Add ability to prune containers and images

Allow user to prune unused/unnamed images, the layer images from building,
via podman rmi --prune.

Allow user to prune stopped/exiuted containers via podman rm --prune.

This should resolve #1910

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

13 files changed, 351 insertions, 6 deletions

diff --git a/cmd/podman/container.go b/cmd/podman/container.go
index b6262f890..b0232c874 100644
--- a/cmd/podman/container.go
+++ b/cmd/podman/container.go
@@ -22,7 +22,7 @@ var (
 		mountCommand,
 		pauseCommand,
 		portCommand,
-		//		pruneCommand,
+		pruneContainersCommand,
 		refreshCommand,
 		restartCommand,
 		restoreCommand,
diff --git a/cmd/podman/containers_prune.go b/cmd/podman/containers_prune.go
new file mode 100644
index 000000000..92604e82f
--- /dev/null
+++ b/cmd/podman/containers_prune.go
@@ -0,0 +1,74 @@
+package main
+
+import (
+	"github.com/containers/libpod/cmd/podman/libpodruntime"
+	"github.com/containers/libpod/cmd/podman/shared"
+	"github.com/containers/libpod/libpod"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+var (
+	pruneContainersDescription = `
+	podman container prune
+
+	Removes all exited containers
+`
+
+	pruneContainersCommand = cli.Command{
+		Name:         "prune",
+		Usage:        "Remove all stopped containers",
+		Description:  pruneContainersDescription,
+		Action:       pruneContainersCmd,
+		OnUsageError: usageErrorHandler,
+	}
+)
+
+func pruneContainersCmd(c *cli.Context) error {
+	var (
+		deleteFuncs []shared.ParallelWorkerInput
+	)
+
+	ctx := getContext()
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	filter := func(c *libpod.Container) bool {
+		state, _ := c.State()
+		if state == libpod.ContainerStateStopped || (state == libpod.ContainerStateExited && err == nil && c.PodID() == "") {
+			return true
+		}
+		return false
+	}
+	delContainers, err := runtime.GetContainers(filter)
+	if err != nil {
+		return err
+	}
+	if len(delContainers) < 1 {
+		return nil
+	}
+	for _, container := range delContainers {
+		con := container
+		f := func() error {
+			return runtime.RemoveContainer(ctx, con, c.Bool("force"))
+		}
+
+		deleteFuncs = append(deleteFuncs, shared.ParallelWorkerInput{
+			ContainerID:  con.ID(),
+			ParallelFunc: f,
+		})
+	}
+	maxWorkers := shared.Parallelize("rm")
+	if c.GlobalIsSet("max-workers") {
+		maxWorkers = c.GlobalInt("max-workers")
+	}
+	logrus.Debugf("Setting maximum workers to %d", maxWorkers)
+
+	// Run the parallel funcs
+	deleteErrors, errCount := shared.ParallelExecuteWorkerPool(maxWorkers, deleteFuncs)
