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clone.go
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clone.go
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package machine
import (
"context"
"fmt"
"strings"
"time"
"github.com/google/shlex"
"github.com/samber/lo"
"github.com/spf13/cobra"
"github.com/superfly/flyctl/api"
"github.com/superfly/flyctl/client"
"github.com/superfly/flyctl/flaps"
"github.com/superfly/flyctl/internal/appconfig"
"github.com/superfly/flyctl/internal/command"
"github.com/superfly/flyctl/internal/flag"
mach "github.com/superfly/flyctl/internal/machine"
"github.com/superfly/flyctl/internal/watch"
"github.com/superfly/flyctl/iostreams"
"github.com/superfly/flyctl/terminal"
"golang.org/x/exp/slices"
)
func newClone() *cobra.Command {
const (
short = "Clone a Fly machine"
long = short + "\n"
usage = "clone <machine_id>"
)
cmd := command.New(usage, short, long, runMachineClone,
command.RequireSession,
command.RequireAppName,
command.LoadAppConfigIfPresent,
)
cmd.Args = cobra.RangeArgs(0, 1)
flag.Add(
cmd,
flag.App(),
flag.AppConfig(),
selectFlag,
flag.String{
Name: "region",
Description: "Target region for the new machine",
},
flag.String{
Name: "name",
Description: "Optional name for the new machine",
},
flag.String{
Name: "from-snapshot",
Description: "Clone attached volumes and restore from snapshot, use 'last' for most recent snapshot. The default is an empty volume",
},
flag.String{
Name: "attach-volume",
Description: "Existing volume to attach to the new machine in the form of <volume_id>[:/path/inside/machine]",
},
flag.String{
Name: "process-group",
Description: "For machines that are part of Fly Apps v2 does a regular clone and changes the process group to what is specified here",
},
flag.String{
Name: "override-cmd",
Description: "Set CMD on the new machine to this value",
},
flag.Bool{
Name: "clear-cmd",
Description: "Set empty CMD on the new machine so it uses default CMD for the image",
},
flag.Bool{
Name: "clear-auto-destroy",
Description: "Disable auto destroy setting on new machine",
},
flag.StringSlice{
Name: "standby-for",
Description: "Comma separated list of machine ids to watch for. You can use '--standby-for=source' to create a standby for the cloned machine",
},
)
return cmd
}
func runMachineClone(ctx context.Context) (err error) {
var (
out = iostreams.FromContext(ctx).Out
appName = appconfig.NameFromContext(ctx)
io = iostreams.FromContext(ctx)
colorize = io.ColorScheme()
client = client.FromContext(ctx).API()
)
app, err := client.GetAppCompact(ctx, appName)
if err != nil {
return err
}
machineID := flag.FirstArg(ctx)
haveMachineID := len(flag.Args(ctx)) > 0
source, ctx, err := selectOneMachine(ctx, app, machineID, haveMachineID)
if err != nil {
return err
}
flapsClient := flaps.FromContext(ctx)
region := flag.GetString(ctx, "region")
if region == "" {
region = source.Region
}
fmt.Fprintf(out, "Cloning machine %s into region %s\n", colorize.Bold(source.ID), colorize.Bold(region))
targetConfig := source.Config
if targetProcessGroup := flag.GetString(ctx, "process-group"); targetProcessGroup != "" {
appConfig, err := getAppConfig(ctx, appName)
if err != nil {
return fmt.Errorf("failed to get app config: %w", err)
}
if !slices.Contains(appConfig.ProcessNames(), targetProcessGroup) {
return fmt.Errorf("process group %s is not present in app configuration, add a [processes] section to fly.toml", targetProcessGroup)
}
if targetProcessGroup == api.MachineProcessGroupFlyAppReleaseCommand {
return fmt.Errorf("invalid process group %s, %s is reserved for internal use", targetProcessGroup, api.MachineProcessGroupFlyAppReleaseCommand)
}
if targetConfig.Metadata == nil {
targetConfig.Metadata = make(map[string]string)
}
targetConfig.Metadata[api.MachineConfigMetadataKeyFlyProcessGroup] = targetProcessGroup
terminal.Infof("Setting process group to %s for new machine and updating cmd, services, and checks\n", targetProcessGroup)
mConfig, err := appConfig.ToMachineConfig(targetProcessGroup, nil)
if err != nil {
return fmt.Errorf("failed to get process group config: %w", err)
}
targetConfig.Init.Cmd = mConfig.Init.Cmd
targetConfig.Services = mConfig.Services
targetConfig.Checks = mConfig.Checks
}
targetConfig.Image = source.FullImageRef()
if flag.GetBool(ctx, "clear-cmd") {
targetConfig.Init.Cmd = make([]string, 0)
} else if targetCmd := flag.GetString(ctx, "override-cmd"); targetCmd != "" {
theCmd, err := shlex.Split(targetCmd)
if err != nil {
return fmt.Errorf("error splitting cmd: %w", err)
}
targetConfig.Init.Cmd = theCmd
}
if flag.GetBool(ctx, "clear-auto-destroy") {
targetConfig.AutoDestroy = false
}
if targetConfig.AutoDestroy {
fmt.Fprintf(io.Out, "Auto destroy enabled and will destroy machine on exit. Use --clear-auto-destroy to remove this setting.\n")
}
var volID string
if volumeInfo := flag.GetString(ctx, "attach-volume"); volumeInfo != "" {
splitVolumeInfo := strings.Split(volumeInfo, ":")
volID = splitVolumeInfo[0]
if len(source.Config.Mounts) > 1 {
return fmt.Errorf("Can't use --attach-volume for machines with more than 1 volume.")
