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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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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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Doing this disables the implicit copy assignment operator (among others)
which would cause hovac if used on the classes as it would just copy the
pointer, not the data the d-pointer points to. For most of the classes
we don't need a copy assignment operator anyway and in many classes it
was broken before as many contain a pointer of some sort.
Only for our Cacheset Container interfaces we define an explicit copy
assignment operator which could later be implemented to copy the data
from one d-pointer to the other if we need it.
Git-Dch: Ignore
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To have a chance to keep the ABI for a while we need all three to team
up. One of them missing and we might loose, so ensuring that they are
available is a very tedious but needed task once in a while.
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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The breakage is just to big for now, so guard the change with
#ifndef APT_8_CLEANER_HEADERS and be nice to library users
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invalid in most cases anyway
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- make pkgPolicy public again, libapt-pkg-perl (and probably
others) get unhappy without that
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- get the candidate either from an already built depcache
or use the policy which is a bit faster than depcache generation
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- split Open() into submethods to be able to build only parts
- make the OpProgress optional in the Cache buildprocess
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as it does not require a cachefile at all
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for apt-get update like operations for the frontends and also provides
hooks to run stuff in APT::Update::{Pre,Post}-Invoke
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- move the code that does the work from apt-get.cc to pkgCacheFile::ListUpdate()
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Author: jgg
Date: 2002-04-27 04:28:04 GMT
'apt-get update' no longer does 'Building Dependency Tree'.
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Author: jgg
Date: 2001-02-20 07:03:16 GMT
Join with aliencode
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Author: jgg
Date: 1999-06-27 03:18:28 GMT
Cache operator
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Author: jgg
Date: 1999-06-12 03:43:48 GMT
Added [] operators to cachefile
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Author: jgg
Date: 1999-04-18 06:36:36 GMT
Support for memory-only caching
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