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Dynamically allocate KillList in order to avoid an overflow when
more than 100 elements would be written to it.
This happened while playing around with the status file from
Bug#701069 on a modern system.
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This effectively merges branch 'typofixes-vlajos-20150807' of github.com:vlajos/apt
with the following commit:
commit 13cacb3e2e2352ba701e769fc889e3344fabbf7e
Author: Veres Lajos <vlajos@gmail.com>
Date: Sun Aug 9 00:12:53 2015 +0100
typofix - https://github.com/vlajos/misspell_fixer
It has been rebased for a better commit message.
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Mysteriously segfaults only on i386 for me, but at least one reporter
had the same behavior and it makes sense that this is the problem as the
parsing of Source: was fixed in 1.2.2 – before the not remapped group
was not used.
We don't use our usual Dynamic<> trick here as we don't have it in the
parser. Its a bit of a layer violation to do this parsing here, but its
how it is always was…
Until next time with this lovely kind of problem.
Closes: 812251
Thanks: Francesco Poli and Marc Haber for testdata.
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If an iterator or a stringview has multiple dynamic objects
registered with it, it may be remapped twice. Prevent that
by noting which iterators/views we have seen and not remapping
one if we have already seen it.
We most likely do not have any instance of multiple dynamics
on a single object, but let's play safe - the overhead is not
high.
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If a single pdiff fails, we have to fail the entire patching endeavour
and fall back to getting the complete file instead. That is easy in
serverside merged pdiffs as we get them one by one. For clientside we
get them all at once through, which means that a failure in one has to
stop the entire pipeline, which works as expected (as proven by the
bugreporters as they don't even notice it happening). The problem is
just that the first failing pdiff will do the cleanup, so another pdiff
which happens to be successfully acquired after we processed the failure
doesn't find the file it is supposed to use as a basename anymore, so
the patch is renamed to what should be the unique extension and moved
into the current working directory. Processing is then stopped as the
patch realizes that it isn't the last one which completed downloading.
On the plus side this means this is neither us using a bad temporary
location nor a security problem. It "just" overrides unconditionally
files in your current working directory (if you happen to have them
named like a pdiff patch – a bit unlikely perhaps) and so drops files
there which are never used again.
I guess this was introduced in 4e3c5633b1e74b4f58b95f339cfbbf4cbf21ab3e
for real as I made the need for the existence of the base file rather
explicit, but the potential lingers in the code for far longer.
Closes: #816837
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The liblzma-based write code needs the same tweaks that the read code
already has to cope with the situation where lzma_code returns zero the
first time through because avail_out is zero, but will do more work if
called again.
This ports the read tweaks to the write code as closely as possible
(including matching comments etc.).
Closes: #751688
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Changelogs are relatively small and we have no hashes for them, but we
had partial support for them before, so lets stick to it.
This also deletes the (partial) file before moving the downloaded file
into its place – rename(2) should be doing this by itself, but testing
on semaphoreci suggests that this isn't always the case (error is "Stale
file handle") and we don't need an atomic replace here, so be explicit.
Git-Dch: Ignore
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Reported-By: Helmut Grohne on IRC
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If the architecture list is empty somehow, fail normally.
LP: #1549819
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The EDSP output generated by apt didn't include the versioned provides
information so that every provides looked like an unversioned one in the
eyes of an external resolver.
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pkgAcqChangelog has the default behaviour of downloading a changelog to
a temporary directory (inside /tmp, not /tmp directly), which is cleaned
up on shutdown, but this can be overridden to store the changelog more
permanently – but that caries a permission problem.
For changelog we can 'easily' solve this by always downloading to a
temporary directory and only move it out of there on done.
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If pkgAcqChangelog is told to acquire the changelog for a version it
will check first if this version is installed on the disk and if so will
use the local changelog in /usr/share/doc (possibily/likely gz
compressed) instead of downloading the file from the web.
An option is provided to disable this, which is enabled by default for
the Ubuntu vendor as they truncate the local changelogs – and for apts
--print-uris action.
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Regression introduced in a249b3e6fd798935a02b769149c9791a6fa6ef16, which
in the case of an invalid cache would build the first part unlocked and
later pick up the (still unlocked) cache for further processing, so the
system got never locked and apt would end up complaining about being
unable to release the lock at shutdown.
