[OE-core] [PATCH 21/24] devtool: show a better error message if meta-files aren't found

[Paul Eggleton]

If the files that the devtool-source class is supposed to create in the
source tree aren't found in the temporary directory then we know that
the class hasn't worked properly - say that explicitly.

Signed-off-by: Paul Eggleton <paul.eggleton at linux.intel.com>
---
 scripts/lib/devtool/standard.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/scripts/lib/devtool/standard.py b/scripts/lib/devtool/standard.py
index 5ac678b..1e7d707 100644
--- a/scripts/lib/devtool/standard.py
+++ b/scripts/lib/devtool/standard.py
@@ -544,11 +544,14 @@ def _extract_source(srctree, keep_temp, devbranch, sync, config, basepath, works
         if not res:
             raise DevtoolError('Extracting source for %s failed' % pn)
 
-        with open(os.path.join(tempdir, 'initial_rev'), 'r') as f:
-            initial_rev = f.read()
+        try:
+            with open(os.path.join(tempdir, 'initial_rev'), 'r') as f:
+                initial_rev = f.read()
 
-        with open(os.path.join(tempdir, 'srcsubdir'), 'r') as f:
-            srcsubdir = f.read()
+            with open(os.path.join(tempdir, 'srcsubdir'), 'r') as f:
+                srcsubdir = f.read()
+        except FileNotFoundError as e:
+            raise DevtoolError('Something went wrong with source extraction - the devtool-source class was not active or did not function correctly:\n%s' % str(e))
         srcsubdir_rel = os.path.relpath(srcsubdir, os.path.join(tempdir, 'workdir'))
 
         tempdir_localdir = os.path.join(tempdir, 'oe-local-files')
-- 
2.9.5