From c840e7967f7815ff93929a8cd078884bc93c7117 Mon Sep 17 00:00:00 2001
From: Tonis Tiigi <tonistiigi@gmail.com>
Date: Sun, 18 Nov 2018 12:36:26 -0800
Subject: [PATCH] dockerfile: avoid urls in context filter

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
---
 frontend/dockerfile/dockerfile2llb/convert.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/frontend/dockerfile/dockerfile2llb/convert.go b/frontend/dockerfile/dockerfile2llb/convert.go
index 4c3a5262..c85cfe2c 100644
--- a/frontend/dockerfile/dockerfile2llb/convert.go
+++ b/frontend/dockerfile/dockerfile2llb/convert.go
@@ -469,7 +469,9 @@ func dispatch(d *dispatchState, cmd command, opt dispatchOpt) error {
 		err = dispatchCopy(d, c.SourcesAndDest, opt.buildContext, true, c, "", opt)
 		if err == nil {
 			for _, src := range c.Sources() {
-				d.ctxPaths[path.Join("/", filepath.ToSlash(src))] = struct{}{}
+				if !strings.HasPrefix(src, "http://") && !strings.HasPrefix(src, "https://") {
+					d.ctxPaths[path.Join("/", filepath.ToSlash(src))] = struct{}{}
+				}
 			}
 		}
 	case *instructions.LabelCommand: