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+ Thu, 10 Apr 2014 07:44:12 -0700 (PDT)\r
+Content-Type: text/plain; charset=UTF-8\r
+From: Gaute Hope <eg@gaute.vetsj.com>\r
+To: David Mazieres expires 2014-07-05 CEST\r
+ <mazieres-2vu8n5xbqk4r8zkqh82n4qgci6@temporary-address.scs.stanford.edu>\r
+Subject: Re: [PATCH] Add configurable changed tag to messages that have been\r
+ changed on disk\r
+References: <1396800683-9164-1-git-send-email-eg@gaute.vetsj.com>\r
+ <87wqf2gqig.fsf@ta.scs.stanford.edu>\r
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+Date: Thu, 10 Apr 2014 16:43:03 +0200\r
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+\r
+Excerpts from David Mazieres's message of 2014-04-06 22:19:19 +0200:\r
+> Gaute Hope <eg@gaute.vetsj.com> writes:\r
+>\r
+> > When one of the source files for a message is changed on disk, renamed,\r
+> > deleted or a new source file is added. A configurable changed tag is\r
+> > is added. The tag can be configured under the option 'changed_tags' in\r
+> > the [new] section, the default is none. Tests have been updated to\r
+> > accept the new config option.\r
+> >\r
+> > notmuch-setup now asks for a changed tag after the new tags question.\r
+> >\r
+> > This could be useful for for example 'afew' to detect remote changes in\r
+> > IMAP folders and update the FolderNameFilter to also add tags or remove\r
+> > tags when a _existing_ message has been added to or removed from a\r
+> > maildir.\r
+>\r
+> I think this is the wrong way to achieve such functionality, because\r
+> then the change tag A) is expensive to remove, B) is easy to misuse\r
+> (remember to call fsync everywhere before deleting the change tag), and\r
+> C) can be used by only one application.\r
+>\r
+> A better approach would be to add a new "modtime" xapian value that is\r
+> updated whenever the tags or any other terms (such as XFDIRENTRY) are\r
+> added to or deleted from a docid. If it's a Xapian value, rather than a\r
+> term, then modtime will be queriable just like date, allowing multiple\r
+> applications to query all docids modified since the last time they ran.\r
+>\r
+> [... snip]\r
+\r
+This could also solve it, and probably have more uses. I don't quite see\r
+how the opposite problem (for my use case) can be solved by this without\r
+using a 'localchange' tag. This is to sync tag to maildir sync, when a\r
+new tag has been added (by e.g. a user interaction in a client) it needs\r
+to be copied to the maildir, if it is not done in the same go a\r
+different application won't know whether the change was local or remote.\r
+How did you solve this?\r
+\r
+I would suggest using a Xapian- or Index-time which gets a tick\r
+everytime a modification is made to the index. Atomic operations could\r
+operate on the same time in case this distinction turns out to be\r
+useful. Perhaps something like this already exists in Xapian? This way\r
+clock skew, clock resolution (lots of operations happening in the same\r
+second, msec or nanosec) problems won't be an issue. The crux will be to\r
+make sure all write-operations trigger a tick on the indextime.\r
+\r
+Regards, Gaute\r
projects / notmuch-archives.git / commitdiff