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move.go
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move.go
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package main
import (
"fmt"
"strings"
"github.com/spf13/cobra"
cli "github.com/lxc/incus/v6/internal/cmd"
"github.com/lxc/incus/v6/internal/i18n"
"github.com/lxc/incus/v6/shared/api"
)
type cmdMove struct {
global *cmdGlobal
flagNoProfiles bool
flagProfile []string
flagConfig []string
flagInstanceOnly bool
flagDevice []string
flagMode string
flagStateless bool
flagStorage string
flagTarget string
flagTargetProject string
flagAllowInconsistent bool
}
func (c *cmdMove) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("move", i18n.G("[<remote>:]<instance> [<remote>:][<instance>]"))
cmd.Aliases = []string{"mv"}
cmd.Short = i18n.G("Move instances within or in between servers")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Move instances within or in between servers
Transfer modes (--mode):
- pull: Target server pulls the data from the source server (source must listen on network)
- push: Source server pushes the data to the target server (target must listen on network)
- relay: The CLI connects to both source and server and proxies the data (both source and target must listen on network)
The pull transfer mode is the default as it is compatible with all server versions.
`))
cmd.Example = cli.FormatSection("", i18n.G(
`incus move [<remote>:]<source instance> [<remote>:][<destination instance>] [--instance-only]
Move an instance between two hosts, renaming it if destination name differs.
incus move <old name> <new name> [--instance-only]
Rename a local instance.
incus move <instance>/<old snapshot name> <instance>/<new snapshot name>
Rename a snapshot.`))
cmd.RunE = c.Run
cmd.Flags().StringArrayVarP(&c.flagConfig, "config", "c", nil, i18n.G("Config key/value to apply to the target instance")+"``")
cmd.Flags().StringArrayVarP(&c.flagDevice, "device", "d", nil, i18n.G("New key/value to apply to a specific device")+"``")
cmd.Flags().StringArrayVarP(&c.flagProfile, "profile", "p", nil, i18n.G("Profile to apply to the target instance")+"``")
cmd.Flags().BoolVar(&c.flagNoProfiles, "no-profiles", false, i18n.G("Unset all profiles on the target instance"))
cmd.Flags().BoolVar(&c.flagInstanceOnly, "instance-only", false, i18n.G("Move the instance without its snapshots"))
cmd.Flags().StringVar(&c.flagMode, "mode", moveDefaultMode, i18n.G("Transfer mode. One of pull, push or relay.")+"``")
cmd.Flags().BoolVar(&c.flagStateless, "stateless", false, i18n.G("Copy a stateful instance stateless"))
cmd.Flags().StringVarP(&c.flagStorage, "storage", "s", "", i18n.G("Storage pool name")+"``")
cmd.Flags().StringVar(&c.flagTarget, "target", "", i18n.G("Cluster member name")+"``")
cmd.Flags().StringVar(&c.flagTargetProject, "target-project", "", i18n.G("Copy to a project different from the source")+"``")
cmd.Flags().BoolVar(&c.flagAllowInconsistent, "allow-inconsistent", false, i18n.G("Ignore copy errors for volatile files"))
cmd.ValidArgsFunction = func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
if len(args) == 0 {
return c.global.cmpInstances(toComplete)
}
if len(args) == 1 {
return c.global.cmpRemotes(false)
}
return nil, cobra.ShellCompDirectiveNoFileComp
}
return cmd
}
func (c *cmdMove) Run(cmd *cobra.Command, args []string) error {
conf := c.global.conf
// Quick checks.
if c.flagTarget == "" && c.flagTargetProject == "" && c.flagStorage == "" {
exit, err := c.global.CheckArgs(cmd, args, 2, 2)
if exit {
return err
}
} else {
exit, err := c.global.CheckArgs(cmd, args, 1, 2)
if exit {
return err
}
}
// Parse the mode
mode := moveDefaultMode
if c.flagMode != "" {
mode = c.flagMode
}
sourceRemote, sourceName, err := conf.ParseRemote(args[0])
if err != nil {
return err
}
destRemote := sourceRemote
destName := ""
if len(args) == 2 {
var err error
destRemote, destName, err = conf.ParseRemote(args[1])
if err != nil {
return err
}
}
// As an optimization, if the source and destination are the same, do
// this via a simple rename. This only works for instances that aren't
// running, instances that are running should be live migrated (of
// course, this changing of hostname isn't supported right now, so this
// simply won't work).
if sourceRemote == destRemote && c.flagTarget == "" && c.flagStorage == "" && c.flagTargetProject == "" {
if c.flagConfig != nil || c.flagDevice != nil || c.flagProfile != nil || c.flagNoProfiles {
return fmt.Errorf(i18n.G("Can't override configuration or profiles in local rename"))
}
source, err := conf.GetInstanceServer(sourceRemote)
if err != nil {
return err
}
// Instance rename
op, err := source.RenameInstance(sourceName, api.InstancePost{Name: destName})
if err != nil {
return err
}
return op.Wait()
}
sourceResource := args[0]
destResource := sourceResource
if len(args) == 2 {
destResource = args[1]
}
stateful := !c.flagStateless
isServerSide := func() bool {
// Check if same source and destination.
