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Date: Sat, 2 Aug 2014 13:09:59 -0700
From: Khem Raj <raj.khem@gmail.com>
To: "Robert P. J. Day" <rpjday@crashcourse.ca>
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Subject: Re: can pkg_{pre, post}rm functions be run at all for image creation?
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On 14-08-02 15:57:00, Robert P. J. Day wrote:
> On Sat, 2 Aug 2014, Khem Raj wrote:
> 
> > On Sat, Aug 2, 2014 at 9:34 AM, Robert P. J. Day <rpjday@crashcourse.ca> wrote:
> > > say, pkg_prerm() functions would never be written with respect to the
> > > variable ${D}, which would be relevant only during image creation. but
> > > i can see things like this in sysklogd.inc:
> > >
> > > pkg_prerm_${PN} () {
> > >         if test "x$D" = "x"; then
> >
> > note that its not ${D} (bitbake context) but $D which is evaluated
> > in the context when the script is run.
> 
>   i still don't understand ... what are the possible values of $D
> here, and what would they represent?

At build time it will not be expanded by bitbake like ${D} is. but
during image creation it will be. But when doing on-device install of
this package $D will be empty. Its a way to differentiate actions during
image creation and on-device install/update/remove

-Khem