*single* edeliver command to build and "hot upgrade" a Elixir/Phoenix App?

[nelsonic]

#as part of using Travis to Continuously Deploy our Elixir Apps using Travis-CI
we are on a quest to find a single command that we can run when a build passes

mix edeliver build upgrade --auto-version=git-revision --from=$(git rev-parse HEAD~) --verbose 
mix edeliver deploy upgrade to production --version=$(git rev-parse HEAD~) --verbose

relates to / depends on: #53
... we want to curl app.net/_version instead of reading it from
required by: dwyl/learn-travis#22

Todo

• keep investigating until we find the magic command to "hot upgrade" an Elixir app! 🔍
• Use latest available version of the app when deploying

I've read through all the docs https://github.com/edeliver/edeliver
& wiki https://github.com/edeliver/edeliver/wiki without any luck.
This looks like a good place to continue the quest:
http://www.east5th.co/blog/2017/01/23/upgrade-releases-with-edeliver/

Right now the process requires human intervention to manually type/input the version:

Also, it doesn't help that my internet connection keeps timing out because people are clearly using it for (non-work related) streaming ...!

[nelsonic]

Use the git revision that is currently in "production": curl http://213.168.248.157/_version

mix edeliver build upgrade --auto-version=git-revision --from=$(curl http://213.168.248.157/_version) --verbose 

However when I attempt to upload the release to the server using the command:

mix edeliver deploy upgrade to production

I get the following error:

A remote command failed on:

  ubuntu@213.168.248.157

Output of the command is shown above if the --verbose option
was used and the commands executed on that remote host are
printed below for debugging purposes:

FAILED with exit status 3:

ssh -o ConnectTimeout=3 ubuntu@213.168.248.157 
    [ -f ~/.profile ] && source ~/.profile
    set -e
    cd /home/ubuntu/hello_world_edeliver &> /dev/null
    bin/hello_world_edeliver upgrade 0.0.3+f012e96 &> /dev/null
   &> /dev/null