kube: Add support for podman pod logs

Following PR adds support for `kubectl` like `pod logs` to podman.
Usage `podman pod logs <podIDorName` gives a stream of logs for all
the containers within the pod with **containername** as a field.

Just like **`kubectl`** also supports `podman pod logs -c ctrIDorName podIDorName`
to limit the log stream to any of the specificied container which belongs to pod.

Signed-off-by: Aditya Rajan <arajan@redhat.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/pkg/domain/infra/abi/pods.go b/pkg/domain/infra/abi/pods.go
index 98233f60d..6b432c214 100644
--- a/pkg/domain/infra/abi/pods.go
+++ b/pkg/domain/infra/abi/pods.go
@@ -83,6 +83,46 @@ func (ic *ContainerEngine) PodKill(ctx context.Context, namesOrIds []string, opt
 	return reports, nil
 }
 
+func (ic *ContainerEngine) PodLogs(ctx context.Context, nameOrID string, options entities.PodLogsOptions) error {
+	// Implementation accepts slice
+	podName := []string{nameOrID}
+	pod, err := getPodsByContext(false, options.Latest, podName, ic.Libpod)
+	if err != nil {
+		return err
+	}
+	// Get pod containers
+	podCtrs, err := pod[0].AllContainers()
+	if err != nil {
+		return err
+	}
+
+	ctrNames := []string{}
+	// Check if `kubectl pod logs -c ctrname <podname>` alike command is used
+	if options.ContainerName != "" {
+		ctrFound := false
+		for _, ctr := range podCtrs {
+			if ctr.ID() == options.ContainerName || ctr.Name() == options.ContainerName {
+				ctrNames = append(ctrNames, options.ContainerName)
+				ctrFound = true
+			}
+		}
+		if !ctrFound {
+			return errors.Wrapf(define.ErrNoSuchCtr, "container %s is not in pod %s", options.ContainerName, nameOrID)
+		}
+	} else {
+		// No container name specified select all containers
+		for _, ctr := range podCtrs {
+			ctrNames = append(ctrNames, ctr.Name())
+		}
+	}
+
+	// PodLogsOptions are similar but contains few extra fields like ctrName
+	// So cast other values as is so we can re-use the code
+	containerLogsOpts := entities.PodLogsOptionsToContainerLogsOptions(options)
+
+	return ic.ContainerLogs(ctx, ctrNames, containerLogsOpts)
+}
+
 func (ic *ContainerEngine) PodPause(ctx context.Context, namesOrIds []string, options entities.PodPauseOptions) ([]*entities.PodPauseReport, error) {
 	reports := []*entities.PodPauseReport{}
 	pods, err := getPodsByContext(options.All, options.Latest, namesOrIds, ic.Libpod)
diff --git a/pkg/domain/infra/tunnel/pods.go b/pkg/domain/infra/tunnel/pods.go
index 480adb88a..8139216b3 100644
--- a/pkg/domain/infra/tunnel/pods.go
+++ b/pkg/domain/infra/tunnel/pods.go
@@ -42,6 +42,16 @@ func (ic *ContainerEngine) PodKill(ctx context.Context, namesOrIds []string, opt
 	return reports, nil
 }
 
+func (ic *ContainerEngine) PodLogs(_ context.Context, nameOrIDs string, options entities.PodLogsOptions) error {
+	// PodLogsOptions are similar but contains few extra fields like ctrName
+	// So cast other values as is so we can re-use the code
+	containerLogsOpts := entities.PodLogsOptionsToContainerLogsOptions(options)
+
+	// interface only accepts slice, keep everything consistent
+	name := []string{options.ContainerName}
+	return ic.ContainerLogs(nil, name, containerLogsOpts)
+}
+
 func (ic *ContainerEngine) PodPause(ctx context.Context, namesOrIds []string, options entities.PodPauseOptions) ([]*entities.PodPauseReport, error) {
 	foundPods, err := getPodsByContext(ic.ClientCtx, options.All, namesOrIds)
 	if err != nil {