[PATCH 1/2] bitbake: fetch2: Allow Fetch.download() to warn instead of error

[Peter Kjellerstedt <peter.kjellerstedt@axis.com>]

Under some situations it can be allowed for Fetch.download() to fail
to fetch a file without causing bitbake to fail. By adding
only_warn=True as argument to Fetch.download(), it will call
logger.warning() instead of logger.error() and thus not cause build
failures.

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
---
 bitbake/lib/bb/fetch2/__init__.py | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/bitbake/lib/bb/fetch2/__init__.py b/bitbake/lib/bb/fetch2/__init__.py
index 3eb0e4d211..58f65ada84 100644
--- a/bitbake/lib/bb/fetch2/__init__.py
+++ b/bitbake/lib/bb/fetch2/__init__.py
@@ -1608,9 +1608,10 @@ class Fetch(object):
 
         return local
 
-    def download(self, urls=None):
+    def download(self, urls=None, only_warn=False):
         """
-        Fetch all urls
+        Fetch all urls. In case only_warn is True, a failure to fetch a url
+        will only result in a warning message, rather than an error message.
         """
         if not urls:
             urls = self.urls
@@ -1688,19 +1689,28 @@ class Fetch(object):
 
                 if not localpath or ((not os.path.exists(localpath)) and localpath.find("*") == -1):
                     if firsterr:
-                        logger.error(str(firsterr))
+                        if only_warn:
+                            logger.warning(str(firsterr))
+                        else:
+                            logger.error(str(firsterr))
                     raise FetchError("Unable to fetch URL from any source.", u)
 
                 update_stamp(ud, self.d)
 
             except IOError as e:
                 if e.errno in [os.errno.ESTALE]:
-                    logger.error("Stale Error Observed %s." % u)
+                    if only_warn:
+                        logger.warning("Stale Error Observed %s." % u)
+                    else:
+                        logger.error("Stale Error Observed %s." % u)
                     raise ChecksumError("Stale Error Detected")
 
             except BBFetchException as e:
                 if isinstance(e, ChecksumError):
-                    logger.error("Checksum failure fetching %s" % u)
+                    if only_warn:
+                        logger.warning("Checksum failure fetching %s" % u)
+                    else:
+                        logger.error("Checksum failure fetching %s" % u)
                 raise
 
             finally:
-- 
2.12.0