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Add automated tests for packages/driver installs
Add automated tests for running falco from a package and container. As a result, this will also test building the kernel module as well as runnning falco-probe-loader as a backup. In travis.yml, switch to the docker-enabled vm and install dkms. This changed the environment slightly, so change how avocado's python dependencies are installed. After building falco, copy the .deb package to docker/local and build a local docker image based on that package. Add the following new tests: - docker_package: this uses "docker run" to run the image created in travis.yml. This includes using dkms to build the kernel module and load it. In addition, the conf directory is mounted to /host/conf, the rules directory is mounted to /host/rules, and the traces directory is mounted to /host/traces. - docker_package_local_driver: this disables dkms via a volume mount that maps /dev/null to /usr/sbin/dkms and copies the kernel module by hand into the container to /root/.sysdig/falco-probe-....ko. As a result, falco-probe-loader will use the local kernel module instead of building one itself. - debian_package: this installs the .deb package and runs the installed version of falco. Ideally, there'd also be a test for downloading the driver, but since the driver depends on the kernel as well as the falco version string, you can't put a single driver on download.draios.com that will work long-term. These tests depend on the following new test attributes: - package: if present, this points to the docker image/debian package to install. - addl_docker_run_args: if present, will be added to the docker run command. - copy_local_driver: if present, will copy the built kernel module to ~/.sysdig. ~/.sysdig/* is always cleared out before each test. - run_duration: maps to falco's -M <secs> flag - trace_file is now optional. Also add some misc general test changes: - Clean up our use of process.run. By default it will fail a test if the run program returns non-zero, so we don't have to grab the exit status. In addition, get rid of sudo in the command lines and use the sudo attribute instead. - Fix some tests that were writing to files below /tmp/falco_outputs by creating the directory first. Useful when running avocado directly.
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