devtool/sdk.py: error out in case of downloading file failure

It's possible that downloading file from updateserver fails. In
this case, we should error out instead of continue.

We have users reporting unexpected behavior of 'devtool sdk-update'.
When an invalid url is supplied, e.g., `devtool sdk-update http://invalid',
the program reports 'Note: Already up-to-date'.

This is obviously not expected. We should error out in such case.

(From OE-Core rev: 449564783dfb162536a2f772b3a8704973221e0f)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/sdk.py

@@ -145,6 +145,9 @@ def sdk_update(args, config, basepath, workspace):
         # Fetch manifest from server
         tmpmanifest = os.path.join(tmpsdk_dir, 'conf', 'sdk-conf-manifest')
         ret = subprocess.call("wget -q -O %s %s/conf/sdk-conf-manifest" % (tmpmanifest, updateserver), shell=True)
+        if ret != 0:
+            logger.error("Cannot dowload files from %s" % updateserver)
+            return ret
         changedfiles = check_manifest(tmpmanifest, basepath)
         if not changedfiles:
             logger.info("Already up-to-date")