[gentoo-portage-dev] [PATCH] missing-rebuild package set

[Lucian Poston]

The following patchs add a library dependency rebuilder as a package
set, @missing-rebuild, to portage-2.2_rc6.  Similar to the --library
flag in revdep-rebuild, the user can additionally emerge the set of
packages containing consumers of libraries matched by a (python)
regular expression; however, until a better solution is found, the
regexp must be passed through the LIBRARY environment variable to
enable that feature.

Known issues: I expect some false positives. I've inserted hard coded
directory/library masks for those I've found. I noticed a situation
that required a second emerge due to a provider package satisfying 3
conditions: 1) the package is installed and an updated version is
available in its slot, 2) the updated version is in the set due to a
dependency of another package (or it may contains a broken binary),
and 3) a consumer package of a library within the updated package is
emerged before the updated dependency is emerged, causing a package to
be compiled against the old library before the library version
changes.  I guess that if a package is already installed, it is not
necessarily placed before its consumer packages in the merge order.

Attached are patches for pym/portage/dbapi/vartree.py,
pym/portage/sets/libs.py and /usr/share/portage/config/sets.conf.
These can also be found in the project's repository:
http://repo.or.cz/w/revdep-rebuild-reimplementation.git?a=tree;h=refs/heads/rc1;hb=refs/heads/rc1

I warmly welcome all feedback, in particular any suggestions to remove
the necessity of directory and library masks in /etc/revdep-rebuild/*,
which I've been unable to entirely avoid.

Lucian