commit:     5727b3be6b1b99ae6d47873585a8e92e96147a9f
Author:     Arthur Zamarin <arthurzam <AT> gentoo <DOT> org>
AuthorDate: Sun Feb  5 17:53:32 2023 +0000
Commit:     Arthur Zamarin <arthurzam <AT> gentoo <DOT> org>
CommitDate: Sun Feb  5 17:53:32 2023 +0000
URL:        
https://gitweb.gentoo.org/proj/pkgcore/pkgcheck.git/commit/?id=5727b3be

UnusedInherits: fix false positives for eclasses defining special vars

Skip unused warning for eclasses which define special variables like
SRC_URI, HOMEPAGE, etc. In practice it makes any inherit for pypi,
ruby-fakegem, ruby-ng-gnome2, gstreamer-meson to never be considered
unused.

Resolves: https://github.com/pkgcore/pkgcheck/issues/361
Resolves: https://github.com/pkgcore/pkgcheck/issues/540
Signed-off-by: Arthur Zamarin <arthurzam <AT> gentoo.org>

 src/pkgcheck/checks/codingstyle.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/pkgcheck/checks/codingstyle.py 
b/src/pkgcheck/checks/codingstyle.py
index 6fec22ca..a9eb70fa 100644
--- a/src/pkgcheck/checks/codingstyle.py
+++ b/src/pkgcheck/checks/codingstyle.py
@@ -3,7 +3,7 @@
 import re
 from collections import defaultdict
 
-from pkgcore.ebuild.eapi import EAPI
+from pkgcore.ebuild.eapi import EAPI, common_mandatory_metadata_keys
 from snakeoil.mappings import ImmutableDict
 from snakeoil.sequences import stable_unique
 from snakeoil.strings import pluralism
@@ -758,10 +758,9 @@ class InheritsCheck(Check):
 
         # register EAPI-related vars to ignore
         # TODO: add ebuild env vars via pkgcore setting, e.g. PN, PV, P, 
FILESDIR, etc
-        self.eapi_vars = {}
-        for eapi in EAPI.known_eapis.values():
-            s = set(eapi.eclass_keys)
-            self.eapi_vars[eapi] = frozenset(s)
+        self.eapi_vars = {eapi: frozenset(eapi.eclass_keys) for eapi in 
EAPI.known_eapis.values()}
+
+        self.unused_eclass_skiplist = 
frozenset(common_mandatory_metadata_keys) - {"IUSE"}
 
     def get_eclass(self, export, pkg):
         """Return the eclass related to a given exported variable or function 
name."""
@@ -851,10 +850,12 @@ class InheritsCheck(Check):
                 # ignore eclasses with parsing failures
                 unused.discard(eclass)
             else:
-                exported_eclass_keys = pkg.eapi.eclass_keys.intersection(
+                exported_eclass_keys: set[str] = 
pkg.eapi.eclass_keys.intersection(
                     self.eclass_cache[eclass].exported_variable_names
                 )
-                if not self.eclass_cache[eclass].exported_function_names and 
exported_eclass_keys:
+                if 
exported_eclass_keys.intersection(self.unused_eclass_skiplist):
+                    unused.discard(eclass)
+                elif not self.eclass_cache[eclass].exported_function_names and 
exported_eclass_keys:
                     # ignore eclasses that export ebuild metadata (e.g.
                     # SRC_URI, S, ...) and no functions
                     unused.discard(eclass)

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