bitbake/utils.py: Improve traceback to be more helpful/clear to users

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

1 files changed, 23 insertions, 7 deletions

diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index ed28f86c4b..5419af6246 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -350,22 +350,38 @@ def better_exec(code, context, text, realfile):
             raise
 
         # print the Header of the Error Message
-        bb.msg.error(bb.msg.domain.Util, "Error in executing python function in: %s" % realfile)
+        bb.msg.error(bb.msg.domain.Util, "There was an error when executing a python function in: %s" % realfile)
         bb.msg.error(bb.msg.domain.Util, "Exception:%s Message:%s" % (t, value))
 
         # Strip 'us' from the stack (better_exec call)
         tb = tb.tb_next
 
         import traceback
+        textarray = text.split('\n')
+        linefailed = traceback.tb_lineno(tb)
+
         tbextract = traceback.extract_tb(tb)
-        tbextract = "\n".join(traceback.format_list(tbextract))
-        bb.msg.error(bb.msg.domain.Util, "Traceback:")
-        for line in tbextract.split('\n'):
+        tbformat = "\n".join(traceback.format_list(tbextract))
+        bb.msg.error(bb.msg.domain.Util, "The stack trace of python calls that resulted in thie exception/failure was:")
+        for line in tbformat.split('\n'):
             bb.msg.error(bb.msg.domain.Util, line)
 
-        line = traceback.tb_lineno(tb)
-        bb.msg.error(bb.msg.domain.Util, "The lines leading to this error were:")
-        _print_trace( text.split('\n'), line )
+        bb.msg.error(bb.msg.domain.Util, "The code that was being executed was:")
+        _print_trace(textarray, linefailed)
+        bb.msg.error(bb.msg.domain.Util, "(file: '%s', lineno: %s, function: %s)" % (tbextract[0][0], tbextract[0][1], tbextract[0][2]))
+
+        # See if this is a function we constructed and has calls back into other functions in 
+        # "text". If so, try and improve the context of the error by diving down the trace
+        level = 0
+        nexttb = tb.tb_next
+        while nexttb is not None:
+            if tbextract[level][0] == tbextract[level+1][0] and tbextract[level+1][2] == tbextract[level][0]:
+                _print_trace(textarray, tbextract[level+1][1])
+                bb.msg.error(bb.msg.domain.Util, "(file: '%s', lineno: %s, function: %s)" % (tbextract[level+1][0], tbextract[level+1][1], tbextract[level+1][2]))
+            else:
+                 break
+            nexttb = tb.tb_next
+            level = level + 1
 
         raise