occlum/demos/linux-ltp

Run Linux LTP on Occlum

In this demo, we will show how to run the Linux LTP inside Occlum.

Linux LTP is the most popular test suite for Linux. Occlum could also apply the LTP to verify the stability and compatibility to Linux app.

Because Occlum doesn't support fork, vfork has to be used instead in the LTP test. And a light weight test script running in Occlum is provided to be used in this demo.

Download and build the Linux LTP from source code

./dl_and_build_ltp.sh

Some test cases are failed due to multiple reasons, such as syscall is not implemented or not completely implemented in Occlum.

• Some default LTP test cases may make the Occlum crash or hang (Only checked the cases in syscalls for now).
• Occlum runable syscall test cases are defined in syscalls-occlum. It may be updated with Occlum development.

The original [syscalls] test cases could be found in the built demo occlum_instance/image/opt/ltp/runtest/syscalls. Panic/Sefault/hang testcases could be listed by a simple diff for these two files.

Prepare the Occlum instance for LTP demo

./prepare_ltp.sh

Run the LTP demo

The script run-ltp.sh supports two optional arguments as below.

    usage: run-ltp.sh [options]

    options:
    -f CMDFILES     Execute user defined list of testcases
    -s PATTERN      Only run test cases which match PATTERN.

    example: run-ltp.sh -f syscalls-occlum -s timerfd

To run in Occlum, use the following command.

occlum run /opt/ltp/run-ltp.sh -f syscalls-occlum -s timerfd

If no options provided, all the test cases in default LTP syscalls will be run one by one.

Note:

• The CMDFILES are defined in the LTP install path, such as occlum_instance/image/opt/ltp/runtest/ in this demo.