unmerge: use expand_new_virt for sys pkg warnings

1 files changed, 66 insertions, 0 deletions

diff --git a/pym/portage/dbapi/_expand_new_virt.py b/pym/portage/dbapi/_expand_new_virt.py
new file mode 100644
index 000000000..7a233f10b
--- /dev/null
+++ b/pym/portage/dbapi/_expand_new_virt.py
@@ -0,0 +1,66 @@
+# Copyright 2011 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+import portage
+from portage.dep import Atom, _get_useflag_re
+
+def expand_new_virt(vardb, atom):
+	"""
+	Iterate over the recursively expanded RDEPEND atoms of
+	a new-style virtual. If atom is not a new-style virtual
+	or it does not match an installed package then it is
+	yielded without any expansion.
+	"""
+	if not isinstance(atom, Atom):
+		atom = Atom(atom)
+	traversed = set()
+	stack = [atom]
+
+	while stack:
+		atom = stack.pop()
+		if atom.blocker:
+			yield atom
+			continue
+
+		matches = vardb.match(atom)
+		if not (matches and matches[-1].startswith("virtual/")):
+			yield atom
+			continue
+
+		virt_cpv = matches[-1]
+		if virt_cpv in traversed:
+			continue
+
+		traversed.add(virt_cpv)
+		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=valid_use,
+			myroot=vardb.root, trees={vardb.root:{"porttree":vardb.vartree,
+			"vartree":vardb.vartree}})
+
+		if success:
+			stack.extend(atoms)
+		else:
+			yield atom