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I didn't wait until September to do it, this year!
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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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This should be more reliable and safer as it'll ensure
existing fast-import instances are shut down properly.
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We need to ensure new messages are being processed
fairly during full rescans, so have the ->scan subroutine
yield and reschedule itself. Additionally, having a
long-running task inside the signal handler is dangerous
and subject to reentrancy bugs.
Due to the limitations of the Filesys::Notify::Simple interface,
we cannot rely on multiplexing I/O interfaces (select, IO::Poll,
Danga::Socket, etc...) for this. Forking a separate process
was considered, but it is more expensive for a mostly-idle
process.
So, we use a variant of the "self-pipe trick" via inotify (or
whatever Filesys::Notify::Simple gives us). Instead of writing
to our own pipe, we write to a file in our own temporary
directory watched by Filesys::Notify::Simple to trigger events
in signal handlers.
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Otherwise the old watcher may run indefinitely
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This can be useful for adding new lists, as restarting is
expensive (but still non-lossy).
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This will allow users to run importers off existing mail
accounts where they may not have access to run -mda.
Currently, we only support Maildirs, but IMAP ought to be
doable.
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