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

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+ Mon, 10 Aug 2015 05:57:47 -0700 (PDT)\r
+From: Daniel Schoepe <daniel@schoepe.org>\r
+To: David Bremner <david@tethera.net>, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH 4/5] cli: add global option "--uuid"\r
+In-Reply-To: <87r3nbl6p3.fsf@maritornes.cs.unb.ca>\r
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+Date: Mon, 10 Aug 2015 14:57:42 +0200\r
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+On Mon, 10 Aug 2015 13:32 +0200, David Bremner wrote:\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
+Yeah, I think it's reasonable to assume that if the user will delete and\r
+recreate the database, they will also perform the necessary\r
+reinitialization of whatever tool makes use of lastmod / UUID. I guess\r
+this also means that tools often only care about lastmod values and not\r
+the UUID, to allow for compacting without thinking the database is\r
+completely different now.\r
+\r
+Another option is to include lastmod values in the output of\r
+notmuch-dump. Doing that in a clean way might be hard though and I think\r
+this shouldn't be part of this series (which looks fine to me now).\r
+\r
+Best regards,\r
+Daniel\r