[OE-core] opkg pkg_prerm on package update

[Burton, Ross]

On 22 January 2016 at 09:50, Andreas Müller <schnitzeltony at googlemail.com>
wrote:

> although opkg 0.2 -> 0.3 is long ago I noticed a change in behaviour
> when updating a package:
>
> * 0.2.x did not call pkg_prerm
> * 0.3.x calls pkg_prerm
>
> Is calling pkg_prerm a valid behaviour when updating a package?
>

opkg is copying what dpkg does [1], which makes sense considering opkg is
basically a dpkg clone.  It passes variables to the script so you can
identify if the context is "i'm being deleted" or "i'm being upgraded".

This changed in
http://git.yoctoproject.org/cgit/cgit.cgi/opkg/commit/?id=a8555d352d2851ee1482b74b57ba9eacfb354c18
if you want more context.

[1] https://www.debian.org/doc/debian-policy/ch-maintainerscripts.html is
what dpkg does, fwiw.

Ross
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