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create.go
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create.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file expect in compliance with the License.
package create
import (
"context"
"fmt"
"net"
"github.com/MakeNowJust/heredoc"
"github.com/spf13/cobra"
"github.com/vishvananda/netlink"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
networkapi "kraftkit.sh/api/network/v1alpha1"
"kraftkit.sh/cmdfactory"
"kraftkit.sh/iostreams"
"kraftkit.sh/machine/network"
)
type CreateOptions struct {
Driver string `noattribute:"true"`
Network string `long:"network" short:"n" usage:"Set the gateway IP address and the subnet of the network in CIDR format."`
}
// Create a new local machine network.
func Create(ctx context.Context, opts *CreateOptions, args ...string) error {
if opts == nil {
opts = &CreateOptions{}
}
return opts.Run(ctx, args)
}
func NewCmd() *cobra.Command {
cmd, err := cmdfactory.New(&CreateOptions{}, cobra.Command{
Short: "Create a new machine network",
Use: "create [FLAGS] NETWORK",
Aliases: []string{"add"},
Args: cobra.ExactArgs(1),
Long: "Create a new machine network.",
Example: heredoc.Doc(`
# Create a new machine network
$ kraft network create my-network --network 133.37.0.1/12
`),
Annotations: map[string]string{
cmdfactory.AnnotationHelpGroup: "net",
},
})
if err != nil {
panic(err)
}
return cmd
}
func (opts *CreateOptions) Pre(cmd *cobra.Command, _ []string) error {
opts.Driver = cmd.Flag("driver").Value.String()
return nil
}
func (opts *CreateOptions) Run(ctx context.Context, args []string) error {
var err error
strategy, ok := network.Strategies()[opts.Driver]
if !ok {
return fmt.Errorf("unsupported network driver strategy: %v (contributions welcome!)", opts.Driver)
}
controller, err := strategy.NewNetworkV1alpha1(ctx)
if err != nil {
return err
}
if opts.Network == "" {
existingNetworks, err := controller.List(ctx, &networkapi.NetworkList{})
if err != nil {
return err
}
freeNetwork, err := network.FindFreeNetwork(network.DefaultNetworkPool, existingNetworks)
if err != nil {
return err
}
opts.Network = freeNetwork.String()
}
addr, err := netlink.ParseAddr(opts.Network)
if err != nil {
return err
}
if _, err := controller.Create(ctx, &networkapi.Network{
ObjectMeta: metav1.ObjectMeta{
Name: args[0],
},
Spec: networkapi.NetworkSpec{
Gateway: addr.IP.String(),
Netmask: net.IP(addr.Mask).String(),
},
}); err != nil {
return err
}
fmt.Fprintln(iostreams.G(ctx).Out, args[0])
return nil
}