terraform/backend/local/backend_apply_test.go

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package local
import (
"context"
"errors"
"os"
"path/filepath"
"strings"
"sync"
"testing"
"github.com/mitchellh/cli"
"github.com/zclconf/go-cty/cty"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/internal/initwd"
"github.com/hashicorp/terraform/providers"
"github.com/hashicorp/terraform/states"
"github.com/hashicorp/terraform/states/statemgr"
"github.com/hashicorp/terraform/terraform"
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"github.com/hashicorp/terraform/tfdiags"
)
func TestLocal_applyBasic(t *testing.T) {
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b, cleanup := TestLocal(t)
defer cleanup()
p := TestLocalProvider(t, b, "test", applyFixtureSchema())
p.ApplyResourceChangeResponse = providers.ApplyResourceChangeResponse{NewState: cty.ObjectVal(map[string]cty.Value{
"id": cty.StringVal("yes"),
"ami": cty.StringVal("bar"),
})}
op, configCleanup := testOperationApply(t, "./testdata/apply")
defer configCleanup()
run, err := b.Operation(context.Background(), op)
if err != nil {
t.Fatalf("bad: %s", err)
}
<-run.Done()
if run.Result != backend.OperationSuccess {
t.Fatal("operation failed")
}
if p.ReadResourceCalled {
t.Fatal("ReadResource should not be called")
}
if !p.PlanResourceChangeCalled {
t.Fatal("diff should be called")
}
if !p.ApplyResourceChangeCalled {
t.Fatal("apply should be called")
}
checkState(t, b.StateOutPath, `
test_instance.foo:
ID = yes
provider = provider.test
ami = bar
`)
}
func TestLocal_applyEmptyDir(t *testing.T) {
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b, cleanup := TestLocal(t)
defer cleanup()
p := TestLocalProvider(t, b, "test", &terraform.ProviderSchema{})
p.ApplyResourceChangeResponse = providers.ApplyResourceChangeResponse{NewState: cty.ObjectVal(map[string]cty.Value{"id": cty.StringVal("yes")})}
op, configCleanup := testOperationApply(t, "./testdata/empty")
defer configCleanup()
run, err := b.Operation(context.Background(), op)
if err != nil {
t.Fatalf("bad: %s", err)
}
<-run.Done()
if run.Result == backend.OperationSuccess {
t.Fatal("operation succeeded; want error")
}
if p.ApplyResourceChangeCalled {
t.Fatal("apply should not be called")
}
if _, err := os.Stat(b.StateOutPath); err == nil {
t.Fatal("should not exist")
}
}
func TestLocal_applyEmptyDirDestroy(t *testing.T) {
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b, cleanup := TestLocal(t)
defer cleanup()
p := TestLocalProvider(t, b, "test", &terraform.ProviderSchema{})
p.ApplyResourceChangeResponse = providers.ApplyResourceChangeResponse{}
op, configCleanup := testOperationApply(t, "./testdata/empty")
defer configCleanup()
op.Destroy = true
run, err := b.Operation(context.Background(), op)
if err != nil {
t.Fatalf("bad: %s", err)
}
<-run.Done()
if run.Result != backend.OperationSuccess {
t.Fatalf("apply operation failed")
}
if p.ApplyResourceChangeCalled {
t.Fatal("apply should not be called")
}
checkState(t, b.StateOutPath, `<no state>`)
}
func TestLocal_applyError(t *testing.T) {
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b, cleanup := TestLocal(t)
defer cleanup()
schema := &terraform.ProviderSchema{
ResourceTypes: map[string]*configschema.Block{
"test_instance": {
Attributes: map[string]*configschema.Attribute{
"ami": {Type: cty.String, Optional: true},
"id": {Type: cty.String, Computed: true},
},
},
},
}
p := TestLocalProvider(t, b, "test", schema)
var lock sync.Mutex
errored := false
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p.ApplyResourceChangeFn = func(
