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I didn't wait until September to do it, this year!
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Most spawn and popen_rd callers die on failure to spawn,
anyways, and some are missing checks entirely. This saves
us a bunch of verbose error-checking code in callers.
This also makes popen_rd more consistent, since it already
dies on pipe creation failures.
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The spawn() interface improvements[1] propagate to popen_rd,
too, so we can avoid weird dances to keep the GLOB handle
references live and just pass the handle around.
[1] commit 267371b1273b518215939e817e53733584b68af7
("spawn: allow passing GLOB handles for redirects")
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Hopefully this helps people familiarize themselves with
the source code.
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Using update-copyrights from gnulib
While we're at it, use the SPDX identifier for AGPL-3.0+ to
ease mechanical processing.
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Signals can fire on us at any time if we're using blocking sysread.
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We do not need to import IO::File into the main programs
since Perl 5.8+ supports literal "undef" for generating
anonymous temporary file handles.
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This is necessary for Debian 7.x (wheezy), since
GLOB objects do not seem responsive to the can("fileno")
check (we do a similar check in GitHTTPBackend).
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This should hopefully make it easier to try other anti-spam
systems (or none at all) in the future.
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