mirror of https://github.com/coder/coder.git
549 lines
14 KiB
Go
549 lines
14 KiB
Go
package terraform
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import (
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"bufio"
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strings"
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"sync"
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"github.com/hashicorp/go-version"
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tfjson "github.com/hashicorp/terraform-json"
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"golang.org/x/xerrors"
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"cdr.dev/slog"
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"github.com/coder/coder/provisionersdk/proto"
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)
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type executor struct {
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mut *sync.Mutex
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binaryPath string
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// cachePath and workdir must not be used by multiple processes at once.
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cachePath string
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workdir string
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}
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func (e *executor) basicEnv() []string {
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// Required for "terraform init" to find "git" to
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// clone Terraform modules.
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env := safeEnviron()
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// Only Linux reliably works with the Terraform plugin
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// cache directory. It's unknown why this is.
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if e.cachePath != "" && runtime.GOOS == "linux" {
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env = append(env, "TF_PLUGIN_CACHE_DIR="+e.cachePath)
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}
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return env
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}
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// execWriteOutput must only be called while the lock is held.
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func (e *executor) execWriteOutput(ctx, killCtx context.Context, args, env []string, stdOutWriter, stdErrWriter io.WriteCloser) (err error) {
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defer func() {
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closeErr := stdOutWriter.Close()
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if err == nil && closeErr != nil {
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err = closeErr
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}
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closeErr = stdErrWriter.Close()
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if err == nil && closeErr != nil {
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err = closeErr
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}
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}()
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if ctx.Err() != nil {
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return ctx.Err()
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}
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if isCanarySet(env) {
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return xerrors.New("environment variables not sanitized, this is a bug within Coder")
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}
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// #nosec
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cmd := exec.CommandContext(killCtx, e.binaryPath, args...)
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cmd.Dir = e.workdir
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if env == nil {
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// We don't want to passthrough host env when unset.
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env = []string{}
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}
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cmd.Env = env
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// We want logs to be written in the correct order, so we wrap all logging
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// in a sync.Mutex.
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mut := &sync.Mutex{}
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cmd.Stdout = syncWriter{mut, stdOutWriter}
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cmd.Stderr = syncWriter{mut, stdErrWriter}
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err = cmd.Start()
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if err != nil {
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return err
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}
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interruptCommandOnCancel(ctx, killCtx, cmd)
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return cmd.Wait()
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}
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// execParseJSON must only be called while the lock is held.
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func (e *executor) execParseJSON(ctx, killCtx context.Context, args, env []string, v interface{}) error {
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if ctx.Err() != nil {
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return ctx.Err()
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}
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// #nosec
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cmd := exec.CommandContext(killCtx, e.binaryPath, args...)
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cmd.Dir = e.workdir
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cmd.Env = env
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out := &bytes.Buffer{}
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stdErr := &bytes.Buffer{}
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cmd.Stdout = out
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cmd.Stderr = stdErr
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err := cmd.Start()
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if err != nil {
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return err
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}
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interruptCommandOnCancel(ctx, killCtx, cmd)
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err = cmd.Wait()
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if err != nil {
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errString, _ := io.ReadAll(stdErr)
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return xerrors.Errorf("%s: %w", errString, err)
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}
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dec := json.NewDecoder(out)
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dec.UseNumber()
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err = dec.Decode(v)
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if err != nil {
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return xerrors.Errorf("decode terraform json: %w", err)
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}
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return nil
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}
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func (e *executor) checkMinVersion(ctx context.Context) error {
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v, err := e.version(ctx)
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if err != nil {
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return err
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}
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if !v.GreaterThanOrEqual(minTerraformVersion) {
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return xerrors.Errorf(
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"terraform version %q is too old. required >= %q",
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v.String(),
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minTerraformVersion.String())
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}
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return nil
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}
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// version doesn't need the lock because it doesn't read or write to any state.
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func (e *executor) version(ctx context.Context) (*version.Version, error) {
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return versionFromBinaryPath(ctx, e.binaryPath)
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}
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func versionFromBinaryPath(ctx context.Context, binaryPath string) (*version.Version, error) {
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if ctx.Err() != nil {
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return nil, ctx.Err()
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}
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// #nosec
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cmd := exec.CommandContext(ctx, binaryPath, "version", "-json")
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out, err := cmd.Output()
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if err != nil {
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select {
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// `exec` library throws a `signal: killed`` error instead of the canceled context.
