fix resolve link for dirs with trailing /

pkg/commands/copy.go

@@ -67,7 +67,7 @@ func (c *CopyCommand) ExecuteCommand(config *v1.Config, buildArgs *dockerfile.Bu
 		fullPath := filepath.Join(c.buildcontext, src)
 		fi, err := os.Lstat(fullPath)
 		if err != nil {
-			return err
+			return errors.Wrap(err, "could not copy source")
 		}
 		if fi.IsDir() && !strings.HasSuffix(fullPath, string(os.PathSeparator)) {
 			fullPath += "/"

pkg/executor/composite_cache.go

@@ -24,6 +24,7 @@ import (
 	"strings"
 
 	"github.com/GoogleContainerTools/kaniko/pkg/util"
+	"github.com/pkg/errors"
 )
 
 // NewCompositeCache returns an initialized composite cache object.
@@ -58,7 +59,7 @@ func (s *CompositeCache) AddPath(p, context string) error {
 	sha := sha256.New()
 	fi, err := os.Lstat(p)
 	if err != nil {
-		return err
+		return errors.Wrap(err, "could not add path")
 	}
 
 	if fi.Mode().IsDir() {

pkg/filesystem/resolve.go

@@ -127,7 +127,7 @@ func resolveSymlinkAncestor(path string) (string, error) {
 	}
 
 	last := ""
-	newPath := path
+	newPath := filepath.Clean(path)
 
 loop:
 	for newPath != "/" {
@@ -149,7 +149,6 @@ loop:
 			if err != nil {
 				return "", err
 			}
-
 			if target != newPath {
 				last = filepath.Base(newPath)
 				newPath = filepath.Dir(newPath)
@@ -158,7 +157,6 @@ loop:
 			}
 		}
 	}
-
 	newPath = filepath.Join(newPath, last)
 	return filepath.Clean(newPath), nil
 }

pkg/filesystem/resolve_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package filesystem
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -234,6 +235,27 @@ func Test_resolveSymlinkAncestor(t *testing.T) {
 		}
 	})
 
+	t.Run("dir ends with / is not a symlink", func(t *testing.T) {
+		testDir, _ := setupDirs(t)
+		defer os.RemoveAll(testDir)
+
+		linkDir := filepath.Join(testDir, "var", "www")
+		if err := os.MkdirAll(linkDir, 0777); err != nil {
+			t.Fatal(err)
+		}
+
+		expected := linkDir
+
+		actual, err := resolveSymlinkAncestor(fmt.Sprintf("%s/", linkDir))
+		if err != nil {
+			t.Errorf("expected err to be nil but was %s", err)
+		}
+
+		if actual != expected {
+			t.Errorf("expected result to be %s not %s", expected, actual)
+		}
+	})
+
 	t.Run("path is a dead symlink", func(t *testing.T) {
 		testDir, targetPath := setupDirs(t)
 		defer os.RemoveAll(testDir)

pkg/util/fs_util.go

@@ -577,8 +577,7 @@ func CopyDir(src, dest, buildcontext string, uid, gid int64) ([]string, error) {
 		fullPath := filepath.Join(src, file)
 		fi, err := os.Lstat(fullPath)
 		if err != nil {
-			fmt.Println(" i am returning from here this", err)
-			return nil, err
+			return nil, errors.Wrap(err, "copying dir")
 		}
 		if ExcludeFile(fullPath, buildcontext) {
 			logrus.Debugf("%s found in .dockerignore, ignoring", src)