AttributeError: 'Colorizer' object has no attribute 'header_'

[Daniel Manrique]

WHen running a job with a requirement on a non-existent resource, I get a crash and trace ending in:

  File "/src/checkbox/bzr/trunk/plainbox/plainbox/impl/commands/run.py", line 894, in _update_desired_job_list
    print(self.C.header_("Warning", 'YELLOW'))
AttributeError: 'Colorizer' object has no attribute 'header_'

How to reproduce:

- mk-venv your checkbox tree and develop it.
- Create a something.txt file in the checkbox provider's jobs directory
- Add this job (note the bogus resource in the requirement):

id: roadmr
plugin: shell
command: none
requires: 'ka' in bogusinfo.platform
_description: test

Run the job:

run -i 2013.com.canonical.certification::roadmr

Expected result:
- A warning about non-existent resource, but no crash

Actual result:
- Crash ending as seen above.

This patch fixes it (but it may not be the correct solution):

=== modified file 'plainbox/plainbox/impl/commands/run.py'
--- plainbox/plainbox/impl/commands/run.py 2014-08-04 16:51:44 +0000
+++ plainbox/plainbox/impl/commands/run.py 2014-08-07 17:35:37 +0000
@@ -891,7 +891,7 @@
     def _update_desired_job_list(self, desired_job_list):
         problem_list = self.state.update_desired_job_list(desired_job_list)
         if problem_list:
- print(self.C.header_("Warning", 'YELLOW'))
+ print(self.C.header(_("Warning"), 'YELLOW'))
             print(_("There were some problems with the selected jobs"))
             for problem in problem_list:
                 print(" * {}".format(problem))

With that, running the job results in this:

===============================[ Analyzing Jobs ]===============================
==================================[ Warning ]===================================
There were some problems with the selected jobs
 * missing dependency: '2013.com.canonical.certification::bogusinfo' (resource)
Problematic jobs will not be considered
=============================[ Session Statistics ]=============================
This session is about 0.00% complete
Estimated duration cannot be determined for automated jobs.
Estimated duration cannot be determined for manual jobs.
Size of the desired job list: 0
Size of the effective execution plan: 0
===========================[ Running Selected Jobs ]============================
==================================[ Results ]===================================

The problem was introduced as a small mistake in commit 3038 (2014-05-29), in a sub-commit that reads "use C.header() for all headers".