtr_exe_exists (@) {
   map {$_.= ".exe"} @path if $::glob_win32;
   foreach my $path ( @path )
   {
-    return $path if -x $path;
+    if ( -x $path )
+    {
+      if ( $::glob_cygwin_perl )
+      {
+        $path= `cygpath -w $path`;
+	# Chop off the \n that cygpath adds
+        $path=~ s/\n//;
+      }
+      return $path;
+    }
   }
   if ( @path == 1 )
   {

mysql-test/mysql-test-run.pl

@@ -668,6 +668,9 @@ sub command_line_setup () {
     $opt_vardir= "$glob_mysql_test_dir/var";
   }
   $opt_vardir_trace= $opt_vardir;
+  # Chop off any "c:", DBUG likes a unix path ex: c:/src/... => /src/...
+  $opt_vardir_trace=~ s/^\w://;
+
   # We make the path absolute, as the server will do a chdir() before usage
   unless ( $opt_vardir =~ m,^/, or
            ($glob_win32 and $opt_vardir =~ m,^[a-z]:/,i) )