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tar/asm: adding thoughts on concerns

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Vincent Batts 2015-02-25 16:26:47 -05:00
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tar/asm/README.md
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@ -24,10 +24,19 @@ path would be identical.
Thoughts
--------
While the initial implementation is based on a relative path, I'm thinking the
next step is to have something like a FileGetter interface, of which a path
based getter is just one type.
Have a look-aside directory or storage. This way when a clobbering record is
encountered from the tar stream, then the payload of the prior/existing file is
stored to the CAS. This way the clobbering record's file payload can be
extracted, but we'll have preserved the payload needed to reassemble a precise
tar archive.
Then you could pass a path based Getter and an Unpacker, and receive a
io.Reader that is your tar stream.
clobbered/path/to/file.[0-N]
*alternatively*
We could just _not_ support tar streams that have clobbering file paths.
Appending records to the archive is not incredibly common, and doesn't happen
by default for most implementations. Not supporting them wouldn't be a
security concern either, as if it did occur, we would reassemble an archive
that doesn't validate signature/checksum, so it shouldn't be trusted anyway.