The far more common case of having a valid cache worked as expected and
hence covered up the problem – especially as tests who would have
noticed it are simulations only, which do not lock.
Closes: 814139
Reported-By: Balint Reczey <balint@balintreczey.hu>
Reported-By: Helmut Grohne <helmut@subdivi.de> on IRC
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If we just reopened the file, we also need to reset the current
seek position when we reset the buffer, otherwise the code will
not try to seek to the position given to Skip (from 0), but will
try to seek to old offset + the position given to skip.
Closes: #812994, #813000
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When writing into the buffer write to free() bytes starting
at getend(), instead of buffersize_max bytes at get()
-> get() is a read pointer.
This makes no difference in practice though, as we reset
the buffer before the call, so start = end = 0.
Gbp-Dch: ignore
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We cannot just return false without setting an error,
as InternalWrite does not set one itself.
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Include <stdlib.h> to ensure that mkdtemp(3) is defined to improve
general portability and fix a specific build failure on Android.
Closes: #807367
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Microoptimization, but still gives a measurable 2-3% improvement
when using commands with lots of output like `apt list`.
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It makes no sense to split a large block into multiple small
blocks, so when we have the chance to write them unbuffered,
do so.
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We do not need the loop, FileFd::Private() handles this for us.
Gbp-Dch: ignore
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We want to check whether the amount of free space is smaller
than the requested write size. Checking maxsize - size() is
incorrect for bufferstart >= 0, as size() = end - start.
Gbp-Dch: ignore
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APT has a different understanding than dpkg (#748936) what matches and
what doesn't match an architecture specification as it isn't converting
back (and forward) to Debian triplets. That has to eventually be solved
some way or the other, but until that happens we change the matching in
apt so that porters can continue their work on non-gnu libc-ports even
if policy doesn't specify that yet (and dpkg just supporting it "by
accident" via triplets).
The initial patch was reformatted, fixed in terms of patterns containing
"any-any", dealing with expanding an arch without libc to gnu while a
pattern expands libc to any, the parsedepends test was fixed (the new
if's were inserted one step too early) and another test just for the
specifications added.
Closes: #812212
Thanks: Bálint Réczey for initial patch
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Git-Dch: Ignore
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The Date field in the Release file is useful to avoid allowing an
attacker to 'downgrade' a user to earlier Release files (and hence to
older states of the archieve with open security bugs). It is also needed
to allow a user to define min/max values for the validation of a Release
file (with or without the Release file providing a Valid-Until field).
APT wasn't formally requiring this field before through and (agrueable
not binding and still incomplete) online documentation declares it
optional (until now), so we downgrade the error to a warning for now to
give repository creators a bit more time to adapt – the bigger ones
should have a Date field for years already, so the effected group should
be small in any case.
It should be noted that earlier apt versions had this as an error
already, but only showed it if a Valid-Until field was present (or the
user tried to used the configuration items for min/max valid-until).
Closes: 809329
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It is a bit academic to support values which aren't big enough to fit even
the hashtables without resizing, but cleaning up ensures that we do the
right thing (aka not segfaulting) even if something goes wrong in these
deep layers. You still can't have very very small values through…
Git-Dch: Ignore
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Part of hidden classes, so conversion is abi-free.
Git-Dch: Ignore
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These virtual methods are implemented in hidden classes, so we can drop
them without breaking the ABI.
Git-Dch: Ignore
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In commit a221efc331693f8905da870141756c892911c433 I promoted the source
package name and version to the binary cache for faster access by e.g.
EDSP, but due to changing the interpretation length to soon we always
ignored the version part of the Source field, so that packages ended up
having the binary version as source version – which while usually just
fine it is wrong for binary rebuilds.
Closes: 812492
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Reported-By: cppcheck
Git-Dch: Ignore
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gcc correctly reports that we check for the same value twice, expect
that the manpage of read(2) tells us to do it for portability, so to
make both sides happy lets add a little #if'ing here.
Reported-By: gcc-6
Git-Dch: Ignore
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This would mess up reference counting and should not be allowed
(it could be implemented correctly, but it would not be efficient
and we do not need it).
