package planfile import ( "fmt" "io" "io/ioutil" "google.golang.org/protobuf/proto" "github.com/hashicorp/terraform/addrs" "github.com/hashicorp/terraform/plans" "github.com/hashicorp/terraform/plans/internal/planproto" "github.com/hashicorp/terraform/states" "github.com/hashicorp/terraform/tfdiags" "github.com/hashicorp/terraform/version" ) const tfplanFormatVersion = 3 const tfplanFilename = "tfplan" // --------------------------------------------------------------------------- // This file deals with the internal structure of the "tfplan" sub-file within // the plan file format. It's all private API, wrapped by methods defined // elsewhere. This is the only file that should import the // ../internal/planproto package, which contains the ugly stubs generated // by the protobuf compiler. // --------------------------------------------------------------------------- // readTfplan reads a protobuf-encoded description from the plan portion of // a plan file, which is stored in a special file in the archive called // "tfplan". func readTfplan(r io.Reader) (*plans.Plan, error) { src, err := ioutil.ReadAll(r) if err != nil { return nil, err } var rawPlan planproto.Plan err = proto.Unmarshal(src, &rawPlan) if err != nil { return nil, fmt.Errorf("parse error: %s", err) } if rawPlan.Version != tfplanFormatVersion { return nil, fmt.Errorf("unsupported plan file format version %d; only version %d is supported", rawPlan.Version, tfplanFormatVersion) } if rawPlan.TerraformVersion != version.String() { return nil, fmt.Errorf("plan file was created by Terraform %s, but this is %s; plan files cannot be transferred between different Terraform versions", rawPlan.TerraformVersion, version.String()) } plan := &plans.Plan{ VariableValues: map[string]plans.DynamicValue{}, Changes: &plans.Changes{ Outputs: []*plans.OutputChangeSrc{}, Resources: []*plans.ResourceInstanceChangeSrc{}, }, ProviderSHA256s: map[string][]byte{}, } for _, rawOC := range rawPlan.OutputChanges { name := rawOC.Name change, err := changeFromTfplan(rawOC.Change) if err != nil { return nil, fmt.Errorf("invalid plan for output %q: %s", name, err) } plan.Changes.Outputs = append(plan.Changes.Outputs, &plans.OutputChangeSrc{ // All output values saved in the plan file are root module outputs, // since we don't retain others. (They can be easily recomputed // during apply). Addr: addrs.OutputValue{Name: name}.Absolute(addrs.RootModuleInstance), ChangeSrc: *change, Sensitive: rawOC.Sensitive, }) } for _, rawRC := range rawPlan.ResourceChanges { change, err := resourceChangeFromTfplan(rawRC) if err != nil { // errors from resourceChangeFromTfplan already include context return nil, err } plan.Changes.Resources = append(plan.Changes.Resources, change) } for _, rawTargetAddr := range rawPlan.TargetAddrs { target, diags := addrs.ParseTargetStr(rawTargetAddr) if diags.HasErrors() { return nil, fmt.Errorf("plan contains invalid target address %q: %s", target, diags.Err()) } plan.TargetAddrs = append(plan.TargetAddrs, target.Subject) } for name, rawHashObj := range rawPlan.ProviderHashes { if len(rawHashObj.Sha256) == 0 { return nil, fmt.Errorf("no SHA256 hash for provider %q plugin", name) } plan.ProviderSHA256s[name] = rawHashObj.Sha256 } for name, rawVal := range rawPlan.Variables { val, err := valueFromTfplan(rawVal) if err != nil { return nil, fmt.Errorf("invalid value for input variable %q: %s", name, err) } plan.VariableValues[name] = val } if rawBackend := rawPlan.Backend; rawBackend == nil { return nil, fmt.Errorf("plan file has no backend settings; backend settings are required") } else { config, err := valueFromTfplan(rawBackend.Config) if err != nil { return nil, fmt.Errorf("plan file has invalid backend configuration: %s", err) } plan.Backend = plans.Backend{ Type: rawBackend.Type, Config: config, Workspace: rawBackend.Workspace, } } return plan, nil } func resourceChangeFromTfplan(rawChange *planproto.ResourceInstanceChange) (*plans.ResourceInstanceChangeSrc, error) { if rawChange == nil { // Should never happen in practice, since protobuf can't represent // a nil value in a list. return nil, fmt.Errorf("resource change object is absent") } ret := &plans.ResourceInstanceChangeSrc{} moduleAddr := addrs.RootModuleInstance if rawChange.ModulePath != "" { var diags tfdiags.Diagnostics moduleAddr, diags = addrs.ParseModuleInstanceStr(rawChange.ModulePath) if diags.HasErrors() { return nil, diags.Err() } } providerAddr, diags := addrs.ParseAbsProviderConfigStr(rawChange.Provider) if diags.HasErrors() { return nil, diags.Err() } ret.ProviderAddr = providerAddr var mode addrs.ResourceMode switch rawChange.Mode { case planproto.ResourceInstanceChange_managed: mode = addrs.ManagedResourceMode case planproto.ResourceInstanceChange_data: mode = addrs.DataResourceMode default: return nil, fmt.Errorf("resource has invalid mode %s", rawChange.Mode) } typeName := rawChange.Type name := rawChange.Name resAddr := addrs.Resource{ Mode: mode, Type: typeName, Name: name, } var instKey addrs.InstanceKey switch rawTk := rawChange.InstanceKey.