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// Since we know the cause for the killed signal, we are throwing the relevant error here.
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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return nil, err
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}
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}
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vj := tfjson.VersionOutput{}
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err = json.Unmarshal(out, &vj)
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if err != nil {
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return nil, err
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}
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return version.NewVersion(vj.Version)
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}
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func (e *executor) init(ctx, killCtx context.Context, logr logSink) error {
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e.mut.Lock()
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defer e.mut.Unlock()
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outWriter, doneOut := logWriter(logr, proto.LogLevel_DEBUG)
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errWriter, doneErr := logWriter(logr, proto.LogLevel_ERROR)
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defer func() {
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_ = outWriter.Close()
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_ = errWriter.Close()
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<-doneOut
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<-doneErr
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}()
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args := []string{
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"init",
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"-no-color",
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"-input=false",
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}
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return e.execWriteOutput(ctx, killCtx, args, e.basicEnv(), outWriter, errWriter)
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}
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// revive:disable-next-line:flag-parameter
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func (e *executor) plan(ctx, killCtx context.Context, env, vars []string, logr logSink, destroy bool) (*proto.Provision_Response, error) {
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e.mut.Lock()
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defer e.mut.Unlock()
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planfilePath := filepath.Join(e.workdir, "terraform.tfplan")
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args := []string{
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"plan",
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"-no-color",
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"-input=false",
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"-json",
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"-refresh=true",
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"-out=" + planfilePath,
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}
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if destroy {
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args = append(args, "-destroy")
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}
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for _, variable := range vars {
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args = append(args, "-var", variable)
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}
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outWriter, doneOut := provisionLogWriter(logr)
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errWriter, doneErr := logWriter(logr, proto.LogLevel_ERROR)
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defer func() {
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_ = outWriter.Close()
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_ = errWriter.Close()
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<-doneOut
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<-doneErr
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}()
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err := e.execWriteOutput(ctx, killCtx, args, env, outWriter, errWriter)
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if err != nil {
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return nil, xerrors.Errorf("terraform plan: %w", err)
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}
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resources, parameters, err := e.planResources(ctx, killCtx, planfilePath)
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if err != nil {
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return nil, err
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}
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planFileByt, err := os.ReadFile(planfilePath)
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if err != nil {
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return nil, err
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}
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return &proto.Provision_Response{
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Type: &proto.Provision_Response_Complete{
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Complete: &proto.Provision_Complete{
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Parameters: parameters,
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Resources: resources,
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Plan: planFileByt,
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},
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},
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}, nil
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}
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// planResources must only be called while the lock is held.
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func (e *executor) planResources(ctx, killCtx context.Context, planfilePath string) ([]*proto.Resource, []*proto.RichParameter, error) {
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plan, err := e.showPlan(ctx, killCtx, planfilePath)
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if err != nil {
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return nil, nil, xerrors.Errorf("show terraform plan file: %w", err)
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}
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rawGraph, err := e.graph(ctx, killCtx)
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if err != nil {
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return nil, nil, xerrors.Errorf("graph: %w", err)
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}
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modules := []*tfjson.StateModule{}
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if plan.PriorState != nil {
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modules = append(modules, plan.PriorState.Values.RootModule)
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}
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modules = append(modules, plan.PlannedValues.RootModule)
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return ConvertResourcesAndParameters(modules, rawGraph)
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}
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// showPlan must only be called while the lock is held.
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func (e *executor) showPlan(ctx, killCtx context.Context, planfilePath string) (*tfjson.Plan, error) {
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args := []string{"show", "-json", "-no-color", planfilePath}
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p := new(tfjson.Plan)
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err := e.execParseJSON(ctx, killCtx, args, e.basicEnv(), p)
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return p, err
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}
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// graph must only be called while the lock is held.
