Continuous integration

This page describes various system performing automatic build verification for CRIU.

Travis CI

Travis CI is a free public service, it is well integrated with github.

To test CRIU with Travis CI, the Ubuntu 14.04 "trusty" VM is used, which has root access and an ability to run Docker containers.details.

With Travis CI, we do the following tests:

• check compilation on all supported platforms (x86_64, arm, aarch64, and power)
• do the same with CC=clang instead of gcc
• check compilation on Alpine Linux (x86_64 only)
• execute all tests that can work on the kernel available (ZDTM test suite and some other tests).
• collect code coverage and upload it to Coverall

For implementation details, see .travis.yml, scripts/travis/ and scripts/build/ in CRIU sources for details.

Patchwork

Patchwork is a web patch tracking system for projects using a mailing list for contributions and reviews.

In CRIU it is used to grab patch series from the mailing list, create a new git branch which is tested by Travis, and report success/failure back to the mailing list.

Non-x86 architectures

Travis CI only provides x86_64, so using other platforms is a bit tricky. We use Docker to get a container for a target platform, and a static build of qemu-user-$ARCH to run this container. As qemu-user-static is not available for Ubuntu 14.04, a script downloads it from Debian and extracts binaries.

Unfortunately, qemu-user functionality is limited (for example, strace syscall is not implemented), so we can't run any tests on these architectures.

Kernel testing

In addition to testing CRIU, we use Travis CI to test a few branches of the Linux kernel, to make sure recent changes does not break our precious software. We report found bugs to the kernel, and maintain a list of those bugs at Linux-next.

The process consists of "git clone" the kernel, compiling it, and using kexec to reboot to a new kernel. The catch is we have to use CRIU itself to checkpoint/restore the travis control process, so that the VM is not lost to Travis upon reboot. Please see this article for more details on the process.

To check the recent builds, see https://travis-ci.org/avagin/criu/branches (look for linux-next-daily branch).

Enable Travis CI for your repo

You can test your own criu repo with Travis (and it's highly recommended to check your changes before sending patches to the mailing list).

The setup is really easy, all you need to do is:

• Sign in to Travis CI, using your github account.
• Wait till Travis CI synchronizes your github repositories.
• Check your profile page and enable Travis CI for your CRIU repo.
• Create a new branch or push a new commit to github to trigger a build.

Mr Jenkins

We use Jenkins to execute tests. It works only for the criu upstream repo and isn't available to users yet. If you visit [1], you will find more than dozen jobs for different configurations. We try to test all criu features.

Most part of jobs uses ZDTM test suite. There each test is a small program. Each job plays different scenarios with these tests:

• dump/restore
• dump/restore a few times
• dump/restore with a freezer cgroup
• dump only
• pre-dump, dump/restore with or without page-server
• pre-dump with duplication
• fault injection
• collect code coverage

In addition, we execute our tests on linux-next to be sure that nobody breaks us in a kernel space.

Targets

CRIU project supports different hardware architectures and we test all of supported archs. This chapter describes targets used for CRIU testing.

• Virtuozzo virtual machine (x86_64, Fedora?)

• Fitlet (x86_64, Fedora 23)

• Raspberry Pi Model B Rev 2 (ARM, Raspbian)

• Virtual machine (PPC64el)

See also

• How to submit patches
• ZDTM test suite
• Linux-next

External links

• Travis
• Mr Jenkins
• Coveralls