[MERGE] Give nicer errors for some write operations on read-only transports.

[Robert Collins]

On Mon, 2007-09-03 at 05:30 -0400, Martin Pool wrote:
...
> Aside from that it looks good, thanks!

I have a small problem here - this looks like a case of 'look before you
leap.'.

Why is this function needed at all - why not try the operation and have
the error be printable/be caught ?

-Rob
-- 
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