Add test for multi-arch builds inside Sysbox containers.

Signed-off-by: Cesar Talledo <[email protected]>

tests/multi-arch/build.bats

@@ -0,0 +1,62 @@
+#!/usr/bin/env bats
+
+#
+# Test binfmt_misc inside Sysbox containers
+#
+
+load ../helpers/run
+load ../helpers/docker
+load ../helpers/environment
+load ../helpers/sysbox-health
+load ../helpers/multiarch
+
+function setup() {
+  if ! binfmt_misc_module_present; then
+    skip "binfmt_misc module not present in kernel."
+  fi
+
+  if ! kernel_supports_binfmt_misc_namespacing; then
+    skip "binfmt_misc not namespaced in kernel."
+  fi
+}
+
+function teardown() {
+  sysbox_log_check
+}
+
+@test "Docker cross-platform build inside a Sysbox container" {
+
+  if [[ $(get_platform) != "amd64" ]]; then
+     skip "test meant for amd64 architecture"
+  fi
+
+  # Start a Sysbox container with Docker inside
+  local syscont=$(docker_run --rm ${CTR_IMG_REPO}/alpine-docker-dbg:latest tail -f /dev/null)
+
+  docker exec -d "$syscont" sh -c "dockerd > /var/log/dockerd.log 2>&1"
+  [ "$status" -eq 0 ]
+
+  wait_for_inner_dockerd $syscont
+
+  # install docker multi-arch support inside the Sysbox container
+  docker exec "$syscont" sh -c "docker run --rm --privileged multiarch/qemu-user-static --reset -p yes"
+  [ "$status" -eq 0 ]
+
+  # verify the installation worked; it takes a bit of time, so retry the command until it succeeds.
+  retry_run 20 1 __docker exec "$syscont" sh -c 'docker buildx inspect --bootstrap | grep "Platforms" | grep "linux/arm64"'
+
+  # create a dummy Dockerfile inside the container
+  docker exec "$syscont" sh -c 'mkdir -p /root/test && echo "FROM alpine:latest" > /root/test/Dockerfile'
+  [ "$status" -eq 0 ]
+
+  # use Docker buildx to build a cross-platform image
+  docker exec "$syscont" sh -c 'cd /root/test && docker buildx build --platform linux/arm64 -t alpine-arm-test:arm64 .'
+  [ "$status" -eq 0 ]
+
+  # verify the image works
+  docker exec "$syscont" sh -c 'docker run --rm --platform linux/arm64 alpine-arm-test:arm64 uname -m'
+  [ "$status" -eq 0 ]
+  [[ "$output" == "aarch64" ]]
+
+  docker_stop "$syscont"
+}