From: Andrew Stewart <boss@...>
Date: 2006-11-09T03:16:39+09:00
Subject: Re: Net::SSH Data Stream Problem


On 8 Nov 2006, at 17:56, Hugh Sasse wrote:

> OK, given they're both unices, that figures...  I'd then read and
> write in smaller chunks.  I don't do enough deep networking to know
> what packet sizes are sensible, but...
>
> ---------------------------------------------------------------  
> IO#write
>      ios.write(string)    => integer
> ---------------------------------------------------------------------- 
> --
>      Writes the given string to _ios_. The stream must be opened for
>      writing. If the argument is not a string, it will be converted  
> to a
>      string using +to_s+. Returns the number of bytes written.
>         [...]
>
> ...probably a good idea to check the return value.  And for f.read.

I changed this:

     open(source_path) { |f| stdin.write f.read }

To this:

     open(source_path) { |f|
       x = f.read
       puts "x: #{x.length}"
       result = stdin.write x
       puts "result: #{result}"
     }

And it told me that x is the size of my file, so f.read is reading in  
the entire file.

The stdin object is an instance of SSHStdinPipe.  The documentation  
for its write method [1] says: "Write the given data as channel data  
to the underlying channel."  I.e. it doesn't mention anything about  
size limits.

But clearly there is a size limit somewhere and the 'stdin.write  
data' method must be the line which hits it.  I dug into the source  
but got a bit confused.

Any more ideas?

Thanks,
Andy

[1] http://net-ssh.rubyforge.org/api/classes/Net/SSH/Service/Process/ 
POpen3Manager/SSHStdinPipe.html