Re: [Qemu-devel] [RFC PATCH 2/2] add debian-bootstrap.docker target

[Fam Zheng <famz@redhat.com>]

On Tue, 05/31 16:27, Alex Bennée wrote:
> 
> Fam Zheng <famz@redhat.com> writes:
> 
> > On Thu, 05/26 15:27, Alex Bennée wrote:
> >> Together with some changes to the docker script you can now build an
> >> arbitrary architecture of Debian using debootstrap. To achieve this I
> >> introduce the concept of a HOST_CMD in the docker config file. While
> >> copying the file into workspace the HOST_CMD is run in the docker build
> >> context. This allows debootstrap to set up its first stage before the
> >> container is built.
> >
> > Could you instead introduce the concept of $IMAGE.pre file (in this case
> > debian-bootstrap.pre, aside debian-bootstrap.docker), and exec it in
> > docker.py?  It would be much more flexible, and we we wouldn't need to inject a
> > custom directive to filter it out.
> 
> I'm ambivalent about that. To be honest this is a bit of a gap in
> docker's image creation (or if there is a better more docker-y way of
> doing things I couldn't find it). It does have the benefit of keeping
> everything in one place.

I don't like that it pollutes the dockerfile, rendering it invalid for raw
"docker build", which is not very good.

> 
> We are copying the dockerfile to the build environment anyway so it
> seemed natural to do the operation while copying across. How would
> envison the .pre setup? A #! script we just exec inside the temp
> directory we create?

Yes, since I'm going to send a v7, I'll merge the tmp dir part in to my series,
and add a new patch for the "pre" idea to see if we like it.

Fam