config looks in a plugin directory if it exists

config.go

@@ -41,6 +41,11 @@ 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
@@ -76,6 +81,17 @@ func (c *Config) Discover() error {
 		return err
 	}
 
+	// Look in the plugins directory. This will override any found
+	// in the current directory.
+	dir, err := ConfigDir()
+	if err != nil {
+		log.Printf("[ERR] Error loading config directory: %s", err)
+	} else {
+		if err := c.discover(filepath.Join(dir, "plugins")); err != nil {
+			return err
+		}
+	}
+
 	// Next, look in the same directory as the executable. Any conflicts
 	// will overwrite those found in our current directory.
 	exePath, err := osext.Executable()

config_unix.go

@@ -13,7 +13,7 @@ import (
 )
 
 func configFile() (string, error) {
-	dir, err := configDir()
+	dir, err := homeDir()
 	if err != nil {
 		return "", err
 	}
@@ -22,6 +22,15 @@ func configFile() (string, error) {
 }
 
 func configDir() (string, error) {
+	dir, err := homeDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, ".terraform.d"), nil
+}
+
+func homeDir() (string, error) {
 	// First prefer the HOME environmental variable
 	if home := os.Getenv("HOME"); home != "" {
 		log.Printf("Detected home directory from env var: %s", home)

config_windows.go

@@ -16,7 +16,7 @@ var (
 const CSIDL_APPDATA = 26
 
 func configFile() (string, error) {
-	dir, err := configDir()
+	dir, err := homeDir()
 	if err != nil {
 		return "", err
 	}
@@ -25,6 +25,15 @@ func configFile() (string, error) {
 }
 
 func configDir() (string, error) {
+	dir, err := homeDir()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(dir, "terraform.d"), nil
+}
+
+func homeDir() (string, error) {
 	b := make([]uint16, syscall.MAX_PATH)
 
 	// See: http://msdn.microsoft.com/en-us/library/windows/desktop/bb762181(v=vs.85).aspx