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And improve reliability while we're at it. It seems closing a
TCP listen socket on FreeBSD 12.2 doesn't cause connect()-ing
clients to fail. This happens regardless of whether a socket is
IPv4 or IPv6
This non-failure was causing tests to timeout slowly on the
client side instead of failing immediately. We now fork a new
process which does nothing but accept() + shutdown() to emulate
a dead server.
Reliability improves on all OSes since there's never a point in
time when another process can bind the socket.
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We can't assume -imapd will be ready by the time we try to
connect to it after restart when using "-l $ADDR". So recreate
the (closed-for-testing) listen socket in the parent and hand it
off to -imapd as we do normally
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Like with Maildir, IMAP folders can be deleted entirely.
Ensure they can be eliminated, but don't be fooled into
removing them if they're temporarily unreachable.
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There's no point in keeping mail_sync.sqlite3 entries around
if the folder is gone. We do keep saved-search configs around,
however, since somebody may decide to blow away a search and
start over.
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Merely pruning mail synchronization information was
insufficient for Maildir: renames are common in Maildir
and we need to detect them after-the-fact when lei-daemon
isn't running.
Running this command could make "lei index" far more
useful...
v2: close R/O mail_sync.sqlite3 dbh before fork
Keeping the DB file handle open across fork can cause bad things
to happen even if we don't use it since sqlite3 itself still knows
about it (but doesn't know Perl code doesn't know about it).
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