[PATCH] fetch2: Ensure that incorrect checksumed files are always renamed

[Richard Purdie <richard.purdie@linuxfoundation.org>]

There are some codepaths where the file checksum is verified and can
be found to mismatch but the 'rename' logic doesn't kick in. If code
relies on the presence of a file for the checksum having been checked
(e.g. uninative.bbclass) then it can be used when the checksum hasn't
matched.

Therefore rename the file whenever an invalid checksum is encountered.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index e8cea7f..dc074d5 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -677,7 +677,8 @@ def verify_donestamp(ud, d, origud=None):
         # incorrect stamp file.
         logger.warn("Checksum mismatch for local file %s\n"
                     "Cleaning and trying again." % ud.localpath)
-        rename_bad_checksum(ud, e.checksum)
+        if os.path.exists(ud.localpath):
+            rename_bad_checksum(ud, e.checksum)
         bb.utils.remove(ud.donestamp)
     return False
 
@@ -698,11 +699,21 @@ def update_stamp(ud, d):
             # Errors aren't fatal here
             pass
     else:
-        checksums = verify_checksum(ud, d)
-        # Store the checksums for later re-verification against the recipe
-        with open(ud.donestamp, "wb") as cachefile:
-            p = pickle.Pickler(cachefile, pickle.HIGHEST_PROTOCOL)
-            p.dump(checksums)
+        try:
+            checksums = verify_checksum(ud, d)
+            # Store the checksums for later re-verification against the recipe
+            with open(ud.donestamp, "wb") as cachefile:
+                p = pickle.Pickler(cachefile, pickle.HIGHEST_PROTOCOL)
+                p.dump(checksums)
+        except ChecksumError as e:
+            # Checksums failed to verify, trigger re-download and remove the
+            # incorrect stamp file.
+            logger.warn("Checksum mismatch for local file %s\n"
+                        "Cleaning and trying again." % ud.localpath)
+            if os.path.exists(ud.localpath):
+                rename_bad_checksum(ud, e.checksum)
+            bb.utils.remove(ud.donestamp)
+            raise
 
 def subprocess_setup():
     # Python installs a SIGPIPE handler by default. This is usually not what
@@ -973,7 +984,8 @@ def try_mirror_url(fetch, origud, ud, ld, check = False):
         if isinstance(e, ChecksumError):
             logger.warn("Mirror checksum failure for url %s (original url: %s)\nCleaning and trying again." % (ud.url, origud.url))
             logger.warn(str(e))
-            rename_bad_checksum(ud, e.checksum)
+            if os.path.exists(ud.localpath):
+                rename_bad_checksum(ud, e.checksum)
         elif isinstance(e, NoChecksumError):
             raise
         else:
@@ -1583,7 +1595,8 @@ class Fetch(object):
                         if isinstance(e, ChecksumError):
                             logger.warn("Checksum failure encountered with download of %s - will attempt other sources if available" % u)
                             logger.debug(1, str(e))
-                            rename_bad_checksum(ud, e.checksum)
+                            if os.path.exists(ud.localpath):
+                                rename_bad_checksum(ud, e.checksum)
                         elif isinstance(e, NoChecksumError):
                             raise
                         else: