emaint merges: Replace .append() with .add() for set variables (bug 520542)

pkg_atoms and pkg_invalid_entries were changed to sets, but were not updated
in the function that added to them.
Fix porttree_root deprecation warnings

export PYTHONWARNINGS=d to see the warnings that this fixes.
package_tracker.match: account for unevaluated_atom

This fixes the match cache to properly account for
atom.unevaluated_atom, which is required since match_from_list output
depends on atom.unevaluated_atom (for IUSE matching logic). Note that
similar issues were also fixed in commits
d603f1440c814377fbc1965729fd9b6b008cf76d and
5438bb29c996d777b6343515995176912a7c137f.

X-Gentoo-Bug: 515230
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=515230
bin/misc-functions.sh: Empty flag variable 'error' before (re-)use

Prevent subsequent .png files from inheriting error status from earlier
file.

Reviewed-By: Michał Górny <mgorny@gentoo.org>
Acked-By: Brian Dolbec <dolsen@gentoo.org>
vdb: Preserve := when storing uninstalled dependency atoms

Make the slot operator processing code not remove the := operator from
vdb dependency entries when the underlying package is not installed.

This fixes a bug where dependencies like || ( A:= B:= ) were stored as
|| ( A:0/1= B ) if B was not installed. This especially confused
dependency comparisons in @changed-deps.

With this patch, Portage stores the original := (or :slot=) atom in the
vdb. This fixes the issue while preserving the same behavior in the
current dependency resolver.

Acked-by: Alexander Berntsen <bernalex@gentoo.org>
Acked-by: Brian Dolbec <dolsen@gentoo.org>
Reviewed-by: Zac Medico <zmedico@gentoo.org>
sets: Introduce @changed-deps to update packages which need dep changes

The @changed-deps set compares the RDEPEND and PDEPEND entries of
installed packages with the metadata of matching ebuilds, triggering
rebuilds whenever a difference in dependencies is detected.

This set can be used to force installed package metadata updates when
ebuild dependencies are changed in-place. In particular, it can be used
to restore dependency tree integrity after disabling --dynamic-deps.

Acked-by: Alexander Berntsen <bernalex@gentoo.org>
Acked-by: Brian Dolbec <dolsen@gentoo.org>
dep_check: fix bug #515230

This fixes dep_check so that graph packages do not mask non-graph
packages (in the same slot) unless the graph packages also match the
dependency atom being satisfied. This requires logic changes in both
_dep_check_composite_db._visible and dep_zapdeps.

Also, fix _dep_check_composite_db match / _cpv_pkg_map
interactions to ensure correct match results.

X-Gentoo-Bug: 515230
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=515230
_slot_operator_update_probe: fix bug #508762

This fixes the check_reverse_dependencies function (inside the depgraph
_slot_operator_update_probe method) to account for irrelevant parent
atoms from parents that need to be rebuilt or have been involved in
unsolved slot conflicts.

X-Gentoo-Bug: 508762
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=508762
Reviewed-by: Brian Dolbec <dolsen@gentoo.org>
QA: Add a set of checks for bash-completion files

Add checks for common mistakes when installing bash completion files:
legacy directory, incorrect naming, missing aliases, deprecated 'have'
function.

Acked-by: Brian Dolbec <dolsen@gentoo.org>
econf: Replace unnecessary 'case' statements with 'if's

Replace the 'case' statements used to match 'configure' output with
simpler pattern-matching 'if's.

Acked-by: Alexander Berntsen <bernalex@gentoo.org>
econf: Add EAPI-conditional arguments via array

Use a dedicated array variable to add EAPI-conditional arguments to
the configure script instead of prepending them to the command
parameters.
Fix off-by-one error in supported EAPI list

Fix the off-by-one error in construction of supported EAPI list that
resulted in EAPI 5 being considered unsupported.
Make eapi_is_supported() reuse _supported_eapis list

Make the eapi_is_supported() function use the generated list of
supported EAPIs rather than partial lists and integer comparison.
Apply 'nonfatal' to helpers only

Make 'nonfatal' modifier affect helpers only rather than disabling 'die'
completely. This improves the PMS conformance.
Rewrite default ebuild phase setting code

Replace the ebuild phase setting code for EAPI 2 and newer with a
simpler approach; first set proper default_* functions, and call them
within the phase. Disallow calling default_* for other phase functions
than the one being run.
Support EAPI=6_pre1 for testing EAPI6 features
Add tentative support for EAPI6 --docdir and --htmldir

Pass --docdir and --htmldir to configure scripts that support it.
Add tentative support for EAPI6 get_libdir()

Add get_libdir() function to obtain the basename of libdir using
the same algorithm that econf uses.
Add tentative support for EAPI6 einstalldocs function

Add the einstalldocs function to conveniently install documentation
using the default patterns or DOCS and HTML_DOCS variables.
Add tentative support for EAPI6 eapply function

Add the eapply patch applying function.