terraform/command/plan.go

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package command
import (
"fmt"
"strings"
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"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/plans"
"github.com/hashicorp/terraform/tfdiags"
)
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// PlanCommand is a Command implementation that compares a Terraform
// configuration to an actual infrastructure and shows the differences.
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type PlanCommand struct {
Meta
}
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func (c *PlanCommand) Run(args []string) int {
var destroy, refresh, detailed bool
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var outPath string
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args = c.Meta.process(args)
cmdFlags := c.Meta.extendedFlagSet("plan")
cmdFlags.BoolVar(&destroy, "destroy", false, "destroy")
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cmdFlags.BoolVar(&refresh, "refresh", true, "refresh")
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cmdFlags.StringVar(&outPath, "out", "", "path")
cmdFlags.IntVar(&c.Meta.parallelism, "parallelism", DefaultParallelism, "parallelism")
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cmdFlags.StringVar(&c.Meta.statePath, "state", "", "path")
cmdFlags.BoolVar(&detailed, "detailed-exitcode", false, "detailed-exitcode")
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cmdFlags.BoolVar(&c.Meta.stateLock, "lock", true, "lock state")
cmdFlags.DurationVar(&c.Meta.stateLockTimeout, "lock-timeout", 0, "lock timeout")
cmdFlags.Usage = func() { c.Ui.Error(c.Help()) }
if err := cmdFlags.Parse(args); err != nil {
return 1
}
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configPath, err := ModulePath(cmdFlags.Args())
if err != nil {
c.Ui.Error(err.Error())
return 1
}
// Check for user-supplied plugin path
if c.pluginPath, err = c.loadPluginPath(); err != nil {
c.Ui.Error(fmt.Sprintf("Error loading plugin path: %s", err))
return 1
}
// Check if the path is a plan, which is not permitted
planFileReader, err := c.PlanFile(configPath)
if err != nil {
c.Ui.Error(err.Error())
return 1
}
if planFileReader != nil {
c.showDiagnostics(tfdiags.Sourceless(
tfdiags.Error,
"Invalid configuration directory",
fmt.Sprintf("Cannot pass a saved plan file to the 'terraform plan' command. To apply a saved plan, use: terraform apply %s", configPath),
))
return 1
}
var diags tfdiags.Diagnostics
var backendConfig *configs.Backend
var configDiags tfdiags.Diagnostics
backendConfig, configDiags = c.loadBackendConfig(configPath)
diags = diags.Append(configDiags)
if configDiags.HasErrors() {
c.showDiagnostics(diags)
return 1
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}
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// Load the backend
b, backendDiags := c.Backend(&BackendOpts{
Config: backendConfig,
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})
diags = diags.Append(backendDiags)
if backendDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
// Emit any diagnostics we've accumulated before we delegate to the
// backend, since the backend will handle its own diagnostics internally.
c.showDiagnostics(diags)
diags = nil
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// Build the operation
opReq := c.Operation(b)
opReq.ConfigDir = configPath
opReq.Destroy = destroy
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opReq.PlanOutPath = outPath
opReq.PlanRefresh = refresh
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opReq.Type = backend.OperationTypePlan
opReq.ConfigLoader, err = c.initConfigLoader()
if err != nil {
c.showDiagnostics(err)
return 1
}
{
var moreDiags tfdiags.Diagnostics
opReq.Variables, moreDiags = c.collectVariableValues()
diags = diags.Append(moreDiags)
if moreDiags.HasErrors() {
c.showDiagnostics(diags)
return 1
}
}
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// c.Backend above has a non-obvious side-effect of also populating
// c.backendState, which is the state-shaped formulation of the effective
// backend configuration after evaluation of the backend configuration.
// We will in turn adapt that to a plans.Backend to include in a plan file
// if opReq.PlanOutPath was set to a non-empty value above.