} else if len(source.Config.Mounts) == 0 && len(splitVolumeInfo) != 2 {
return fmt.Errorf("Please specify a mount path on '%s' using <volume_id>:/path/inside/machine", volumeInfo)
}
// in case user passed a mount path
if len(splitVolumeInfo) == 2 {
// patches the source config so the loop below attaches the volume on the passed mount path
if len(source.Config.Mounts) == 0 {
source.Config.Mounts = []api.MachineMount{
{
Path: splitVolumeInfo[1],
},
}
} else if len(source.Config.Mounts) == 1 {
fmt.Fprintf(io.Out, "Info: --attach-volume is overriding previous mount point from `%s` to `%s`.\n", source.Config.Mounts[0].Path, splitVolumeInfo[1])
source.Config.Mounts[0].Path = splitVolumeInfo[1]
}
}
}
for _, mnt := range source.Config.Mounts {
var vol *api.Volume
if volID != "" {
fmt.Fprintf(out, "Attaching existing volume %s\n", colorize.Bold(volID))
vol, err = client.GetVolume(ctx, volID)
if err != nil {
return fmt.Errorf("could not get existing volume: %w", err)
}
if vol.IsAttached() {
return fmt.Errorf("volume %s is already attached to a machine", vol.ID)
}
} else {
var snapshotID *string
switch snapID := flag.GetString(ctx, "from-snapshot"); snapID {
case "last":
snapshots, err := client.GetVolumeSnapshots(ctx, mnt.Volume)
if err != nil {
return err
}
if len(snapshots) > 0 {
snapshot := lo.MaxBy(snapshots, func(i, j api.Snapshot) bool { return i.CreatedAt.After(j.CreatedAt) })
snapshotID = &snapshot.ID
fmt.Fprintf(out, "Creating new volume from snapshot %s of %s\n", colorize.Bold(*snapshotID), colorize.Bold(mnt.Volume))
} else {
fmt.Fprintf(out, "No snapshot for source volume %s, the new volume will start empty\n", colorize.Bold(mnt.Volume))
snapshotID = nil
}
case "":
fmt.Fprintf(out, "Volume '%s' will start empty\n", colorize.Bold(mnt.Name))
default:
snapshotID = &snapID
fmt.Fprintf(io.Out, "Creating new volume from snapshot: %s\n", colorize.Bold(*snapshotID))
}
volInput := api.CreateVolumeInput{
AppID: app.ID,
Name: mnt.Name,
Region: region,
SizeGb: mnt.SizeGb,
Encrypted: mnt.Encrypted,
SnapshotID: snapshotID,
RequireUniqueZone: false,
}
vol, err = client.CreateVolume(ctx, volInput)
if err != nil {
return err
}
}
targetConfig.Mounts = []api.MachineMount{
{
Volume: vol.ID,
Path: mnt.Path,
},
}
}
// Standby machine
if flag.IsSpecified(ctx, "standby-for") {
standbys := flag.GetStringSlice(ctx, "standby-for")
for idx := range standbys {
if standbys[idx] == "source" {
standbys[idx] = source.ID
}
}
targetConfig.Standbys = lo.Ternary(len(standbys) > 0, standbys, nil)
}
input := api.LaunchMachineInput{
Name: flag.GetString(ctx, "name"),
Region: region,
Config: targetConfig,
SkipLaunch: len(targetConfig.Standbys) > 0,
}
fmt.Fprintf(out, "Provisioning a new machine with image %s...\n", source.Config.Image)
launchedMachine, err := flapsClient.Launch(ctx, input)
if err != nil {
return err
}
fmt.Fprintf(out, " Machine %s has been created...\n", colorize.Bold(launchedMachine.ID))
if !input.SkipLaunch {
fmt.Fprintf(out, " Waiting for machine %s to start...\n", colorize.Bold(launchedMachine.ID))
// wait for a machine to be started
err = mach.WaitForStartOrStop(ctx, launchedMachine, "start", time.Minute*5)
if err != nil {
return err
}
if err = watch.MachinesChecks(ctx, []*api.Machine{launchedMachine}); err != nil {
return fmt.Errorf("error while watching health checks: %w", err)
}
}
fmt.Fprintf(out, "Machine has been successfully cloned!\n")
return
}
func getAppConfig(ctx context.Context, appName string) (*appconfig.Config, error) {
cfg := appconfig.ConfigFromContext(ctx)
if cfg == nil {
terminal.Debug("no local app config detected; fetching from backend ...")
cfg, err := appconfig.FromRemoteApp(ctx, appName)
if err != nil {
return nil, fmt.Errorf("failed fetching existing app config: %w", err)
}
return cfg, nil
}
err, _ := cfg.Validate(ctx)
if err != nil {
return nil, err
}
return cfg, nil
}