[openstack-dev] [higgins] Docker-compose support

Joshua Harlow harlowja at fastmail.com
Tue May 31 19:02:01 UTC 2016

Cool good to know,

I see 

Would that be the primary API? Hard to tell what is the API there 
actually, haha. Is it the run() method?

I was thinking more along the line that higgins could be a 'interpreter' 
of the same docker-compose format (or similar format); if the library 
that is being created takes a docker-compose file and turns it into a 
'intermediate' version/format that'd be cool. The compiled version would 
then be 'executable' (and introspectable to) by say higgins (which could 
say traverse over that intermediate version and activate its own code to 
turn the intermediate versions primitives into reality), or a 
docker-compose service could or ...

Libcompose also seems to be targeted at a higher level library, from at 
least reading the summary, neither seem to be taking a compose yaml 
file, turning it into a intermediate format, exposing that intermediate 
format to others for introspection/execution (and also likely providing 
a default execution engine that understands that format) but instead 
both just provide an equivalent of:

   project = make_project(yaml_file)

Which probably isn't the best API for something like a web-service that 
uses that same library to have. IMHO having a long running run() method 
exposed, without the necessary state tracking, ability to 
interrupt/pause/resume that run() method and such is not going to end 
well for users of that lib (especially a web-service that needs to 
periodically be `service webservice stop` or restart, or ...).

Denis Makogon wrote:
> Hello Stackers.
> As part of discussions around what Higgins is and what its mission there
> are were couple of you who mentioned docker-compose [1] and necessity of
> doing the same thing for Higgins but from scratch.
> I don't think that going that direction is the best way to spend
> development cycles. So, that's why i ask you to take a look at recent
> patchset submitted to docker-compose upstream [2] that makes this tool
> (initially designed as CLI) to become a library with Python API.  The
> whole idea is to make docker-compose look similar to libcompose [3]
> (written on Go).
> If we need to utilize docker-compose features in Higgins i'd recommend
> to work on this with Docker community and convince them to land that
> patch to upstream.
> If you have any questions, please let me know.
> [1] https://docs.docker.com/compose/
> [2] https://github.com/docker/compose/pull/3535
> [3] https://github.com/docker/libcompose
> Kind regards,
> Denys Makogon
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