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config.go
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config.go
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//go:generate go run ./scripts/generate-plugins.go
package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"github.com/hashicorp/hcl"
"github.com/hashicorp/terraform/command"
)
const pluginCacheDirEnvVar = "TF_PLUGIN_CACHE_DIR"
// Config is the structure of the configuration for the Terraform CLI.
//
// This is not the configuration for Terraform itself. That is in the
// "config" package.
type Config struct {
Providers map[string]string
Provisioners map[string]string
DisableCheckpoint bool `hcl:"disable_checkpoint"`
DisableCheckpointSignature bool `hcl:"disable_checkpoint_signature"`
// If set, enables local caching of plugins in this directory to
// avoid repeatedly re-downloading over the Internet.
PluginCacheDir string `hcl:"plugin_cache_dir"`
Credentials map[string]map[string]interface{} `hcl:"credentials"`
CredentialsHelpers map[string]*ConfigCredentialsHelper `hcl:"credentials_helper"`
}
// ConfigCredentialsHelper is the structure of the "credentials_helper"
// nested block within the CLI configuration.
type ConfigCredentialsHelper struct {
Args []string `hcl:"args"`
}
// BuiltinConfig is the built-in defaults for the configuration. These
// can be overridden by user configurations.
var BuiltinConfig Config
// PluginOverrides are paths that override discovered plugins, set from
// the config file.
var PluginOverrides command.PluginOverrides
// ConfigFile returns the default path to the configuration file.
//
// On Unix-like systems this is the ".terraformrc" file in the home directory.
// On Windows, this is the "terraform.rc" file in the application data
// directory.
func ConfigFile() (string, error) {
return configFile()
}
// ConfigDir returns the configuration directory for Terraform.
func ConfigDir() (string, error) {
return configDir()
}
// LoadConfig loads the CLI configuration from ".terraformrc" files.
func LoadConfig(path string) (*Config, error) {
// Read the HCL file and prepare for parsing
d, err := ioutil.ReadFile(path)
if err != nil {
return nil, fmt.Errorf(
"Error reading %s: %s", path, err)
}
// Parse it
obj, err := hcl.Parse(string(d))
if err != nil {
return nil, fmt.Errorf(
"Error parsing %s: %s", path, err)
}
// Build up the result
var result Config
if err := hcl.DecodeObject(&result, obj); err != nil {
return nil, err
}
// Replace all env vars
for k, v := range result.Providers {
result.Providers[k] = os.ExpandEnv(v)
}
for k, v := range result.Provisioners {
result.Provisioners[k] = os.ExpandEnv(v)
}
if result.PluginCacheDir != "" {
result.PluginCacheDir = os.ExpandEnv(result.PluginCacheDir)
}
return &result, nil
}
// EnvConfig returns a Config populated from environment variables.
//
// Any values specified in this config should override those set in the
// configuration file.
func EnvConfig() *Config {
config := &Config{}
if envPluginCacheDir := os.Getenv(pluginCacheDirEnvVar); envPluginCacheDir != "" {
// No Expandenv here, because expanding environment variables inside
// an environment variable would be strange and seems unnecessary.
// (User can expand variables into the value while setting it using
// standard shell features.)
config.PluginCacheDir = envPluginCacheDir
}
return config
}
// Merge merges two configurations and returns a third entirely
// new configuration with the two merged.
func (c1 *Config) Merge(c2 *Config) *Config {
var result Config
result.Providers = make(map[string]string)
result.Provisioners = make(map[string]string)
for k, v := range c1.Providers {
result.Providers[k] = v
}
for k, v := range c2.Providers {
if v1, ok := c1.Providers[k]; ok {
log.Printf("[INFO] Local %s provider configuration '%s' overrides '%s'", k, v, v1)
}
result.Providers[k] = v
}
for k, v := range c1.Provisioners {
result.Provisioners[k] = v
}
for k, v := range c2.Provisioners {
if v1, ok := c1.Provisioners[k]; ok {
log.Printf("[INFO] Local %s provisioner configuration '%s' overrides '%s'", k, v, v1)
}
result.Provisioners[k] = v
}
result.DisableCheckpoint = c1.DisableCheckpoint || c2.DisableCheckpoint
result.DisableCheckpointSignature = c1.DisableCheckpointSignature || c2.DisableCheckpointSignature
result.PluginCacheDir = c1.PluginCacheDir
if result.PluginCacheDir == "" {
result.PluginCacheDir = c2.PluginCacheDir
}
if (len(c1.Credentials) + len(c2.Credentials)) > 0 {
result.Credentials = make(map[string]map[string]interface{})
for host, creds := range c1.Credentials {
result.Credentials[host] = creds
}
for host, creds := range c2.Credentials {
// We just clobber an entry from the other file right now. Will
// improve on this later using the more-robust merging behavior
// built in to HCL2.
result.Credentials[host] = creds
}
}
if (len(c1.CredentialsHelpers) + len(c2.CredentialsHelpers)) > 0 {
result.CredentialsHelpers = make(map[string]*ConfigCredentialsHelper)
for name, helper := range c1.CredentialsHelpers {
result.CredentialsHelpers[name] = helper
}
for name, helper := range c2.CredentialsHelpers {
result.CredentialsHelpers[name] = helper
}
}
return &result
}