I ran into a bunch of trouble over the past few days trying to get codeship.io to deploy a Go app I was playing around with. To save you some debugging time, I found that the appcfg.py codeship uses deploying App Engine Apps (at least the Go app I was using) is incorrectly coming from the Python bundle of GAE utitilies, not the Go bundle. This can result in unexpected dependency errors like:

 --- begin server output ---
 Compile failed:
 2014/10/13 21:59:55 go-app-builder: build timing: 16g (38ms total), 0gopack (0 total), 06l (0 total)
 2014/10/13 21:59:55 go-app-builder: failed running 6g: exit status 1
 main.go:8: can't find import: "github.com/gorilla/mux"
 --- end server output ---
 04:59 AM Rolling back the update.
 Error 422: --- begin server output ---
 --- end server output ---

The fix here is pretty easy. Add a line like export PATH=/home/rof/appengine/go_appengine:$PATH to your Setup Commands via the Settings page. If you ssh into your debug box (which is a really cool feature) you’ll see that $PATH lists the python_appengine folder first, which means the appcfg.py from that folder will take precedence over any others like the second one which is better suited for Go.

Overall, the UI that codeship provides is really nice and I liked the thought of not having to configure my deployment commands but in practice that didn’t work our very well. It would have been useful if their documentation was a bit more transparent what went into the “Updating your Google App Engine application” step. Now to sort out why codeship is trying to healthcheck the non-existent root URL of my application…