[packagekit] [RFC] Move common python spawning functions to pk-python-backend.[hc]

[James Bowes]

Hi all:

Attached is a patch series that:

- takes the standard backend_foo functions from pk-backend-bar and
moves them to
  src/pk-python-backend.[hc]
- updates yum, smart, conary and pisi to use these rather than redeclaring them.

Diffstat:

 backends/conary/helpers/conaryBackend.py |    4 +
 backends/conary/pk-backend-conary.c      |  153 +---------------
 backends/pisi/pk-backend-pisi.c          |  114 +-----------
 backends/smart/pk-backend-smart.c        |   47 +-----
 backends/yum/pk-backend-yum.c            |  283 +++---------------------------
 src/Makefile.am                          |    5 +-
 src/pk-python-backend.c                  |  259 +++++++++++++++++++++++++++
 src/pk-python-backend.h                  |   94 ++++++++++
 8 files changed, 403 insertions(+), 556 deletions(-)

Backend authors, please check to make sure I haven't broken you :)

-James
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