read Dockerfile into memory before parsing, to facilitate regexp preprocessing

buildfile.go

@@ -1,7 +1,6 @@
 package docker
 
 import (
-	"bufio"
 	"encoding/json"
 	"fmt"
 	"github.com/dotcloud/docker/utils"
@@ -459,6 +458,8 @@ func (b *buildFile) commit(id string, autoCmd []string, comment string) error {
 	return nil
 }
 
+var multilineRegex = regexp.MustCompile("\\.*\n")
+
 func (b *buildFile) Build(context io.Reader) (string, error) {
 	// FIXME: @creack any reason for using /tmp instead of ""?
 	// FIXME: @creack "name" is a terrible variable name
@@ -471,22 +472,26 @@ func (b *buildFile) Build(context io.Reader) (string, error) {
 	}
 	defer os.RemoveAll(name)
 	b.context = name
-	dockerfile, err := os.Open(path.Join(name, "Dockerfile"))
-	if err != nil {
+	filename := path.Join(name, "Dockerfile")
+	if _, err := os.Stat(filename); os.IsNotExist(err) {
 		return "", fmt.Errorf("Can't build a directory with no Dockerfile")
 	}
-	// FIXME: "file" is also a terrible variable name ;)
-	file := bufio.NewReader(dockerfile)
+	fileBytes, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return "", err
+	}
+	dockerfile := string(fileBytes)
+	// dockerfile = multilineRegex.ReplaceAllString(dockerfile, " ")
 	stepN := 0
-	for {
-		line, err := file.ReadString('\n')
-		if err != nil {
-			if err == io.EOF && line == "" {
-				break
-			} else if err != io.EOF {
-				return "", err
-			}
-		}
+	for _, line := range strings.Split(dockerfile, "\n") {
+		/*		line, err := dockerfile.ReadString('\n')
+				if err != nil {
+					if err == io.EOF && line == "" {
+						break
+					} else if err != io.EOF {
+						return "", err
+					}
+				}*/
 		line = strings.Trim(strings.Replace(line, "\t", " ", -1), " \t\r\n")
 		// Skip comments and empty line
 		if len(line) == 0 || line[0] == '#' {