podman import, load, and commit are too verbose

The progress should not be show for import, load, and commit.  It makes machine
parsing of the output much more difficult.  Also, each command should output an
image ID or name for the user.

Added a --verbose flag for users that still want to see progress.

Resolves issue #450

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

Closes: #456
Approved by: rhatdan

cmd/podman/commit.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/projectatomic/libpod/libpod"
@@ -25,6 +28,10 @@ var (
 			Name:  "pause, p",
 			Usage: "Pause container during commit",
 		},
+		cli.BoolFlag{
+			Name:  "quiet, q",
+			Usage: "Suppress output",
+		},
 	}
 	commitDescription = `Create an image from a container's changes.
 	 Optionally tag the image created, set the author with the --author flag,
@@ -84,10 +91,19 @@ func commitCmd(c *cli.Context) error {
 		Author:  c.String("author"),
 	}
 	opts.ImageConfig = config
+	opts.Writer = nil
+
+	if !c.Bool("quiet") {
+		opts.Writer = os.Stderr
+	}
 
 	ctr, err := runtime.LookupContainer(container)
 	if err != nil {
 		return errors.Wrapf(err, "error looking up container %q", container)
 	}
-	return ctr.Commit(c.BoolT("pause"), opts)
+	img, err := ctr.Commit(c.BoolT("pause"), opts)
+	if err == nil {
+		fmt.Println(img.ID)
+	}
+	return nil
 }

cmd/podman/import.go

@@ -25,6 +25,10 @@ var (
 			Name:  "message, m",
 			Usage: "Set commit message for imported image",
 		},
+		cli.BoolFlag{
+			Name:  "quiet, q",
+			Usage: "Suppress output",
+		},
 	}
 	importDescription = `Create a container image from the contents of the specified tarball (.tar, .tar.gz, .tgz, .bzip, .tar.xz, .txz).
 	 Note remote tar balls can be specified, via web address.
@@ -84,6 +88,11 @@ func importCmd(c *cli.Context) error {
 	}
 
 	opts.ImageConfig = config
+	opts.Writer = nil
+
+	if !c.Bool("quiet") {
+		opts.Writer = os.Stderr
+	}
 
 	// if source is a url, download it and save to a temp file
 	u, err := url.ParseRequestURI(source)
@@ -96,7 +105,11 @@ func importCmd(c *cli.Context) error {
 		source = file
 	}
 
-	return runtime.ImportImage(source, opts)
+	img, err := runtime.ImportImage(source, opts)
+	if err == nil {
+		fmt.Println(img.ID)
+	}
+	return err
 }
 
 // donwloadFromURL downloads an image in the format "https:/example.com/myimage.tar"