Extend continuous integration tests by adding testing against various kernel
versions.
The code is based on vmtest CI scripts implemented by osandov@
for drgn [1] with the following modifications:
- The downloadables are stored in Amazon S3 cloud indexed in [2]
- `--setup-cmd` command line option is added to vmtest/run.sh so
setup commands run on VM boot can be set in e.g. `.travis.yml`
- Travis build matrix [2] is introduced for VM tests so VM tests are
followed by the existing CI tests. The matrix has `KERNEL` and
`VMTEST_SETUPCMD` dimensions.
- Minor style fixes.
The vmtest extention code is located in travis-ci/vmtest and contains
`run.sh` and `setup_example.sh`
- `run.sh` is responsible for the vmtest workflow: downloading vmlinux
and rootfs image from the cloud, fs mounting, syncing libbpf sources
to the image, setting up scripts run on VM boot, starting VM using
QEMU.
`run.sh` covers more use cases than a script for a job run in TravisCI,
e.g. int can build a kernel w/ `--build` option.
- `setup_example.sh` is an example of a script run in VM which can be
modified to e.g. run actual libbpf tests. A setup script should have
executable permission.
To set up a new kernel version for a test:
1) upload vmlinuz.* and vmlinux.*\.zst to Amazon S3 store
located at [4];
2) modify INDEX [2] file.
[1] https://github.com/osandov/drgn
[2] https://libbpf-vmtest.s3-us-west-1.amazonaws.com/x86_64/INDEX
[3] https://docs.travis-ci.com/user/build-matrix
[4] https://libbpf-vmtest.s3-us-west-1.amazonaws.com/
The main reason why this is necessary is that gcc 5.x on Xenial doesn't
support ASan on s390x. Bumping the release to Bionic with gcc 7.x allows
us to build libbpf on s390x with ASan without issues.
In order to libbpf to be used in systemd some testing is required, see related
discussions in https://github.com/systemd/systemd/pull/12151 and
https://github.com/libbpf/libbpf/pull/29
The tests introduced here mirrors the tests of systemd:
For Debian: build with gcc, gcc + asan, clang, clang + asan
Debian tests use `docker` virtualization
Fror Ubuntu Xenial: build with gcc
The differences:
Install only libelf and it's dependencies.
Instead of Meson build system `make` is used, so `make` remains the preferred
method of building and `meson.build` doesn't get rooted in `libbpf`.
`travis_wait.bash` is kept as a workaround for
https://github.com/travis-ci/travis-ci/issues/9979
An example of testing UI: https://travis-ci.org/wat-ze-hex/libbpf
