bitbake: fetch2/wget: attempt checkstatus again if it fails

Some services such as SourceForge seem to struggle to keep up under load, with
the result that over half of the autobuilder checkuri runs fail with
sourceforge.net "connection timed out".

Attempt to mitigate this by re-attempting once the network operation on failure.

(Bitbake rev: 54b1961551511948e0cbd2ac39f19b39b9cee568)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/fetch2/wget.py

@@ -104,7 +104,7 @@ class Wget(FetchMethod):
 
         return True
 
-    def checkstatus(self, fetch, ud, d):
+    def checkstatus(self, fetch, ud, d, try_again=True):
         import urllib.request, urllib.error, urllib.parse, socket, http.client
         from urllib.response import addinfourl
         from bb.fetch2 import FetchConnectionCache
@@ -278,9 +278,13 @@ class Wget(FetchMethod):
             r.get_method = lambda: "HEAD"
             opener.open(r)
         except urllib.error.URLError as e:
-            # debug for now to avoid spamming the logs in e.g. remote sstate searches
-            logger.debug(2, "checkstatus() urlopen failed: %s" % e)
-            return False
+            if try_again:
+                logger.debug(2, "checkstatus: trying again")
+                return self.checkstatus(fetch, ud, d, False)
+            else:
+                # debug for now to avoid spamming the logs in e.g. remote sstate searches
+                logger.debug(2, "checkstatus() urlopen failed: %s" % e)
+                return False
         return True
 
     def _parse_path(self, regex, s):