add podman pod inspect

first pass of podman pod inspect

Signed-off-by: baude <bbaude@redhat.com>

Closes: #1236
Approved by: rhatdan

7 files changed, 235 insertions, 0 deletions

diff --git a/cmd/podman/pod.go b/cmd/podman/pod.go
index ed79f0711..a298ca32b 100644
--- a/cmd/podman/pod.go
+++ b/cmd/podman/pod.go
@@ -11,6 +11,7 @@ Pods are a group of one or more containers sharing the same network, pid and ipc
 `
 	podSubCommands = []cli.Command{
 		podCreateCommand,
+		podInspectCommand,
 		podKillCommand,
 		podPauseCommand,
 		podPsCommand,
diff --git a/cmd/podman/pod_inspect.go b/cmd/podman/pod_inspect.go
new file mode 100644
index 000000000..6935335a6
--- /dev/null
+++ b/cmd/podman/pod_inspect.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"encoding/json"
+
+	"fmt"
+	"github.com/pkg/errors"
+	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
+	"github.com/projectatomic/libpod/libpod"
+	"github.com/urfave/cli"
+)
+
+var (
+	podInspectFlags = []cli.Flag{
+		LatestPodFlag,
+	}
+	podInspectDescription = "display the configuration for a pod by name or id"
+	podInspectCommand     = cli.Command{
+		Name:                   "inspect",
+		Usage:                  "displays a pod configuration",
+		Description:            podInspectDescription,
+		Flags:                  podInspectFlags,
+		Action:                 podInspectCmd,
+		UseShortOptionHandling: true,
+		ArgsUsage:              "[POD_NAME_OR_ID]",
+	}
+)
+
+func podInspectCmd(c *cli.Context) error {
+	var (
+		pod *libpod.Pod
+	)
+	if err := checkMutuallyExclusiveFlags(c); err != nil {
+		return err
+	}
+	args := c.Args()
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	if c.Bool("latest") {
+		pod, err = runtime.GetLatestPod()
+		if err != nil {
+			return errors.Wrapf(err, "unable to get latest pod")
+		}
+	} else {
+		pod, err = runtime.LookupPod(args[0])
+		if err != nil {
+			return err
+		}
+	}
+
+	podInspectData, err := pod.Inspect()
+	if err != nil {
+		return err
+	}
+	b, err := json.MarshalIndent(&podInspectData, "", "     ")
+	if err != nil {
+		return err
+	}
+	fmt.Println(string(b))
+	return nil
+}
diff --git a/commands.md b/commands.md
index 3ac195476..d3e8d93cc 100644
--- a/commands.md
+++ b/commands.md
@@ -31,6 +31,7 @@
 | [podman-pause(1)](/docs/podman-pause.1.md)               | Pause one or more running containers                                      |[![...](/docs/play.png)](https://asciinema.org/a/141292)|
 | [podman-pod(1)](/docs/podman-pod.1.md)                   | Simple management tool for groups of containers, called pods              ||
 | [podman-pod-create(1)](/docs/podman-pod-create.1.md)     | Create a new pod                                                          ||
+| [podman-pod-inspect(1)](/docs/podman-pod-inspect.1.md)   | Inspect a pod                                                             ||
 | [podman-pod-kill(1)](podman-pod-kill.1.md)               | Kill the main process of each container in pod.                           ||
 | [podman-pod-ps(1)](/docs/podman-pod-ps.1.md)             | List the pods on the system                                               ||
 | [podman-pod-pause(1)](podman-pod-pause.1.md)             | Pause one or more pods.                                                   ||
diff --git a/docs/podman-pod-inspect.1.md b/docs/podman-pod-inspect.1.md
new file mode 100644
index 000000000..edcd5dcef
--- /dev/null
+++ b/docs/podman-pod-inspect.1.md
@@ -0,0 +1,48 @@
+% podman-pod-inspect "1"
+
+## NAME
+podman\-pod\-inspect - Displays information describing a pod
+
+## SYNOPSIS
+**podman pod inspect** [*options*] *pod* ...
+
+## DESCRIPTION
+Displays configuration and state information about a given pod.  It also displays information about containers
+that belong to the pod.
+
+## OPTIONS
+**--latest, -l**
+
+Instead of providing the pod name or ID, use the last created pod. If you use methods other than Podman
+to run pods such as CRI-O, the last started pod could be from either of those methods.
+
+
+## EXAMPLE
+```
+# podman pod inspect foobar
+{
+     "Config": {
+          "id": "3513ca70583dd7ef2bac83331350f6b6c47d7b4e526c908e49d89ebf720e4693",
+          "name": "foobar",
+          "labels": {},
+          "cgroupParent": "/libpod_parent",
+          "UsePodCgroup": true,
+          "created": "2018-08-08T11:15:18.823115347-05:00"
+     },
+     "State": {
+          "CgroupPath": ""
+     },
+     "Containers": [
+          {
+               "id": "d53f8bf1e9730281264aac6e6586e327429f62c704abea4b6afb5d8a2b2c9f2c",
+               "state": "configured"
+          }
+     ]
+}
+```
+
+## SEE ALSO
+podman-pod(1), podman-pod-ps(1)
+
+## HISTORY
+August 2018, Originally compiled by Brent Baude <bbaude@redhat.com>
diff --git a/libpod/pod.go b/libpod/pod.go
index 2ad4f7d0e..46182680a 100644
--- a/libpod/pod.go
+++ b/libpod/pod.go
@@ -10,6 +10,7 @@ import (
 	"github.com/docker/docker/pkg/stringid"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"github.com/ulule/deepcopier"
 )
 
