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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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These options could be set via configuration before, but the connection
to the actual sources is so strong that they should really be set in the
sources.list instead – especially as this can be done a lot more
specific rather than e.g. disabling Valid-Until for all sources at once.
Valid-Until-* names are chosen instead of the Min/Max-ValidTime as this
seems like a better name and their use in the wild is probably low
enough that this isn't going to confuse anyone if we have to names for
the same thing in different areas.
In the longrun, the config options should be removed, but for now
documentation hinting at the new options is good enough as these are the
kind of options you set once across many systems with different apt
versions, so the new way should work everywhere first before we
deprecate the old way.
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Valid-Until protects us from long-living downgrade attacks, but not all
repositories have it and an attacker could still use older but still
valid files to downgrade us. While this makes it sounds like a security
improvement now, its a bit theoretical at best as an attacker with
capabilities to pull this off could just as well always keep us days
(but in the valid period) behind and always knows which state we have,
as we tell him with the If-Modified-Since header. This is also why this
is 'silently' ignored and treated as an IMSHit rather than screamed at
the user as this can at best be an annoyance for attackers.
An error here would 'regularily' be encountered by users by out-of-sync
mirrors serving a single run (e.g. load balancer) or in two consecutive
runs on the other hand, so it would just help teaching people ignore it.
That said, most of the code churn is caused by enforcing this additional
requirement. Crisscross from InRelease to Release.gpg is e.g. very
unlikely in practice, but if we would ignore it an attacker could
sidestep it this way.
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These functions check the exit code of the command, but for apt commands
we can go further and require an error message for non-zero exits and
none for zero exits.
Git-Dch: Ignore
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For many commands the output isn't stable (like then dpkg is called) but
the exitcode is, so this helper enhances the common && msgpass ||
msgfail by generating automatically a msgtest and showing the output of
the command in case of failure instead of discarding it unconditionally,
the later being chronic-like behaviour
Git-Dch: Ignore
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* doc/apt.conf.5.xml:
- reword Acquire::Max-ValidTime documentation to make clear
that it doesn't provide the new Min-ValidTime functionality
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- fix Acquire::Max-ValidTime option by interpreting it really
as seconds as specified in the manpage and not as days
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