Adding container name to log config

[davidgammon-mettle]

Fixes: #9626

Description
See issue #9626

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[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will have a full review ready in a few minutes. In the meantime, here's a quick summary to help you and other reviewers get up to speed:

This pull request addresses issue #9626 by adding the container name to the log configuration in Skaffold's Kubernetes Job logger. The goal is to improve log streaming by specifying the container from which logs should be retrieved.

Here's a breakdown of the changes:

• pkg/skaffold/k8sjob/logger/log.go: This file received the core changes.
  • Three sections were modified to incorporate the containerName variable.
  • Lines 168-169: A containerName variable is declared to store the container name.
  • Lines 183-184: The containerName variable is populated with the name of the first container in the pod's specification.
  • Lines 199-200: The containerName is used in the PodLogOptions to specify which container's logs to retrieve.

The changes ensure that logs are streamed from the correct container, resolving potential ambiguity and improving the accuracy of log output.

---

And now, a little haiku to lighten the mood:

Containers aligned,
Logs stream clear, a joyful sight,
Skaffold's heart sings on.

Thanks,
Gemini

[code-review-assist]

This pull request addresses issue #9626 by adding the container name to the log configuration, enabling Skaffold to stream logs from a specific container in a Kubernetes Job. This is a valuable improvement. The implementation generally looks correct and efficient. However, the current approach assumes the job only has one container. It's crucial to handle cases where a job might have multiple containers.

Here are a few suggestions to enhance the implementation:

[code-review-assist]

This line assumes the pod has only one container, taking the name of the first container in the spec. Jobs can have multiple containers. Consider adding a mechanism to specify the target container. A few options include:

• --container flag: Allow users to specify the container name via a command-line flag.
• skaffold.yaml configuration: Add a field in the skaffold.yaml to configure the target container for logging.
• Default behavior: If no container is explicitly specified, either log from all containers or emit a warning message indicating the ambiguity and perhaps defaulting to the first container.

Choosing a suitable approach will provide flexibility and prevent unexpected behavior when jobs have multiple containers.

[code-review-assist]

It's good practice to check if containerName is empty before using it in podLogOptions. This will prevent potential issues if the pod has no containers or if the container name retrieval logic encounters an issue. If the name is empty, you could log a warning or return an error, depending on the desired behavior.

Suggested change

	podLogOptions := &corev1.PodLogOptions{Follow: true, Container: containerName}
	podLogOptions := &corev1.PodLogOptions{Follow: true}
	if containerName != "" {
	podLogOptions.Container = containerName
	}