[gentoo-portage-dev] [0/3] BUILD_PKGS, a replacement for build{,sys}pkg FEATURES

[Thomas de Grenier de Latour]

https://bugs.gentoo.org/show_bug.cgi?id=34964

I think this patches could be candidate for the new 2.0.54 branch.

BUILD_PKGS is a new configuration variable which allows choosing
what packages should be built as .tbz2 binaries.

It is a space delimited list of rules, which can be of different
kinds:
 - "*" matches any package
 - "system" matches any package explicitly required by the profile
(or providing a required virtual)
 - category names can be used to match all packages from a given
category (for instance "sys-apps")
 - shell-like patterns on category names are also allowed (for
instance "sys-*")
 - full package names can be used to match a given package (for
instance "app-office/openoffice")
 - shell-like patterns on full packages names are also allowed (for
instance "*/mozilla*")

Note that depend atoms with versions are NOT valid rules (i
thought it would just make things too complicated, for little
benefit).

Rules can be negated with an exclamation mark: "!rule". Negative
rules are actually exceptions against positive rules, and only have
an effect when they are more specific than the most specific rule
matching the package. The less specific rule is "*", then it's
"system", then it's patterns on categories, etc., and the most
specific is the exact full package name.

The point for not using "-" as a negation mark is that BUILD_PKGS
is an incremental variable: removing a rule ("-rule") is different
than adding a negative rule ("!rule").

Some example of valid BUILD_PKGS values:
 - Keep tbz2 for system packages and packages from "sys-something"
categories, but the kernel sources, and also for a few ones known
for the time they take to compile: 
  BUILD_PKGS="system sys-* !sys-kernel kde-* x11-libs/qt"
 - Keep tbz2 for everything but kernel sources and -bin packages:
  BUILD_PKGS="* !sys-kernel !*/*-bin"

Note that this patches deprecate the "buildpkg" and "buildsyspkg"
FEATURES flags.  This flags will still work, but with a warning, and
their implementation will actually be a simple append to the
BUILD_PKGS configuration variable.

Oh, and if the name "BUILD_PKGS" sucks, feel free to sed the
patches for something better.


Thanks,

-- 
TGL.
-- 
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