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How the Multi-Arch field and pkg:<arch> dependencies interact was
discussed at DebConf15 in the "MultiArch BoF". dpkg and apt (among other
tools like dose) had a different interpretation in certain scenarios
which we resolved by agreeing on dpkg view – and this commit realizes
this agreement in code.
As was the case so far libapt sticks to the idea of trying to hide
MultiArch as much as possible from individual frontends and instead
translates it to good old SingleArch. There are certainly situations
which can be improved in frontends if they know that MultiArch is upon
them, but these are improvements – not necessary changes needed
to unbreak a frontend.
The implementation idea is simple: If we parse a dependency on foo:amd64
the dependency is formed on a package 'foo:amd64' of arch 'any'. This
package is provided by package 'foo' of arch 'amd64', but not by 'foo'
of arch 'i386'. Both of those foo packages provide each other through
(assuming foo is M-A:foreign) to allow a dependency on 'foo' to be
satisfied by either foo of amd64 or i386. Packages can also declare to
provide 'foo:amd64' which is translated to providing 'foo:amd64:any' as
well.
This indirection over provides was chosen as the alternative would be to
teach dependency resolvers how to deal with architecture specific
dependencies – which violates the design idea of avoiding resolver
changes, especially as architecture-specific dependencies are a
cornercase with quite a few subtil rules. Handling it all over versioned
provides as we already did for M-A in general seems much simpler as it
just works for them.
This switch to :any has actually a "surprising" benefit as well: Even
frontends showing a package name via .Name() [which doesn't show the
architecture] will display the "architecture" for dependencies in which
it was explicitely requested, while we will not show the 'strange' :any
arch in FullName(true) [= pretty-print] either. Before you had to
specialcase these and by default you wouldn't get these details shown.
The only identifiable disadvantage is that this complicates error
reporting and handling. apt-get's ShowBroken has existing problems with
virtual packages [it just shows the name without any reason], so that
has to be worked on eventually. The other case is that detecting if a
package is completely unknown or if it was at least referenced somewhere
needs to acount for this "split" – not that it makes a practical
difference which error is shown… but its one of the improvements
possible.
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We parse all architectures we encounter recently, which means we also
parse packages from architectures which are neither native nor foreign,
but still came onto the system somehow (usually via heavy force).
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Previously we had python:any:amd64, python:any:i386, … in the cache and
the dependencies of an amd64 package would be on python:any:amd64, of an
i386 on python:any:i386 and so on. That seems like a relatively
pointless endeavor given that they will all be provided by the same
packages and therefore also a waste of space.
Git-Dch: Ignore
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Git-Dch: Ignore
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Initializing a random number generator with the time since epoch could
be good enough, but reaches its limits in test code as the 100
iterations might very well happen in the same second and hence the seed
number is always the same… clock() has a way lower resolution so it
changes more often and not unimportant: If many users start the update
at the same time it isn't to unlikely the SRV record will be ordered in
the same second choosing the same for them all, but it seems less likely
that the exact same clock() time has passed for them.
And if I have to touch this, lets change a few other things as well to
make me and/or compilers a bit happier (clang complained about the usage
of a GNU extension in the testcase for example).
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We want to declare some hashes as not enough for security, so that a
user will need --allow-unauthenticated or similar to get data secured
only by those hashes, but we can still us these hashes for integrity
checks if we got them.
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The md5sum hash is broken since some time and we should no longer
consider it a usable hash. Also update the tests to reflect this.
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Various smaller improvements so that the check deals better with already
downloaded files, relative paths and other things.
Git-Dch: Ignore
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Reported-By: gcc
Git-Dch: Ignore
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We had a very similar method previously for our own private usage, but
with some generalisation we can move this check into the acquire system
proper so that all frontends profit from this compatibility change.
As we are disabling a security feature here a warning is issued and
frontends are advised to consider reworking their download logic if
possible.
Note that this is implemented as an all or nothing situation: We can't
just (not) drop privileges for a subset of the files in a fetcher, so in
case you have to download some files with and some without you need to
use two fetchers.
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Using libpam-tmpdir caused us to create our download tmp directory in
root's private tmp before changing to _apt, which wouldn't have access
to it.
By extending our GetTempDir method with an optional wrapper changing the
effective user, we can test if a given user can access the directory and
ignore TMPDIR if not instead of ignoring TMPDIR completely.
Closes: 797270
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Multiple targets downloading the same file is bad™ as it leads us to all
sorts of problems like the acquire system breaking or simply a problem
of which settings to use for them. Beside that this is most likely a
mistake and silently ignoring it doesn't help the user realizing his
mistake…
On the other hand, we have 'duplicates' which are 'created' by how we
create indextargets, so we have to prevent those from being created to
but do not emit a warning for them as this is an implementation detail.
And then, there is the absolute and most likely user mistake: Having the
same target(s) activated in multiple entries.
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xz has pretty much won "the compressor war" and e.g. the Debian archive
doesn't even distribute bz2 anymore in favor of 'xz' and 'gz', so by
changing the default order we have a more realistic --print-uris
behavior as it will always show the first compressor.
In practice this effects repositories without a Release file (very bad,
we don't want to support them anymore anyhow) as xz will be tried before
bz2 now [which is probably not available, but so might be bz2…] AND
repositories which provide both, bz2 and xz (which isn't too common) in
sofar as apt will now download xz instead of bz2.
Users with special needs can stick with bz2 as first compressor tried
with Acquire::CompressionTypes::Order:: "bz2"; (see man apt.conf) – but
users with special needs usually prefer "gz" anyhow, so the realworld
change is expected to be very low.
