From 79edfb5974628d3fdc08617519040bba83d21fbd Mon Sep 17 00:00:00 2001
From: James Ranson <james_ranson@cable.comcast.com>
Date: Thu, 23 Apr 2020 16:52:03 -0600
Subject: [PATCH] use multi-stage to fix cross-arch execution errors

---
 Dockerfile | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index 3b3da1a..f7f8740 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,17 +1,22 @@
 ARG IMAGE_ARCH=amd64
 
+# this is needed to change the file permissions on an arm64 build
+# since arm64 chown and chmod won't run on an amd64 build host
+FROM alpine:3 as permer
+ARG GOARCH=amd64
+
+COPY ./OPATH/mockster-*.linux-${GOARCH} /usr/local/bin/mockster
+RUN chown nobody:nogroup /usr/local/bin/mockster && chmod +x /usr/local/bin/mockster
+
 FROM ${IMAGE_ARCH}/alpine:3
 LABEL maintainer "The Trickster Authors <trickster-developers@googlegroups.com>"
 
-ARG GOARCH=amd64
 # expects that you are in in $src/github.com/tricksterproxy/mockster
 # and have already ran "make release" for binaries to reside in OPATH
-COPY ./OPATH/mockster-*.linux-${GOARCH} /usr/local/bin/mockster
+COPY  --from=permer /usr/local/bin/mockster /usr/local/bin/mockster
 COPY LICENSE                                /LICENSE
 COPY NOTICE                                 /NOTICE
 
-RUN chown nobody:nogroup /usr/local/bin/mockster && chmod +x /usr/local/bin/mockster
-
 USER nobody
 EXPOSE 8482
 ENTRYPOINT ["/usr/local/bin/mockster"]