Write script to push dependency update proposals to each project when common dependency list changes

[Monty Taylor]

When we change the common requirements, it's entirely easy to create commits that run the depend sync script and create code reviews for it to the other projects.

[Clark Boylan (cboylan)]

openstack/requirements is now a thing with traction. We can now start automagically proposing updates to projects when the common requirements update. This should happen as a post job for the openstack/requirements repo.

[Susan Tan (susan-tan-fleckerl)]

Hi,

I'm a new beginner (volunteer) contributor to Open Stack looking at easy-picking tickets and this one is an interesting ticket. I have devstack installed and running locally on a Vagrant VM; I've just cloned the requirements repo and have carefully read the update.py file inside that repo.

I have a few beginner-type questions:
1) Should I be making the code patch directly in update.py? Is this the right file to make the code changes? If not, then, are you expecting a ".sh" bash script file to be added into the requirements repo?
2) The update.py file takes in only 1 argument, the directory path. Should the new script automatically find the directory path to the relevant open stack repos (such as the nova repo, cinder repo, glance repo, etc)?
3) What is a "post job"? Do you mean a "cron job" that runs a new script relying on update.py every so often?

[Jeremy Stanley (fungi)]

This is actually already underway in https://review.openstack.org/40068 but should provide a good example of what this bug was suggesting.