Merge pull request #13116 from Luap99/reset-networks

system prune: remove all networks

cmd/podman/system/reset.go

@@ -21,7 +21,7 @@ import (
 var (
 	systemResetDescription = `Reset podman storage back to default state"
 
-  All containers will be stopped and removed, and all images, volumes and container content will be removed.
+  All containers will be stopped and removed, and all images, volumes, networks and container content will be removed.
 `
 	systemResetCommand = &cobra.Command{
 		Annotations:       map[string]string{registry.EngineMode: registry.ABIMode},
@@ -55,11 +55,11 @@ func reset(cmd *cobra.Command, args []string) {
 	// Prompt for confirmation if --force is not set
 	if !forceFlag {
 		reader := bufio.NewReader(os.Stdin)
-		fmt.Println(`
+		fmt.Println(`WARNING! This will remove:
-WARNING! This will remove:
         - all containers
         - all pods
         - all images
+        - all networks
         - all build cache`)
 		if len(listCtn) > 0 {
 			fmt.Println(`WARNING! The following external containers will be purged:`)

docs/source/markdown/podman-system-reset.1.md

@@ -7,7 +7,7 @@ podman\-system\-reset - Reset storage back to initial state
 **podman system reset** [*options*]
 
 ## DESCRIPTION
-**podman system reset** removes all pods, containers, images and volumes.
+**podman system reset** removes all pods, containers, images, networks and volumes.
 
 This command must be run **before** changing any of the following fields in the
 `containers.conf` or `storage.conf` files: `driver`, `static_dir`, `tmp_dir`
@@ -28,6 +28,17 @@ Print usage statement
 
 ## EXAMPLES
 
+```
+$ podman system reset
+WARNING! This will remove:
+        - all containers
+        - all pods
+        - all images
+        - all networks
+        - all build cache
+Are you sure you want to continue? [y/N] y
+```
+
 ### Switching rootless user from VFS driver to overlay with fuse-overlayfs
 
 If the user ran rootless containers without having the `fuse-overlayfs` program

libpod/reset.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 
 	"github.com/containers/common/libimage"
+	"github.com/containers/common/libnetwork/types"
 	"github.com/containers/podman/v4/libpod/define"
 	"github.com/containers/podman/v4/pkg/errorhandling"
 	"github.com/containers/podman/v4/pkg/rootless"
@@ -70,6 +71,22 @@ func (r *Runtime) Reset(ctx context.Context) error {
 		}
 	}
 
+	// remove all networks
+	nets, err := r.network.NetworkList()
+	if err != nil {
+		return err
+	}
+	for _, net := range nets {
+		// do not delete the default network
+		if net.Name == r.network.DefaultNetworkName() {
+			continue
+		}
+		// ignore not exists errors because of the TOCTOU problem
+		if err := r.network.NetworkRemove(net.Name); err != nil && !errors.Is(err, types.ErrNoSuchNetwork) {
+			logrus.Errorf("Removing network %s: %v", net.Name, err)
+		}
+	}
+
 	xdgRuntimeDir := filepath.Clean(os.Getenv("XDG_RUNTIME_DIR"))
 	_, prevError := r.store.Shutdown(true)
 	graphRoot := filepath.Clean(r.store.GraphRoot())

test/e2e/system_reset_test.go

@@ -38,6 +38,10 @@ var _ = Describe("podman system reset", func() {
 		SkipIfRemote("system reset not supported on podman --remote")
 		// system reset will not remove additional store images, so need to grab length
 
+		// change the network dir so that we do not conflict with other tests
+		// that would use the same network dir and cause unnecessary flakes
+		podmanTest.NetworkConfigDir = tempdir
+
 		session := podmanTest.Podman([]string{"rmi", "--force", "--all"})
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
@@ -56,16 +60,16 @@ var _ = Describe("podman system reset", func() {
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 
+		session = podmanTest.Podman([]string{"network", "create"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+
 		session = podmanTest.Podman([]string{"system", "reset", "-f"})
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 
 		Expect(session.ErrorToString()).To(Not(ContainSubstring("Failed to add pause process")))
 
-		// If remote then the API service should have exited
-		// On local tests this is a noop
-		podmanTest.StartRemoteService()
-
 		session = podmanTest.Podman([]string{"images", "-n"})
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
@@ -80,5 +84,11 @@ var _ = Describe("podman system reset", func() {
 		session.WaitWithDefaultTimeout()
 		Expect(session).Should(Exit(0))
 		Expect(session.OutputToStringArray()).To(BeEmpty())
+
+		session = podmanTest.Podman([]string{"network", "ls", "-q"})
+		session.WaitWithDefaultTimeout()
+		Expect(session).Should(Exit(0))
+		// default network should exists
+		Expect(session.OutputToStringArray()).To(HaveLen(1))
 	})
 })