Re: Raku IO IceDrive bug

On 10/16/23 06:54, Ralph Mellor wrote:
>> if not FileExists( $WanIpFileName )  {
>>      $WanIpFileName.IO.open(:w);
>>      spurt "$WanIpFileName", "New File Opened";
>> }
> 
> Afaik, depending on how you choose to look at things,
> there's a doc error (doc for `spurt` doesn't mention that
> it opens the file it's spurting to), and/or behavior due to
> your Windows file system / account settings that leads
> to the issue you see, and/or a bug in your code.
> 
> Let me explain. Here's what the code does:
> 
> 1. Opens the file with `$WanIpFileName.IO.open(:w);`
> if it doesn't already exist.
> 
> 2. Opens the file with `spurt` and writes to it.
> 
> And that causes the behavior you see.
> 
> Presumably, on your system/setup, doing those two things
> fails because the second open fails due to the first one.
> 
> So it succeeds the second time around because the file
> already exists (though blank) and the `spurt` goes ahead.
> 
> I'd argue that the bug is ultimately in your code, perhaps
> due to you not realizing that `spurt` opens the file it spurts
> to, because the doc doesn't say so.
> 
> Whichever way one looks at it, there's no bug in Raku(do).
> 
> --
> love, raiph


Hi Raiph,

Interesting.  Be nice if it was me.  I can fix me.
I can't fix bugs in languages.

Looking at
     https://docs.raku.org/type/IO::Path

I only find one instance of IO.open and it is an
example for "unlink"

     'foo.txt'.IO.open(:w).close;

I was using it to create a file.  I can not find
any discussion of that.

And I could find no discussion of file locks either.

     spurt "$WanIpFileName", "New File Opened";

was only added to see it I could write to the newly
created file.  Apparently, not.  And no error message
complaining about being denied access (file lock?).

Maybe I am opening a handle that is blocking
spurt from writing to the file.  It should not
matter, but apparently is does.

And if the above is the case, it is a bug in Raku.

Maybe I should have done
     $WanIpFileName.IO.open(:w).close;


What I need is what function Raku is using to support fileapi.h:
     CreateFileA function (fileapi.h)
 
https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-createfilea

And I see that fileapi.h is also opening a handle
which probably should also be closed.

I really do not feel like writing the api call myself.

Thank you for the help,
-T

p.s.  I adore Linux's "touch" command.