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Turns out that pkgDepCache and pkgProblemResolver maintain two (semi)
independent sets of protected flags – except that a package if marked
protected in the pkgProblemResolver is automatically also marked in the
pkgDepCache as protected. This way the pkgProblemResolver will have as
protected only the direct user requests while pkgDepCache will
(hopefully) propagate the flag to unavoidable dependencies of these
requests nowadays. The pkgProblemResolver was only checking his own
protected flag though and based on that calls our Mark* methods usually
without checking return, leading to it believing it could e.g. remove
packages it actually can't remove as pkgDepCache will not allow it as it
is marked as protected there. Teaching it to check for the flag in the
pkgDepCache instead avoids it believing in the wrong things eventually
giving up.
The scoring is keeping the behaviour of adding the large score boost
only for the direct user requests though as there is no telling which
other sideeffects this might have if too many packages get too many
points from the get-go.
Second part of fixing #960705, now with pkgProblemResolver output which
looks more like the whole class of problem is resolved rather than a
teeny tiny edgecase it was before.
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If a package is protected and has a dependency satisfied only by a single
package (or conflicts with a package) this package must be part of the
solution and so we can help later actions not exploring dead ends by
propagating the protected flag to these "pseudo-protected" packages.
An (obscure) bug this can help prevent (to some extend) is shown in
test-apt-never-markauto-sections by not causing irreversible autobit
transfers.
As a sideeffect it seems also to help our crude ShowBroken to display
slightly more helpful messages involving the packages which are actually
in conflict.
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We reseted the candidate for installed packages back to the version
which is installed if one of the (critical) dependencies of it is not
statisfiable, but we can do the same for non-installed packages by
discarding the candidate which beside slightly helping the resolver also
improves error messages generated by apt as a sideeffect.
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With b4450f1dd6bca537e60406b2383ab154a3e1485f we dropped what we
calculated here later on and now that we don't need it in the meantime
either we can just skip the busy work by default and expect dpkg to do
the right thing dropping also our little "last explicit configures"
removal trick introduced in b4450f1dd6bca537e60406b2383ab154a3e1485f.
This enables the last of a bunch of previously experimental options,
some of them existing still, but are very special and hence not really
worth documenting anymore (especially as it would need to be rewritten
now entirely) which is why the documentation is nearly completely
dropped.
The order of configuration stanzas in the simulation code changes
slightly as it isn't concerning itself with finding the 'right' order,
but any order is valid anyhow as long as the entire set happens in the
same call.
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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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Gbp-Dch: ignore
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We use test{success,failure} now all over the place in the framework, so
its only consequencial to do this in the situations in which we test for
a specific output as well.
Git-Dch: Ignore
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Previously, we had a start and a done of the calculation printed by
higher-level code, but this got intermixed by progress reporting from an
external solver or the output of autoremove code…
The higherlevel code is now only responsible for instantiating a
progress object of its choosing (if it wants progress after all) and the
rest will be handled by the upgrade code. Either it is used to show the
progress of the external solver or the internal solver will give some
hints about its overall progress. The later isn't really a proper
progress as it will jump forward after each substep, but that is at
least a bit better than before without any progress indication.
Fixes also the 'strange' non-display of this progress line in -q=1, while
all others are shown, which is reflected by all testcase changes.
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In commit 446551c8 I changed MarkInstall to discard the candidate if the
candidate can't satisfy the dependency. This breaks interactive solvers
like aptitude which can change the candidate on-the-fly later.
In commit df77d8a5 I introduced this 'early' loop-breaking to begin with
which can't be that helpful for interactive solvers as well, but makes
perfect sense for non-interactives to stop them from exploring trees
which can't be satisfied, but it isn't perfect as ideally we would check
this before auto-installing the first dependency.
This commit therefore moves the loop into its own IsInstallOk hook so
that frontends can override this check if they want to and in exchange
removes the loop-breaking from MarkInstall itself and does it before any
dependency is installed.
Closes: 740750
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If a (Pre-)Depends can't be satisfied there is no point in keeping the
candidate as is as it is impossible to find a solution for it, so we can
just as well reset the candidate to the currently installed version.
We avoid trying to install this impossible candidate later on this way.
Closes: #735967
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