esp-open-rtos/utils/travis_tests/README.md

Travis CI Tests

This directory contains a script run_tests.sh that is executed by Travis CI. The script builds a test firmware, deploys it on one of the test servers and runs it.

The script will not return an error if deployment to one of the test servers has failed. It is done this way not to fail a build if a test server is down. The script will return an error if deployment was successful but tests failed.

Test servers

Test server is a linux host that is accessible from the Internet by a static IP. It should have at least one ESP8266 module connected to a USB port. The module should be capable restarting and switching to boot mode via a serial port. All popular NodeMCU and Wemos modules will work.

To run tests on a server it should provide SSH access. SSH daemon should be configured to authenticate using keys.

Test server running on Raspberry PI:

Test server requirements

• Linux host
• Public static IP
• One or two ESP8266 modules connected to USB ports
• SSH access from the Internet (with public key from Travis CI)
• Python3
• esptool.py installed pip install esptool
• pySerial python module pip3 install pyserial

Create SSH keys for Travis

Here is a good article about Travis deployment using SSH.

The problem with SSH access from Travis to a server is that it should have a private key. But this key should not be publicly available.

Hopefully Travis allows to encrypt certain files and only decrypt them at build stage. So the sensitive file is stored in the repository encrypted.

Generate a new key pair:

ssh-keygen -t rsa -b 4096 -C '<repo>@travis-ci.org' -f ./<server_name>_rsa

To encrypt a private key you need a command line Travis client.

To install it run:

gem install travis

Or refer the official installation instructions.

The following command will encrypt a file and modify .travis.yml:

travis encrypt-file <server_name>_rsa --add

Deploy public key to a test server:

ssh-copy-id -i <server_name>_rsa.pub <ssh-user>@<deploy-host>

Add the following lines in the .travis.yml:

addons:
  ssh_known_hosts: <server_ip>

before_install:
- openssl aes-256-cbc aes-256-cbc -K $encrypted_<...>_key -iv $encrypted_<...>_iv -in <server_name>_rsa.enc -out /tmp/<server_name>_rsa -d
- eval "$(ssh-agent -s)"
- chmod 600 /tmp/<server_name>_rsa
- ssh-add /tmp/<server_name>_rsa

Remove keys and stage files for commit:

rm -f <server_name>_rsa <server_name>_rsa.pub
git add <server_name>_rsa.enc .travis.yml

Add test server

The final step is to add a server to the test runner script. Add a new item into an array in run_tests.sh:

TEST_SERVERS[2]="IP=<server_ip>;User=<ssh_user_name>;Type=<solo|dual>"