ebuild(1): ensure REQUIRED_USE is satisfied

diff --git a/pym/portage/package/ebuild/doebuild.py b/pym/portage/package/ebuild/doebuild.py
index bbc3a4a128eb737beb970e4d0c8c94c9ea243f07..2eb9f11bc6d32b4c4ae2318368570889552eca8d 100644 (file)
--- a/pym/portage/package/ebuild/doebuild.py
+++ b/pym/portage/package/ebuild/doebuild.py
@@ -39,9 +39,10 @@ from portage.data import portage_gid, portage_uid, secpass, \
        uid, userpriv_groups
 from portage.dbapi.porttree import _parse_uri_map
 from portage.dbapi.virtual import fakedbapi
-from portage.dep import Atom, paren_enclose, use_reduce
+from portage.dep import Atom, check_required_use, \
+       human_readable_required_use, paren_enclose, use_reduce
 from portage.eapi import eapi_exports_KV, eapi_exports_merge_type, \
-       eapi_exports_replace_vars, \
+       eapi_exports_replace_vars, eapi_has_required_use, \
        eapi_has_src_prepare_and_src_configure, eapi_has_pkg_pretend
 from portage.elog import elog_process
 from portage.elog.messages import eerror, eqawarn
@@ -1056,6 +1057,28 @@ def _validate_deps(mysettings, myroot, mydo, mydbapi):
                if mydo not in invalid_dep_exempt_phases:
                        return 1
 
+       if not pkg.built and pkg.metadata["REQUIRED_USE"] and \
+               eapi_has_required_use(pkg.metadata["EAPI"]):
+               result = check_required_use(pkg.metadata["REQUIRED_USE"],
+                       pkg.use.enabled, pkg.iuse.is_valid_flag)
+               if not result:
+                       reduced_noise = result.tounicode()
+                       writemsg("\n  %s\n" % _("The following REQUIRED_USE flag" + \
+                               " constraints are unsatisfied:"), noiselevel=-1)
+                       writemsg("    %s\n" % reduced_noise,
+                               noiselevel=-1)
+                       normalized_required_use = \
+                               " ".join(pkg.metadata["REQUIRED_USE"].split())
+                       if reduced_noise != normalized_required_use:
+                               writemsg("\n  %s\n" % _("The above constraints " + \
+                                       "are a subset of the following complete expression:"),
+                                       noiselevel=-1)
+                               writemsg("    %s\n" % \
+                                       human_readable_required_use(normalized_required_use),
+                                       noiselevel=-1)
+                       writemsg("\n", noiselevel=-1)
+                       return 1
+
        return os.EX_OK
 
 # XXX This would be to replace getstatusoutput completely.