Bug #250166 - To avoid accidental regeneration of digests with the incorrect

files (such as partially downloaded files), trigger the fetch code if the file
exists and it's size doesn't match the current manifest entry. If there really
is a legitimate reason for the digest to change, `ebuild --force digest` can
be used to avoid triggering this code (or else the old digests can be manually
removed from the Manifest). (trunk r12185:12188)

svn path=/main/branches/2.1.6/; revision=12221

1 files changed, 29 insertions, 21 deletions

diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index 931947a66..ae499bcb2 100644
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -4234,32 +4234,40 @@ def digestgen(myarchives, mysettings, overwrite=1, manifestonly=0, myportdb=None
 		required_hash_types.add("size")
 		required_hash_types.add(portage.const.MANIFEST2_REQUIRED_HASH)
 		dist_hashes = mf.fhashdict.get("DIST", {})
-		missing_hashes = set()
+
+		# To avoid accidental regeneration of digests with the incorrect
+		# files (such as partially downloaded files), trigger the fetch
+		# code if the file exists and it's size doesn't match the current
+		# manifest entry. If there really is a legitimate reason for the
+		# digest to change, `ebuild --force digest` can be used to avoid
+		# triggering this code (or else the old digests can be manually
+		# removed from the Manifest).
+		missing_files = []
 		for myfile in distfiles_map:
 			myhashes = dist_hashes.get(myfile)
 			if not myhashes:
-				missing_hashes.add(myfile)
-				continue
-			if required_hash_types.difference(myhashes):
-				missing_hashes.add(myfile)
+				missing_files.append(myfile)
 				continue
-			if myhashes["size"] == 0:
-				missing_hashes.add(myfile)
-		if missing_hashes:
-			missing_files = []
-			for myfile in missing_hashes:
-				try:
-					st = os.stat(os.path.join(mysettings["DISTDIR"], myfile))
-				except OSError, e:
-					if e.errno != errno.ENOENT:
-						raise
-					del e
+			size = myhashes.get("size")
+
+			try:
+				st = os.stat(os.path.join(mysettings["DISTDIR"], myfile))
+			except OSError, e:
+				if e.errno != errno.ENOENT:
+					raise
+				del e
+				if size == 0:
 					missing_files.append(myfile)
-				else:
-					# If the file is empty then it's obviously invalid.
-					if st.st_size == 0:
-						missing_files.append(myfile)
-			if missing_files:
+					continue
+				if required_hash_types.difference(myhashes):
+					missing_files.append(myfile)
+					continue
+			else:
+				if st.st_size == 0 or size is not None and size != st.st_size:
+					missing_files.append(myfile)
+					continue
+
+		if missing_files:
 				mytree = os.path.realpath(os.path.dirname(
 					os.path.dirname(mysettings["O"])))
 				fetch_settings = config(clone=mysettings)