podman pod exists

like containers and images, users would benefit from being able to check
if a pod exists in local storage.  if the pod exists, the return code is 0.
if the pod does not exists, the return code is 1.  Any other return code
indicates a real errors, such as permissions or runtime.

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

2 files changed, 38 insertions, 0 deletions

diff --git a/cmd/podman/exists.go b/cmd/podman/exists.go
index 2f7b7c185..2e2559ec7 100644
--- a/cmd/podman/exists.go
+++ b/cmd/podman/exists.go
@@ -44,6 +44,23 @@ var (
 	}
 )
 
+var (
+	podExistsDescription = `
+	podman pod exists
+
+	Check if a pod exists in local storage
+`
+
+	podExistsCommand = cli.Command{
+		Name:         "exists",
+		Usage:        "Check if a pod exists in local storage",
+		Description:  podExistsDescription,
+		Action:       podExistsCmd,
+		ArgsUsage:    "POD-NAME",
+		OnUsageError: usageErrorHandler,
+	}
+)
+
 func imageExistsCmd(c *cli.Context) error {
 	args := c.Args()
 	if len(args) > 1 || len(args) < 1 {
@@ -81,3 +98,23 @@ func containerExistsCmd(c *cli.Context) error {
 	}
 	return nil
 }
+
+func podExistsCmd(c *cli.Context) error {
+	args := c.Args()
+	if len(args) > 1 || len(args) < 1 {
+		return errors.New("you may only check for the existence of one pod at a time")
+	}
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	if _, err := runtime.LookupPod(args[0]); err != nil {
+		if errors.Cause(err) == libpod.ErrNoSuchPod {
+			os.Exit(1)
+		}
+		return err
+	}
+	return nil
+}
diff --git a/cmd/podman/pod.go b/cmd/podman/pod.go
index 0c6ec5e8c..a30361134 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,
+		podExistsCommand,
 		podInspectCommand,
 		podKillCommand,
 		podPauseCommand,