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Original commit message:
Out of memory and similar circumstanzas could cause MMap::Map to fail
and especially the mmap/malloc calls in it. With some additional
checking we can avoid segfaults and similar in such situations – at
least in theory as if this is a real out of memory everything we do to
handle the error could just as well run into a memory problem as well…
But at least in theory (if MMap::Map is made to fail always) we can deal
with it so good that a user actually never sees a failure (as the cache
it tries to load with it fails and is discarded, so that DynamicMMap
takes over and a new one is build) instead of segfaulting.
Closes: 803417
LP: #1815129
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In #737085 we see that apt can be confused if informations about
versions only differ slightly. This commit adds a way of at least adding
a few more data points with the next abi break to help a bit with it.
Git-Dch: Ignore
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Beside being a bit cleaner it hopefully also resolves oddball problems
I have with high levels of parallel jobs.
Git-Dch: Ignore
Reported-By: iwyu (include-what-you-use)
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Reported-By: gcc -Wunused-parameter
Git-Dch: Ignore
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[-Wunsafe-loop-optimizations]
Git-Dch: Ignore
Reported-By: gcc -Wunsafe-loop-optimizations
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Git-Dch: Ignore
Reported-By: gcc -Wcast-qual
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do not blindly assume that all packages stanzas have a "Description:"
field in 'apt-cache show' as well as in the cache creation itself.
We instead assume now that if the stanza has a Description, it will not
be the first field as we look out for "\nDescription" to take care of
MD5sum as well as (maybe ignored) translated Descriptions embedded in
the package stanza.
Closes: #712435
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to save some space and allow quick comparisions later on
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* apt-pkg/pkgcache.cc:
- assume sorted hashtable entries for groups/packages
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so use this to try to reuse some version strings
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version strings e.g. for implicit multi-arch dependencies
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- do not store the MD5Sum for every description language variant as
it will be the same for all so it can be shared to save cache space
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- Fix crash if the cache is remapped while writing a Provides version
(LP: #1066445).
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as it is used for arch:all packages as a map to arch:native.
Otherwise arch comparisons later will see differences (Closes: #689323)
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handled in NewVersion is already registered
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we use the not remapped iterators after a move of the mmap again
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- ensure that dependencies for packages:none are always generated
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- do not create 'native' (or now 'none') package structures as a side
effect of description translation parsing as it pollutes the cache
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by introducing a pseudo-architecture 'none' so that the small group of
users with these packages can get right of them without introducing too
much hassle for other users (Closes: #686346)
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- always reset _error->StackCount in MakeStatusCache (Closes: #677175)
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- make IsDuplicatedDescription static so that it is really private
as we don't need a symbol for it as it is not in a header
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we end up working on dangling pointers otherwise which segfaults on
s390x and ppc64 (Closes: #669427)
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- check if NewDescription allocation has failed and error out accordingly
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(and be it if it tries to announce that…)
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struct is created and not at the end of the cache generation
This allows us to be independent from the configured architectures for
these kind of conflicts, we get natural progress for free and
only the needed dependencies are in th respective binary cache.
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just with different debugging information at the end
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the merging with this knowledge a bit and by correctly sharing the lists
we only need to have a single description list for possibly many different
versions. This also means that description translations are shared between
different sources
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- refactor MergeList by creating -Group, -Package and -Version specialist
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done on the mirco-optimazation level, so lets fix them:
(performance) Possible inefficient checking for emptiness.
(performance) Prefer prefix ++/-- operators for non-primitive types.
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- use ref-to-ptr semantic in NewDepends() to ensure that the
libapt does not segfault if the cache is remapped in between
(LP: #812862)
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- add GetModificationTime() helper
* apt-pkg/pkgcachegen.cc:
- regenerate the cache if the sources.list changes to ensure
that changes in the ordering there will be honored by apt
* apt-pkg/sourcelist.{cc,h}:
- add pkgSourceList::GetLastModifiedTime() helper
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- fallback to memory if file is not writeable even if access()
told us the opposite before (e.g. in fakeroot 1.16) (Closes: #630591)
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use the internal resolver can now be used also with external
ones as the usage is hidden in between the old API
* provide two edsp solvers in apt-utils:
- 'dump' to quickly output a complete scenario and
- 'apt' to use the internal as an external resolver
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