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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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This updates the documentation for a change which actually happened in
c2a4a8dded2dfb56dbcab9689b6cb4b96c9999b6 already. The acquire system
expects the $(SITE) to be there (e.g. for mirror rewriting) so we are
better of prefixing it automatically than giving frontends the chance to
forget it. There is no point in not showing $(SITE) first anyway.
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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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Gbp-Dch: ignore
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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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This way we do not depend on the decompressor programs anymore.
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Git-Dch: ignore
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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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This ensures that we can install .deb files that are not the
candidate for a given package.
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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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It was not nice to use 2 * number of cores in all cases.
Thanks: Jakub Wilk for the suggestion
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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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Git-Dch: Ignore
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For many usecases like the acquire system libapt-pkg actually needs
tools and config found in the apt package. apt tends to be installed
everywhere libapt-pkg appears usually anyhow, but just in case to nudge
users (and tools) in the right direction.
Note that this isn't and shouldn't be a hard depends as there are
usecases working perfectly without 'apt' and as this is such an esoteric
problem incurring the costs arising from a Depends-Breaks-loop isn't
deemd as worth it.
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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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Closes: 796059
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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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Git-Dch: Ignore
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Git-Dch: Ignore
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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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Thanks: Julian Andres Klode
Git-Dch: ignore
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Git-Dch: ignore
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Thanks: Niels Thykier for reporting this on IRC
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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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Thanks: Steve Slangasek for the suggestion
Closes: 695633
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feature/srv-records
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Conflicts:
cmdline/apt-helper.cc
cmdline/makefile
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