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build-dep was implemented by parsing the build-dependencies of a package
and figuring out which packages to install/remove based on this. That
means that for the first level of dependencies build-dep was
implementing its very own resolver with all the benefits (aka: bugs)
this gives us for not using the existing resolver for all levels.
Making this work involves generating a dummy binary package with fitting
Depends and Conflicts and as we can't create them out of thin air the
cache generation needs to be involved so we end up writing a Packages
file which we want to parse – after we have parsed the other Packages
files already. With .dsc/.deb files we could add them before we started
parsing anything.
With a bit of care we can avoid generating too much data we have to
throw away again (as many parts assume that e.g. the count of packages
doesn't change midair), so that on a speed front there shouldn't be
much of a difference, but output can be slightly confusing as if we have
a completely valid cache on disk the "Reading package lists... Done" is
printed two times – but apt is pretty quick about it in that case.
Closes: #137560, #444930, #489911, #583914, #728317, #812173
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Git-Dch: Ignore
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The main part is refactoring through to allow hiding the magic needed to
support .deb files in deeper layers of libapt so that frontends have
less exposure to Debian specific classes like debDebPkgFileIndex.
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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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Git-Dch: Ignore
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While it is a huge undertaking to enable it for our public libraries as
basically everything we exported so far could be seen as public
interface our private library is new and under our full control, so we
can do whatever we like with it. The benefits are not that big in return
of course, but it reduces the size a bit, so thats great nontheless.
Git-Dch: ignore
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Beside being a bit cleaner it hopefully also resolves oddball problems
I have with high levels of parallel jobs.
Git-Dch: Ignore
Reported-By: iwyu (include-what-you-use)
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dist-upgrade 2vcard- 4g8+
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experimental
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