emerge: fix --autounmask-continue to work with --getbinpkg (bug 614474)

Fix action_build to populate binarytree instances with remote package
metadata following config reload, using a new getbinpkg_refresh=False
parameter to prevent redundant fetching of remote package metadata.

X-Gentoo-bug: 614474
X-Gentoo-bug-url: https://bugs.gentoo.org/show_bug.cgi?id=614474
Fixes: e2d88ef ("Add emerge --autounmask-continue option (bug 582624)")
Acked-by: Brian Dolbec <dolsen@gentoo.org>

pym/_emerge/actions.py

@@ -347,6 +347,21 @@ def action_build(emerge_config, trees=DeprecationWarning,
 			adjust_configs(emerge_config.opts, emerge_config.trees)
 			settings, trees, mtimedb = emerge_config
 
+			# After config reload, the freshly instantiated binarytree
+			# instances need to load remote metadata if --getbinpkg
+			# is enabled. Use getbinpkg_refresh=False to use cached
+			# metadata, since the cache is already fresh.
+			if "--getbinpkg" in emerge_config.opts:
+				for root_trees in emerge_config.trees.values():
+					try:
+						root_trees["bintree"].populate(
+							getbinpkgs=True,
+							getbinpkg_refresh=False)
+					except ParseError as e:
+						writemsg("\n\n!!!%s.\nSee make.conf(5) for more info.\n"
+								 % e, noiselevel=-1)
+						return 1
+
 		if "--autounmask-only" in myopts:
 			mydepgraph.display_problems()
 			return 0

pym/portage/dbapi/bintree.py

@@ -510,8 +510,16 @@ def _file_permissions(self, path):
 			except PortageException:
 				pass
 
-	def populate(self, getbinpkgs=0):
-		"populates the binarytree"
+	def populate(self, getbinpkgs=False, getbinpkg_refresh=True):
+		"""
+		Populates the binarytree with package metadata.
+
+		@param getbinpkgs: include remote packages
+		@type getbinpkgs: bool
+		@param getbinpkg_refresh: attempt to refresh the cache
+			of remote package metadata if getbinpkgs is also True
+		@type getbinpkg_refresh: bool
+		"""
 
 		if self._populating:
 			return
@@ -522,13 +530,13 @@ def populate(self, getbinpkgs=0):
 				pkgindex_lock = lockfile(self._pkgindex_file,
 					wantnewlockfile=1)
 			self._populating = True
-			self._populate(getbinpkgs)
+			self._populate(getbinpkgs, getbinpkg_refresh=getbinpkg_refresh)
 		finally:
 			if pkgindex_lock:
 				unlockfile(pkgindex_lock)
 			self._populating = False
 
-	def _populate(self, getbinpkgs=0):
+	def _populate(self, getbinpkgs=False, getbinpkg_refresh=True):
 		if (not os.path.isdir(self.pkgdir) and not getbinpkgs):
 			return 0
 
@@ -832,6 +840,9 @@ def _populate(self, getbinpkgs=0):
 				url = base_url.rstrip("/") + "/Packages"
 				f = None
 
+				if not getbinpkg_refresh and local_timestamp:
+					raise UseCachedCopyOfRemoteIndex()
+
 				try:
 					ttl = float(pkgindex.header.get("TTL", 0))
 				except ValueError: