terraform/command/state_mv.go

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package command
import (
"fmt"
"strings"
"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/cli"
)
// StateMvCommand is a Command implementation that shows a single resource.
type StateMvCommand struct {
Meta
StateMeta
}
func (c *StateMvCommand) Run(args []string) int {
args = c.Meta.process(args, true)
// We create two metas to track the two states
var meta1, meta2 Meta
cmdFlags := c.Meta.flagSet("state mv")
cmdFlags.StringVar(&meta1.stateOutPath, "backup", "", "backup")
cmdFlags.StringVar(&meta1.statePath, "state", DefaultStateFilename, "path")
cmdFlags.StringVar(&meta2.stateOutPath, "backup-out", "", "backup")
cmdFlags.StringVar(&meta2.statePath, "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
}
// Copy the `-state` flag for output if we weren't given a custom one
if meta2.statePath == "" {
meta2.statePath = meta1.statePath
}
// Read the from state
stateFrom, err := c.StateMeta.State(&meta1)
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if err != nil {
c.Ui.Error(fmt.Sprintf(errStateLoadingState, err))
return cli.RunResultHelp
}
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 meta2.statePath != meta1.statePath {
stateTo, err = c.StateMeta.State(&meta2)
if err != nil {
c.Ui.Error(fmt.Sprintf(errStateLoadingState, err))
return cli.RunResultHelp
}
stateToReal = stateTo.State()
if stateToReal == nil {
stateToReal = terraform.NewState()
}
}
// Filter what we're moving
filter := &terraform.StateFilter{State: stateFromReal}
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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)
// Do the actual move
if err := stateFromReal.Remove(args[0]); err != nil {
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c.Ui.Error(fmt.Sprintf(errStateMv, err))
return 1
}
if err := stateToReal.Add(args[0], args[1], add); err != nil {
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c.Ui.Error(fmt.Sprintf(errStateMv, err))
return 1
}
// Write the new state
if err := stateTo.WriteState(stateToReal); err != nil {
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c.Ui.Error(fmt.Sprintf(errStateMvPersist, err))
return 1
}
if err := stateTo.PersistState(); err != nil {
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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
// call State.Add with. The reason we do this is beacuse 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] ADDRESS ADDRESS
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Move an item in the state to another location or to a completely different
state file.
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This command is useful for module refactors (moving items into a module),
configuration refactors (moving items to a completely different or new
state file), or generally renaming of resources.
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This command creates a timestamped backup of the state on every invocation.
This can't be disabled. Due to the destructive nature of this command,
the backup is ensured by Terraform for safety reasons.
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If you're moving from one state file 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.
-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.
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-state=PATH Path to a Terraform state file to use to look
up Terraform-managed resources. By default it will
use the state "terraform.tfstate" if it exists.
-state-out=PATH Path to the destination state file to move the item
to. This defaults to the same statefile. This will
overwrite the destination state file.
`
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.`