Remove gox, add support for s390x

Signed-off-by: Daniel Nephin <dnephin@docker.com>

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" \
     ;

scripts/build/linux-cross

@@ -1,19 +0,0 @@
-#!/usr/bin/env bash
-#
-# Build static linux binary for multiple architectures
-#
-
-set -eu -o pipefail
-
-source ./scripts/build/.variables
-
-CROSS_OSARCH="linux/amd64 linux/arm linux/ppc64le"
-
-# Not yet supported by gox
-# linux/s390x
-
-echo "Building all linux binaries"
-gox -output build/docker-{{.OS}}-{{.Arch}} \
-    -osarch "${CROSS_OSARCH}" \
-	--ldflags "${LDFLAGS}" \
-	"${SOURCE}"