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func (e *executor) graph(ctx, killCtx context.Context) (string, error) {
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if ctx.Err() != nil {
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return "", ctx.Err()
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}
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var out strings.Builder
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cmd := exec.CommandContext(killCtx, e.binaryPath, "graph") // #nosec
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cmd.Stdout = &out
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cmd.Dir = e.workdir
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cmd.Env = e.basicEnv()
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err := cmd.Start()
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if err != nil {
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return "", err
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}
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interruptCommandOnCancel(ctx, killCtx, cmd)
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err = cmd.Wait()
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if err != nil {
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return "", xerrors.Errorf("graph: %w", err)
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}
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return out.String(), nil
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}
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func (e *executor) apply(
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ctx, killCtx context.Context, plan []byte, env []string, logr logSink,
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) (*proto.Provision_Response, error) {
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e.mut.Lock()
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defer e.mut.Unlock()
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planFile, err := os.CreateTemp("", "coder-terrafrom-plan")
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if err != nil {
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return nil, xerrors.Errorf("create plan file: %w", err)
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}
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_, err = planFile.Write(plan)
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if err != nil {
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return nil, xerrors.Errorf("write plan file: %w", err)
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}
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defer os.Remove(planFile.Name())
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args := []string{
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"apply",
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"-no-color",
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"-auto-approve",
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"-input=false",
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"-json",
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planFile.Name(),
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}
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outWriter, doneOut := provisionLogWriter(logr)
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errWriter, doneErr := logWriter(logr, proto.LogLevel_ERROR)
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defer func() {
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_ = outWriter.Close()
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_ = errWriter.Close()
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<-doneOut
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<-doneErr
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}()
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err = e.execWriteOutput(ctx, killCtx, args, env, outWriter, errWriter)
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if err != nil {
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return nil, xerrors.Errorf("terraform apply: %w", err)
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}
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resources, parameters, err := e.stateResources(ctx, killCtx)
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if err != nil {
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return nil, err
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}
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statefilePath := filepath.Join(e.workdir, "terraform.tfstate")
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stateContent, err := os.ReadFile(statefilePath)
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if err != nil {
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return nil, xerrors.Errorf("read statefile %q: %w", statefilePath, err)
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}
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return &proto.Provision_Response{
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Type: &proto.Provision_Response_Complete{
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Complete: &proto.Provision_Complete{
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Parameters: parameters,
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Resources: resources,
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State: stateContent,
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},
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},
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}, nil
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}
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// stateResources must only be called while the lock is held.
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func (e *executor) stateResources(ctx, killCtx context.Context) ([]*proto.Resource, []*proto.RichParameter, error) {
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state, err := e.state(ctx, killCtx)
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if err != nil {
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return nil, nil, err
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}
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rawGraph, err := e.graph(ctx, killCtx)
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if err != nil {
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return nil, nil, xerrors.Errorf("get terraform graph: %w", err)
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}
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var resources []*proto.Resource
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var parameters []*proto.RichParameter
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if state.Values != nil {
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resources, parameters, err = ConvertResourcesAndParameters([]*tfjson.StateModule{
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state.Values.RootModule,
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}, rawGraph)
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if err != nil {
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return nil, nil, err
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}
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}
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return resources, parameters, nil
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}
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// state must only be called while the lock is held.
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func (e *executor) state(ctx, killCtx context.Context) (*tfjson.State, error) {
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args := []string{"show", "-json", "-no-color"}
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state := &tfjson.State{}
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err := e.execParseJSON(ctx, killCtx, args, e.basicEnv(), state)
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if err != nil {
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return nil, xerrors.Errorf("terraform show state: %w", err)
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}
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return state, nil
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}
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func interruptCommandOnCancel(ctx, killCtx context.Context, cmd *exec.Cmd) {
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go func() {
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select {
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case <-ctx.Done():
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switch runtime.GOOS {
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case "windows":
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// Interrupts aren't supported by Windows.
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_ = cmd.Process.Kill()
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default:
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_ = cmd.Process.Signal(os.Interrupt)
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}
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case <-killCtx.Done():
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}
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}()
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}
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type logSink interface {
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Log(*proto.Log)
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}
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type streamLogSink struct {
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// Any errors writing to the stream will be logged to logger.
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logger slog.Logger
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stream proto.DRPCProvisioner_ProvisionStream
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}
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var _ logSink = streamLogSink{}
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func (s streamLogSink) Log(l *proto.Log) {
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err := s.stream.Send(&proto.Provision_Response{
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Type: &proto.Provision_Response_Log{
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Log: l,
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},
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})
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if err != nil {
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s.logger.Warn(context.Background(), "write log to stream",
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slog.F("level", l.Level.String()),
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slog.F("message", l.Output),
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slog.Error(err),
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)
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}
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}
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// logWriter creates a WriteCloser that will log each line of text at the given level. The WriteCloser must be closed
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// by the caller to end logging, after which the returned channel will be closed to indicate that logging of the written
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// data has finished. Failure to close the WriteCloser will leak a goroutine.
