Rails - Nov 2007 - How do I know when a file is fully created

Hi,

I have a rails app, that lets user submit data. I use the data to tell
another app to create a file. I can''t get this app to tell me when it
is finished with the file. So is there any way in Rails to check if
another app is writing to a file?


Kind regards,
Dave.
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> I have a rails app, that lets user submit data. I use the data to tell
> another app to create a file. I can''t get this app to tell me when
it
> is finished with the file. So is there any way in Rails to check if
> another app is writing to a file?
There''s probably a way... the unix command lsof will report that sort
of
thing to you, but to check on files you don''t own requires you to be
root.

So maybe not.

I had to do something similar, but for remote web files.  I ended up 
making HEAD requests and comparing the file size over a period of time. 
Once it stopped changing I''d consider the file ready.

You maybe could do something similar.

Or change the process so your second app doesn''t see the file until
it''s
ready.  That is, first app writes out "file.tmp" and at the very end
moves
it to "file" and second app only looks for "file" or
something.

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