[Scons-dev] Builder with custom decider and non-file based target

[Dirk Bächle]

Hi Oleg,

On 04.08.2016 13:55, Left Right wrote:
> Hello list.
>
> I'm trying to come up with a builder for Docker images. Docker images
> are built based on a Dockerfile template and a bunch of other sources
> one way or another related to the template. The output, however, isn't
> a file strictly speaking. The builder should combine two Docker
> operations: build+push, thus the final build artifact is the image
> residing in Docker registry (a server with it's own database,
> accessible via HTTP).
>
> What I'd like to accomplish is the following:
> 1. Create Docker Builder s.t. given the Dockerfile and other auxiliary
> files will call "docker build", then "docker push" to produce the
> build artifact and to put it in the Docker registry.
> 2. Prevent building images if a query to Docker registry for a
> previously built image succeeds.
>
> I'm now looking at target_factory of SCons.Builder, but I'm not sure
> this is the way to proceed. Please advise.
>

SCons works file-centric, meaning it expects that input and output to the single Builders (build steps) are actual files. So, as 
soon as you try to manage your images "proxy-wise" on a remote server you'll run into problems.
There is probably no easy workaround and you have to code the "remote" functionality in Python directly...

Best regards,

Dirk