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Fixes lookup in as-installed testing
Gbp-Dch: ignore
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The acquire system mode does this for a long time already and as it is
easy to implement and handy for manual testing as well we can support
it in the other modes, too.
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Merging patches is a bit of non-trivial code we have for client-side
work, but as we support also server-side merging we can export this
functionality so that server software can reuse it.
Note that this just cleans up and makes rred behave a bit more like all
our other binaries by supporting setting configuration at runtime and
supporting --help and --version. If you can make due without this, the
now advertised functionality is provided already in earlier versions.
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If another file in the transaction fails and hence dooms the transaction
we can end in a situation in which a -patched file (= rred writes the
result of the patching to it) remains in the partial/ directory.
The next apt call will perform the rred patching again and write its
result again to the -patched file, but instead of starting with an empty
file as intended it will override the content previously in the file
which has the same result if the new content happens to be longer than
the old content, but if it isn't parts of the old content remain in the
file which will pass verification as the new content written to it
matches the hashes and if the entire transaction passes the file will be
moved the lists/ directory where it might or might not trigger errors
depending on if the old content which remained forms a valid file
together with the new content.
This has no real security implications as no untrusted data is involved:
The old content consists of a base file which passed verification and a
bunch of patches which all passed multiple verifications as well, so the
old content isn't controllable by an attacker and the new one isn't
either (as the new content alone passes verification). So the best an
attacker can do is letting the user run into the same issue as in the
report.
Closes: #831762
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This doesn't allow all tests to run cleanly, but it at least allows to
write tests which could run successfully in such environments.
Git-Dch: Ignore
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The rred parser is very accepting regarding 'invalid' files. Given that
we can't trust the input it might be a bit too relaxed. In any case,
checking for more errors can't hurt given that we support only a very
specific subset of ed commands.
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