Added file with correct line endings

When dealing with windows the file url format is file:///c:/
On windows a lot of git clients will convert LF to CRLF. This would be a problem where file contents are compared exactly

common/config_test.go

@@ -120,7 +120,7 @@ func TestDownloadableURL_FilePaths(t *testing.T) {
 	}()
 
 	// Test some cases with and without a schema prefix
-	for _, prefix := range []string{"", "file://"} {
+	for _, prefix := range []string{"", filePrefix} {
 		// Nonexistent file
 		_, err = DownloadableURL(prefix + "i/dont/exist")
 		if err != nil {

common/download_test.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"runtime"
 	"testing"
 )
 
@@ -56,6 +57,7 @@ func TestDownloadClient_basic(t *testing.T) {
 		Url:        ts.URL + "/basic.txt",
 		TargetPath: tf.Name(),
 	})
+
 	path, err := client.Get()
 	if err != nil {
 		t.Fatalf("err: %s", err)
@@ -352,7 +354,13 @@ func TestDownloadFileUrl(t *testing.T) {
 
 	// source_path is a file path and source is a network path
 	sourcePath := fmt.Sprintf("%s/test-fixtures/fileurl/%s", cwd, "cake")
-	source := fmt.Sprintf("file://" + sourcePath)
+
+	filePrefix := "file://"
+	if runtime.GOOS == "windows" {
+		filePrefix += "/"
+	}
+
+	source := fmt.Sprintf(filePrefix + sourcePath)
 	t.Logf("Trying to download %s", source)
 
 	config := &DownloadConfig{

common/iso_config.go

@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 
 	"github.com/mitchellh/packer/template/interpolate"
@@ -77,7 +78,13 @@ func (c *ISOConfig) Prepare(ctx *interpolate.Context) (warnings []string, errs [
 							return warnings, errs
 						}
 					case "file":
-						file, err := os.Open(u.Path)
+						path := u.Path
+
+						if runtime.GOOS == "windows" && len(path) > 2 && path[0] == '/' && path[2] == ':' {
+							path = strings.TrimLeft(path, "/")
+						}
+
+						file, err := os.Open(path)
 						if err != nil {
 							errs = append(errs, err)
 							return warnings, errs

common/iso_config_test.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"reflect"
+	"runtime"
 	"testing"
 )
 
@@ -80,7 +81,11 @@ func TestISOConfigPrepare_ISOChecksumURL(t *testing.T) {
 	i.ISOChecksum = ""
 	cs_file, _ := ioutil.TempFile("", "packer-test-")
 	ioutil.WriteFile(cs_file.Name(), []byte(cs_bsd_style), 0666)
-	i.ISOChecksumURL = fmt.Sprintf("file://%s", cs_file.Name())
+	filePrefix := "file://"
+	if runtime.GOOS == "windows" {
+		filePrefix += "/"
+	}
+	i.ISOChecksumURL = fmt.Sprintf("%s%s", filePrefix, cs_file.Name())
 	warns, err = i.Prepare(nil)
 	if len(warns) > 0 {
 		t.Fatalf("bad: %#v", warns)
@@ -98,7 +103,7 @@ func TestISOConfigPrepare_ISOChecksumURL(t *testing.T) {
 	i.ISOChecksum = ""
 	cs_file, _ = ioutil.TempFile("", "packer-test-")
 	ioutil.WriteFile(cs_file.Name(), []byte(cs_gnu_style), 0666)
-	i.ISOChecksumURL = fmt.Sprintf("file://%s", cs_file.Name())
+	i.ISOChecksumURL = fmt.Sprintf("%s%s", filePrefix, cs_file.Name())
 	warns, err = i.Prepare(nil)
 	if len(warns) > 0 {
 		t.Fatalf("bad: %#v", warns)