terraform/command/meta_config.go

418 lines
13 KiB
Go

package command
import (
"fmt"
"os"
"path/filepath"
"sort"
"github.com/hashicorp/hcl2/hcl/hclsyntax"
"github.com/hashicorp/hcl2/hcl"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/configs/configload"
"github.com/hashicorp/terraform/configs/configschema"
"github.com/hashicorp/terraform/terraform"
"github.com/hashicorp/terraform/tfdiags"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/convert"
)
// normalizePath normalizes a given path so that it is, if possible, relative
// to the current working directory. This is primarily used to prepare
// paths used to load configuration, because we want to prefer recording
// relative paths in source code references within the configuration.
func (m *Meta) normalizePath(path string) string {
var err error
// First we will make it absolute so that we have a consistent place
// to start.
path, err = filepath.Abs(path)
if err != nil {
// We'll just accept what we were given, then.
return path
}
cwd, err := os.Getwd()
if err != nil || !filepath.IsAbs(cwd) {
return path
}
ret, err := filepath.Rel(cwd, path)
if err != nil {
return path
}
return ret
}
// loadConfig reads a configuration from the given directory, which should
// contain a root module and have already have any required descendent modules
// installed.
func (m *Meta) loadConfig(rootDir string) (*configs.Config, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
rootDir = m.normalizePath(rootDir)
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return nil, diags
}
config, hclDiags := loader.LoadConfig(rootDir)
diags = diags.Append(hclDiags)
return config, diags
}
// loadSingleModule reads configuration from the given directory and returns
// a description of that module only, without attempting to assemble a module
// tree for referenced child modules.
//
// Most callers should use loadConfig. This method exists to support early
// initialization use-cases where the root module must be inspected in order
// to determine what else needs to be installed before the full configuration
// can be used.
func (m *Meta) loadSingleModule(dir string) (*configs.Module, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
dir = m.normalizePath(dir)
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return nil, diags
}
module, hclDiags := loader.Parser().LoadConfigDir(dir)
diags = diags.Append(hclDiags)
return module, diags
}
// dirIsConfigPath checks if the given path is a directory that contains at
// least one Terraform configuration file (.tf or .tf.json), returning true
// if so.
//
// In the unlikely event that the underlying config loader cannot be initalized,
// this function optimistically returns true, assuming that the caller will
// then do some other operation that requires the config loader and get an
// error at that point.
func (m *Meta) dirIsConfigPath(dir string) bool {
loader, err := m.initConfigLoader()
if err != nil {
return true
}
return loader.IsConfigDir(dir)
}
// loadBackendConfig reads configuration from the given directory and returns
// the backend configuration defined by that module, if any. Nil is returned
// if the specified module does not have an explicit backend configuration.
//
// This is a convenience method for command code that will delegate to the
// configured backend to do most of its work, since in that case it is the
// backend that will do the full configuration load.
//
// Although this method returns only the backend configuration, at present it
// actually loads and validates the entire configuration first. Therefore errors
// returned may be about other aspects of the configuration. This behavior may
// change in future, so callers must not rely on it. (That is, they must expect
// that a call to loadSingleModule or loadConfig could fail on the same
// directory even if loadBackendConfig succeeded.)
func (m *Meta) loadBackendConfig(rootDir string) (*configs.Backend, tfdiags.Diagnostics) {
mod, diags := m.loadSingleModule(rootDir)
return mod.Backend, diags
}
// loadValuesFile loads a file that defines a single map of key/value pairs.