 // Pod represents a group of containers that are managed together.
@@ -59,6 +60,20 @@ type podState struct {
 	CgroupPath string
 }
 
+// PodInspect represents the data we want to display for
+// podman pod inspect
+type PodInspect struct {
+	Config     *PodConfig
+	State      *podState
+	Containers []PodContainerInfo
+}
+
+// PodContainerInfo keeps information on a container in a pod
+type PodContainerInfo struct {
+	ID    string `json:"id"`
+	State string `json:"state"`
+}
+
 // ID retrieves the pod's ID
 func (p *Pod) ID() string {
 	return p.config.ID
@@ -696,3 +711,38 @@ func (p *Pod) Status() (map[string]ContainerStatus, error) {
 // TODO add pod batching
 // Lock pod to avoid lock contention
 // Store and lock all containers (no RemoveContainer in batch guarantees cache will not become stale)
+
+// Inspect returns a PodInspect struct to describe the pod
+func (p *Pod) Inspect() (*PodInspect, error) {
+	var (
+		podContainers []PodContainerInfo
+	)
+
+	containers, err := p.AllContainers()
+	if err != nil {
+		return &PodInspect{}, err
+	}
+	for _, c := range containers {
+		containerStatus := "unknown"
+		// Ignoring possible errors here because we dont want this to be
+		// catastrophic in nature
+		containerState, err := c.State()
+		if err == nil {
+			containerStatus = containerState.String()
+		}
+		pc := PodContainerInfo{
+			ID:    c.ID(),
+			State: containerStatus,
+		}
+		podContainers = append(podContainers, pc)
+	}
+
+	config := new(PodConfig)
+	deepcopier.Copy(p.config).To(config)
+	inspectData := PodInspect{
+		Config:     config,
+		State:      p.state,
+		Containers: podContainers,
+	}
+	return &inspectData, nil
+}
diff --git a/test/e2e/libpod_suite_test.go b/test/e2e/libpod_suite_test.go
index e95b03cb9..3b7953672 100644
--- a/test/e2e/libpod_suite_test.go
+++ b/test/e2e/libpod_suite_test.go
@@ -19,6 +19,7 @@ import (
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 	"github.com/onsi/gomega/gexec"
+	"github.com/projectatomic/libpod/libpod"
 	"github.com/projectatomic/libpod/pkg/inspect"
 )
 
@@ -339,6 +340,14 @@ func (s *PodmanSession) InspectContainerToJSON() []inspect.ContainerData {
 	return i
 }
 
+// InspectPodToJSON takes the sessions output from a pod inspect and returns json
+func (s *PodmanSession) InspectPodToJSON() libpod.PodInspect {
+	var i libpod.PodInspect
+	err := json.Unmarshal(s.Out.Contents(), &i)
+	Expect(err).To(BeNil())
+	return i
+}
+
 // InspectImageJSON takes the session output of an inspect
 // image and returns json
 func (s *PodmanSession) InspectImageJSON() []inspect.ImageData {
diff --git a/test/e2e/pod_inspect_test.go b/test/e2e/pod_inspect_test.go
new file mode 100644
index 000000000..b5c2bd1be
--- /dev/null
+++ b/test/e2e/pod_inspect_test.go
@@ -0,0 +1,61 @@
+package integration
+
+import (
+	"fmt"
+	"os"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Podman pod inspect", func() {
+	var (
+		tempdir    string
+		err        error
+		podmanTest PodmanTest
+	)
+
+	BeforeEach(func() {
+		tempdir, err = CreateTempDirInTempDir()
+		if err != nil {
+			os.Exit(1)
+		}
+		podmanTest = PodmanCreate(tempdir)
+		podmanTest.RestoreAllArtifacts()
+	})
+
+	AfterEach(func() {
+		podmanTest.CleanupPod()
+		f := CurrentGinkgoTestDescription()
+		timedResult := fmt.Sprintf("Test: %s completed in %f seconds", f.TestText, f.Duration.Seconds())
+		GinkgoWriter.Write([]byte(timedResult))
+	})
+
+	It("podman inspect bogus pod", func() {
+		session := podmanTest.Podman([]string{"pod", "inspect", "foobar"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Not(Equal(0)))
+	})
+
+	It("podman inspect a pod", func() {
+		session := podmanTest.Podman([]string{"pod", "create"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		podid := session.OutputToString()
+
+		session = podmanTest.RunTopContainerInPod("", podid)
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		session = podmanTest.RunTopContainerInPod("", podid)
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		inspect := podmanTest.Podman([]string{"pod", "inspect", podid})
+		inspect.WaitWithDefaultTimeout()
+		Expect(inspect.ExitCode()).To(Equal(0))
+		Expect(inspect.IsJSONOutputValid()).To(BeTrue())
+		podData := inspect.InspectPodToJSON()
+		Expect(podData.Config.ID).To(Equal(podid))
+	})
+})