There is no reason why the hint documentation is not in the britney
code base (particularly, as we would be more likely to update it when
we add new hints).
Signed-off-by: Niels Thykier <niels@thykier.net>
When I rewrote the compute_scc function into an iterative variant, I
almost included a bug that could make it come up with components that
were not strongly-connected.
Signed-off-by: Niels Thykier <niels@thykier.net>
Rewrite _compute_scc to be iterative to avoid call recursion limit for
graphs with long dependency chains.
Signed-off-by: Niels Thykier <niels@thykier.net>
Sometimes the solver would correctly compute which items are grouped
together, but then fail to emit some groups. This is trivially
fixable by forcing an update of "before" + "after" relations.
Admittedly, this looks unnecessary, so it may just be hiding the bug.
Nonetheless, the change makes the new test_solver_simple_scc test
produce the expected result.
Signed-off-by: Niels Thykier <niels@thykier.net>
devscripts' grep-excuses expects each <li> to be on its own line. When
d7a676d074 added the verdict summary,
without an EOL, it broke grep-excuses' ability to search by maintainer.
Signed-off-by: James McCoy <jamessan@debian.org>
Signed-off-by: Niels Thykier <niels@thykier.net>
With this change, Britney can now provide a very brief summary of the
migration via one single value (YAML) or line (HTML). This solves two
issues:
* It provides an aggregated version of the policy decision without
having to loop over all policies (and even those would not give
a full verdict on their own as not all rejections come from
policies)
* It enables a simple way to inform readers of the HTML excuses of
whether a rejection is permanent or not. This should hopefully
make it easier for contributors to understand Britney and react
more pro-actively.
Signed-off-by: Niels Thykier <niels@thykier.net>
In the unlike case that there are multiple removal hints, showing
the first valid hint should be sufficient.
Signed-off-by: Niels Thykier <niels@thykier.net>
Britney has a special case for essential packages to ensure that any
package that with essential packages are not installable. This check
did not account for a case, where a package is not co-installable with
two or more pseudo-essential package part of the same OR dependency.
A contrived example based on real world data:
Package: foo
# Conflict with all providers of "awk"
Conflicts: mawk | gawk | original-awk
This alone is actually not sufficient to trigger the bug, as
_get_min_pseudo_ess_set is in theory some times smart enough to pick
an "obvious" solution between the pseudo-essential option.
When it does, one of the above ends up in the (de-facto) essential set
and then the installability tester correctly rejects "foo".
Though, even with the fix above, the handling for this is probably not
correct if the essential set is not (fully co-)installable. However,
that basically only happens if we are bootstrapping an architecture
(or testing is royally broken, in which case this is the least of our
worries).
Signed-off-by: Niels Thykier <niels@thykier.net>
Doing this means that you can't use the hint tester for packages with
uppercase characters in the version, e.g.
Version mismatch, dreamchess 0.2.1-rc2-2build1 != 0.2.1-RC2-2build1
Closes: Debian#846141
Signed-off-by: Niels Thykier <niels@thykier.net>
This fixes commit 497edc to really allow policies to see if the excuse has
already been invalidated by previous policies.
Signed-off-by: Niels Thykier <niels@thykier.net>
Niels Thykier
Jonathan Wiltshire
Ivo De Decker
Raphaël Hertzog
James McCoy
Julien Cristau
Iain Lane
Emilio Pozuelo Monfort
Robert Bruce Park