databricks-cli/bundle/deploy/terraform/init.go

279 lines
8.5 KiB
Go

package terraform
import (
"context"
"errors"
"fmt"
"io/fs"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"time"
"github.com/databricks/cli/bundle"
"github.com/databricks/cli/bundle/config"
"github.com/databricks/cli/bundle/internal/tf/schema"
"github.com/databricks/cli/libs/diag"
"github.com/databricks/cli/libs/env"
"github.com/databricks/cli/libs/log"
"github.com/hashicorp/hc-install/product"
"github.com/hashicorp/hc-install/releases"
"github.com/hashicorp/terraform-exec/tfexec"
"golang.org/x/exp/maps"
)
type initialize struct{}
func (m *initialize) Name() string {
return "terraform.Initialize"
}
func (m *initialize) findExecPath(ctx context.Context, b *bundle.Bundle, tf *config.Terraform) (string, error) {
// If set, pass it through [exec.LookPath] to resolve its absolute path.
if tf.ExecPath != "" {
execPath, err := exec.LookPath(tf.ExecPath)
if err != nil {
return "", err
}
tf.ExecPath = execPath
log.Debugf(ctx, "Using Terraform at %s", tf.ExecPath)
return tf.ExecPath, nil
}
// Load exec path from the environment if it matches the currently used version.
envExecPath, err := getEnvVarWithMatchingVersion(ctx, TerraformExecPathEnv, TerraformVersionEnv, TerraformVersion.String())
if err != nil {
return "", err
}
if envExecPath != "" {
tf.ExecPath = envExecPath
log.Debugf(ctx, "Using Terraform from %s at %s", TerraformExecPathEnv, tf.ExecPath)
return tf.ExecPath, nil
}
binDir, err := b.CacheDir(context.Background(), "bin")
if err != nil {
return "", err
}
// If the execPath already exists, return it.
execPath := filepath.Join(binDir, product.Terraform.BinaryName())
_, err = os.Stat(execPath)
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return "", err
}
if err == nil {
tf.ExecPath = execPath
log.Debugf(ctx, "Using Terraform at %s", tf.ExecPath)
return tf.ExecPath, nil
}
// Download Terraform to private bin directory.
installer := &releases.ExactVersion{
Product: product.Terraform,
Version: TerraformVersion,
InstallDir: binDir,
Timeout: 1 * time.Minute,
}
execPath, err = installer.Install(ctx)
if err != nil {
return "", fmt.Errorf("error downloading Terraform: %w", err)
}
tf.ExecPath = execPath
log.Debugf(ctx, "Using Terraform at %s", tf.ExecPath)
return tf.ExecPath, nil
}
// This function inherits some environment variables for Terraform CLI.
func inheritEnvVars(ctx context.Context, environ map[string]string) error {
// Include $HOME in set of environment variables to pass along.
home, ok := env.Lookup(ctx, "HOME")
if ok {
environ["HOME"] = home
}
// Include $USERPROFILE in set of environment variables to pass along.
// This variable is used by Azure CLI on Windows to find stored credentials and metadata
userProfile, ok := env.Lookup(ctx, "USERPROFILE")
if ok {
environ["USERPROFILE"] = userProfile
}
// Include $PATH in set of environment variables to pass along.
// This is necessary to ensure that our Terraform provider can use the
// same auxiliary programs (e.g. `az`, or `gcloud`) as the CLI.
path, ok := env.Lookup(ctx, "PATH")
if ok {
environ["PATH"] = path
}
// Include $TF_CLI_CONFIG_FILE to override terraform provider in development.
// See: https://developer.hashicorp.com/terraform/cli/config/config-file#explicit-installation-method-configuration
devConfigFile, ok := env.Lookup(ctx, "TF_CLI_CONFIG_FILE")
if ok {
environ["TF_CLI_CONFIG_FILE"] = devConfigFile
}
// Map $DATABRICKS_TF_CLI_CONFIG_FILE to $TF_CLI_CONFIG_FILE
// VSCode extension provides a file with the "provider_installation.filesystem_mirror" configuration.
// We only use it if the provider version matches the currently used version,
// otherwise terraform will fail to download the right version (even with unrestricted internet access).
configFile, err := getEnvVarWithMatchingVersion(ctx, TerraformCliConfigPathEnv, TerraformProviderVersionEnv, schema.ProviderVersion)
if err != nil {
return err
}
if configFile != "" {
log.Debugf(ctx, "Using Terraform CLI config from %s at %s", TerraformCliConfigPathEnv, configFile)
environ["TF_CLI_CONFIG_FILE"] = configFile
}
return nil
}
// Example: this function will return a value of TF_EXEC_PATH only if the path exists and if TF_VERSION matches the TerraformVersion.
