Add podman refresh command

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

Closes: #981
Approved by: baude

cmd/podman/main.go

@@ -62,6 +62,7 @@ func main() {
 		portCommand,
 		pullCommand,
 		pushCommand,
+		refreshCommand,
 		restartCommand,
 		rmCommand,
 		rmiCommand,

cmd/podman/refresh.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/pkg/errors"
+	"github.com/projectatomic/libpod/cmd/podman/libpodruntime"
+	"github.com/urfave/cli"
+)
+
+var (
+	refreshFlags = []cli.Flag{}
+
+	refreshDescription = "The refresh command resets the state of all containers to handle database changes after a Podman upgrade. All running containers will be restarted."
+
+	refreshCommand = cli.Command{
+		Name:                   "refresh",
+		Usage:                  "Refresh container state",
+		Description:            refreshDescription,
+		Flags:                  refreshFlags,
+		Action:                 refreshCmd,
+		UseShortOptionHandling: true,
+	}
+)
+
+func refreshCmd(c *cli.Context) error {
+	if len(c.Args()) > 0 {
+		return errors.Errorf("refresh does not accept any arguments")
+	}
+
+	if err := validateFlags(c, refreshFlags); err != nil {
+		return err
+	}
+
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "error creating libpod runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	allCtrs, err := runtime.GetAllContainers()
+	if err != nil {
+		return err
+	}
+
+	ctx := getContext()
+
+	var lastError error
+	for _, ctr := range allCtrs {
+		if err := ctr.Refresh(ctx); err != nil {
+			if lastError != nil {
+				fmt.Fprintln(os.Stderr, lastError)
+			}
+			lastError = errors.Wrapf(err, "error refreshing container %s state", ctr.ID())
+		}
+	}
+
+	return lastError
+}