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

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+ Mon, 10 Aug 2015 02:40:25 -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: <1439112285-6681-5-git-send-email-david@tethera.net>\r
+References: <1439112285-6681-1-git-send-email-david@tethera.net>\r
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+Date: Mon, 10 Aug 2015 11:40:21 +0200\r
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+\r
+On Sun, 09 Aug 2015 11:24+0200, David Bremner wrote:\r
+> +    ``--uuid=HEX``\r
+> +       Enforce that the database UUID (a unique identifier which\r
+> +       persists until e.g. the database is compacted)\r
+> +       is HEX; exit with an error if it is not. This is useful to\r
+> +       detect rollover in modification counts on messages. You can\r
+> +       find this UUID in the first column of output from\r
+> +       ``notmuch count --output=modifications``\r
+\r
+I think it's not entirely clear what the connection between the UUID and\r
+the revisions on messages is. For example, compacting a database\r
+shouldn't make a difference "extensionally", so the naive assumption\r
+might be that the UUID, or, maybe more importantly, the revision counts\r
+don't change.\r
+\r
+For example, if lastmod queries are used to incrementally back up or\r
+synchronize tags, then it doesn't matter if the database got compacted,\r
+all one cares about are the changes to messages' tags since an earlier\r
+point.\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
+Best regards,\r
+Daniel\r