changing BUILDPACK_URL doesn't update app configuration on heroku

[matthargett]

result:
after changing our BUILDPACK_URL in the heroku.yml, our heroku app was still using autodetect.

expected result:
heroku_san should either update the heroku configuration, or provide a warning message that the BUILDPACK_URL does not match the application, when deploying.

our heroku.yml:
production:
app: cases-render-service-prod
config:
NODE_ENV: production
BUILDPACK_URL: https://github.com/ddollar/heroku-buildpack-multi.git
staging:
app: cases-render-service-staging
config:
NODE_ENV: production
BUILDPACK_URL: https://github.com/ddollar/heroku-buildpack-multi.git

[kmayer]

When you run heroku config (NOT rake heroku config, use Heroku's CLI)
does the new URL show up? If not, did you run rake heroku config after
changing the url in the config file? Setting config vars is an "expensive"
API call to Heroku, so it is not done automatically by heroku_san. After
looking at Heroku's documentation for BUILDPACK_URL, it is just another
config var, so if it is set, it should work. They do mention that you must
specify a version in the url, too (
https://devcenter.heroku.com/articles/buildpacks#using-a-custom-buildpack).

On Tue, Feb 11, 2014 at 11:17 AM, Matt Hargett notifications@github.comwrote:

result:
after changing our BUILDPACK_URL in the heroku.yml, our heroku app was
still using autodetect.

expected result:
heroku_san should either update the heroku configuration, or provide a
warning message that the BUILDPACK_URL does not match the application, when
deploying.

our heroku.yml:
production:
app: cases-render-service-prod
config:
NODE_ENV: production
BUILDPACK_URL: https://github.com/ddollar/heroku-buildpack-multi.git
staging:
app: cases-render-service-staging
config:
NODE_ENV: production
BUILDPACK_URL: https://github.com/ddollar/heroku-buildpack-multi.git

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