"qm-oom-score-adj" added: extract the last line of the output

[pengshanyu]

When retrieving QM_PID and QM_FFI_PID, extract the last line of the output to enhance code robustness.
Resolve errors that occur when warning messages appear in the output. For example:

# podman exec -it qm bash -c "podman ps"
WARN[0000] The storage 'driver' option should be set in /etc/containers/storage.conf. A driver was picked automatically. 
WARN[0000] The storage 'driver' option should be set in /etc/containers/storage.conf. A driver was picked automatically. 
CONTAINER ID  IMAGE                                           COMMAND         CREATED      STATUS      PORTS       NAMES
3609c06fda3c  quay.io/centos-sig-automotive/ffi-tools:latest  sleep infinity  2 hours ago  Up 2 hours              ffi-qm

Summary by Sourcery

Enhancements:

• Add tail -1 when parsing podman inspect outputs and /proc/*/oom_score_adj reads to skip warning lines and improve robustness

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Modify all retrieval steps for PIDs, statuses, and file contents to pipe through tail -1 before trimming control characters, ensuring only the last line of actual data is captured despite any preceding warnings.

File-Level Changes

Change	Details	Files
Enforce extraction of the last line in outputs before trimming to avoid preceding warning noise	Pipe podman inspect PID retrieval in get_pid_with_retries through tail -1 Use tail -1 on /proc/* file reads in get_oom_score_adj Insert tail -1 into QM_FFI_STATUS inspection pipeline Insert tail -1 into QM_FFI_PID inspection pipeline	tests/ffi/qm-oom-score-adj/test.sh

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[gemini-code-assist]

Summary of Changes

Hello @pengshanyu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the robustness of shell scripts by ensuring that command outputs are correctly parsed, specifically when retrieving process IDs (PIDs), container statuses, and OOM score adjustments. By filtering command output to only the last line, the changes prevent unexpected warning messages from interfering with subsequent script logic, making the scripts more resilient to variations in command-line tool behavior.

Highlights

• Robust PID and Status Retrieval: Modified commands that retrieve QM_PID, QM_FFI_PID, and QM_FFI_STATUS to extract only the last line of their output. This prevents issues when podman or other commands emit warning messages before the actual desired output, ensuring that only the relevant data (like PIDs or container status) is captured.
• OOM Score Adjustment Reading: Applied the same tail -1 logic when reading the oom_score_adj value from /proc/$pid/oom_score_adj. This ensures that any potential extraneous output from cat or similar commands does not interfere with reading the numerical value.

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[gemini-code-assist]

Code Review

This pull request aims to make shell commands more robust by taking the last line of output, which is a good goal. However, the current implementation might not work as expected if warnings are printed to stderr, and it relies on TTY behavior for podman exec. I've provided suggestions to use 2>&1 to explicitly redirect stderr to stdout, which is a more robust and standard way to handle this. This also allows removing -it flags and tr commands, making the code cleaner. I've also pointed out a case where tail -1 is not necessary.

[Yarboa]

Consider moving this
podman inspect "$container_name" --format '{{.State.Pid}}' 2>&1 | tail -1
To a method, with 2 args, ctr_name format,

It could save the fix in 3 places

[pengshanyu]

Hi @Yarboa ,
Your suggestion is great. Thank you so much for the review.
Done.

[pengshanyu]

Hi @Yarboa , could you help to review it again, thanks.

[Yarboa]

WARN[0000] The storage 'driver' option should be set in /etc/containers/storage.conf.

when did that happen, the warnings?
Maybe it is better to understand what is missing

[pengshanyu]

Sure, I ping you the details.