// This is the format used for "tfvars" files.
func (m *Meta) loadValuesFile(filename string) (map[string]cty.Value, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
filename = m.normalizePath(filename)
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return nil, diags
}
vals, hclDiags := loader.Parser().LoadValuesFile(filename)
diags = diags.Append(hclDiags)
return vals, diags
}
// loadHCLFile reads an arbitrary HCL file and returns the unprocessed body
// representing its toplevel. Most callers should use one of the more
// specialized "load..." methods to get a higher-level representation.
func (m *Meta) loadHCLFile(filename string) (hcl.Body, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
filename = m.normalizePath(filename)
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return nil, diags
}
body, hclDiags := loader.Parser().LoadHCLFile(filename)
diags = diags.Append(hclDiags)
return body, diags
}
// installModules reads a root module from the given directory and attempts
// recursively install all of its descendent modules.
//
// The given hooks object will be notified of installation progress, which
// can then be relayed to the end-user. The moduleUiInstallHooks type in
// this package has a reasonable implementation for displaying notifications
// via a provided cli.Ui.
func (m *Meta) installModules(rootDir string, upgrade bool, hooks configload.InstallHooks) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
rootDir = m.normalizePath(rootDir)
err := os.MkdirAll(m.modulesDir(), os.ModePerm)
if err != nil {
diags = diags.Append(fmt.Errorf("failed to create local modules directory: %s", err))
return diags
}
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return diags
}
hclDiags := loader.InstallModules(rootDir, upgrade, hooks)
diags = diags.Append(hclDiags)
return diags
}
// initDirFromModule initializes the given directory (which should be
// pre-verified as empty by the caller) by copying the source code from the
// given module address.
//
// Internally this runs similar steps to installModules.
// The given hooks object will be notified of installation progress, which
// can then be relayed to the end-user. The moduleUiInstallHooks type in
// this package has a reasonable implementation for displaying notifications
// via a provided cli.Ui.
func (m *Meta) initDirFromModule(targetDir string, addr string, hooks configload.InstallHooks) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
targetDir = m.normalizePath(targetDir)
loader, err := m.initConfigLoader()
if err != nil {
diags = diags.Append(err)
return diags
}
hclDiags := loader.InitDirFromModule(targetDir, addr, hooks)
diags = diags.Append(hclDiags)
return diags
}
// inputForSchema uses interactive prompts to try to populate any
// not-yet-populated required attributes in the given object value to
// comply with the given schema.
//
// An error will be returned if input is disabled for this meta or if
// values cannot be obtained for some other operational reason. Errors are
// not returned for invalid input since the input loop itself will report
// that interactively.
//
// It is not guaranteed that the result will be valid, since certain attribute
// types and nested blocks are not supported for input.
//
// The given value must conform to the given schema. If not, this method will
// panic.
func (m *Meta) inputForSchema(given cty.Value, schema *configschema.Block) (cty.Value, error) {
if given.IsNull() || !given.IsKnown() {
// This is not reasonable input, but we'll tolerate it anyway and
// just pass it through for the caller to handle downstream.
return given, nil
}
givenVals := given.AsValueMap()
retVals := make(map[string]cty.Value, len(givenVals))
names := make([]string, 0, len(schema.Attributes))
for name, attrS := range schema.Attributes {
retVals[name] = givenVals[name]
if givenVal := givenVals[name]; attrS.Required && givenVal.IsNull() && attrS.Type.IsPrimitiveType() {
names = append(names, name)
}
}
sort.Strings(names)
input := m.UIInput()
for _, name := range names {
attrS := schema.Attributes[name]
for {
strVal, err := input.Input(&terraform.InputOpts{
Id: name,
Query: name,
Description: attrS.Description,
})
if err != nil {
return cty.UnknownVal(schema.ImpliedType()), fmt.Errorf("%s: %s", name, err)
}
val := cty.StringVal(strVal)
val, err = convert.Convert(val, attrS.Type)
if err != nil {
m.showDiagnostics(fmt.Errorf("Invalid value: %s", err))
continue
}
retVals[name] = val
break
}
}
return cty.ObjectVal(retVals), nil
}
// configSources returns the source cache from the receiver's config loader,
// which the caller must not modify.
