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This allows running tests in parallel.
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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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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Provided is a specialized acquire item which given a version can figure
out the correct URI to try by itself and if not provides an error
message alongside with static methods to get just the URI it would try
to download if it should just be displayed or similar such.
The URI is constructed as follows:
Release files can provide an URI template in the "Changelogs" field,
otherwise we lookup a configuration item based on the "Label" or
"Origin" of the Release file to get a (hopefully known) default value
for now. This template should contain the string CHANGEPATH which is
replaced with the information about the version we want the changelog
for (e.g. main/a/apt/apt_1.1). This middleway was choosen as this path
part was consistent over the three known implementations (+1 defunct),
while the rest of the URI varies widely between them.
The benefit of this construct is that it is now easy to get changelogs
for Debian packages on Ubuntu and vice versa – even at the moment where
the Changelogs field is present nowhere. Strictly better than what
apt-get had before as it would even fail to get changelogs from
security… Now it will notice that security identifies as Origin: Debian
and pick this setting (assuming again that no Changelogs field exists).
If on the other hand security would ship its changelogs in a different
location we could set it via the Label option overruling Origin.
Closes: 687147, 739854, 784027, 787190
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We use test{success,failure} now all over the place in the framework, so
its only consequencial to do this in the situations in which we test for
a specific output as well.
Git-Dch: Ignore
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While on linux files are created in /tmp with $USER:$USER, on my
kfreebsd testmachine they are created with $USER:root, so we pull some
strings here to make it work on both.
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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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Running the testcases is usually not a good idea, but it can be handy to
check if the privilege dropping works.
Git-Dch: Ignore
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apt-get download and changelog as well as apt-helper reuse the acquire
system for their own proposes without requiring the directories the
fetcher wants to create, which is a problem if you run them as non-root
and the directories do not exist as it greets you with:
E: Archives directory /var/cache/apt/archives/partial is missing. -
Acquire (13: Permission denied)
Closes: 762898
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Most pagers are nice and default to running non-interactively if they
aren't connected to a terminal and we relied on that. On ci.debian.net
the configured pager is printing a header out of nowhere though, so if
we are printing to a non-terminal we call "cat" instead.
In the rework we also "remove" the dependency on sensible-utils in sofar
as we call some alternatives if calling the utils fail.
This seems to be the last problem preventing a "PASS" status on
ci.debian.net, so we close the associated bugreport.
Closes: 755040
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Git-Dch: Ignore
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- print URIs for all changelogs in case of --print-uris,
thanks to Daniel Hartwig for the patch! (Closes: #674897)
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