emerge --usepkgonly: propagate implicit IUSE and USE_EXPAND (bug 640318)
For emerge --usepkgonly mode, it's useful to be able to operate without
dependence on a local ebuild repository and profile. Therefore,
merge Packages header settings from the binary package database
(including binhost(s) if enabled) into the profile configuration,
in order to propagate implicit IUSE and USE_EXPAND settings for use
with binary and installed packages. Values are appended, so the result
is a union of elements.
Also use ARCH from the binary package database if it's not defined by
the profile, since ARCH is used for validation by emerge's profile_check
function, and also for KEYWORDS logic in the _getmaskingstatus function.
All changes are currently confined to --usepkgonly mode, since this is
the mode where it is needed the most, and this ensures that behavior of
source-based builds is completely unaffected.
The changes only affect dependency calculations (where implicit IUSE
plays a role) and the user interface (display of USE_EXPAND flags).
The bash execution environment for binary and installed packages is
completely unaffected, since that environment relies on variables loaded
from environment.bz2 files.
Bug: https://bugs.gentoo.org/640318
5 files changed
