design
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doc/todo/extensible_addurl.mdwn
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`git annex addurl` supports regular urls, as well as detecting videos that
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quvi can download. We'd like to extend this to support extensible uri
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handling.
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Use cases range from torrent download support, to pulling data
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from scientific data repositories that use their own APIs.
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The basic idea is to have external special remotes (or perhaps built-in
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ones in some cases), which addurl can use to download an object, referred
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to by some uri-like thing. The uri starts with "$downloader:"
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git annex addurl torrent:$foo
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git annex addurl CERN:$bar
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Problem: This requires mapping from the name of the downloader, which is
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probably the same as the git-annex-remote-$downloader program implementing
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the special remote protocol, to the UUID of a remote. That's assuming we
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want location tracking to be able to know that a file is both available
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from CERN and from a torrent, for example.
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It would also be nice to be able to easily configure a regexp that normal
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urls, if they match, are made to use a particular downloader. So, for
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torrents, this would make matching urls have torrent: prefixed to them.
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git config annex.downloader.torrent.regexp '(^magnet:|\.torrent$)'
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It might also be useful to allow bypassing the complexity of the external
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special remote interface, and let a downloader be specified simply by:
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git config annex.downloader.torrent.command 'aria2c %url $file'
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In this case, the UUID used would be the UUID of the web special remote, I
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suppose?
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Some other discussion at <https://github.com/datalad/datalad/issues/10>
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