+	return printParallelOutput(deleteErrors, errCount)
+}
diff --git a/cmd/podman/image.go b/cmd/podman/image.go
index 418b442e3..95af36df5 100644
--- a/cmd/podman/image.go
+++ b/cmd/podman/image.go
@@ -13,7 +13,7 @@ var (
 		inspectCommand,
 		loadCommand,
 		lsImagesCommand,
-		//		pruneCommand,
+		pruneImagesCommand,
 		pullCommand,
 		pushCommand,
 		rmImageCommand,
diff --git a/cmd/podman/images_prune.go b/cmd/podman/images_prune.go
new file mode 100644
index 000000000..cb72a498f
--- /dev/null
+++ b/cmd/podman/images_prune.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"github.com/containers/libpod/cmd/podman/libpodruntime"
+	"github.com/containers/libpod/cmd/podman/shared"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+)
+
+var (
+	pruneImagesDescription = `
+	podman image prune
+
+	Removes all unnamed images from local storage
+`
+
+	pruneImagesCommand = cli.Command{
+		Name:         "prune",
+		Usage:        "Remove unused images",
+		Description:  pruneImagesDescription,
+		Action:       pruneImagesCmd,
+		OnUsageError: usageErrorHandler,
+	}
+)
+
+func pruneImagesCmd(c *cli.Context) error {
+	runtime, err := libpodruntime.GetRuntime(c)
+	if err != nil {
+		return errors.Wrapf(err, "could not get runtime")
+	}
+	defer runtime.Shutdown(false)
+
+	return shared.Prune(runtime.ImageRuntime())
+}
diff --git a/cmd/podman/shared/prune.go b/cmd/podman/shared/prune.go
new file mode 100644
index 000000000..90cfe4475
--- /dev/null
+++ b/cmd/podman/shared/prune.go
@@ -0,0 +1,24 @@
+package shared
+
+import (
+	"fmt"
+	"github.com/pkg/errors"
+
+	"github.com/containers/libpod/libpod/image"
+)
+
+// Prune removes all unnamed and unused images from the local store
+func Prune(ir *image.Runtime) error {
+	pruneImages, err := ir.GetPruneImages()
+	if err != nil {
+		return err
+	}
+
+	for _, i := range pruneImages {
+		if err := i.Remove(true); err != nil {
+			return errors.Wrapf(err, "failed to remove %s", i.ID())
+		}
+		fmt.Println(i.ID())
+	}
+	return nil
+}
diff --git a/completions/bash/podman b/completions/bash/podman
index 9518cfa22..79ab91410 100644
--- a/completions/bash/podman
+++ b/completions/bash/podman
@@ -871,6 +871,7 @@ _podman_container() {
 	 create
 	 diff
 	 exec
+	 exists
 	 export
 	 inspect
 	 kill
@@ -879,6 +880,7 @@ _podman_container() {
 	 mount
 	 pause
 	 port
+	 prune
 	 refresh
 	 restart
 	 restore
@@ -1210,11 +1212,13 @@ _podman_image() {
      "
      subcommands="
 	 build
+	 exists
 	 history
 	 import
 	 inspect
 	 load
 	 ls
+	 prune
 	 pull
 	 push
 	 rm
@@ -2227,6 +2231,26 @@ _podman_container_runlabel() {
     esac
 }
 
