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As with LeiToMail, we'll exclusively rely on O_EXCL and EEXIST
instead of "-f" (stat(2)) for file name collision checking.
Furthermore, we can rely on link(2) error handling instead of
using stat(2) to check the result of link(2).
We'll still keep the hostname in these filenames, but memoize it
on a per-instance basis since hostname changes are rare and we
can assume it won't change between "tmp" and "cur".
We'll also start embedding the PID as {"tmp.$$"} into the fiel
name to guard against accidental deletion in child processes,
instead of requiring an extra hash lookup.
Finally, avoid multiple getpid(2) syscalls in internal subs
since glibc no longer caches in getpid(3).
We'll also favor constant comparison of $! against EEXIST for
inlining. and stop doing ->autoflush when we only have a single
print + flush.
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Using "make update-copyrights" after setting GNULIB_PATH in my
config.mak
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It's possible for ~/.public-inbox/ to not exist if PI_CONFIG
points to an alternate location. Only noticed from the previous
patch fixing t/init.t behavior.
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I didn't wait until September to do it, this year!
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There's a bunch of leftover "require" and "use" statements we no
longer need and can get rid of, along with some excessive
imports via "use".
IO::Handle usage isn't always obvious, so add comments
describing why a package loads it. Along the same lines,
document the tmpdir support as the reason we depend on
File::Temp 0.19, even though every Perl 5.10.1+ user has it.
While we're at it, favor "use" over "require", since it it gives
us extra compile-time checking.
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I mainly focus on -watch for mirroring busy mailing lists, but
using -mda should remain an option.
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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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Be more explicit and slightly speed up tests.
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This is transactional and hopefully safer in case we hit SIGSEGV
or SIGKILL during processing, as the tmp/ copy will remain on
the FS even if DESTROY/END handlers are not called.
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