expand_new_virt: validate EAPI, IUSE and USE

diff --git a/pym/_emerge/actions.py b/pym/_emerge/actions.py
index ce52d406738bb05fe5dcdf64e22a6016982110ca..68b82825608133f77a1714fc0df5e31b89520f58 100644 (file)
--- a/pym/_emerge/actions.py
+++ b/pym/_emerge/actions.py
@@ -31,7 +31,7 @@ from portage.cache.cache_errors import CacheError
 from portage.const import GLOBAL_CONFIG_PATH, NEWS_LIB_PATH
 from portage.const import _ENABLE_DYN_LINK_MAP
 from portage.dbapi.dep_expand import dep_expand
-from portage.dep import Atom, extended_cp_match
+from portage.dep import Atom, extended_cp_match, _get_useflag_re
 from portage.exception import InvalidAtom
 from portage.output import blue, bold, colorize, create_color_func, darkgreen, \
        red, yellow
@@ -1310,10 +1310,31 @@ def expand_new_virt(vardb, atom):
                        continue
 
                traversed.add(virt_cpv)
-               rdepend, use = vardb.aux_get(virt_cpv, ["RDEPEND", "USE"])
-               use = frozenset(use.split())
+               eapi, iuse, rdepend, use = vardb.aux_get(virt_cpv,
+                       ["EAPI", "IUSE", "RDEPEND", "USE"])
+               if not portage.eapi_is_supported(eapi):
+                       yield atom
+                       continue
+
+               # Validate IUSE and IUSE, for early detection of vardb corruption.
+               useflag_re = _get_useflag_re(eapi)
+               valid_iuse = []
+               for x in iuse.split():
+                       if x[:1] in ("+", "-"):
+                               x = x[1:]
+                       if useflag_re.match(x) is not None:
+                               valid_iuse.append(x)
+               valid_iuse = frozenset(valid_iuse)
+
+               iuse_implicit_match = vardb.settings._iuse_implicit_match
+               valid_use = []
+               for x in use.split():
+                       if x in valid_iuse or iuse_implicit_match(x):
+                               valid_use.append(x)
+               valid_use = frozenset(valid_use)
+
                success, atoms = portage.dep_check(rdepend,
-                       None, vardb.settings, myuse=use,
+                       None, vardb.settings, myuse=valid_use,
                        myroot=vardb.root, trees={vardb.root:{"porttree":vardb.vartree,
                        "vartree":vardb.vartree}})