Remove package daemonbuilder.

Currently, daemonbuilder package (part of daemon) implemented the
builder backend. However, it was a very thin wrapper around daemon
methods and caused an implementation dependency for api/server build
endpoint. api/server buildrouter should only know about the backend
implementing the /build API endpoint.

Removing daemonbuilder involved moving build specific methods to
respective files in the daemon, where they fit naturally.

Signed-off-by: Anusha Ragunathan <anusha@docker.com>

daemon/archive_unix.go

@@ -2,7 +2,11 @@
 
 package daemon
 
-import "github.com/docker/docker/container"
+import (
+	"github.com/docker/docker/container"
+	"os"
+	"path/filepath"
+)
 
 // checkIfPathIsInAVolume checks if the path is in a volume. If it is, it
 // cannot be in a read-only volume. If it  is not in a volume, the container
@@ -19,3 +23,35 @@ func checkIfPathIsInAVolume(container *container.Container, absPath string) (boo
 	}
 	return toVolume, nil
 }
+
+func fixPermissions(source, destination string, uid, gid int, destExisted bool) error {
+	// If the destination didn't already exist, or the destination isn't a
+	// directory, then we should Lchown the destination. Otherwise, we shouldn't
+	// Lchown the destination.
+	destStat, err := os.Stat(destination)
+	if err != nil {
+		// This should *never* be reached, because the destination must've already
+		// been created while untar-ing the context.
+		return err
+	}
+	doChownDestination := !destExisted || !destStat.IsDir()
+
+	// We Walk on the source rather than on the destination because we don't
+	// want to change permissions on things we haven't created or modified.
+	return filepath.Walk(source, func(fullpath string, info os.FileInfo, err error) error {
+		// Do not alter the walk root iff. it existed before, as it doesn't fall under
+		// the domain of "things we should chown".
+		if !doChownDestination && (source == fullpath) {
+			return nil
+		}
+
+		// Path is prefixed by source: substitute with destination instead.
+		cleaned, err := filepath.Rel(source, fullpath)
+		if err != nil {
+			return err
+		}
+
+		fullpath = filepath.Join(destination, cleaned)
+		return os.Lchown(fullpath, uid, gid)
+	})
+}