Implement --latest for ps

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #944
Approved by: rhatdan

1 files changed, 22 insertions, 12 deletions

diff --git a/cmd/podman/ps.go b/cmd/podman/ps.go
index aa544e6d1..69911248b 100644
--- a/cmd/podman/ps.go
+++ b/cmd/podman/ps.go
@@ -199,20 +199,30 @@ func psCmd(c *cli.Context) error {
 		}
 	}
 
-	containers, err := runtime.GetContainers(filterFuncs...)
-	if err != nil {
-		return err
-	}
-
-	// TODO: Latest and Last are broken right now due to lack of container
-	// ordering
 	var outputContainers []*libpod.Container
-	if opts.Latest && len(containers) > 0 {
-		outputContainers = append(outputContainers, containers[0])
-	} else if opts.Last > 0 && opts.Last <= len(containers) {
-		outputContainers = append(outputContainers, containers[:opts.Last]...)
+
+	if !opts.Latest {
+		// Get all containers
+		containers, err := runtime.GetContainers(filterFuncs...)
+		if err != nil {
+			return err
+		}
+
+		// We only want the last few containers
+		if opts.Last > 0 && opts.Last <= len(containers) {
+			return errors.Errorf("--last not yet supported")
+		} else {
+			outputContainers = containers
+		}
 	} else {
-		outputContainers = containers
+		// Get just the latest container
+		// Ignore filters
+		latestCtr, err := runtime.GetLatestContainer()
+		if err != nil {
+			return err
+		}
+
+		outputContainers = []*libpod.Container{latestCtr}
 	}
 
 	return generatePsOutput(outputContainers, opts)