r providers.ApplyResourceChangeRequest) providers.ApplyResourceChangeResponse {
lock.Lock()
defer lock.Unlock()
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var diags tfdiags.Diagnostics
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ami := r.Config.GetAttr("ami").AsString()
if !errored && ami == "error" {
errored = true
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diags = diags.Append(errors.New("error"))
return providers.ApplyResourceChangeResponse{
Diagnostics: diags,
}
}
return providers.ApplyResourceChangeResponse{
Diagnostics: diags,
NewState: cty.ObjectVal(map[string]cty.Value{
"id": cty.StringVal("foo"),
"ami": cty.StringVal("bar"),
}),
}
}
op, configCleanup := testOperationApply(t, "./testdata/apply-error")
defer configCleanup()
run, err := b.Operation(context.Background(), op)
if err != nil {
t.Fatalf("bad: %s", err)
}
<-run.Done()
if run.Result == backend.OperationSuccess {
t.Fatal("operation succeeded; want failure")
}
checkState(t, b.StateOutPath, `
test_instance.foo:
ID = foo
provider = provider.test
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ami = bar
`)
}
func TestLocal_applyBackendFail(t *testing.T) {
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b, cleanup := TestLocal(t)
defer cleanup()
p := TestLocalProvider(t, b, "test", applyFixtureSchema())
p.ApplyResourceChangeResponse = providers.ApplyResourceChangeResponse{NewState: cty.ObjectVal(map[string]cty.Value{
"id": cty.StringVal("yes"),
"ami": cty.StringVal("bar"),
})}
wd, err := os.Getwd()
if err != nil {
t.Fatalf("failed to get current working directory")
}
err = os.Chdir(filepath.Dir(b.StatePath))
if err != nil {
t.Fatalf("failed to set temporary working directory")
}
defer os.Chdir(wd)
op, configCleanup := testOperationApply(t, wd+"/testdata/apply")
defer configCleanup()
b.Backend = &backendWithFailingState{}
b.CLI = new(cli.MockUi)
run, err := b.Operation(context.Background(), op)
if err != nil {
t.Fatalf("bad: %s", err)
}
<-run.Done()
if run.Result == backend.OperationSuccess {
t.Fatalf("apply succeeded; want error")
}
msgStr := b.CLI.(*cli.MockUi).ErrorWriter.String()
if !strings.Contains(msgStr, "Failed to save state: fake failure") {
t.Fatalf("missing \"fake failure\" message in output:\n%s", msgStr)
}
// The fallback behavior should've created a file errored.tfstate in the
// current working directory.
checkState(t, "errored.tfstate", `
test_instance.foo:
ID = yes
provider = provider.test
ami = bar
`)
}
type backendWithFailingState struct {
Local
}
func (b *backendWithFailingState) StateMgr(name string) (statemgr.Full, error) {
return &failingState{
statemgr.NewFilesystem("failing-state.tfstate"),
}, nil
}
type failingState struct {
*statemgr.Filesystem
}
func (s failingState) WriteState(state *states.State) error {
return errors.New("fake failure")
}
func testOperationApply(t *testing.T, configDir string) (*backend.Operation, func()) {
t.Helper()
_, configLoader, configCleanup := initwd.MustLoadConfigForTests(t, configDir)
return &backend.Operation{
Type: backend.OperationTypeApply,
ConfigDir: configDir,
ConfigLoader: configLoader,
}, configCleanup
}
// applyFixtureSchema returns a schema suitable for processing the
// configuration in testdata/apply . This schema should be
// assigned to a mock provider named "test".
func applyFixtureSchema() *terraform.ProviderSchema {
return &terraform.ProviderSchema{
ResourceTypes: map[string]*configschema.Block{
"test_instance": {
Attributes: map[string]*configschema.Attribute{
"ami": {Type: cty.String, Optional: true},
"id": {Type: cty.String, Computed: true},
},
},
},
}
}