//
// If a config loader has not yet been instantiated then no files could have
// been loaded already, so this method returns a nil map in that case.
func (m *Meta) configSources() map[string][]byte {
if m.configLoader == nil {
return nil
}
return m.configLoader.Sources()
}
func (m *Meta) modulesDir() string {
return filepath.Join(m.DataDir(), "modules")
}
// registerSynthConfigSource allows commands to add synthetic additional source
// buffers to the config loader's cache of sources (as returned by
// configSources), which is useful when a command is directly parsing something
// from the command line that may produce diagnostics, so that diagnostic
// snippets can still be produced.
//
// If this is called before a configLoader has been initialized then it will
// try to initialize the loader but ignore any initialization failure, turning
// the call into a no-op. (We presume that a caller will later call a different
// function that also initializes the config loader as a side effect, at which
// point those errors can be returned.)
func (m *Meta) registerSynthConfigSource(filename string, src []byte) {
loader, err := m.initConfigLoader()
if err != nil || loader == nil {
return // treated as no-op, since this is best-effort
}
loader.Parser().ForceFileSource(filename, src)
}
// initConfigLoader initializes the shared configuration loader if it isn't
// already initialized.
//
// If the loader cannot be created for some reason then an error is returned
// and no loader is created. Subsequent calls will presumably see the same
// error. Loader initialization errors will tend to prevent any further use
// of most Terraform features, so callers should report any error and safely
// terminate.
func (m *Meta) initConfigLoader() (*configload.Loader, error) {
if m.configLoader == nil {
loader, err := configload.NewLoader(&configload.Config{
ModulesDir: m.modulesDir(),
Services: m.Services,
Creds: m.Credentials,
})
if err != nil {
return nil, err
}
m.configLoader = loader
}
return m.configLoader, nil
}
// configValueFromCLI parses a configuration value that was provided in a
// context in the CLI where only strings can be provided, such as on the
// command line or in an environment variable, and returns the resulting
// value.
func configValueFromCLI(synthFilename, rawValue string, wantType cty.Type) (cty.Value, tfdiags.Diagnostics) {
var diags tfdiags.Diagnostics
switch {
case wantType.IsPrimitiveType():
// Primitive types are handled as conversions from string.
val := cty.StringVal(rawValue)
var err error
val, err = convert.Convert(val, wantType)
if err != nil {
diags = diags.Append(tfdiags.Sourceless(
tfdiags.Error,
"Invalid backend configuration value",
fmt.Sprintf("Invalid backend configuration argument %s: %s", synthFilename, err),
))
val = cty.DynamicVal // just so we return something valid-ish
}
return val, diags
default:
// Non-primitives are parsed as HCL expressions
src := []byte(rawValue)
expr, hclDiags := hclsyntax.ParseExpression(src, synthFilename, hcl.Pos{Line: 1, Column: 1})
diags = diags.Append(hclDiags)
if hclDiags.HasErrors() {
return cty.DynamicVal, diags
}
val, hclDiags := expr.Value(nil)
diags = diags.Append(hclDiags)
if hclDiags.HasErrors() {
val = cty.DynamicVal
}
return val, diags
}
}
// rawFlags is a flag.Value implementation that just appends raw flag
// names and values to a slice.
type rawFlags struct {
flagName string
items *[]rawFlag
}
func newRawFlags(flagName string) rawFlags {
var items []rawFlag
return rawFlags{
flagName: flagName,
items: &items,
}
}
func (f rawFlags) AllItems() []rawFlag {
return *f.items
}
func (f rawFlags) Alias(flagName string) rawFlags {
return rawFlags{
flagName: flagName,
items: f.items,
}
}
func (f rawFlags) String() string {
return ""
}
func (f rawFlags) Set(str string) error {
*f.items = append(*f.items, rawFlag{
Name: f.flagName,
Value: str,
})
return nil
}
type rawFlag struct {
Name string
Value string
}
func (f rawFlag) String() string {
return fmt.Sprintf("%s=%q", f.Name, f.Value)
}