As a part of my my customized travis build I would like to use Travis command-line client inside after_success script. I need that to trigger some operations on other travis jobs (other repositories) after each successfull build in this particular repo. So two questions:
As far as I know Travis Cli has several ruby dependencies that may not be available by default. But perhaps it is by default installed on travis VMs.
Yes, this is completely possible. However, this would only work for language: ruby jobs.
For your specific case, you can do:
after_success:
# install travis cli
- gem install --no-document travis
# setup travis shell autocomplete
- echo "y" | travis --version
# do travis cli stuff
- travis do stuff
If you have a project using another language, then this becomes much more complicated.