+_podman_images_prune() {
+    local options_with_args="
+    "
+
+    local boolean_options="
+     -h
+	 --help
+  "
+}
+
+_podman_container_prune() {
+    local options_with_args="
+    "
+
+    local boolean_options="
+     -h
+	 --help
+  "
+}
+
 _podman_container_exists() {
     local options_with_args="
     "
diff --git a/docs/podman-container-prune.1.md b/docs/podman-container-prune.1.md
new file mode 100644
index 000000000..1f3ef1d41
--- /dev/null
+++ b/docs/podman-container-prune.1.md
@@ -0,0 +1,31 @@
+% PODMAN(1) Podman Man Pages
+% Brent Baude
+% December 2018
+# NAME
+podman-container-prune - Remove all stopped containers
+
+# SYNOPSIS
+**podman container prune**
+[**-h**|**--help**]
+
+# DESCRIPTION
+**podman container prune** removes all stopped containers from local storage.
+
+## Examples ##
+
+Remove all stopped containers from local storage
+```
+$ sudo podman container prune
+878392adf2e6c5c9bb1fc19b69d37d2e98c8abf9d539c0bce4b15b46bbcce471
+37664467fbe3618bf9479c34393ac29c02696675addf1750f9e346581636cde7
+ed0c6468b8e1cb641b4621d1fe30cb477e1fefc5c0bceb66feaf2f7cb50e5962
+6ac6c8f0067b7a4682e6b8e18902665b57d1a0e07e885d9abcd382232a543ccd
+fff1c5b6c3631746055ec40598ce8ecaa4b82aef122f9e3a85b03b55c0d06c23
+602d343cd47e7cb3dfc808282a9900a3e4555747787ec6723bb68cedab8384d5
+```
+
+## SEE ALSO
+podman(1), podman-ps
+
+# HISTORY
+December 2018, Originally compiled by Brent Baude (bbaude at redhat dot com)
diff --git a/docs/podman-container.1.md b/docs/podman-container.1.md
index aa5dfa82c..3675d9719 100644
--- a/docs/podman-container.1.md
+++ b/docs/podman-container.1.md
@@ -29,6 +29,7 @@ The container command allows you to manage containers
 | mount    | [podman-mount(1)](podman-mount.1.md)                | Mount a working container's root filesystem.                                 |
 | pause    | [podman-pause(1)](podman-pause.1.md)                | Pause one or more containers.                                                |
 | port     | [podman-port(1)](podman-port.1.md)                  | List port mappings for the container.                                        |
+| prune    | [podman-container-prune(1)](podman-container-prune.1.md)                  | Remove all stopped containers from local storage        |
 | refresh  | [podman-refresh(1)](podman-container-refresh.1.md)  | Refresh the state of all containers                                          |
 | restart  | [podman-restart(1)](podman-restart.1.md)            | Restart one or more containers.                                              |
 | restore  | [podman-container-restore(1)](podman-container-restore.1.md)  | Restores one or more containers from a checkpoint.                 |
diff --git a/docs/podman-image-prune.1.md b/docs/podman-image-prune.1.md
new file mode 100644
index 000000000..db76b26e0
--- /dev/null
+++ b/docs/podman-image-prune.1.md
@@ -0,0 +1,32 @@
+% PODMAN(1) Podman Man Pages
+% Brent Baude
+% December 2018
+# NAME
+podman-image-prune - Remove all unused images
+
+# SYNOPSIS
+**podman image prune**
+[**-h**|**--help**]
+
+# DESCRIPTION
+**podman image prune** removes all unused images from local storage. An unused image
+is defined as an image that does not have any containers based on it.
+
+## Examples ##
+
+Remove all unused images from local storage
+```
+$ sudo podman image prune
+f3e20dc537fb04cb51672a5cb6fdf2292e61d411315549391a0d1f64e4e3097e
+324a7a3b2e0135f4226ffdd473e4099fd9e477a74230cdc35de69e84c0f9d907
+6125002719feb1ddf3030acab1df6156da7ce0e78e571e9b6e9c250424d6220c
+91e732da5657264c6f4641b8d0c4001c218ae6c1adb9dcef33ad00cafd37d8b6
+e4e5109420323221f170627c138817770fb64832da7d8fe2babd863148287fca
+77a57fa8285e9656dbb7b23d9efa837a106957409ddd702f995605af27a45ebe
+```
+
+## SEE ALSO
+podman(1), podman-images
+
+# HISTORY
+December 2018, Originally compiled by Brent Baude (bbaude at redhat dot com)
diff --git a/docs/podman-image.1.md b/docs/podman-image.1.md
index 446f8667d..8b812af11 100644
--- a/docs/podman-image.1.md
+++ b/docs/podman-image.1.md
@@ -21,6 +21,7 @@ The image command allows you to manage images
 | load     | [podman-load(1)](podman-load.1.md)        | Load an image from the docker archive.                                         |
 | ls       | [podman-images(1)](podman-images.1.md)    | Prints out information about images.                                           |
 | pull     | [podman-pull(1)](podman-pull.1.md)        | Pull an image from a registry.                                                 |
+| prune| [podman-container-prune(1)](podman-container-prune.1.md)        | Removed all unused images from the local store                                 |
 | push     | [podman-push(1)](podman-push.1.md)        | Push an image from local storage to elsewhere.                                 |
 | rm       | [podman-rm(1)](podman-rmi.1.md)           | Removes one or more locally stored images.                                     |
 | save     | [podman-save(1)](podman-save.1.md)        | Save an image to docker-archive or oci.                                        |
diff --git a/docs/podman-rmi.1.md b/docs/podman-rmi.1.md
index f035897ee..9c080c9f1 100644
--- a/docs/podman-rmi.1.md
+++ b/docs/podman-rmi.1.md
@@ -19,15 +19,25 @@ Remove all images in the local storage.
 
