terraform/command/taint.go

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package command
import (
"fmt"
"log"
"strings"
clistate "github.com/hashicorp/terraform/command/state"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/terraform"
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)
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// TaintCommand is a cli.Command implementation that manually taints
// a resource, marking it for recreation.
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type TaintCommand struct {
Meta
}
func (c *TaintCommand) Run(args []string) int {
args = c.Meta.process(args, false)
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var allowMissing bool
var module string
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cmdFlags := c.Meta.flagSet("taint")
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cmdFlags.BoolVar(&allowMissing, "allow-missing", false, "module")
cmdFlags.StringVar(&module, "module", "", "module")
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cmdFlags.StringVar(&c.Meta.statePath, "state", DefaultStateFilename, "path")
cmdFlags.StringVar(&c.Meta.stateOutPath, "state-out", "", "path")
cmdFlags.StringVar(&c.Meta.backupPath, "backup", "", "path")
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cmdFlags.BoolVar(&c.Meta.stateLock, "lock", true, "lock state")
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cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
// Require the one argument for the resource to taint
args = cmdFlags.Args()
if len(args) != 1 {
c.Ui.Error("The taint command expects exactly one argument.")
cmdFlags.Usage()
return 1
}
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name := args[0]
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if module == "" {
module = "root"
} else {
module = "root." + module
}
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rsk, err := terraform.ParseResourceStateKey(name)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to parse resource name: %s", err))
return 1
}
if !rsk.Mode.Taintable() {
c.Ui.Error(fmt.Sprintf("Resource '%s' cannot be tainted", name))
return 1
}
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// Load the backend
b, err := c.Backend(nil)
if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load backend: %s", err))
return 1
}
// Get the state
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st, err := b.State()
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if err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
return 1
}
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if err := st.RefreshState(); err != nil {
c.Ui.Error(fmt.Sprintf("Failed to load state: %s", err))
return 1
}
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if c.Meta.stateLock {
lockInfo := state.NewLockInfo()
lockInfo.Operation = "taint"
lockID, err := clistate.Lock(st, lockInfo, c.Ui, c.Colorize())
if err != nil {
c.Ui.Error(fmt.Sprintf("Error locking state: %s", err))
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return 1
}
defer clistate.Unlock(st, lockID, c.Ui, c.Colorize())
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}
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// Get the actual state structure
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s := st.State()
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if s.Empty() {
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if allowMissing {
return c.allowMissingExit(name, module)
}
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c.Ui.Error(fmt.Sprintf(
"The state is empty. The most common reason for this is that\n" +
"an invalid state file path was given or Terraform has never\n " +
"been run for this infrastructure. Infrastructure must exist\n" +
"for it to be tainted."))
return 1
}
// Get the proper module we want to taint
modPath := strings.Split(module, ".")
mod := s.ModuleByPath(modPath)
if mod == nil {
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if allowMissing {
return c.allowMissingExit(name, module)
}
c.Ui.Error(fmt.Sprintf(
"The module %s could not be found. There is nothing to taint.",
module))
return 1
}
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// If there are no resources in this module, it is an error
if len(mod.Resources) == 0 {
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if allowMissing {
return c.allowMissingExit(name, module)
}
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c.Ui.Error(fmt.Sprintf(
"The module %s has no resources. There is nothing to taint.",
module))
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return 1
}
// Get the resource we're looking for
rs, ok := mod.Resources[name]
if !ok {
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if allowMissing {
return c.allowMissingExit(name, module)
}
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c.Ui.Error(fmt.Sprintf(
"The resource %s couldn't be found in the module %s.",
name,
module))
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return 1
}
// Taint the resource
rs.Taint()
log.Printf("[INFO] Writing state output to: %s", c.Meta.StateOutPath())
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if err := st.WriteState(s); err != nil {
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c.Ui.Error(fmt.Sprintf("Error writing state file: %s", err))
return 1
}
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if err := st.PersistState(); err != nil {
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c.Ui.Error(fmt.Sprintf("Error writing state file: %s", err))
return 1
}
c.Ui.Output(fmt.Sprintf(
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"The resource %s in the module %s has been marked as tainted!",
name, module))
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return 0
}
func (c *TaintCommand) Help() string {
helpText := `
Usage: terraform taint [options] name
Manually mark a resource as tainted, forcing a destroy and recreate
on the next plan/apply.
This will not modify your infrastructure. This command changes your
state to mark a resource as tainted so that during the next plan or
apply, that resource will be destroyed and recreated. This command on
its own will not modify infrastructure. This command can be undone by
reverting the state backup file that is created.
Options:
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-allow-missing If specified, the command will succeed (exit code 0)
even if the resource is missing.
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-backup=path Path to backup the existing state file before
modifying. Defaults to the "-state-out" path with
".backup" extension. Set to "-" to disable backup.
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-lock=true Lock the state file when locking is supported.
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-module=path The module path where the resource lives. By
default this will be root. Child modules can be specified
by names. Ex. "consul" or "consul.vpc" (nested modules).
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-no-color If specified, output won't contain any color.
-state=path Path to read and save state (unless state-out
is specified). Defaults to "terraform.tfstate".
-state-out=path Path to write updated state file. By default, the
"-state" path will be used.
`
return strings.TrimSpace(helpText)
}
func (c *TaintCommand) Synopsis() string {
return "Manually mark a resource for recreation"
}
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func (c *TaintCommand) allowMissingExit(name, module string) int {
c.Ui.Output(fmt.Sprintf(
"The resource %s in the module %s was not found, but\n"+
"-allow-missing is set, so we're exiting successfully.",
name, module))
return 0
}