[OE-core] can pkg_{pre, post}rm functions be run at all for image creation?

[Robert P. J. Day]

On Mon, 4 Aug 2014, Richard Purdie wrote:

> On Mon, 2014-08-04 at 09:42 -0400, Robert P. J. Day wrote:
> >   oooooh ... that's still kind of weaselly terminology. :-) i'm not
> > *trying* to be annoyingly pedantic, but this is just the kind of thing
> > that students tend to ask about, which is why i want to nail the
> > details.
> >
> >   the current docs state that pkg_*rm routines are *not* run during
> > image creation, and i'm going to accept that. that means that if a
> > pkg_*rm routine *is* written with reference to ${D}, as long as that's
> > run on the target, it won't make a difference. so the references to
> > ${D} in that context don't *hurt*, they're just unnecessary. and
> > potentially confusing, which is why i'm trying to clarify this. (every
> > pkg_*rm routine i've seen, *if* it tests the value of ${D}, bailed if
> > it was set, which makes sense if they should never, ever be invoked at
> > image creation time.)
>
> In the interests of being pedantic since I know you value correctness,
> they test $D. If they used ${D}, it would get expanded by bitbake at
> build time which is not what you want.
>
> >   WRT stuff run at rootfs postprocessing time, sure, you could always
> > run a package removal command, but clarify this for me -- once you're
> > into rootfs postprocessing, you're running in a "pseudo" environment
> > such that you are *effectively* running inside that rootfs, no? so in
> > that case, all filename references would be full names WRT to the root
> > filesystem -- no references to ${D}. is that correct? or am i just
> > confused?
>
> Pseudo environment means you can perform operations as root, its not a
> chroot. You could be in a pseudo chroot of course but our image
> generation isn't.

  ok, i think i've got it, thanks, both of you.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

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