tar: use absolute path as srcPath when generating the tar stream

fsouza · fsouza · commit fcb9d66987b5 · 2018-02-11T13:12:31.000-05:00
diff --git a/tar.go b/tar.go
@@ -18,6 +18,11 @@ import (
 )
 
 func createTarStream(srcPath, dockerfilePath string) (io.ReadCloser, error) {
+	srcPath, err := filepath.Abs(srcPath)
+	if err != nil {
+		return nil, err
+	}
+
 	excludes, err := parseDockerignore(srcPath)
 	if err != nil {
 		return nil, err
