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This makes things much easier to use
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Our error reporting is historically grown into some kind of mess.
A while ago I implemented stacking for the global error which is used in
this commit now to wrap calls to functions which do not report (all)
errors via return, so that only failures in those calls cause a failure
to propergate down the chain rather than failing if anything
(potentially totally unrelated) has failed at some point in the past.
This way we can avoid stopping the entire acquire process just because a
single source produced an error for example. It also means that after
the acquire process the cache is generated – even if the acquire
process had failures – as we still have the old good data around we can and
should generate a cache for (again).
There are probably more instances of this hiding, but all these looked
like the easiest to work with and fix with reasonable (aka net-positive)
effects.
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In private-install.cc we call MarkInstall with FromUser=true, which sets
the bit accordingly, but while applying the EDSP solution we call mark
install on all packages with FromUser=false, so MarkInstall believes
this install is an automatic one and sets it to auto – so that a new package
which is explicitely installed via an external solver is marked as auto
and is hence also up for garbage collection in a following call.
Ideally MarkInstall wouldn't reset it, but the detection is hard to do
without regressing in other cases – and ideally ideally MarkInstall
wouldn't deal with the autobit at all – so we work around this on the
calling side for now.
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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 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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This ensures that we can install .deb files that are not the
candidate for a given package.
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Thanks: Steve Slangasek for the suggestion
Closes: 695633
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This makes tests work again!
Gbp-Dch: ignore
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For a non-installed package, manual_installed was set to the null
pointer. This was passed to Tag::Rewrite, which expects an string
(empty for null-type values) and the conversion from null pointer
to string does not work correctly.
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This breaks the translation for no big gain, but we broke enough strings
already for that to not really matter anymore.
Closes: #82430
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Also do it unconditionally, as it does not hurt.
Closes: #315149
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This seems to cause Bug#756162, as in that case the depcache
was NULL.
I'm not entirely sure how that happens, but it's better to
be check here rather then crash later on.
Closes: #756162
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Some people type them instead of autoremove and autoclean, so make
them happy.
Closes: #274159
Makes-Happy: Ansgar
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This enables more fine grained control over such exceptions.
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debian/experimental
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It's a tiny diff, so why not? But no need to document it.
Closes: #787846
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Switch to std::unique_ptr, as this is safer than SPtr.
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Thanks: Andre Felipe Machado for initial patch
Closes: 414848
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Gbp-Dch: ignore
Reported-By: g++ -Wsuggest-override
Thanks: g++ -Wsuggest-override
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Sources are usually defined in sources.list (and co) and are pretty
stable, but once in a while a frontend might want to add an additional
"source" like a local .deb file to install this package (No support for
'real' sources being added this way as this is a multistep process).
We had a hack in place to allow apt-get and apt to pull this of for a
short while now, but other frontends are either left in the cold by this
and/or the code for it looks dirty with FIXMEs plastering it and has on
top of this also some problems (like including these 'volatile' sources
in the srcpkgcache.bin file).
So the biggest part in this commit is actually the rewrite of the cache
generation as it is now potentially a three step process. The biggest
problem with adding support now through is that this makes a bunch of
previously mostly unusable by externs and therefore hidden classes
public, so a bit of further tuneing on this now public API is in order…
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Before MultiArch implicits weren't a thing, so they were hidden by
default by definition. Adding them for MultiArch solved many problems,
but having no reliable way of detecting which dependency (and provides)
is implicit or not causes problems everytime we want to output
dependencies without confusing our observers with unneeded
implementation details.
The really notworthy point here is actually that we keep now a better
record of how a dependency came to be so that we can later reason about
it more easily, but that is hidden so deep down in the library internals
that change is more the problems it solves than the change itself.
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We aren't and we will not be really compatible again with the previous
stable abi, so lets drop these markers (which never made it into a
released version) for good as they have outlived their intend already.
Git-Dch: Ignore
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With a bit of trickery and the Curiously recurring template pattern we
can free us from our use of virtual in the iterators were it is unneeded
bloat as we never deal with pointers to iterators and similar such.
