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From: | Elvis Stansvik |
Subject: | Re: [Duplicity-talk] Question about the TAR replacement format |
Date: | Mon, 9 Jun 2014 23:16:49 +0200 |
Hi all,I got interested in the archive format described at [1].Is there still an interest in developing this format further and eventually replacing the use of TAR in Duplicity?I have no particular experience with archive formats, but I have a couple of questions (some of which may be dumb):* Is the inner index file (the one containing repeated metadata) supposed to come after the inner data file? I've attached a full diagram of the format to show the order of things. Is it correct?* Why the division into such small (<= 65k) blocks at the outer level? Why not let each block at the outer level contain an entire inner data/index pair?
* The notes says: "Archive footer: Must contain all information in the header, in case the header is lost.". When would the header get lost?* Would it not be useful to have some blocks compressed and some not (those corresponding to already compressed files)?I saw in the archives that a few years ago someone suggested maybe using XAR [2], but got no response. Could that be an alternative or is there something missing that Duplicity would need? The XAR format seems quite badly documented though..Best regards,Elvis Stansvik
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