Re: [PATCH 4/5] cli: add global option "--uuid"

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+From: David Bremner <david@tethera.net>\r
+To: Daniel Schoepe <daniel@schoepe.org>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH 4/5] cli: add global option "--uuid"\r
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+Date: Mon, 10 Aug 2015 13:32:40 +0200\r
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+Daniel Schoepe <daniel@schoepe.org> writes:\r
+\r
+> Based on quick experiments, it seems that the revisions don't change\r
+> when compacting the database; is this something that the patches\r
+> guarantee or a coincidence?\r
+\r
+Now that you mention it, I can see that despite essentially quoting the\r
+xapian docs, compacting might not be the best example.\r
+\r
+According to the xapian docs:\r
+\r
+   The UUID will persist for the lifetime of the database.\r
+\r
+    Replicas (eg, made with the replication protocol, or by copying all\r
+    the database files) will have the same UUID. However, copies (made\r
+    with copydatabase, or xapian-compact) will have different UUIDs.\r
+\r
+So compacting is in fact a bit of a strange case, it preserves the\r
+lastmod counters (because those are just terms on documents), but not\r
+the uuid. This means from notmuch point of view have no programmatic way\r
+to know that we can trust the lastmod data, i.e. no way to distinguish a\r
+previous notmuch-compact from "notmuch dump && rm the database &&\r
+notmuch new && notmuch restore".  On the other hand, I _think_ we could\r
+promise the user that lastmod data is preserved by compacting; they\r
+would just have to tell whatever external tool to ignore uuid errors and\r
+perhaps set the new uuid.\r
+\r
+d\r