[layerindex-web][PATCH 1/6] update.py: fix Ctrl+C behaviour

[Paul Eggleton <paul.eggleton@linux.intel.com>]

If the user hit Ctrl+C during the initial info gathering then it didn't
break out of the loop in update.py, so you had to hit Ctrl+C for as many
layers as were involved in the update. Look for exit code 254 from
update_layer.py and stop if it is returned since that indicates Ctrl+C
has been used.

Additionally, ensure we return exit code 254 and print a message from
the main update script when it is interrupted in this way.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
---
 layerindex/update.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/layerindex/update.py b/layerindex/update.py
index 5c83b00..f60b943 100755
--- a/layerindex/update.py
+++ b/layerindex/update.py
@@ -337,7 +337,11 @@ def main():
                     logger.debug('Running layer update command: %s' % cmd)
                     ret, output = run_command_interruptible(cmd)
                     logger.debug('output: %s' % output)
-                    if ret != 0:
+                    if ret == 254:
+                        # Interrupted by user, break out of loop
+                        logger.info('Update interrupted, exiting')
+                        sys.exit(254)
+                    elif ret != 0:
                         continue
                     col = re.search("^BBFILE_COLLECTIONS = \"(.*)\"", output, re.M).group(1) or ''
                     ver = re.search("^LAYERVERSION = \"(.*)\"", output, re.M).group(1) or ''
@@ -418,10 +422,14 @@ def main():
 
                     if ret == 254:
                         # Interrupted by user, break out of loop
-                        break
+                        logger.info('Update interrupted, exiting')
+                        sys.exit(254)
         finally:
             utils.unlock_file(lockfile)
 
+    except KeyboardInterrupt:
+        logger.info('Update interrupted, exiting')
+        sys.exit(254)
     finally:
         update.log = ''.join(listhandler.read())
         update.finished = datetime.now()
-- 
2.14.3