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/config"
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"github.com/hashicorp/terraform/config/module"
"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
var moduleDepth int
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args, err := c.Meta.process(args, true)
if err != nil {
return 1
}
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cmdFlags := c.Meta.flagSet("plan")
cmdFlags.BoolVar(&destroy, "destroy", false, "destroy")
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cmdFlags.BoolVar(&refresh, "refresh", true, "refresh")
c.addModuleDepthFlag(cmdFlags, &moduleDepth)
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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
}
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// Check if the path is a plan
plan, err := c.Plan(configPath)
if err != nil {
c.Ui.Error(err.Error())
return 1
}
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if plan != nil {
// Disable refreshing no matter what since we only want to show the plan
refresh = false
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// Set the config path to empty for backend loading
configPath = ""
}
var diags tfdiags.Diagnostics
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// Load the module if we don't have one yet (not running from plan)
var mod *module.Tree
if plan == nil {
var modDiags tfdiags.Diagnostics
mod, modDiags = c.Module(configPath)
diags = diags.Append(modDiags)
if modDiags.HasErrors() {
c.showDiagnostics(diags)
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return 1
}
}
var conf *config.Config
if mod != nil {
conf = mod.Config()
}
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// Load the backend
b, err := c.Backend(&BackendOpts{
Config: conf,
Plan: plan,
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})
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to load backend: %s", err))
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return 1
}
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// Build the operation
opReq := c.Operation()
opReq.Destroy = destroy
opReq.Module = mod
opReq.Plan = plan
opReq.PlanRefresh = refresh
opReq.PlanOutPath = outPath
opReq.Type = backend.OperationTypePlan
// Perform the operation
op, err := c.RunOperation(b, opReq)
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if err != nil {
diags = diags.Append(err)
}
c.showDiagnostics(diags)
if diags.HasErrors() {
return 1
}
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if detailed && !op.PlanEmpty {
return 2
}
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return 0
}
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func (c *PlanCommand) Help() string {
helpText := `
Usage: terraform plan [options] [DIR-OR-PLAN]
Generates an execution plan for Terraform.
This execution plan can be reviewed prior to running apply to get a
sense for what Terraform will do. Optionally, the plan can be saved to
a Terraform plan file, and apply can take this plan file to execute
this plan exactly.
If a saved plan is passed as an argument, this command will output
the saved plan contents. It will not modify the given plan.
Options:
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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.
-module-depth=n Specifies the depth of modules to show in the output.
This does not affect the plan itself, only the output
shown. By default, this is -1, which will expand all.
-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 {
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return "Generate and show an execution plan"
}