cooker: bail out early if no files to build

This prevents a misleading backtrace:
ERROR: no files to build.
Command execution failed: Traceback (most recent call last):
  File ".../bitbake/build/lib/bb/command.py", line 83, in runAsyncCommand
    self.cooker.updateCache()
  File ".../bitbake/build/lib/bb/cooker.py", line 779, in updateCache
    if not self.parser.parse_next():
  File ".../bitbake/build/lib/bb/cooker.py", line 969, in parse_next
    cooker.bb_cache.sync()
UnboundLocalError: local variable 'cooker' referenced before assignment

(Bitbake rev: 060ef3d957615b7eb1209dc0d01ebeb53f8c4edc)

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Chris Larson <clarson@kergoth.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index 938bdeaaea..bf174859cb 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -832,7 +832,8 @@ class BBCooker:
             files = self.get_bbfiles()
 
         if not len(files):
-            bb.msg.error(bb.msg.domain.Collection, "no files to build.")
+            bb.msg.error(bb.msg.domain.Collection, "no recipe files to build, check your BBPATH and BBFILES?")
+            bb.event.fire(CookerExit(), self.configuration.event_data)
 
         newfiles = []
         for f in files: