Re: [Pyobjc-dev] Calling SMJobBless with valid AuthorizationRef

[Michael M. <mic...@gm...>]

Hi Kunal, I recently wrote some code to call SMJobBless and SMJobRemove
using only ctypes.
This was lots of boilerplate but works reliably.
It's GPL, so you can see the code here:
http://bazaar.launchpad.net/~ubuntuone-control-tower/ubuntuone-control-panel/trunk/view/head:/ubuntuone/controlpanel/utils/darwin.py

Please feel free to ask me if you have any questions.

-mike


On Mon, Nov 5, 2012 at 1:56 AM, Ronald Oussoren <ron...@ma...>wrote:

>
> On 5 Nov, 2012, at 2:59, Kunal Parmar <kun...@gm...> wrote:
>
> > I'm getting an error when calling SMJobBless - "ValueError:
> depythonifying 'pointer', got 'LP_c_void_p'". I've tried a few things
> without luck. Any help will be appreciated.
>
> It's currently not easily possible to use ctypes with PyObjC, I've filed
> an issue in my bitbucket about adding ctypes support to pyobjc <
> https://bitbucket.org/ronaldoussoren/pyobjc/issue/23/add-ctypes-support>.
>
> Anoyingly the Security framework is not easily wrapped using the normal
> PyObjC mechanism's either, in particular support for C structs that contain
> pointers is lacking right now. I'll have to experiment a little to see if I
> can get your example to work properly using some other hacks.
>
> Ronald
>
>
> >
> > Here's my code -
> >
> > from ServiceManagement import (
> >     kSMDomainSystemLaunchd,
> >     SMJobBless,
> > )
> >
> > security = ctypes.cdll.LoadLibrary(ctypes.util.find_library('Security'))
> >
> > class AuthorizationItem(ctypes.Structure):
> >     _fields_ = [
> >         ('name', ctypes.c_char_p),
> >         ('valueLength', ctypes.c_uint32),
> >         ('value', ctypes.c_void_p),
> >         ('flags', ctypes.c_uint32),
> >     ]
> >
> > class AuthorizationRights(ctypes.Structure):
> >     _fields_ = [
> >         ('count', ctypes.c_uint32),
> >         ('items', ctypes.POINTER(AuthorizationItem)),
> >     ]
> >
> > authorization_item = AuthorizationItem(
> >     name='com.apple.ServiceManagement.blesshelper',
> >     valueLength=0,
> >     value=None,
> >     flags=0,
> > )
> > authorization_rights = AuthorizationRights(
> >     count=1,
> >     items=ctypes.pointer(authorization_item),
> > )
> > authorization_flags = 19
> > authorization_ref = ctypes.POINTER(ctypes.c_void_p)()
> > status = security.AuthorizationCreate(
> >     ctypes.pointer(authorization_rights),
> >     None,
> >     authorization_flags,
> >     ctypes.pointer(authorization_ref),
> > )
> > SMJobBless(
> >     kSMDomainSystemLaunchd,
> >     'app.helper',
> >     authorization_ref,
> >     None,
> > )
> >
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