feat: add func logs command to stream function logs

[Itx-Psycho0]

This PR implements the func logs command requested in issue #3521.

The command provides a simple way to stream logs from deployed functions without needing to know the underlying service name or pod details.

Usage examples:

• Stream logs from current directory: func logs
• Stream logs by name: func logs --name my-function
• Filter by time: func logs --since 5m
• Custom namespace: func logs --namespace my-ns

Implementation details:

• Uses the existing GetKServiceLogs functionality from the knative package
• Supports graceful shutdown with Ctrl+C
• Includes comprehensive tests
• All tests and linting checks pass

The command is added to the Development Commands group alongside run, invoke, and build commands.

Fixes #3521

[knative-prow]

Hi @Itx-Psycho0. Thanks for your PR.

I'm waiting for a knative 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Itx-Psycho0]

Hi @lkingland @jrangelramos,

I've implemented the func logs command as discussed in this issue. The implementation uses the Kubernetes logs API approach as suggested by @srikaryt2.

The command provides a clean interface for streaming function logs without requiring users to know service names or pod details. It supports filtering by time and works with both local functions and functions specified by name.

All tests pass and the implementation follows the existing command patterns in the codebase.

Looking forward to your feedback.

Thanks!

[codecov]

Codecov Report

❌ Patch coverage is 29.31034% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.47%. Comparing base (33a9d85) to head (6e9495b).
⚠️ Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/logs.go	28.69%	80 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3669      +/-   ##
==========================================
- Coverage   56.61%   56.47%   -0.14%     
==========================================
  Files         181      182       +1     
  Lines       20853    20969     +116     
==========================================
+ Hits        11806    11843      +37     
- Misses       7833     7911      +78     
- Partials     1214     1215       +1     

Flag	Coverage Δ
e2e	36.20% <29.31%> (-0.06%)	⬇️
e2e go	32.90% <31.52%> (-0.01%)	⬇️
e2e node	28.63% <31.52%> (+0.01%)	⬆️
e2e python	33.27% <31.52%> (-0.02%)	⬇️
e2e quarkus	28.78% <31.52%> (+0.01%)	⬆️
e2e rust	28.18% <31.52%> (+0.02%)	⬆️
e2e springboot	26.66% <31.52%> (+0.03%)	⬆️
e2e typescript	28.74% <31.52%> (+0.01%)	⬆️
e2e-config-ci	18.06% <31.52%> (+0.08%)	⬆️
integration	17.24% <0.00%> (-0.08%)	⬇️
unit macos-14	44.58% <31.52%> (-0.08%)	⬇️
unit macos-latest	44.58% <31.52%> (-0.08%)	⬇️
unit ubuntu-24.04-arm	44.82% <29.31%> (-0.09%)	⬇️
unit ubuntu-latest	45.43% <31.52%> (-0.08%)	⬇️
unit windows-latest	44.56% <31.52%> (-0.08%)	⬇️

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[lkingland]

/ok-to-test
/lgtm
/approve

Thanks for the PR!

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Itx-Psycho0, lkingland

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