c8f402e43f
the underlying metaphor refers to an inhumane practice, so using it casually is rightfully offensive to many people. it isn't even a particularly apt metaphor, as it suggests a strict hierarchy that is counter to mbsync's highly symmetrical mode of operation. the far/near terminology has been chosen as the replacement, as it is a natural fit for the push/pull terminology. on the downside, due to these not being nouns, a few uses are a bit awkward, and several others had to be amended to include 'side'. also, it's conceptually quite close to remote/local, which matches the typical use case, but is maybe a bit too suggestive of actually non-existing limitations. the new f/n suffixes of the -C/-R/-X options clash with pre-existing options, so direct concatenation of short options is even less practical than before (some suffixes of -D already clashed), but doing that leads to unreadable command lines anyway. as with previous deprecations, all pre-existing command line and config options keep working, but yield a warning. the state files are silently upgraded.
87 lines
3.6 KiB
Text
87 lines
3.6 KiB
Text
f{,data}sync() usage could be optimized by batching the calls.
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make SSL (connect) timeouts produce a bit more than "Unidentified socket error".
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automatically resume upon transient errors, e.g. "connection reset by peer"
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or timeout after some data was already transmitted.
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possibly also try to handle Exchange's "glitches" somehow.
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add support for IMAP UTF-7 (for internationalized mailbox names).
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uidvalidity lock timeout handling would be a good idea.
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should complain when multiple Channels match the same folders.
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propagate folder deletions even when the folders are non-empty.
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- verify that "most" of the folders in the Channel are still there.
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- refuse to delete unpropagated messages when trashing on the remote side.
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- refuse to delete far side if it has unpropagated messages. symmetry?
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add message expiration based on arrival date (message date would be too
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unreliable). MaxAge; probably mutually exclusive to MaxMessages.
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add alternative treatments of expired messages. ExpiredMessageMode: Prune
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(delete messages like now), Keep (just don't sync) and Archive (move to
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separate folder - ArchiveSuffix, default .archive).
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add support for event notification callbacks.
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it would be also possible to report more differentiated exit codes, but
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that seems too limiting in the general case.
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make it possible to have different mailbox names for far and near side in
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Patterns.
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- use far:near for the pattern
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- for quoting, use more colons: the longest sequence of colons is the
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separator
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- this makes Groups mostly useless, as they are mostly a workaround for this
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function being missing so far
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- this is needed for move detection, which would work only within one Channel
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add regexp-based mailbox path rewriting to the drivers. user would provide
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expressions for both directions. every transformation would be immediately
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verified with the inverse transform. PathDelimiter and Flatten would become
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special cases of this.
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add daemon mode. primary goal: keep imap password in memory.
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also: idling mode.
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parallel fetching of multiple mailboxes.
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TLS session resumption becomes interesting then as well.
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imap_set_flags(): group commands for efficiency, don't call back until
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imap_commit().
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add streaming from fetching to storing.
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handle custom flags (keywords).
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make use of IMAP CONDSTORE extension (rfc4551; CHANGEDSINCE FETCH Modifier);
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make use of IMAP QRESYNC extension (rfc5162) to avoid SEARCH to find vanished
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messages.
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use MULTIAPPEND and FETCH with multiple messages.
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create dummies describing MIME structure of messages bigger than MaxSize.
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flagging the dummy would fetch the real message. possibly remove --renew.
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note that all interaction needs to happen on the near side probably.
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don't SELECT boxes unless really needed; in particular not for appending,
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and in write-only mode not before changes are made.
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problem: UIDVALIDITY change detection is delayed, significantly complicating
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matters.
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some error messages are unhelpful in non-verbose mode due to missing context.
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possibly use ^[[1m to highlight error messages.
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consider alternative approach to trashing: instead of the current trash-before-
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expunge done by mbsync, let MUAs do the trashing (as modern ones typically do).
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mbsync wouldn't do any trashing by itself, but should track the moves for
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optimization. additionally, there should be a mode to move trashed messages to
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the remote store. TrashMode Internal|External, AbsorbRemoteTrash.
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a yet different approach to trashing is treating the trash like a normal mailbox.
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however, this implies a huge working set.
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consider optional use of messages-id (and X-GM-MSGID):
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- detection of message moves between folders
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- recovery from loss of sync state, migration from other tools
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