correct error reporting on python text compilation

The exception raised in the BPF class constructor assumed
that the "src_file" argument was used to pass eBPF code -
this is not the case for many of the tools scripts, which
tend to use "text".

Signed-off-by: Nathan Scott <[email protected]>

src/python/bcc/__init__.py

@@ -287,6 +287,8 @@ def __init__(self, src_file="", hdr_file="", text=None, cb=None, debug=0,
  if text:
  self.module = lib.bpf_module_create_c_from_string(text.encode("ascii"),
  self.debug, cflags_array, len(cflags_array))
+ if not self.module:
+ raise Exception("Failed to compile BPF text:\n%s" % text)
  else:
  src_file = BPF._find_file(src_file)
  hdr_file = BPF._find_file(hdr_file)
@@ -296,9 +298,8 @@ def __init__(self, src_file="", hdr_file="", text=None, cb=None, debug=0,
  else:
  self.module = lib.bpf_module_create_c(src_file.encode("ascii"),
  self.debug, cflags_array, len(cflags_array))
-
- if not self.module:
- raise Exception("Failed to compile BPF module %s" % src_file)
+ if not self.module:
+ raise Exception("Failed to compile BPF module %s" % src_file)
 
  for usdt_context in usdt_contexts:
  usdt_context.attach_uprobes(self)