Re: [notmuch] Mail in git

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+From: Stewart Smith <stewart@flamingspork.com>\r
+To: martin f krafft <madduck@madduck.net>, notmuch@notmuchmail.org\r
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+Date: Thu, 18 Feb 2010 10:56:53 +1100\r
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+Subject: Re: [notmuch] Mail in git\r
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+\r
+On Wed, 17 Feb 2010 14:21:01 +1300, martin f krafft <madduck@madduck.net> w=\r
+rote:\r
+> What I am wondering is if (explicit) tags couldn't be represented as\r
+> tree-objects with this.\r
+>=20\r
+>   evenless-link   =E2=80=94 link a message object with a tree object\r
+>   evenless=E2=80=93unlink =E2=80=93 unlink a message object from tree obj=\r
+ect\r
+>     [replaces evenless-unlink]\r
+\r
+I think it could get expensive for tags with lots of messages.\r
+\r
+With my fast-import script, doing the commit (that\r
+referenced... umm.. 800,000+ objects took a *very* long time).\r
+\r
+As far as I understand it, the tree object is stored in full and space\r
+is only reclaimed during repack (due to delta compression).\r
+\r
+So if you, say, had the entire history of a high volume list such as\r
+linux-kernel, adding messages could get rather expensive if you\r
+auto-tagged (or autotagged messages with patches or whatever).\r
+\r
+> messages would then be deleted whenever using git-gc.\r
+>=20\r
+> No idea how this would sync if we don't keep ancestry. Otoh, it\r
+> would probably not be very expensive to do just that.\r
+\r
+If we keep ancestry though, we are reusing existing working code for\r
+backup (git-pull :)\r
+\r
+Keep in mind that with my tests, the Maildir in git is about a quarter\r
+to a fifth of the size of it in Maildir... so a bit of extra usage per\r
+message isn't as dramatic as it may sound.\r
+\r
+> Is it possible to find out all trees that reference a given object\r
+> with Git in constant or sub-linear time?\r
+\r
+I don't think so.... but I'm not sure.\r
+\r
+--=20\r
+Stewart Smith\r