add network prune

add the ability to prune unused cni networks.  filters are not implemented
but included both compat and podman api endpoints.

Fixes :#8673

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

1 files changed, 82 insertions, 0 deletions

diff --git a/cmd/podman/networks/prune.go b/cmd/podman/networks/prune.go
new file mode 100644
index 000000000..d6c7d3a7f
--- /dev/null
+++ b/cmd/podman/networks/prune.go
@@ -0,0 +1,82 @@
+package network
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/containers/podman/v2/cmd/podman/common"
+	"github.com/containers/podman/v2/cmd/podman/registry"
+	"github.com/containers/podman/v2/cmd/podman/utils"
+	"github.com/containers/podman/v2/cmd/podman/validate"
+	"github.com/containers/podman/v2/pkg/domain/entities"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+var (
+	networkPruneDescription = `Prune unused networks`
+	networkPruneCommand     = &cobra.Command{
+		Use:               "prune [options]",
+		Short:             "network prune",
+		Long:              networkPruneDescription,
+		RunE:              networkPrune,
+		Example:           `podman network prune`,
+		Args:              validate.NoArgs,
+		ValidArgsFunction: common.AutocompleteNetworks,
+	}
+)
+
+var (
+	networkPruneOptions entities.NetworkPruneOptions
+	force               bool
+)
+
+func networkPruneFlags(flags *pflag.FlagSet) {
+	//TODO: Not implemented but for future reference
+	//flags.StringSliceVar(&networkPruneOptions.Filters,"filters", []string{}, "provide filter values (e.g. 'until=<timestamp>')")
+	flags.BoolVarP(&force, "force", "f", false, "do not prompt for confirmation")
+}
+
+func init() {
+	registry.Commands = append(registry.Commands, registry.CliCommand{
+		Mode:    []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
+		Command: networkPruneCommand,
+		Parent:  networkCmd,
+	})
+	flags := networkPruneCommand.Flags()
+	networkPruneFlags(flags)
+}
+
+func networkPrune(cmd *cobra.Command, _ []string) error {
+	var (
+		errs utils.OutputErrors
+	)
+	if !force {
+		reader := bufio.NewReader(os.Stdin)
+		fmt.Println("WARNING! This will remove all networks not used by at least one container.")
+		fmt.Print("Are you sure you want to continue? [y/N] ")
+		answer, err := reader.ReadString('\n')
+		if err != nil {
+			return err
+		}
+		if strings.ToLower(answer)[0] != 'y' {
+			return nil
+		}
+	}
+	responses, err := registry.ContainerEngine().NetworkPrune(registry.Context(), networkPruneOptions)
+	if err != nil {
+		setExitCode(err)
+		return err
+	}
+	for _, r := range responses {
+		if r.Error == nil {
+			fmt.Println(r.Name)
+		} else {
+			setExitCode(r.Error)
+			errs = append(errs, r.Error)
+		}
+	}
+	return errs.PrintErrors()
+}