 This option will cause podman to remove all containers that are using the image before removing the image from the system.
 
-## EXAMPLE
-
-podman rmi imageID
 
+Remove an image by its short ID
+```
+podman rmi c0ed59d05ff7
+```
+Remove an image and its associated containers.
+```
 podman rmi --force imageID
+````
 
-podman rmi imageID1 imageID2 imageID3
+Remove multiple images by their shortened IDs.
+```
+podman rmi c4dfb1609ee2 93fd78260bd1 c0ed59d05ff7
+```
 
+Remove all images and containers.
+```
 podman rmi -a -f
+```
 
 ## SEE ALSO
 podman(1)
diff --git a/libpod/image/prune.go b/libpod/image/prune.go
new file mode 100644
index 000000000..6a1f160d5
--- /dev/null
+++ b/libpod/image/prune.go
@@ -0,0 +1,26 @@
+package image
+
+// GetPruneImages returns a slice of images that have no names/unused
+func (ir *Runtime) GetPruneImages() ([]*Image, error) {
+	var (
+		unamedImages []*Image
+	)
+	allImages, err := ir.GetImages()
+	if err != nil {
+		return nil, err
+	}
+	for _, i := range allImages {
+		if len(i.Names()) == 0 {
+			unamedImages = append(unamedImages, i)
+			continue
+		}
+		containers, err := i.Containers()
+		if err != nil {
+			return nil, err
+		}
+		if len(containers) < 1 {
+			unamedImages = append(unamedImages, i)
+		}
+	}
+	return unamedImages, nil
+}
diff --git a/test/e2e/prune_test.go b/test/e2e/prune_test.go
new file mode 100644
index 000000000..6679a676c
--- /dev/null
+++ b/test/e2e/prune_test.go
@@ -0,0 +1,88 @@
+package integration
+
+import (
+	"fmt"
+	"os"
+
+	. "github.com/containers/libpod/test/utils"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var pruneImage = `
+FROM  alpine:latest
+LABEL RUN podman --version
+RUN apk update
+RUN apk add bash`
+
+var _ = Describe("Podman rm", func() {
+	var (
+		tempdir    string
+		err        error
+		podmanTest *PodmanTestIntegration
+	)
+
+	BeforeEach(func() {
+		tempdir, err = CreateTempDirInTempDir()
+		if err != nil {
+			os.Exit(1)
+		}
+		podmanTest = PodmanTestCreate(tempdir)
+		podmanTest.RestoreAllArtifacts()
+	})
+
+	AfterEach(func() {
+		podmanTest.Cleanup()
+		f := CurrentGinkgoTestDescription()
+		timedResult := fmt.Sprintf("Test: %s completed in %f seconds", f.TestText, f.Duration.Seconds())
+		GinkgoWriter.Write([]byte(timedResult))
+	})
+
+	It("podman container prune containers", func() {
+		top := podmanTest.RunTopContainer("")
+		top.WaitWithDefaultTimeout()
+		Expect(top.ExitCode()).To(Equal(0))
+
+		session := podmanTest.Podman([]string{"run", ALPINE, "ls"})
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+
+		prune := podmanTest.Podman([]string{"container", "prune"})
+		prune.WaitWithDefaultTimeout()
+		Expect(prune.ExitCode()).To(Equal(0))
+
+		Expect(podmanTest.NumberOfContainers()).To(Equal(1))
+	})
+
+	It("podman image prune none images", func() {
+		podmanTest.BuildImage(pruneImage, "alpine_bash:latest", "true")
+
+		none := podmanTest.Podman([]string{"images", "-a"})
+		none.WaitWithDefaultTimeout()
+		Expect(none.ExitCode()).To(Equal(0))
+		hasNone, _ := none.GrepString("<none>")
+		Expect(hasNone).To(BeTrue())
+
+		prune := podmanTest.Podman([]string{"image", "prune"})
+		prune.WaitWithDefaultTimeout()
+		Expect(prune.ExitCode()).To(Equal(0))
+
+		after := podmanTest.Podman([]string{"images", "-a"})
+		after.WaitWithDefaultTimeout()
+		Expect(none.ExitCode()).To(Equal(0))
+		hasNoneAfter, _ := after.GrepString("<none>")
+		Expect(hasNoneAfter).To(BeFalse())
+	})
+
+	It("podman image prune unused images", func() {
+		prune := podmanTest.Podman([]string{"image", "prune"})
+		prune.WaitWithDefaultTimeout()
+		Expect(prune.ExitCode()).To(Equal(0))
+
+		images := podmanTest.Podman([]string{"images", "-a"})
+		images.WaitWithDefaultTimeout()
+		// all images are unused, so they all should be deleted!
+		Expect(len(images.OutputToStringArray())).To(Equal(0))
+	})
+
+})