Git-Dch: Ignore
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Further abstracting our new ShowList allows to use it for containers of
strings as well giving us the option to implement an or-groups display
for the recommends and suggests lists which is a nice trick given that
it also helps with migrating the last remaining other cases of old
ShowList.
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Housekeeping. This used to be embedded in apt-get directly, then moved
to into our (then new) private lib and now header and code get a proper
separation.
Git-Dch: Ignore
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apt-get is displaying various lists of package names, which until now it
was building as a string before passing it to ShowList, which inserted
linebreaks at fitting points and showed a title if needed, but it never
really understood what it was working with. With the help of C++11 the
new generic knows not only what it works with, but generates the list on
the fly rather than asking for it and potentially discarding parts of
the input (= the non-default verbose display). It also doubles as a test
for how usable the CacheSets are with C++11.
(Not all callers are adapted yet.)
Git-Dch: Ignore
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'files' is a bit too generic as a name for a command usually only used
programmatically (if at all) by developers, so instead of "wasting" this
generic name for this we use "indextargets" which is actually the name
of the datastructure the displayed data is stored in.
Along with this rename the config options are renamed accordingly.
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Six years ago in 55a5a46c235a30bf024fb2301066553953701cc5 apt-get
learned to disable locking if run as normal user and show a message.
Helmut Grohne rightly suggests on IRC now that there isn't much point in
getting the locks for root either as the output isn't in any way more
authoritive than without locking given that after this call the lock is
freed and any action can sneak in before we make the next call. So we
exchange no benefit for the disavantage of blocking real calls. This can
be especially confusing with the aliases --no-act and --just-print.
We do not print the message we print for users through as the non-root
users can be confronted with a lot more difference via unreadable files.
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C++11 adds the 'override' specifier to mark that a method is overriding
a base class method and error out if not. We hide it in the APT_OVERRIDE
macro to ensure that we keep compiling in pre-c++11 standards.
Reported-By: clang-modernize -add-override -override-macros
Git-Dch: Ignore
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The "problem" is mostly in the erase() definitions as they slightly
conflict and in pre-c++11 are not uniformly in different containers.
By differenciating based on the standard we can provide erase() methods
for both standards – and as the method is in a template and inline we
don't need to worry about symbols here.
The rest is adding wrappings for the new forward_list and unordered_set
containers and correcting our iterators to use the same trait as the
iterator they are wrapping instead of having all of them be simple
forward iterators. This allows the use of specialized algorithms which
are picked based on iterator_traits and implementing them all is simple
to do as we can declare all methods easily and only if they are called
they will generate errors (if the underlying iterator doesn't support
these).
Git-Dch: Ignore
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Various small leaks here and there. Nothing particularily big, but still
good to fix. Found by the sanitizers while running our testcases.
Reported-By: gcc -fsanitize
Git-Dch: Ignore
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It shouldn't be too common, but sometimes people have multiple mirrors
in the sources or otherwise repositories with the same content. Now that
we gracefully can handle multiple requests to the same URI, we can also
fold multiple requests with the same expected hashes into one. Note that
this isn't trying to find oppertunities for merging, but just merges if
it happens to encounter the oppertunity for it.
This is most obvious in the new testcase actually as it needs to delay
the action to give the acquire system enough time to figure out that
they can be merged.
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Again, consistency is the main sellingpoint here, but this way it is now
also easier to explain that some files move through different stages and
lines are printed for them hence multiple times: That is a bit hard to
believe if the number is changing all the time, but now that it keeps
consistent.
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Selecting targets based on the Release they belong to isn't to
unrealistic. In fact, it is assumed to be the most used case so it is
made the default especially as this allows to bundle another thing we
have to be careful with: Filenames and only showing targets we have
acquired.
Closes: 752702
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Downloading additional files is only half the job. We still need a way
to allow external tools to know where the files are they requested for
download given that we don't want them to choose their own location.
