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Avoid parent process if no log redirection is used #3624

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Avoid parent process if no log redirection is used #3624

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mback2k
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@mback2k mback2k commented May 23, 2024 •
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What type of PR is this?

/kind design

What this PR does / why we need it:

Exec the command without forking in case go-runner does not need to perform log output redirection.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

Not sure if this is a desired change, please review and decide if generally useful or not. Thanks!

Does this PR introduce a user-facing change?

Yes

Avoid parent go-runner process if no log redirection is used, action required: may impact process-based monitoring solutions.

@k8s-ci-robot k8s-ci-robot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. release-note-action-required Denotes a PR that introduces potentially breaking changes that require user action. kind/design Categorizes issue or PR as related to design. labels May 23, 2024
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linux-foundation-easycla bot commented May 23, 2024 •
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CLA Signed

The committers listed above are authorized under a signed CLA.

  • ✅ login: mback2k / name: Marc Hörsken (2e7e2d8)

@k8s-ci-robot k8s-ci-robot added cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. needs-priority area/release-eng Issues or PRs related to the Release Engineering subproject sig/release Categorizes an issue or PR as relevant to SIG Release. labels May 23, 2024
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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mback2k
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Welcome @mback2k!

It looks like this is your first PR to kubernetes/release 🎉. Please refer to our pull request process documentation to help your PR have a smooth ride to approval.

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@k8s-ci-robot k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label May 23, 2024
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Hi @mback2k. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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@k8s-ci-robot k8s-ci-robot added size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. and removed cncf-cla: no Indicates the PR's author has not signed the CNCF CLA. labels May 23, 2024
@mback2k
Avoid parent process if no log redirection is used
2e7e2d8 
Exec the command without forking in case go-runner
does not need to perform log output redirection.

Signed-off-by: Marc Hoersken <[email protected]>
@mback2k mback2k marked this pull request as ready for review May 23, 2024 18:47
@k8s-ci-robot k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label May 23, 2024
saschagrunert
saschagrunert reviewed May 28, 2024
View reviewed changes
images/build/go-runner/go-runner.go
@@ -79,7 +80,11 @@ func configureAndRun() error {
cmd.Stderr = errStream

log.Printf("Running command:\n%v", cmdInfo(cmd))
err := cmd.Start()
if cmd.Stdout == os.Stdout && cmd.Stderr == os.Stderr {
err = syscall.Exec(cmd.Path, cmd.Args, syscall.Environ())
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Hm, this feels like a potentially breaking change. Shall we make it an optional feature or such?

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I agree, but the idea was to automatically/intelligently save systems resources by avoiding the parent process (go-runner) if not needed. What do you think about an opt-out argument/flag?

@xmudrii
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xmudrii commented May 28, 2024

@mback2k Thank your for the contribution! I agree with @saschagrunert that this should probably be an option. Additionally, can you please clarify (e.g. in the PR description) why do you think this change is needed and what do we get from it?

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/lifecycle stale

@k8s-ci-robot k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Sep 1, 2024
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