[pcp] [Bug 1287778] New: Python PMAPI pmNonOptionsFromList cryptic error message

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1287778

            Bug ID: 1287778
           Summary: Python PMAPI pmNonOptionsFromList cryptic error
                    message
           Product: Fedora
           Version: 23
         Component: pcp
          Assignee: nathans at redhat.com
          Reporter: myllynen at redhat.com
        QA Contact: extras-qa at fedoraproject.org
                CC: brolley at redhat.com, fche at redhat.com, lberk at redhat.com,
                    mgoodwin at redhat.com, nathans at redhat.com,
                    pcp at kenj.com.au, scox at redhat.com



Description of problem:
pmNonOptionsFromList() can fail without really telling why:

localhost:~> cat ./test.py
#!/usr/bin/python

from pcp import pmapi
import sys

opts = pmapi.pmOptions()
print opts.pmNonOptionsFromList(sys.argv)
ctx = pmapi.pmContext.fromOptions(opts, sys.argv)
localhost:~> python ./test.py abc  
Traceback (most recent call last):
  File "./test.py", line 7, in <module>
    print opts.pmNonOptionsFromList(sys.argv)
  File "/usr/lib64/python2.7/site-packages/pcp/pmapi.py", line 792, in
pmNonOptionsFromList
    return c_api.pmGetNonOptionsFromList(argv)
SystemError: error return without exception set
localhost:~> 

If we create the context before calling pmNonOptionsFromList() then it works as
expected. Ideally the above would work also as e.g. in pmrep(1) we need to read
non-options which include references to configuration file entries which will
then in turn be used in context creation.

Thanks.

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