Gbp-Dch: ignore
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build-dep was implemented by parsing the build-dependencies of a package
and figuring out which packages to install/remove based on this. That
means that for the first level of dependencies build-dep was
implementing its very own resolver with all the benefits (aka: bugs)
this gives us for not using the existing resolver for all levels.
Making this work involves generating a dummy binary package with fitting
Depends and Conflicts and as we can't create them out of thin air the
cache generation needs to be involved so we end up writing a Packages
file which we want to parse – after we have parsed the other Packages
files already. With .dsc/.deb files we could add them before we started
parsing anything.
With a bit of care we can avoid generating too much data we have to
throw away again (as many parts assume that e.g. the count of packages
doesn't change midair), so that on a speed front there shouldn't be
much of a difference, but output can be slightly confusing as if we have
a completely valid cache on disk the "Reading package lists... Done" is
printed two times – but apt is pretty quick about it in that case.
Closes: #137560, #444930, #489911, #583914, #728317, #812173
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Proper debian packages do not contain ':' in the package name, so for
real packages this is a non-issue, but apt itself frequently makes use
of packages with such an illegal name for internal proposes.
Git-Dch: Ignore
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If you have chosen to install a foreign architecture provider it is
more reasonable to keep this provider instead of removing this one to
replace it with a newer version from a (usually) more preferred arch.
Git-Dch: Ignore
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Git-Dch: Ignore
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To resolve dependencies like "pkg:arch" we create a package with the
name "pkg:arch" and the architecture "any". We create these packages
only if a dependency needs it as these kind of dependencies aren't that
common. This commit ensured that in the even this architecture specific
dependency is the only relation this package has we still create the
underlying package to have them available in provides resolution.
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Git-Dch: ignore
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Git-Dch: ignore
Thanks: David Kalnischkies
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Thanks: Thomas Reusch
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I only looked at parameters in the previous commit, which was
not enough: One place also generated local string views. In this
case, we only need to make ArchA dynamic, as NameA is not used
after the FindPkg() call.
Gbp-Dch: ignore
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It turns out that StringViews might need to be remapped in some
places because they come from the cache. For example, some sites
pass a Ver.VerStr() to NewProvides().
Such a StringView would become invalid during the duration of
the call if the cache is remapped, causing the program to die
with a segmentation fault.
We can take care of those issues by remapping string views in
the same way we remap all the iterators. String views are only
remapped if they point into the cache though, this allows us
to write more generic code on the callee site without having
to check whether the view points into the cache or not.
That's not as efficient as possible, but the overhead does not
appear to be measurable.
Closes: #812251
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This allows us to check if a value to be remapped was inside
the cache or not, which will become useful at a later point.
Gbp-Dch: ignore
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APT::StringView is supposed to be a temporary measure, until support
for the standardized string_view is widely available. Introducing
additional unstandardized features just makes porting to the
standard version harder.
The constexpr constructor also won't have any real effect on most
systems, as the compiler will happily optimise the strlen() call
away for constant strings.
Gbp-Dch: ignore
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Git-Dch: Ignore
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The commit also adds a few trivial tests
Git-Dch: Ignore
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The position returned is supposed to be the position of the character
counted from the start of the string, but if we used the substr calling
overloads the skipped over prefix wasn't considered. The pos parameter
of rfind had also the wrong semantic.
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Introduced in 9d2a8a7388cf3b0bbbe92f6b0b30a533e1167f40 apt tries to
merge actions like downloading the same (as judged by hashes) file
into doing it once. The implementation was very simple in that it isn't
planing at all. Turns out that it works 90% of the time just fine, but
has issues in more complicated situations in which items can be in
different stages downloading different files emitting potentially the
"wrong" hash – like while pdiffs are worked on we might end up copying
the patch instead of the result file giving us very strange errors in
return. Reverting the change until we can implement a better planing
solution seems to be the best course of action even if its sad.
Closes: 810046
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Architectures for packages which do not belong to the native nor a
foreign architecture (dubbed barbarian for now) which are marked
M-A:foreign still provide in their own architecture even if not for
others. Also, other M-A:foreign (and allowed) packages provide in these
barbarian architectures.
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