[PATCH 4/8] Add new command "show-config" to initctl.

[James Hunt]

Add "show-config" command to initctl.

* util/initctl.c:
  - New functions:
    - job_class_condition_handler(): Handler function to retrieve job
conditions.
    - job_class_condition_err_handler(): Handler error function for
      job_class_condition_handler().
    - job_class_parse_events(): Convert RPN "start on" and "stop on"
conditions to
      human-readable format.
    - job_class_show_emits(): Display events which job emits.
    - job_class_show_conditions(): Make D-Bus calls to retrieve "start
on" and
      "stop on" conditions.
    - show_config_action: Handle "show-config" command..
* util/initctl.h: New file providing stack-handling functionality for
  RPN parsing for "show-config" command.
* util/Makefile.am: Added initctl.h to initctl_SOURCES.
* util/man/initctl.8: Updated for "show-config" command and associated
  options.
* util/tests/test_initctl.c:
  - New macros START_UPSTART, STOP_UPSTART, RUN_COMMAND, CREATE_FILE and
DELETE_FILE.
    These are required since due to the introduction of the
    "show-config" initctl command, initctl is no longer solely a proxy
    to Upstart: it now has some intelligence (it parses the
    "emits", "start on" and "stop on" conditions) and thus must be
    tested directly.
  - test_show_config(): New function to test "initctl show-config".
  - in_chroot(): New function to detect if tests are being run from
    within a chroot environment.
  - dbus_configured(): New function which performs a basic check to
    establish if D-Bus is configured correctly.
  - main(): Added call to test_show_config(), conditional on
    a non-chroot environment and a working D-Bus system.

Code:

https://code.launchpad.net/~jamesodhunt/upstart/upstream-initctl-show-config

Merge Proposal:

https://code.launchpad.net/~jamesodhunt/upstart/upstream-initctl-show-config/+merge/63348


Regards,

James.