terraform/backend/local/backend_local.go

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package local
import (
"context"
"errors"
"log"
"github.com/hashicorp/errwrap"
"github.com/hashicorp/terraform/backend"
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"github.com/hashicorp/terraform/command/clistate"
"github.com/hashicorp/terraform/command/format"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/terraform"
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"github.com/hashicorp/terraform/tfdiags"
)
// backend.Local implementation.
func (b *Local) Context(op *backend.Operation) (*terraform.Context, state.State, error) {
// Make sure the type is invalid. We use this as a way to know not
// to ask for input/validate.
op.Type = backend.OperationTypeInvalid
if op.LockState {
op.StateLocker = clistate.NewLocker(context.Background(), op.StateLockTimeout, b.CLI, b.Colorize())
} else {
op.StateLocker = clistate.NewNoopLocker()
}
return b.context(op)
}
func (b *Local) context(op *backend.Operation) (*terraform.Context, state.State, error) {
// Get the state.
s, err := b.State(op.Workspace)
if err != nil {
return nil, nil, errwrap.Wrapf("Error loading state: {{err}}", err)
}
if err := op.StateLocker.Lock(s, op.Type.String()); err != nil {
return nil, nil, errwrap.Wrapf("Error locking state: {{err}}", err)
}
if err := s.RefreshState(); err != nil {
return nil, nil, errwrap.Wrapf("Error loading state: {{err}}", err)
}
// Initialize our context options
var opts terraform.ContextOpts
if v := b.ContextOpts; v != nil {
opts = *v
}
// Copy set options from the operation
opts.Destroy = op.Destroy
opts.Module = op.Module
opts.Targets = op.Targets
opts.UIInput = op.UIIn
if op.Variables != nil {
opts.Variables = op.Variables
}
// Load our state
// By the time we get here, the backend creation code in "command" took
// care of making s.State() return a state compatible with our plan,
// if any, so we can safely pass this value in both the plan context
// and new context cases below.
opts.State = s.State()
// Build the context
var tfCtx *terraform.Context
if op.Plan != nil {
tfCtx, err = op.Plan.Context(&opts)
} else {
tfCtx, err = terraform.NewContext(&opts)
}
// any errors resolving plugins returns this
if rpe, ok := err.(*terraform.ResourceProviderError); ok {
b.pluginInitRequired(rpe)
// we wrote the full UI error here, so return a generic error for flow
// control in the command.
return nil, nil, errors.New("error satisfying plugin requirements")
}
if err != nil {
return nil, nil, err
}
// If we have an operation, then we automatically do the input/validate
// here since every option requires this.
if op.Type != backend.OperationTypeInvalid {
// If input asking is enabled, then do that
if op.Plan == nil && b.OpInput {
mode := terraform.InputModeProvider
mode |= terraform.InputModeVar
mode |= terraform.InputModeVarUnset
if err := tfCtx.Input(mode); err != nil {
return nil, nil, errwrap.Wrapf("Error asking for user input: {{err}}", err)
}
}
// If validation is enabled, validate
if b.OpValidation {
diags := tfCtx.Validate()
if len(diags) > 0 {
if diags.HasErrors() {
// If there are warnings _and_ errors then we'll take this
// path and return them all together in this error.
return nil, nil, diags.Err()
}
// For now we can't propagate warnings any further without
// printing them directly to the UI, so we'll need to
// format them here ourselves.
for _, diag := range diags {
if diag.Severity() != tfdiags.Warning {
continue
}
if b.CLI != nil {
b.CLI.Warn(format.Diagnostic(diag, b.Colorize(), 72))
} else {
desc := diag.Description()
log.Printf("[WARN] backend/local: %s", desc.Summary)
}
}
// Make a newline before continuing
b.CLI.Output("")
}
}
}
return tfCtx, s, nil
}
const validateWarnHeader = `
There are warnings related to your configuration. If no errors occurred,
Terraform will continue despite these warnings. It is a good idea to resolve
these warnings in the near future.
Warnings:
`