Introducing chroot tasks

[Ben Brenson <benbrenson89@googlemail.com>]

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Hi,

I want to submit some patches for defining and running chroot tasks within 
bitbake recipes.
The following short example should show what I mean:

Exampe recipe.bb:

do_foo() {
    # Do something within chroot
}
do_foo[chroot] = "1"
do_foo[id] = "${BUILDCHROOT_ID}"
addtask do_foo after ... before ... 


By setting the chroot flag the task automatically will be executed within 
the chroot specified by the id flag.
My isar (https://github.com/benbrenson/isar) fork already supports this 
feature, by using schroot.

This will give much more flexibility and modularity to Isar. You will be 
able to append/prepend things to those tasks
between layers easily.

I have already seen, that there is another and better approach than schroot 
-> proot.
I saw Alexander has already experimented with this feature, which seems to 
work.

So before posting some patches here, maybe changing this feature to proot 
first would a better first-step?


Regards,
Benedikt

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