(type) { case nil: case *planproto.ResourceInstanceChange_Int: instKey = addrs.IntKey(rawTk.Int) case *planproto.ResourceInstanceChange_Str: instKey = addrs.StringKey(rawTk.Str) default: return nil, fmt.Errorf("instance of %s has invalid key type %T", resAddr.Absolute(moduleAddr), rawChange.InstanceKey) } ret.Addr = resAddr.Instance(instKey).Absolute(moduleAddr) if rawChange.DeposedKey != "" { if len(rawChange.DeposedKey) != 8 { return nil, fmt.Errorf("deposed object for %s has invalid deposed key %q", ret.Addr, rawChange.DeposedKey) } ret.DeposedKey = states.DeposedKey(rawChange.DeposedKey) } change, err := changeFromTfplan(rawChange.Change) if err != nil { return nil, fmt.Errorf("invalid plan for resource %s: %s", ret.Addr, err) } ret.ChangeSrc = *change if len(rawChange.Private) != 0 { ret.Private = rawChange.Private } return ret, nil } func changeFromTfplan(rawChange *planproto.Change) (*plans.ChangeSrc, error) { if rawChange == nil { return nil, fmt.Errorf("change object is absent") } ret := &plans.ChangeSrc{} // -1 indicates that there is no index. We'll customize these below // depending on the change action, and then decode. beforeIdx, afterIdx := -1, -1 switch rawChange.Action { case planproto.Action_NOOP: ret.Action = plans.NoOp beforeIdx = 0 afterIdx = 0 case planproto.Action_CREATE: ret.Action = plans.Create afterIdx = 0 case planproto.Action_READ: ret.Action = plans.Read beforeIdx = 0 afterIdx = 1 case planproto.Action_UPDATE: ret.Action = plans.Update beforeIdx = 0 afterIdx = 1 case planproto.Action_DELETE: ret.Action = plans.Delete beforeIdx = 0 case planproto.Action_CREATE_THEN_DELETE: ret.Action = plans.CreateThenDelete beforeIdx = 0 afterIdx = 1 case planproto.Action_DELETE_THEN_CREATE: ret.Action = plans.DeleteThenCreate beforeIdx = 0 afterIdx = 1 default: return nil, fmt.Errorf("invalid change action %s", rawChange.Action) } if beforeIdx != -1 { if l := len(rawChange.Values); l <= beforeIdx { return nil, fmt.Errorf("incorrect number of values (%d) for %s change", l, rawChange.Action) } var err error ret.Before, err = valueFromTfplan(rawChange.Values[beforeIdx]) if err != nil { return nil, fmt.Errorf("invalid \"before\" value: %s", err) } if ret.Before == nil { return nil, fmt.Errorf("missing \"before\" value: %s", err) } } if afterIdx != -1 { if l := len(rawChange.Values); l <= afterIdx { return nil, fmt.Errorf("incorrect number of values (%d) for %s change", l, rawChange.Action) } var err error ret.After, err = valueFromTfplan(rawChange.Values[afterIdx]) if err != nil { return nil, fmt.Errorf("invalid \"after\" value: %s", err) } if ret.After == nil { return nil, fmt.Errorf("missing \"after\" value: %s", err) } } return ret, nil } func valueFromTfplan(rawV *planproto.DynamicValue) (plans.DynamicValue, error) { if len(rawV.Msgpack) == 0 { // len(0) because that's the default value for a "bytes" in protobuf return nil, fmt.Errorf("dynamic value does not have msgpack serialization") } return plans.DynamicValue(rawV.Msgpack), nil } // writeTfplan serializes the given plan into the protobuf-based format used // for the "tfplan" portion of a plan file. func writeTfplan(plan *plans.Plan, w io.Writer) error { if plan == nil { return fmt.Errorf("cannot write plan file for nil plan") } if plan.Changes == nil { return fmt.Errorf("cannot write plan file with nil changeset") } rawPlan := &planproto.Plan{ Version: tfplanFormatVersion, TerraformVersion: version.String(), ProviderHashes: map[string]*planproto.Hash{}, Variables: map[string]*planproto.DynamicValue{}, OutputChanges: []*planproto.OutputChange{}, ResourceChanges: []*planproto.ResourceInstanceChange{}, } for _, oc := range plan.Changes.Outputs { // When serializing a plan we only retain the root outputs, since // changes to these are externally-visible side effects (e.g. via // terraform_remote_state). if !oc.Addr.Module.IsRoot() { continue } name := oc.Addr.OutputValue.Name // Writing outputs as cty.DynamicPseudoType forces the stored values // to also contain dynamic type information, so we can recover the // original type when we read the values back in readTFPlan. protoChange, err := changeToTfplan(&oc.ChangeSrc) if err != nil { return fmt.Errorf("cannot write output value %q: %s", name, err) } rawPlan.OutputChanges = append(rawPlan.OutputChanges, &planproto.OutputChange{ Name: name, Change: protoChange, Sensitive: oc.Sensitive, }) } for _, rc := range plan.Changes.Resources { rawRC, err := resourceChangeToTfplan(rc) if err != nil { return err } rawPlan.ResourceChanges = append(rawPlan.ResourceChanges, rawRC) } for _, targetAddr := range plan.TargetAddrs { rawPlan.TargetAddrs = append(rawPlan.TargetAddrs, targetAddr.String()) } for name, hash := range plan.ProviderSHA256s { rawPlan.ProviderHashes[name] = &planproto.Hash{ Sha256: hash, } } for name, val := range plan.VariableValues { rawPlan.Variables[name] = valueToTfplan(val) } if plan.Backend.Type == "" || plan.Backend.Config == nil { // This suggests a bug in the code that created the plan, since it // ought to always have a backend populated, even if it's the default // "local" backend with a local state file. return fmt.Errorf("plan does not have a backend configuration") } rawPlan.Backend = &planproto.Backend{ Type: plan.Backend.Type, Config: valueToTfplan(plan.Backend.Config), Workspace: plan.Backend.Workspace, } src, err := proto.Marshal(rawPlan) if err != nil { return fmt.Errorf("serialization error: %s", err) } _, err = w.Write(src) if err != nil { return fmt.Errorf("failed to write plan to plan file: %s", err) } return nil } func resourceChangeToTfplan(change *plans.ResourceInstanceChangeSrc) (*planproto.ResourceInstanceChange, error) { ret := &planproto.ResourceInstanceChange{} ret.ModulePath = change.Addr.Module.String() relAddr := change.Addr.Resource switch relAddr.Resource.Mode { case addrs.ManagedResourceMode: ret.Mode = planproto.ResourceInstanceChange_managed case addrs.DataResourceMode: ret.Mode = planproto.ResourceInstanceChange_data default: return nil, fmt.Errorf("resource %s has unsupported mode %s", relAddr, relAddr.Resource.Mode) } ret.Type = relAddr.Resource.Type ret.Name = relAddr.Resource.Name switch tk := relAddr.Key.(type) { case nil: // Nothing to do, then. case addrs.IntKey: ret.InstanceKey = &planproto.ResourceInstanceChange_Int{ Int: int64(tk), } case addrs.StringKey: ret.InstanceKey = &planproto.ResourceInstanceChange_Str{ Str: string(tk), } default: return nil, fmt.Errorf("resource %s has unsupported instance key type %T", relAddr, relAddr.Key) } ret.DeposedKey = string(change.DeposedKey) ret.Provider = change.ProviderAddr.String() valChange, err := changeToTfplan(&change.ChangeSrc) if err != nil { return nil, fmt.Errorf("failed to serialize resource %s change: %s", relAddr, err) } ret.Change = valChange if len(change.Private) > 0 { ret.Private = change.Private } return ret, nil } func changeToTfplan(change *plans.ChangeSrc) (*planproto.Change, error) { ret := &planproto.Change{} before := valueToTfplan(change.Before) after := valueToTfplan(change.After) switch change.Action { case plans.NoOp: ret.Action = planproto.Action_NOOP ret.Values = []*planproto.DynamicValue{before} // before and after should be identical case plans.Create: ret.Action = planproto.Action_CREATE ret.Values = []*planproto.DynamicValue{after} case plans.Read: ret.Action = planproto.Action_READ ret.Values = []*planproto.DynamicValue{before, after} case plans.Update: ret.Action = planproto.Action_UPDATE ret.Values = []*planproto.DynamicValue{before, after} case plans.Delete: ret.Action = planproto.Action_DELETE ret.Values = []*planproto.DynamicValue{before} case plans.DeleteThenCreate: ret.Action = planproto.Action_DELETE_THEN_CREATE ret.Values = []*planproto.DynamicValue{before, after} case plans.CreateThenDelete: ret.Action = planproto.Action_CREATE_THEN_DELETE ret.Values = []*planproto.DynamicValue{before, after} default: return nil, fmt.Errorf("invalid change action %s", change.Action) } return ret, nil } func valueToTfplan(val plans.DynamicValue) *planproto.DynamicValue { if val == nil { // protobuf can't represent nil, so we'll represent it as a // DynamicValue that has no serializations at all. return &planproto.DynamicValue{} } return &planproto.DynamicValue{ Msgpack: []byte(val), } }