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Some targets like Contents-udeb are special-needs targets. Shipping the
configuration snippet for them is okay, but they shouldn't be downloaded
by default. Forcing the user to enable targets by uncommenting targets
is wrong and this would still not really solve the problem completely as
even if you want to download some -udebs it will probably not be for all
sources you have enabled, so having the possibility of disabling a
target by default, but giving the user the option to enable it on a
per-source entry basis is better.
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Nobody knows what makes the 'unable to optimize loop' warning to appear
in the sourceslist minus-options parsing, especially if we use a foreach
loop, but we can replace it with some nice c++11 algorithm+lambda usage,
which also helps in making even clearer what happens here.
And as this would be a lonely change, lets do it for a few more loops as
well where I might or might not have seen the warning at some point in
time, too.
Git-Dch: Ignore
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Some additional files like 'Contents' are very big and should therefore
kept compressed on the disk, which apt-file did in the past. It also
implemented pdiff patching of these files by un- and recompressing these
files on-the-fly, with this commit we can do the same – but we can do
this in both pdiff patching styles (client and server merging) and
secured by hashes.
Hashes are in so far slightly complicated as we can't compare the hashes
of the compressed files as we might compress them differently than the
server would (different compressor versions, options, …), so we must
compare the hashes of the uncompressed content.
While this commit has changes in public headers, the classes it changes
are marked as hidden, so nobody can use them directly, which means the
ABI break is internal only.
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Disabling pdiffs can be useful occasionally, like if you have a fast
local mirror where the download doesn't matter, but still want to use it
for non-local mirrors. Also, some users might prefer it to only use it
for very big indextargets like Contents.
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This could allow an attacker to mark a package as installed in a
remote package index, as long as the package was not listed in
the dpkg status file.
This way, an attacker could force the installation of a package
during a dist-upgrade, by providing two packages in an index,
an older marked as installed, and a newer - apt would "upgrade"
to the newer version.
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We dup() the file descriptor when opening compressed files, so we
always need to close the dup()ed one. Furthermore, not unsetting
the d-pointer causes issues when running OpenDescriptor() multiple
times on the same file descriptor.
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By preferring the policy over the depcache, we ignore any changes
we made in the depcache, which makes it impossible for code to
change the candidate used here.
This basically reverts commit 2fbfb111312257fa5fc29b0c2ed386fb712f960e:
prefer the Policy if it is built instead of the DepCache and
if DepCache is not available as fallback built the Policy
But it also cleans the code up a bit, by removing one level
of nesting.
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While Target{,-Add,-Remove} is available for configuring IndexTargets
already, allow Targets to be mentioned explicitely as yes/no options as
well, so that the Target 'Contents' can be disabled via 'Contents: no'
as well as 'Target-Remove: Contents'.
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Sometimes too much refactoring can have bad effects.
Thanks: Niels Thykier for reporting on IRC
Git-Dch: Ignore
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First of, the temporary directory we download the changelog to needs to
be owned by _apt, but that also means that we don't need to check if we
could/should drop privs as the download happens to a dedicated tempdir
and only after that it is moved to its final location by a privileged user.
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Reported-By: codespell
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The parameter name suggests that it should forbid the building of the
entire cache in memory, but this isn't how it was previously and as
AllowMem is false by default it actually prevents previous usecases from
working like being root and configuring apt to build no caches at all.
This should be fixed at some point to actually work, but that is hard to
pull off as it means switching the default and some callers (including
apt itself) actually did call it explicitly with false in certain
cases for no apparent reason (at least now where it is common to have
enough memory to throw at every problem and even if not is a slow apt
usally better than an apt erroring out).
Closes: 796459
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Fetched() was reported for mostly nothing, while we should be calling it
for files worked with from non-local sources (e.g. http, but not file or
xz). Previously this was called from an acquire item, but got moved to
the acquire worker instead to avoid having it (re)implemented in all
items, but the checks were faulty.
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We deal with Conflicts in SmartUnpack in pretty much the same way, but
Breaks weren't handled in SmartConfigure so that the remove was sheduled
after the configuration of the package breaking the to-be-removed.
Closes: 796070
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After fixing Bug#796999, we noticed that there were
some more instances of iterators which had no associated
Dynamic object, causing them to not be updated when
the cache was remapped.
This happened in two places: In NewPackage() and in
NewProvidesAllArch().
Gbp-Dch: ignore
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In both the Ver and Dep variables, we need to account for remapping,
as otherwise we would still reference the old bug.
Reproduction environment:
* An i386 system with amd64 foreign architecture
* A sources.list with
deb http://snapshot.debian.org/archive/debian/20150826T102846Z/ unstable main
deb http://snapshot.debian.org/archive/debian/20150826T102846Z/ experimental main
Thanks: Jakub Wilk for the bug report and the backtraces
Closes: #796999
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Gbp-Dch: ignore
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Also add "Debug::Acquire::SrvRecs" debug option and the option
"Acquire::EnableSrvRecods" to allow disabling this lookup.
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Also support vertical tabs, as isspace() does the same.
Closes: #796067
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feature/srv-records
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Conflicts:
cmdline/apt-helper.cc
cmdline/makefile
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This makes tests work again!
Gbp-Dch: ignore
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Git-Dch: ignore
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Git-Dch: ignore
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It still compiles after the change, so just merge it.
Closes: #448627
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Not all terminals understand DOS' escape sequences for save/restore
cursor, so use the more typical sequences from terminfo.
Closes: #772521
Signed-off-by: James McCoy <jamessan@debian.org>
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Also unify the case of considerFiles and ConsiderFiles to be
ConsiderFiles in all cases.
Gbp-Dch: ignore
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Currently, this always returns true, but it might start returning
false at some point in the future...
Gbp-Dch: ignore
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Gbp-Dch: ignore
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