terraform/command/state_mv.go

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package command
import (
"fmt"
"strings"
"github.com/hashicorp/terraform/states"
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"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/cli"
)
// StateMvCommand is a Command implementation that shows a single resource.
type StateMvCommand struct {
StateMeta
}
func (c *StateMvCommand) Run(args []string) int {
args, err := c.Meta.process(args, true)
if err != nil {
return 1
}
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// We create two metas to track the two states
var backupPathOut, statePathOut string
cmdFlags := c.Meta.flagSet("state mv")
cmdFlags.StringVar(&c.backupPath, "backup", "-", "backup")
cmdFlags.StringVar(&c.statePath, "state", "", "path")
cmdFlags.StringVar(&backupPathOut, "backup-out", "-", "backup")
cmdFlags.StringVar(&statePathOut, "state-out", "", "path")
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if err := cmdFlags.Parse(args); err != nil {
return cli.RunResultHelp
}
args = cmdFlags.Args()
if len(args) != 2 {
c.Ui.Error("Exactly two arguments expected.\n")
return cli.RunResultHelp
}
// Read the from state
stateFrom, err := c.State()
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if err != nil {
c.Ui.Error(fmt.Sprintf(errStateLoadingState, err))
return 1
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}
if err := stateFrom.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
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return 1
}
stateFromReal := stateFrom.State()
if stateFromReal == nil {
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c.Ui.Error(fmt.Sprintf(errStateNotFound))
return 1
}
// Read the destination state
stateTo := stateFrom
stateToReal := stateFromReal
if statePathOut != "" {
c.statePath = statePathOut
c.backupPath = backupPathOut
stateTo, err = c.State()
if err != nil {
c.Ui.Error(fmt.Sprintf(errStateLoadingState, err))
return 1
}
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if err := stateTo.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
return 1
}
stateToReal = stateTo.State()
if stateToReal == nil {
stateToReal = states.NewState()
}
}
c.Ui.Error("state mv command not yet updated for new state types")
/*
// Filter what we're moving
filter := &terraform.StateFilter{State: stateFromReal}
results, err := filter.Filter(args[0])
if err != nil {
c.Ui.Error(fmt.Sprintf(errStateMv, err))
return cli.RunResultHelp
}
if len(results) == 0 {
c.Ui.Output(fmt.Sprintf("Item to move doesn't exist: %s", args[0]))
return 1
}
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// Get the item to add to the state
add := c.addableResult(results)
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// Do the actual move
if err := stateFromReal.Remove(args[0]); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMv, err))
return 1
}
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if err := stateToReal.Add(args[0], args[1], add); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMv, err))
return 1
}
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// Write the new state
if err := stateTo.WriteState(stateToReal); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMvPersist, err))
return 1
}
if err := stateTo.PersistState(); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMvPersist, err))
return 1
}
// Write the old state if it is different
if stateTo != stateFrom {
if err := stateFrom.WriteState(stateFromReal); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMvPersist, err))
return 1
}
if err := stateFrom.PersistState(); err != nil {
c.Ui.Error(fmt.Sprintf(errStateMvPersist, err))
return 1
}
}
*/
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c.Ui.Output(fmt.Sprintf(
"Moved %s to %s", args[0], args[1]))
return 0
}
// addableResult takes the result from a filter operation and returns what to
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// call State.Add with. The reason we do this is because in the module case
// we must add the list of all modules returned versus just the root module.
func (c *StateMvCommand) addableResult(results []*terraform.StateFilterResult) interface{} {
switch v := results[0].Value.(type) {
case *terraform.ModuleState:
// If a module state then we should add the full list of modules
result := []*terraform.ModuleState{v}
if len(results) > 1 {
for _, r := range results[1:] {
if ms, ok := r.Value.(*terraform.ModuleState); ok {
result = append(result, ms)
}
}
}
return result
case *terraform.ResourceState:
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// If a resource state with more than one result, it has a multi-count
// and we need to add all of them.
result := []*terraform.ResourceState{v}
if len(results) > 1 {
for _, r := range results[1:] {
rs, ok := r.Value.(*terraform.ResourceState)
if !ok {
continue
}
if rs.Type == v.Type {
result = append(result, rs)
}
}
}
// If we only have one item, add it directly
if len(result) == 1 {
return result[0]
}
return result
default:
// By default just add the first result
return v
}
}
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func (c *StateMvCommand) Help() string {
helpText := `
Usage: terraform state mv [options] SOURCE DESTINATION
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This command will move an item matched by the address given to the
destination address. This command can also move to a destination address
in a completely different state file.
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This can be used for simple resource renaming, moving items to and from
a module, moving entire modules, and more. And because this command can also
move data to a completely new state, it can also be used for refactoring
one configuration into multiple separately managed Terraform configurations.
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This command will output a backup copy of the state prior to saving any
changes. The backup cannot be disabled. Due to the destructive nature
of this command, backups are required.
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If you're moving an item to a different state file, a backup will be created
for each state file.
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Options:
-backup=PATH Path where Terraform should write the backup for the original
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state. This can't be disabled. If not set, Terraform
will write it to the same path as the statefile with
a ".backup" extension.
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-backup-out=PATH Path where Terraform should write the backup for the destination
state. This can't be disabled. If not set, Terraform
will write it to the same path as the destination state
file with a backup extension. This only needs
to be specified if -state-out is set to a different path
than -state.
-state=PATH Path to the source state file. Defaults to the configured
backend, or "terraform.tfstate"
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-state-out=PATH Path to the destination state file to write to. If this
isn't specified, the source state file will be used. This
can be a new or existing path.
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`
return strings.TrimSpace(helpText)
}
func (c *StateMvCommand) Synopsis() string {
return "Move an item in the state"
}
const errStateMv = `Error moving state: %[1]s
Please ensure your addresses and state paths are valid. No
state was persisted. Your existing states are untouched.`
const errStateMvPersist = `Error saving the state: %s
The state wasn't saved properly. If the error happening after a partial
write occurred, a backup file will have been created. Otherwise, the state
is in the same state it was when the operation started.`