update circleci cross target

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

.circleci/config.yml

@@ -42,6 +42,7 @@ jobs:
     docker: [{image: 'docker:19.03-git'}]
     environment:
       DOCKER_BUILDKIT: 1
+      BUILDX_VERSION: "v0.5.1"
     parallelism: 3
     steps:
       - checkout
@@ -55,21 +56,14 @@ jobs:
       - run:
           name: "Docker info"
           command: docker info
-      - run:
-          name: "Cross - build image"
-          command: |
-            docker build --progress=plain -f dockerfiles/Dockerfile.cross --tag cli-builder:$CIRCLE_BUILD_NUM .
-      - run:
-          name: "Cross"
-          command: |
-            name=cross-$CIRCLE_BUILD_NUM-$CIRCLE_NODE_INDEX
-            docker run \
-                -e CROSS_GROUP=$CIRCLE_NODE_INDEX \
-                --name $name cli-builder:$CIRCLE_BUILD_NUM \
-                make cross
-            docker cp \
-                $name:/go/src/github.com/docker/cli/build \
-                /work/build
+      - run: apk add make curl
+      - run: mkdir -vp ~/.docker/cli-plugins/
+      - run: curl -fsSL --output ~/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/${BUILDX_VERSION}/buildx-${BUILDX_VERSION}.linux-amd64
+      - run: chmod a+x ~/.docker/cli-plugins/docker-buildx
+      - run: docker buildx version
+      - run: docker context create buildctx
+      - run: docker buildx create --use buildctx && docker buildx inspect --bootstrap
+      - run: GROUP_INDEX=$CIRCLE_NODE_INDEX GROUP_TOTAL=$CIRCLE_NODE_TOTAL docker buildx bake cross --progress=plain
       - store_artifacts:
           path: /work/build
 

docker-bake.hcl

@@ -32,8 +32,26 @@ target "dynbinary" {
     }
 }
 
+variable "GROUP_TOTAL" {
+    default = "1"
+}
+
+variable "GROUP_INDEX" {
+    default = "0"
+}
+
+function "platforms" {
+    params = [USE_GLIBC]
+    result = concat(["linux/amd64", "linux/386", "linux/arm64", "linux/arm", "linux/ppc64le", "linux/s390x", "darwin/amd64", "darwin/arm64", "windows/amd64", "windows/arm", "windows/386"], USE_GLIBC!=""?[]:["windows/arm64"])
+}
+
+function "glen" {
+    params = [platforms, GROUP_TOTAL]
+    result = ceil(length(platforms)/GROUP_TOTAL)
+}
+
 target "_all_platforms" {
-    platforms = concat(["linux/amd64", "linux/386", "linux/arm64", "linux/arm", "linux/ppc64le", "linux/s390x", "darwin/amd64", "darwin/arm64", "windows/amd64", "windows/arm", "windows/386"], USE_GLIBC!=""?[]:["windows/arm64"])
+    platforms = slice(platforms(USE_GLIBC), GROUP_INDEX*glen(platforms(USE_GLIBC), GROUP_TOTAL),min(length(platforms(USE_GLIBC)), (GROUP_INDEX+1)*glen(platforms(USE_GLIBC), GROUP_TOTAL)))
 }
 
 target "cross" {