//
// FIXME: It's ugly to be doing this inline here, but it's also not really
// clear where would be better to do it. In future we should find a better
// home for this logic, and ideally also stop depending on the side-effect
// of c.Backend setting c.backendState.
{
// This is not actually a state in the usual sense, but rather a
// representation of part of the current working directory's
// "configuration state".
backendPseudoState := c.backendState
if backendPseudoState == nil {
// Should never happen if c.Backend is behaving properly.
diags = diags.Append(fmt.Errorf("Backend initialization didn't produce resolved configuration (This is a bug in Terraform)"))
c.showDiagnostics(diags)
return 1
}
var backendForPlan plans.Backend
backendForPlan.Type = backendPseudoState.Type
workspace, err := c.Workspace()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error selecting workspace: %s", err))
return 1
}
backendForPlan.Workspace = workspace
// Configuration is a little more awkward to handle here because it's
// stored in state as raw JSON but we need it as a plans.DynamicValue
// to save it in the state. To do that conversion we need to know the
// configuration schema of the backend.
configSchema := b.ConfigSchema()
config, err := backendPseudoState.Config(configSchema)
if err != nil {
// This means that the stored settings don't conform to the current
// schema, which could either be because we're reading something
// created by an older version that is no longer compatible, or
// because the user manually tampered with the stored config.
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Invalid backend initialization",
fmt.Sprintf("The backend configuration for this working directory is not valid: %s.\n\nIf you have recently upgraded Terraform, you may need to re-run \"terraform init\" to re-initialize this working directory.", err),
))
c.showDiagnostics(diags)
return 1
}
configForPlan, err := plans.NewDynamicValue(config, configSchema.ImpliedType())
if err != nil {
// This should never happen, since we've just decoded this value
// using the same schema.
diags = diags.Append(fmt.Errorf("Failed to encode backend configuration to store in plan: %s", err))
c.showDiagnostics(diags)
return 1
}
backendForPlan.Config = configForPlan
}
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// Perform the operation
op, err := c.RunOperation(b, opReq)
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if err != nil {
c.showDiagnostics(err)
return 1
}
if op.Result != backend.OperationSuccess {
return op.Result.ExitStatus()
}
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if detailed && !op.PlanEmpty {
return 2
}
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return op.Result.ExitStatus()
}
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func (c *PlanCommand) Help() string {
helpText := `
Usage: terraform plan [options] [DIR]
Generates a speculative execution plan, showing what actions Terraform
would take to apply the current configuration. This command will not
actually perform the planned actions.
You can optionally save the plan to a file, which you can then pass to
the "apply" command to perform exactly the actions described in the plan.
Options:
-compact-warnings If Terraform produces any warnings that are not
accompanied by errors, show them in a more compact form
that includes only the summary messages.
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-destroy If set, a plan will be generated to destroy all resources
managed by the given configuration and state.
-detailed-exitcode Return detailed exit codes when the command exits. This
will change the meaning of exit codes to:
0 - Succeeded, diff is empty (no changes)
1 - Errored
2 - Succeeded, there is a diff
-input=true Ask for input for variables if not directly set.
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-lock=true Lock the state file when locking is supported.
-lock-timeout=0s Duration to retry a state lock.
-no-color If specified, output won't contain any color.
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-out=path Write a plan file to the given path. This can be used as
input to the "apply" command.
-parallelism=n Limit the number of concurrent operations. Defaults to 10.
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-refresh=true Update state prior to checking for differences.
-state=statefile 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.
-target=resource Resource to target. Operation will be limited to this
resource and its dependencies. This flag can be used
multiple times.
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-var 'foo=bar' Set a variable in the Terraform configuration. This
flag can be set multiple times.
-var-file=foo Set variables in the Terraform configuration from
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a file. If "terraform.tfvars" or any ".auto.tfvars"
files are present, they will be automatically loaded.
`
return strings.TrimSpace(helpText)
}
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func (c *PlanCommand) Synopsis() string {
return "Show changes required by the current configuration"
}