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Remotely debugging Travis CI
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travis-debug.md

This is a method of using ngrok to live-debug a Travis CI build.

(This is from some terse notes I took while working on staticx and hasn't been re-verified.)

Add to .travis.yml:

env:
  NGROK_TOKEN=...

addons:
  apt:
    packages:
      - ssh 

after_script:
  - ./run_ngrok.sh

Here's run_ngrok.sh:

#!/bin/bash

curl -o ngrok.zip https://bin.equinox.io/c/4VmDzA7iaHb/ngrok-stable-linux-amd64.zip || exit $?
unzip ngrok.zip || exit $?
chmod +x ngrok

echo "ssh-rsa $YOUR_SSH_PUBLIC_KEY_GOES_HERE" > ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
echo "Starting sshd..."
sudo systemctl start sshd || exit $?

echo "Starting ngrok..."
./ngrok tcp 22 --authtoken=$NGROK_TOKEN --log=stdout --log-level=debug
echo "ngrok exited $?"

Then:

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