'apt-get files' is our answer to this showing by default in a deb822
format information about each IndexTarget with the potential to filter
the records based on lines and an option to change the output format.
The command serves also as an example on how to get to this information
via libapt.
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While it is mostly busywork to rewrite all instances it actually fixes
bugs as the data storage used by the new method is std::string rather
than a char*, the later mostly created by c_str() from a std::string
which the caller has to ensure keeps in scope – something apt-ftparchive
actually didn't ensure and relied on copy-on-write behavior instead
which c++11 forbids and hence the new default gcc abi doesn't use it.
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This isn't testing much of the 'complex' parts,
but its better than nothing for now.
Git-Dch: Ignore
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Working with strings c-style is complicated and error-prune,
so by converting to c++ style we gain some simplicity and
avoid buffer overflows by later extensions.
Git-Dch: Ignore
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You would think one instance of this is enough, but
80e8d923ebc8d5f3f84eb3f922b28ca309c25026 wasn't as
globally applied as the commit message suggested…
LP: #1399037
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Git-Dch: Ignore
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By convention, if I run a tool with --help or --version I expect it to
exit successfully with the usage, while if I do call it wrong (like
without any parameters) I expect the usage message shown with a non-zero
exit.
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Git-Dch: Ignore
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partial files are chowned by the Item baseclass to let the methods work
with them. Now, this baseclass is also responsible for chowning the
files back to root instead of having various deeper levels do this.
The consequence is that all overloaded Failed() methods now call the
Item::Failed base as their first step. The same is done for Done().
The effect is that even in partial files usually don't belong to
_apt anymore, helping sneakernets and reducing possibilities of a bad
method modifying files not belonging to them.
The change is supported by the framework not only supporting being run
as root, but with proper permission management, too, so that privilege
dropping can be tested with them.
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The conversion to accept only relevant options for commands has
forgotten another one, so adding it again even through the usecase might
very well be equally good served by --print-uris.
Closes: 742578
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We are checking the space requirements for ages, but the check uses the
free blocks count, which includes the blocks reserved for usage by root.
Now that we use an unprivileged user it has no access to these blocks
anymore – and more importantly these blocks are a reserve, they
shouldn't be used by apt without special encouragement by the user as it
would be bad to have dpkg run out of diskspace and maintainerscripts
like man-db skip certain actions if not enough space is available
freely.
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Privilege dropping breaks download/source/changelog commands as they
require the _apt user to have write permissions in the current directory,
which is e.g. the case in /tmp, but not in /root, so we disable the
privilege dropping if we deal with such a directory based on idea and
code by Michael Vogt.
The alternative would be to download always to a temp directory and move
it then done, but this breaks partial file support. To resolve this, we
could move to one of our partial/ directories, but this would require a
lock which would block root from using two of these commands in
parallel. As both seems unacceptable we instead let the user choose what
to do: Either a directory is setupped for _apt, downloading as root is
accepted or – which is potentially even better – an unprivileged user is
used for the commands.
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Some distributions (or repositories) do not have as much
"Ign-discipline" as I would like to, so that could be pretty distracting
for our users if enabled by default. It is handy for testcases though.
Git-Dch: Ignore
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consistently using Item::Failed in all specializec classes helps setting
up some information bits otherwise unset, so some errors had an empty
reason as an error. Ign is upgraded to display the error message we
ignored to further help in understanding what happens.
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Reworks the API involved in creating and setting up the fetcher to be a
bit more pleasent to look at and work with as e.g. an empty string for
no lock isn't very nice. With the lock we can also stop creating all our
partial directories "just in case". This way we can also be a bit more
aggressive with the partial directory itself as with a lock, we know we
will gone need it.
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The configuration key Acquire::AllowInsecureRepositories controls if
apt allows loading of unsigned repositories at all.
The configuration Acquire::AllowDowngradeToInsecureRepositories
controls if a signed repository can ever become unsigned. This
should really never be needed but we provide it to avoid having
to mess around in /var/lib/apt/lists if there is a use-case for
this (which I can't think of right now).
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