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Using a different user for calling methods is intended to protect us
from methods running amok (via remotely exploited bugs) by limiting what
can be done by them. By using root:root for the final directories and
just have the files in partial writeable by the methods we enhance this
in sofar as a method can't modify already verified data in its parent
directory anymore.
As a side effect, this also clears most of the problems you could have
if the final directories are shared without user-sharing or if these
directories disappear as they are now again root owned and only the
partial directories contain _apt owned files (usually none if apt isn't
running) and the directory itself is autocreated with the right
permissions.
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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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Conflicts:
test/integration/test-apt-get-download
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Use a APT::VersionSet instead of a APT::VersionList in DoDownload()
to ensure that there is only one version in the set even if the
user passes multiple identical name/versions on the commandline
(Bug#738103)
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Closes: 738103
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Also adds a friendly note about how many tests were run/passed so that
the end of the testrun isn't all that negative by just showing fails.
(It now tells us that we have 111 tests at the moment!)
Git-Dch: Ignore
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With a bit of trickery we can reuse the usual infrastructure we have in
place to acquire deb files for the 'download' operation as well, which
gains us authentification check & display, error messages, correct
filenames and "downloads" from the root-owned archives.
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- print a friendly message in 'download' if a package can't be
downloaded (Closes: #677887)
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