// This function is used for env vars set by the Databricks VSCode extension. The variables are intended to be used by the CLI
// bundled with the Databricks VSCode extension, but users can use different CLI versions in the VSCode terminals, in which case we want to ignore
// the variables if that CLI uses different versions of the dependencies.
func getEnvVarWithMatchingVersion(ctx context.Context, envVarName string, versionVarName string, currentVersion string) (string, error) {
envValue := env.Get(ctx, envVarName)
versionValue := env.Get(ctx, versionVarName)
// return early if the environment variable is not set
if envValue == "" {
log.Debugf(ctx, "%s is not defined", envVarName)
return "", nil
}
// If the path does not exist, we return early.
_, err := os.Stat(envValue)
if err != nil {
if errors.Is(err, fs.ErrNotExist) {
log.Debugf(ctx, "%s at %s does not exist", envVarName, envValue)
return "", nil
} else {
return "", err
}
}
// If the version environment variable is not set, we directly return the value of the environment variable.
if versionValue == "" {
return envValue, nil
}
// When the version environment variable is set, we check if it matches the current version.
// If it does not match, we return an empty string.
if versionValue != currentVersion {
log.Debugf(ctx, "%s as %s does not match the current version %s, ignoring %s", versionVarName, versionValue, currentVersion, envVarName)
return "", nil
}
return envValue, nil
}
// This function sets temp dir location for terraform to use. If user does not
// specify anything here, we fall back to a `tmp` directory in the bundle's cache
// directory
//
// This is necessary to avoid trying to create temporary files in directories
// the CLI and its dependencies do not have access to.
//
// see: os.TempDir for more context
func setTempDirEnvVars(ctx context.Context, environ map[string]string, b *bundle.Bundle) error {
switch runtime.GOOS {
case "windows":
if v, ok := env.Lookup(ctx, "TMP"); ok {
environ["TMP"] = v
} else if v, ok := env.Lookup(ctx, "TEMP"); ok {
environ["TEMP"] = v
} else {
tmpDir, err := b.CacheDir(ctx, "tmp")
if err != nil {
return err
}
environ["TMP"] = tmpDir
}
default:
// If TMPDIR is not set, we let the process fall back to its default value.
if v, ok := env.Lookup(ctx, "TMPDIR"); ok {
environ["TMPDIR"] = v
}
}
return nil
}
// This function passes through all proxy related environment variables.
func setProxyEnvVars(ctx context.Context, environ map[string]string, b *bundle.Bundle) error {
for _, v := range []string{"http_proxy", "https_proxy", "no_proxy"} {
// The case (upper or lower) is notoriously inconsistent for tools on Unix systems.
// We therefore try to read both the upper and lower case versions of the variable.
for _, v := range []string{strings.ToUpper(v), strings.ToLower(v)} {
if val, ok := env.Lookup(ctx, v); ok {
// Only set uppercase version of the variable.
environ[strings.ToUpper(v)] = val
}
}
}
return nil
}
func (m *initialize) Apply(ctx context.Context, b *bundle.Bundle) diag.Diagnostics {
tfConfig := b.Config.Bundle.Terraform
if tfConfig == nil {
tfConfig = &config.Terraform{}
b.Config.Bundle.Terraform = tfConfig
}
execPath, err := m.findExecPath(ctx, b, tfConfig)
if err != nil {
return diag.FromErr(err)
}
workingDir, err := Dir(ctx, b)
if err != nil {
return diag.FromErr(err)
}
tf, err := tfexec.NewTerraform(workingDir, execPath)
if err != nil {
return diag.FromErr(err)
}
environ, err := b.AuthEnv()
if err != nil {
return diag.FromErr(err)
}
err = inheritEnvVars(ctx, environ)
if err != nil {
return diag.FromErr(err)
}
// Set the temporary directory environment variables
err = setTempDirEnvVars(ctx, environ, b)
if err != nil {
return diag.FromErr(err)
}
// Set the proxy related environment variables
err = setProxyEnvVars(ctx, environ, b)
if err != nil {
return diag.FromErr(err)
}
// Configure environment variables for auth for Terraform to use.
log.Debugf(ctx, "Environment variables for Terraform: %s", strings.Join(maps.Keys(environ), ", "))
err = tf.SetEnv(environ)
if err != nil {
return diag.FromErr(err)
}
b.Terraform = tf
return nil
}
func Initialize() bundle.Mutator {
return &initialize{}
}