manifest: controllable per repo

This adds three states to layout.conf key use-manifest; false, true, and strict.

false means "don't use manifests at all"
true means "use and generate manifests, but allow them to be missing"
strict means "manifests must be used everywhere in this repo"

BUG=chromium-os:11308
TEST=repoman manifest usage.

1 files changed, 9 insertions, 2 deletions

diff --git a/pym/portage/manifest.py b/pym/portage/manifest.py
index 449f9fdf4..7cac09cde 100644
--- a/pym/portage/manifest.py
+++ b/pym/portage/manifest.py
@@ -100,7 +100,8 @@ class Manifest2Entry(ManifestEntry):
 class Manifest(object):
 	parsers = (parseManifest2,)
 	def __init__(self, pkgdir, distdir, fetchlist_dict=None,
-		manifest1_compat=DeprecationWarning, from_scratch=False, thin=False):
+		manifest1_compat=DeprecationWarning, from_scratch=False, thin=False,
+			allow_missing=False, allow_create=True):
 		""" Create new Manifest instance for package in pkgdir.
 		    Do not parse Manifest file if from_scratch == True (only for internal use)
 			The fetchlist_dict parameter is required only for generation of
@@ -135,6 +136,8 @@ class Manifest(object):
 			self.guessType = guessThinManifestFileType
 		else:
 			self.guessType = guessManifestFileType
+		self.allow_missing = allow_missing
+		self.allow_create = allow_create
 
 	def getFullname(self):
 		""" Returns the absolute path to the Manifest file for this instance """
@@ -237,6 +240,8 @@ class Manifest(object):
 
 	def write(self, sign=False, force=False):
 		""" Write Manifest instance to disk, optionally signing it """
+		if not self.allow_create:
+			return
 		self.checkIntegrity()
 		try:
 			myentries = list(self._createManifestEntries())
@@ -265,7 +270,7 @@ class Manifest(object):
 				if myentries:
 					write_atomic(self.getFullname(), "".join("%s\n" %
 						str(myentry) for myentry in myentries))
-				else:
+				elif self.thin:
 					# With thin manifest, there's no need to have
 					# a Manifest file if there are no DIST entries.
 					try:
@@ -330,6 +335,8 @@ class Manifest(object):
 		distfiles to raise a FileNotFound exception for (if no file or existing
 		checksums are available), and defaults to all distfiles when not
 		specified."""
+		if not self.allow_create:
+			return
 		if checkExisting:
 			self.checkAllHashes()
 		if assumeDistHashesSometimes or assumeDistHashesAlways: