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+Message-ID: <4E09072A.7040906@fifthhorseman.net>\r
+Date: Mon, 27 Jun 2011 18:41:46 -0400\r
+From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
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+To: Notmuch Mail <notmuch@notmuchmail.org>\r
+Subject: interaction between --format=raw and multipart handling [was: Re:\r
+ Do not attept to output part raw if part is not GMimePart.]\r
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+On 06/27/2011 06:07 PM, Austin Clements wrote:\r
+> Oh, right, of course. show_message_part will walk into the parts, so\r
+> format_part_content_raw will still be called on the leafs of a\r
+> requested multipart. Though, this approach results in each leaf being\r
+> transfer decoded and printed individually, so if you ask for a\r
+> multipart, you won't get the "raw" contents of the multipart (unless\r
+> it's part 0), so much as you get the concatenated "raw" contents of\r
+> each part in the multipart.\r
+\r
+\r
+let's take two labeled examples:\r
+\r
+A=E2=94=94=E2=94=AC=E2=95=B4multipart/signed 58292 bytes\r
+B =E2=94=9C=E2=94=AC=E2=95=B4multipart/mixed 56553 bytes\r
+C =E2=94=82=E2=94=9C=E2=95=B4text/plain 1278 bytes\r
+D =E2=94=82=E2=94=9C=E2=95=B4text/plain attachment [grub-install.out] 541=\r
+09 bytes\r
+E =E2=94=82=E2=94=94=E2=95=B4text/x-diff attachment [597538.patch] 496 by=\r
+tes\r
+F =E2=94=94=E2=95=B4application/pgp-signature attachment [signature.asc] =\r
+900 bytes\r
+\r
+\r
+X=E2=94=94=E2=94=AC=E2=95=B4multipart/signed 3863 bytes\r
+Y =E2=94=9C=E2=95=B4text/plain 1857 bytes\r
+Z =E2=94=94=E2=95=B4application/pgp-signature attachment [signature.asc] =\r
+900 bytes\r
+\r
+(i know, you won't use "A" or "Z" as part IDs once we have hierarchical\r
+part numbers, but consider them placeholders).\r
+\r
+if parts F or Z are ever going to be useful (e.g. to some external\r
+process that wants to validate the signature by hand), then the tool\r
+needs to provide some way of producing parts B and Y in a pristine form\r
+(that is, including MIME headers and without interpreting/applying any\r
+transfer encodings).\r
+\r
+Perhaps this means there are two flavors of "raw" that we should be\r
+distinguishing, something like:\r
+\r
+ 0) "source" -- the equivalent to viewing the source of the message,\r
+with headers and without attempting to reverse transfer-encodings, etc.\r
+\r
+ 1) "rare" -- (not entirely raw, but still bloody, ha ha) strip headers,\r
+reverse transfer encodings, etc.\r
+\r
+I think our current implementation of --format=3Draw emits "source" when\r
+applied to the entire message, but "rare" when applied to one of the part=\r
+s.\r
+\r
+I'm suggesting that it might be useful to be able to get "source" of a\r
+part. (and perhaps it might also be useful to get the whole message\r
+"rare" sometimes?)\r
+\r
+My first instinct was: if it's multipart, provide "source", if it's\r
+single-part, provide "rare". But that fails for the XYZ case above --\r
+we'd need Y (which is single-part) to be provided as "source" if we were\r
+ever to be able to make use of Z on its own, so i don't think it'll be\r
+that simple.\r
+\r
+OTOH, i'm not sure that "rare" is particularly meaningful for non-leaf\r
+parts.\r
+\r
+> Daniel, is this the problem that you're getting at with "opacity"?\r
+\r
+the origin of the term "opaque" used in this context can be found in the\r
+definition of multipart/signed:\r
+\r
+ https://tools.ietf.org/html/rfc1847#section-2.1\r
+\r
+> That if you ask for a multipart, you should effectively get a slice\r
+> out of the original message bytes (since multipart/* parts can't have\r
+> non-identity transfer encodings). Are you also saying that should\r
+> extend to transfer encoded leaf parts, too?\r
+\r
+hmm. is it true that multipart/* parts can't have non-identity transfer\r
+encodings? that would simplify some things, but i don't have a\r
+reference handy that says it's the case.\r
+\r
+At any rate, i'm not sure it affects the need for being able to emit\r
+both "rare" and "source" forms of at least the leaf (non-multipart) parts=\r
+=2E\r
+\r
+i hope this is all at least somewhat clarifying and not just adding to\r
+the confusion,\r
+\r
+ --dkg\r
+\r
+\r
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projects / notmuch-archives.git / commitdiff