Remove gox, add support for s390x

dockerfiles/Dockerfile.cross

@@ -11,10 +11,6 @@ RUN     apt-get update -qq && apt-get install -y -q \
             parallel \
             ;
 
-RUN     go get github.com/mitchellh/gox && \
-        cp /go/bin/gox /usr/bin && \
-        rm -rf /go/src/* /go/pkg/* /go/bin/*
-
 COPY    dockerfiles/osx-cross.sh /tmp/
 RUN     /tmp/osx-cross.sh
 ENV     PATH /osxcross/target/bin:$PATH

dockerfiles/Dockerfile.dev

@@ -7,10 +7,6 @@ RUN     go get github.com/LK4D4/vndr && \
         cp /go/bin/vndr /usr/bin && \
         rm -rf /go/src/* /go/pkg/* /go/bin/*
 
-RUN     go get github.com/mitchellh/gox && \
-        cp /go/bin/gox /usr/bin && \
-        rm -rf /go/src/* /go/pkg/* /go/bin/*
-
 RUN     go get github.com/jteeuwen/go-bindata/go-bindata && \
         cp /go/bin/go-bindata /usr/bin && \
         rm -rf /go/src/* /go/pkg/* /go/bin/*

scripts/build/.variables

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
-
 set -eu
 
 VERSION=${VERSION:-"unknown-version"}
@@ -14,5 +13,7 @@ export LDFLAGS="\
     ${LDFLAGS:-} \
 "
 
-export TARGET="build/docker-$(go env GOHOSTOS)-$(go env GOHOSTARCH)"
+GOOS="${GOOS:-$(go env GOHOSTOS)}"
+GOARCH="${GOARCH:-$(go env GOHOSTARCH)}"
+export TARGET="build/docker-$GOOS-$GOARCH"
 export SOURCE="github.com/docker/cli/cmd/docker"

scripts/build/cross

@@ -1,12 +1,18 @@
 #!/usr/bin/env bash
+#
+# Build a binary for all supported platforms
+#
 
 set -eu -o pipefail
 
 BUILDDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
-echo "Building all binaries"
+echo "Building binaries for all platforms"
 SHELL=/bin/bash parallel ::: \
-    "$BUILDDIR/linux-cross" \
     "$BUILDDIR/windows" \
     "$BUILDDIR/osx" \
+    "GOOS=linux GOARCH=amd64   $BUILDDIR/binary" \
+    "GOOS=linux GOARCH=arm     $BUILDDIR/binary" \
+    "GOOS=linux GOARCH=ppc64le $BUILDDIR/binary" \
+    "GOOS=linux GOARCH=s390x   $BUILDDIR/binary" \
     ;