Add "podman volume" command

Add support for podman volume and its subcommands.
The commands supported are:
	podman volume create
	podman volume inspect
	podman volume ls
	podman volume rm
	podman volume prune

This is a tool to manage volumes used by podman. For now it only handle
named volumes, but eventually it will handle all volumes used by podman.

Signed-off-by: umohnani8 <umohnani@redhat.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/cmd/podman/volume_prune.go b/cmd/podman/volume_prune.go
new file mode 100644
index 000000000..652c50f42
--- /dev/null
+++ b/cmd/podman/volume_prune.go
@@ -0,0 +1,86 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/containers/libpod/cmd/podman/libpodruntime"
+	"github.com/containers/libpod/libpod"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+var volumePruneDescription = `
+podman volume prune
+
+Remove all unused volumes. Will prompt for confirmation if not
+using force.
+`
+
+var volumePruneFlags = []cli.Flag{
+	cli.BoolFlag{
+		Name:  "force, f",
+		Usage: "Do not prompt for confirmation",
+	},
+}
+
+var volumePruneCommand = cli.Command{
+	Name:                   "prune",
+	Usage:                  "Remove all unused volumes",
+	Description:            volumePruneDescription,
+	Flags:                  volumePruneFlags,
+	Action:                 volumePruneCmd,
+	SkipArgReorder:         true,
+	UseShortOptionHandling: true,
+}
+
+func volumePruneCmd(c *cli.Context) error {
+	var lastError error
+
+	if err := validateFlags(c, volumePruneFlags); err != nil {
+		return err
+	}
+
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "error creating libpod runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	ctx := getContext()
+
+	// Prompt for confirmation if --force is not set
+	if !c.Bool("force") {
+		reader := bufio.NewReader(os.Stdin)
+		fmt.Println("WARNING! This will remove all volumes not used by at least one container.")
+		fmt.Print("Are you sure you want to continue? [y/N] ")
+		ans, err := reader.ReadString('\n')
+		if err != nil {
+			return errors.Wrapf(err, "error reading input")
+		}
+		if strings.ToLower(ans)[0] != 'y' {
+			return nil
+		}
+	}
+
+	volumes, err := runtime.GetAllVolumes()
+	if err != nil {
+		return err
+	}
+
+	for _, vol := range volumes {
+		err = runtime.RemoveVolume(ctx, vol, false, true)
+		if err == nil {
+			fmt.Println(vol.Name())
+		} else if err != libpod.ErrVolumeBeingUsed {
+			if lastError != nil {
+				logrus.Errorf("%q", lastError)
+			}
+			lastError = errors.Wrapf(err, "failed to remove volume %q", vol.Name())
+		}
+	}
+	return lastError
+}