if sourceRemote != destRemote {
return false
}
// Check if asked for specific client mode.
if c.flagMode != moveDefaultMode {
return false
}
// Connect to the server.
source, err := conf.GetInstanceServer(sourceRemote)
if err != nil {
return false
}
// Check if override is requested with a server lacking support.
if !source.HasExtension("instance_move_config") {
if len(c.flagConfig) > 0 {
return false
}
if len(c.flagDevice) > 0 {
return false
}
if len(c.flagProfile) > 0 {
return false
}
}
// Check if server supports moving pools.
if c.flagStorage != "" && !source.HasExtension("instance_pool_move") {
return false
}
// Check if server supports moving projects.
if c.flagTargetProject != "" && !source.HasExtension("instance_project_move") {
return false
}
return true
}()
// Support for server-side move in clusters.
if isServerSide {
return c.moveInstance(sourceResource, destResource, stateful)
}
cpy := cmdCopy{}
cpy.global = c.global
cpy.flagTarget = c.flagTarget
cpy.flagTargetProject = c.flagTargetProject
cpy.flagConfig = c.flagConfig
cpy.flagDevice = c.flagDevice
cpy.flagProfile = c.flagProfile
cpy.flagNoProfiles = c.flagNoProfiles
cpy.flagAllowInconsistent = c.flagAllowInconsistent
instanceOnly := c.flagInstanceOnly
// A move is just a copy followed by a delete; however, we want to
// keep the volatile entries around since we are moving the instance.
err = cpy.copyInstance(conf, sourceResource, destResource, true, -1, stateful, instanceOnly, mode, c.flagStorage, true)
if err != nil {
return err
}
del := cmdDelete{global: c.global}
del.flagForce = true
del.flagForceProtected = true
err = del.Run(cmd, args[:1])
if err != nil {
return fmt.Errorf(i18n.G("Failed to delete original instance after copying it: %w"), err)
}
return nil
}
// Move an instance between pools and projects using special POST /instances/<name> API.
func (c *cmdMove) moveInstance(sourceResource string, destResource string, stateful bool) error {
conf := c.global.conf
// Parse the source.
sourceRemote, sourceName, err := conf.ParseRemote(sourceResource)
if err != nil {
return err
}
// Parse the destination.
_, destName, err := conf.ParseRemote(destResource)
if err != nil {
return err
}
// Make sure we have an instance or snapshot name.
if sourceName == "" {
return fmt.Errorf(i18n.G("You must specify a source instance name"))
}
// The destination name is optional.
if destName == "" {
destName = sourceName
}
// Connect to the source host.
source, err := conf.GetInstanceServer(sourceRemote)
if err != nil {
return fmt.Errorf(i18n.G("Failed to connect to cluster member: %w"), err)
}
if !source.IsClustered() && c.flagTarget != "" {
return fmt.Errorf(i18n.G("--target can only be used with clusters"))
}
// Set the target if specified.
if c.flagTarget != "" {
source = source.UseTarget(c.flagTarget)
}
// Pass the new pool to the migration API.
req := api.InstancePost{
Name: destName,
Migration: true,
InstanceOnly: c.flagInstanceOnly,
Pool: c.flagStorage,
Project: c.flagTargetProject,
Live: stateful,
}
// Override profiles.
var profiles *[]string
if len(c.flagProfile) > 0 {
profiles = &c.flagProfile
} else if c.flagNoProfiles {
profiles = &[]string{}
}
if profiles != nil {
req.Profiles = *profiles
}
// Override config.
if len(c.flagConfig) > 0 {
req.Config = map[string]string{}
for _, entry := range c.flagConfig {
key, value, found := strings.Cut(entry, "=")
if !found {
return fmt.Errorf(i18n.G("Bad key=value pair: %q"), entry)
}
req.Config[key] = value
}
}
// Override devices.
if len(c.flagDevice) > 0 {
req.Devices = map[string]map[string]string{}
// Parse the overrides.
deviceMap, err := parseDeviceOverrides(c.flagDevice)
if err != nil {
return err
}
// Fetch the current isntance.
inst, _, err := source.GetInstance(sourceName)
if err != nil {
return err
}
for devName, dev := range deviceMap {
fullDev := inst.ExpandedDevices[devName]
for k, v := range dev {
fullDev[k] = v
}
req.Devices[devName] = fullDev
}
}
// Move the instance.
op, err := source.MigrateInstance(sourceName, req)
if err != nil {
return fmt.Errorf(i18n.G("Migration API failure: %w"), err)
}
// Watch the background operation
progress := cli.ProgressRenderer{
Format: i18n.G("Transferring instance: %s"),
Quiet: c.global.flagQuiet,
}
_, err = op.AddHandler(progress.UpdateOp)
if err != nil {
progress.Done("")
return err
}
// Wait for the move to complete
err = cli.CancelableWait(op, &progress)
if err != nil {
progress.Done("")
return fmt.Errorf(i18n.G("Migration operation failure: %w"), err)
}
progress.Done("")
return nil
}
// Default migration mode when moving an instance.
const moveDefaultMode = "pull"