Give instructions for creating an app from a local clone

[ncoghlan]

I set up a new project using this one as a template, but it took me a bit of thought to realise the right way to do a deployment based on that.

1. Push the imported sample code up to the source repo

2. Use that source repo in the deployment command rather than deploying directly from the local system:

   oc new-app python:3.5~https://github.com/ncoghlan/srpminfo.git

That way the deployed app is correctly associated with the relevant source repo.

[GrahamDumpleton]

To do it from a local clone only, without having your own fork on GitHub with the changes, entails using a binary build. The first steps for this are:

oc new-build python:3.5 --binary --name=srpminfo
oc start-build srpminfo --from-dir=.

Once the first build has completed, then run:

oc new-app srpminfo
oc expose sac srpminfo

After every code change you make and for which you want to do a build, you need to run again:

oc start-build srpminfo --from-dir=.

Because this is a binary build linked to your local checkout, you cannot use the start build button in the web console as it doesn't have access to the code files and the build will fail.

[ncoghlan]

The approach I've been taking is this:

• use a local virtualenv & python wsgi.py for dev iterations
• commit and do a proper deployment to update the cluster

I could do an intermediate step with oc cluster up to get a more complete deployment working locally, but the minimalist approach is actually working pretty well so far.

[ncoghlan]

That is, deployments are a matter of:

git commit -m "Whatever I changed"
git push
oc start-build srpminfo

And then the redeployment once the build finishes is automatic.