mingw: cope with the Isilon network file system

On certain network filesystems (currently encountered with Isilon, but
in theory more network storage solutions could be causing the same
issue), when the directory in question is missing,
`raceproof_create_file()` fails with an `ERROR_INVALID_PARAMETER`
instead of an `ERROR_PATH_NOT_FOUND`.

Since it is highly unlikely that we produce such an error by mistake
(the parameters we pass are fairly benign), we can be relatively certain
that the directory is missing in this instance. So let's just translate
that error automagically.

This fixes #1345.

Signed-off-by: Nathan Sanders <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: naatje80

compat/mingw.c

@@ -460,8 +460,21 @@ static int mingw_open_append(wchar_t const *wfilename, int oflags, ...)
 	handle = CreateFileW(wfilename, FILE_APPEND_DATA,
 			FILE_SHARE_WRITE | FILE_SHARE_READ,
 			NULL, create, FILE_ATTRIBUTE_NORMAL, NULL);
-	if (handle == INVALID_HANDLE_VALUE)
-		return errno = err_win_to_posix(GetLastError()), -1;
+	if (handle == INVALID_HANDLE_VALUE) {
+		DWORD err = GetLastError();
+
+		/*
+		 * Some network storage solutions (e.g. Isilon) might return
+		 * ERROR_INVALID_PARAMETER instead of expected error
+		 * ERROR_PATH_NOT_FOUND, which results in an unknown error. If
+		 * so, let's turn the error to ERROR_PATH_NOT_FOUND instead.
+		 */
+		if (err == ERROR_INVALID_PARAMETER)
+			err = ERROR_PATH_NOT_FOUND;
+
+		errno = err_win_to_posix(err);
+		return -1;
+	}
 
 	/*
 	 * No O_APPEND here, because the CRT uses it only to reset the