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Select latest version of package (if it is not pinned), and print
error if it cannot be installed due to other dependencies.
Together with --available, it selects the latest package which is
present at least in some repository.
This also fixes few solver issues with ordering of package selection
that got quite apparent with this flag. Namely, we cannot "lock"
a package until it's reverse dependencies are locked or not all of
the solver flags are propagated properly.
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Implementing basic dependency handling, install_if and awareness
of pinning.
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apk_name_state is now quite small; and we avoid overhead of two
pointers (+ malloc overhead) when we just make it part of apk_name.
It also fixes some problems (that got introduced) where apk_name_state
was not allocated.
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name state could get overwritten later, so we can't use that when
generating the changeset.
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* solver internally calculates now using tags; not repository masks
* installeddb now contains the tag name where the package came from
-> we can now handle upgrades properly
* the pinning is still a preference, and not strictly enforced;
versioned dependencies may overrule preference
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Previously we would not upgrade just by doing "apk add foo@tag" if
foo was already installed. It required explicit '-u'. This allows
'apk add' to explicitly prefer the newly specified pinning.
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allow per-name solver flags to be inheritable, and use them in
self-upgrade, add -u and the fix applet. this gives more familiar
behaviour for the upgrades.
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the only bit of information needed in solver commit is the "hard"
topology sorting information for trigger ordering. fixes a bug in
"apk del" which uses the state pointers to do intermediate
calculations between solution solving and commit.
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fixes #738
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Deduce the world dependencies to remove locally, and same for the
additional messages about packages not deleted.
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still todo:
- 'fix' is missing
- 'del -R' does not work
- 'upgrade' does not do self-upgrade first
... and a lot of testing.
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* the solver no longer does look-ahead locking of names
(could be possibly optimized later); instead names are now
always ordered strictly to properly detect the package names
which are unsolveable
* basic error tests added, so we can see the most likely problem
in dependencies easily
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* basic code for a backtracking, forward checking dependency satisfier
* works better when there are tricky dependencies to solve
(when can't just upgrade everything to most preferred versions)
* the new code always evaluates all of 'world' constraints
(old code just does incremental updates based on heuristics)
* is probably somewhat slower than old code (probably unnoticeable
difference in most cases)
* makes easier to write support for provides and repository pinning
* test applet and a bunch of test cases added which uses the new code
* from the old feature set install_if is not yet implemented
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