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func logWriter(sink logSink, level proto.LogLevel) (io.WriteCloser, <-chan any) {
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r, w := io.Pipe()
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done := make(chan any)
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go readAndLog(sink, r, done, level)
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return w, done
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}
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func readAndLog(sink logSink, r io.Reader, done chan<- any, level proto.LogLevel) {
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defer close(done)
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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sink.Log(&proto.Log{Level: level, Output: scanner.Text()})
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}
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}
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// provisionLogWriter creates a WriteCloser that will log each JSON formatted terraform log. The WriteCloser must be
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// closed by the caller to end logging, after which the returned channel will be closed to indicate that logging of the
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// written data has finished. Failure to close the WriteCloser will leak a goroutine.
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func provisionLogWriter(sink logSink) (io.WriteCloser, <-chan any) {
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r, w := io.Pipe()
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done := make(chan any)
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go provisionReadAndLog(sink, r, done)
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return w, done
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}
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func provisionReadAndLog(sink logSink, r io.Reader, done chan<- any) {
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defer close(done)
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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var log terraformProvisionLog
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err := json.Unmarshal(scanner.Bytes(), &log)
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if err != nil {
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// Sometimes terraform doesn't log JSON, even though we asked it to.
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// The terraform maintainers have said on the issue tracker that
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// they don't guarantee that non-JSON lines won't get printed.
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// https://github.com/hashicorp/terraform/issues/29252#issuecomment-887710001
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//
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// > I think as a practical matter it isn't possible for us to
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// > promise that the output will always be entirely JSON, because
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// > there's plenty of code that runs before command line arguments
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// > are parsed and thus before we even know we're in JSON mode.
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// > Given that, I'd suggest writing code that consumes streaming
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// > JSON output from Terraform in such a way that it can tolerate
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// > the output not having JSON in it at all.
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//
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// Log lines such as:
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// - Acquiring state lock. This may take a few moments...
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// - Releasing state lock. This may take a few moments...
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if strings.TrimSpace(scanner.Text()) == "" {
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continue
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}
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log.Level = "info"
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log.Message = scanner.Text()
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}
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logLevel := convertTerraformLogLevel(log.Level, sink)
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sink.Log(&proto.Log{Level: logLevel, Output: log.Message})
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// If the diagnostic is provided, let's provide a bit more info!
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if log.Diagnostic == nil {
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continue
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}
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logLevel = convertTerraformLogLevel(log.Diagnostic.Severity, sink)
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sink.Log(&proto.Log{Level: logLevel, Output: log.Diagnostic.Detail})
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}
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}
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func convertTerraformLogLevel(logLevel string, sink logSink) proto.LogLevel {
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switch strings.ToLower(logLevel) {
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case "trace":
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return proto.LogLevel_TRACE
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case "debug":
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return proto.LogLevel_DEBUG
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case "info":
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return proto.LogLevel_INFO
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case "warn":
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return proto.LogLevel_WARN
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case "error":
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return proto.LogLevel_ERROR
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default:
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sink.Log(&proto.Log{
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Level: proto.LogLevel_WARN,
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Output: fmt.Sprintf("unable to convert log level %s", logLevel),
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})
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return proto.LogLevel_INFO
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}
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}
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type terraformProvisionLog struct {
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Level string `json:"@level"`
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Message string `json:"@message"`
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Diagnostic *terraformProvisionLogDiagnostic `json:"diagnostic"`
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}
|
|
|
|
type terraformProvisionLogDiagnostic struct {
|
|
Severity string `json:"severity"`
|
|
Summary string `json:"summary"`
|
|
Detail string `json:"detail"`
|
|
}
|
|
|
|
// syncWriter wraps an io.Writer in a sync.Mutex.
|
|
type syncWriter struct {
|
|
mut *sync.Mutex
|
|
w io.Writer
|
|
}
|
|
|
|
// Write implements io.Writer.
|
|
func (sw syncWriter) Write(p []byte) (n int, err error) {
|
|
sw.mut.Lock()
|
|
defer sw.mut.Unlock()
|
|
return sw.w.Write(p)
|
|
}
|