terraform/command/arguments/extended.go

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2021-02-18 23:23:34 +01:00
package arguments
import (
"flag"
"fmt"
"time"
"github.com/hashicorp/hcl/v2"
"github.com/hashicorp/hcl/v2/hclsyntax"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/plans"
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"github.com/hashicorp/terraform/tfdiags"
)
// DefaultParallelism is the limit Terraform places on total parallel
// operations as it walks the dependency graph.
const DefaultParallelism = 10
// State describes arguments which are used to define how Terraform interacts
// with state.
type State struct {
// Lock controls whether or not the state manager is used to lock state
// during operations.
Lock bool
// LockTimeout allows setting a time limit on acquiring the state lock.
// The default is 0, meaning no limit.
LockTimeout time.Duration
// StatePath specifies a non-default location for the state file. The
// default value is blank, which is interpeted as "terraform.tfstate".
StatePath string
// StateOutPath specifies a different path to write the final state file.
// The default value is blank, which results in state being written back to
// StatePath.
StateOutPath string
// BackupPath specifies the path where a backup copy of the state file will
// be stored before the new state is written. The default value is blank,
// which is interpreted as StateOutPath +
// ".backup".
BackupPath string
}
// Operation describes arguments which are used to configure how a Terraform
// operation such as a plan or apply executes.
type Operation struct {
// PlanMode selects one of the mutually-exclusive planning modes that
// decides the overall goal of a plan operation. This field is relevant
// only for an operation that produces a plan.
PlanMode plans.Mode
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// Parallelism is the limit Terraform places on total parallel operations
// as it walks the dependency graph.
Parallelism int
// Refresh controls whether or not the operation should refresh existing
// state before proceeding. Default is true.
Refresh bool
// Targets allow limiting an operation to a set of resource addresses and
// their dependencies.
Targets []addrs.Targetable
// These private fields are used only temporarily during decoding. Use
// method Parse to populate the exported fields from these, validating
// the raw values in the process.
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targetsRaw []string
destroyRaw bool
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}
// Parse must be called on Operation after initial flag parse. This processes
// the raw target flags into addrs.Targetable values, returning diagnostics if
// invalid.
func (o *Operation) Parse() tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
o.Targets = nil
for _, tr := range o.targetsRaw {
traversal, syntaxDiags := hclsyntax.ParseTraversalAbs([]byte(tr), "", hcl.Pos{Line: 1, Column: 1})
if syntaxDiags.HasErrors() {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
fmt.Sprintf("Invalid target %q", tr),
syntaxDiags[0].Detail,
))
continue
}
target, targetDiags := addrs.ParseTarget(traversal)
if targetDiags.HasErrors() {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
fmt.Sprintf("Invalid target %q", tr),
targetDiags[0].Description().Detail,
))
continue
}
o.Targets = append(o.Targets, target.Subject)
}
// If you add a new possible value for o.PlanMode here, consider also
// adding a specialized error message for it in ParseApplyDestroy.
switch {
case o.destroyRaw:
o.PlanMode = plans.DestroyMode
default:
o.PlanMode = plans.NormalMode
}
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return diags
}
// Vars describes arguments which specify non-default variable values. This
// interfce is unfortunately obscure, because the order of the CLI arguments
// determines the final value of the gathered variables. In future it might be
// desirable for the arguments package to handle the gathering of variables
// directly, returning a map of variable values.
type Vars struct {
vars *flagNameValueSlice
varFiles *flagNameValueSlice
}
func (v *Vars) All() []FlagNameValue {
if v.vars == nil {
return nil
}
return v.vars.AllItems()
}
func (v *Vars) Empty() bool {
if v.vars == nil {
return true
}
return v.vars.Empty()
}
// extendedFlagSet creates a FlagSet with common backend, operation, and vars
// flags used in many commands. Target structs for each subset of flags must be
// provided in order to support those flags.
func extendedFlagSet(name string, state *State, operation *Operation, vars *Vars) *flag.FlagSet {
f := defaultFlagSet(name)
if state == nil && operation == nil && vars == nil {
panic("use defaultFlagSet")
}
if state != nil {
f.BoolVar(&state.Lock, "lock", true, "lock")
f.DurationVar(&state.LockTimeout, "lock-timeout", 0, "lock-timeout")
f.StringVar(&state.StatePath, "state", "", "state-path")
f.StringVar(&state.StateOutPath, "state-out", "", "state-path")
f.StringVar(&state.BackupPath, "backup", "", "backup-path")
}
if operation != nil {
f.IntVar(&operation.Parallelism, "parallelism", DefaultParallelism, "parallelism")
f.BoolVar(&operation.Refresh, "refresh", true, "refresh")
f.BoolVar(&operation.destroyRaw, "destroy", false, "destroy")
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f.Var((*flagStringSlice)(&operation.targetsRaw), "target", "target")
}
// Gather all -var and -var-file arguments into one heterogenous structure
// to preserve the overall order.
if vars != nil {
varsFlags := newFlagNameValueSlice("-var")
varFilesFlags := varsFlags.Alias("-var-file")
vars.vars = &varsFlags
vars.varFiles = &varFilesFlags
f.Var(vars.vars, "var", "var")
f.Var(vars.varFiles, "var-file", "var-file")
}
return f
}