bitbake/cooker: avoid printing stack trace for -b match error

Improves error output for matching problems when the -b / --buildfile
command line option is used.

Rename MultipleMatches exception to NoSpecificMatch (as it is also
raised when there are no matching recipes) and make it inherit from
BBHandledException so that it doesn't print a stack trace (we always log
an ERROR prior to raising it.)

In addition, improve the formatting of the error message - only call the
log function once rather than once for every match, and use a more
appropriate message if there are no matches.

Fixes [YOCTO #1141]

(Bitbake rev: 803550a5098ec878164245e71344c3d687310b72)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 11 insertions, 6 deletions

diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index 194046ea91..6041410575 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -44,9 +44,9 @@ buildlog    = logging.getLogger("BitBake.Build")
 parselog    = logging.getLogger("BitBake.Parsing")
 providerlog = logging.getLogger("BitBake.Provider")
 
-class MultipleMatches(Exception):
+class NoSpecificMatch(bb.BBHandledException):
     """
-    Exception raised when multiple file matches are found
+    Exception raised when no or multiple file matches are found
     """
 
 class NothingToBuild(Exception):
@@ -979,10 +979,15 @@ class BBCooker:
         """
         matches = self.matchFiles(buildfile)
         if len(matches) != 1:
-            parselog.error("Unable to match %s (%s matches found):" % (buildfile, len(matches)))
-            for f in matches:
-                parselog.error("    %s" % f)
-            raise MultipleMatches
+            if matches:
+                msg = "Unable to match '%s' to a specific recipe file - %s matches found:" % (buildfile, len(matches))
+                if matches:
+                    for f in matches:
+                        msg += "\n    %s" % f
+                parselog.error(msg)
+            else:
+                parselog.error("Unable to find any recipe file matching '%s'" % buildfile)
+            raise NoSpecificMatch
         return matches[0]
 
     def buildFile(self, buildfile, task):