Detached signature as a pass-through filter?
mwy-gpg41 at the-youngs.org
Mon Aug 11 23:21:02 CEST 2003
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David Shaw suggested:
> Why not use "tee"? That's the standard resource for constructing a
> pipeline when a command consumes data.
> echo "foo" | tee tempfile | gpg --detach-sign -o sigfile.gpg ; cat tempfile
Using a regular "tempfile", there are two reasons: this requires
storage for the intermediary result (which may be large); and, the
second command doesn't get started until the output is complete. The
same thing can be accomplished without "tee" at all:
echo "foo" > tempfile
gpg ... < tempfile
rm tempfile # need to clean up afterwards, too
I really was looking for a streaming solution.
John Clizbe suggested:
> using tee to split the output stream before you pipe to gpg would be the
> standard way to do it (I'm sure named pipes & file descriptors could be
> woven in some way)
Yes, "tee" combined with a FIFO should work, but it's not very portable.
I could always write my own "tee" that emits to additional file descriptors
(rather than files), and do descriptor redirections. This may be slightly
more portable (e.g., *might* work on Cygwin). Or, I could hack a private
version of GnuPG that does what I want -- that would be portable, but it
adds an upkeep burden (as GnuPG changes, I'd like to follow).
Again, I was just hoping that I could get GnuPG to act as a passthrough.
It seems not. Thanks for the responses, though!
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