config/module: GetCopy

config/module/copy_dir.go

@@ -10,10 +10,18 @@ import (
 // copyDir copies the src directory contents into dst. Both directories
 // should already exist.
 func copyDir(dst, src string) error {
+	src, err := filepath.EvalSymlinks(src)
+	if err != nil {
+		return err
+	}
+
 	walkFn := func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
+		if path == src {
+			return nil
+		}
 
 		basePath := filepath.Base(path)
 		if strings.HasPrefix(basePath, ".") {

config/module/get.go

@@ -63,6 +63,9 @@ func Get(dst, src string) error {
 		if err != nil {
 			return err
 		}
+		if err := os.RemoveAll(tmpDir); err != nil {
+			return err
+		}
 		defer os.RemoveAll(tmpDir)
 
 		realDst = dst
@@ -104,6 +107,36 @@ func Get(dst, src string) error {
 	return nil
 }
 
+// GetCopy is the same as Get except that it downloads a copy of the
+// module represented by source.
+//
+// This copy will omit and dot-prefixed files (such as .git/, .hg/) and
+// can't be updated on its own.
+func GetCopy(dst, src string) error {
+	// Create the temporary directory to do the real Get to
+	tmpDir, err := ioutil.TempDir("", "tf")
+	if err != nil {
+		return err
+	}
+	if err := os.RemoveAll(tmpDir); err != nil {
+		return err
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// Get to that temporary dir
+	if err := Get(tmpDir, src); err != nil {
+		return err
+	}
+
+	// Make sure the destination exists
+	if err := os.MkdirAll(dst, 0755); err != nil {
+		return err
+	}
+
+	// Copy to the final location
+	return copyDir(dst, tmpDir)
+}
+
 // getRunCommand is a helper that will run a command and capture the output
 // in the case an error happens.
 func getRunCommand(cmd *exec.Cmd) error {

config/module/get_test.go

@@ -60,6 +60,20 @@ func TestGet_fileSubdir(t *testing.T) {
 	}
 }
 
+func TestGetCopy_file(t *testing.T) {
+	dst := tempDir(t)
+	u := testModule("basic")
+
+	if err := GetCopy(dst, u); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	mainPath := filepath.Join(dst, "main.tf")
+	if _, err := os.Stat(mainPath); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}
+
 func TestGetDirSubdir(t *testing.T) {
 	cases := []struct {
 		Input string