multi-arch images with rules_oci

README.md

@@ -86,6 +86,46 @@ Loaded image: projects/go_web:oci_tarball
 ### Deploying Go web app to Heroku
 
 ```
-➜ bazel** run projects/go_web:bazoku-deployment --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64
+➜ bazel run projects/go_web:bazoku-deployment --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64
 ...
 ```
+
+### Publishing Multi-arch Docker image to DockerHub
+
+```
+➜ bazel run examples/multi_arch_go:publish
+...
+2023/08/18 16:41:38 registry.hub.docker.com/krisfoster96/monorepo-go-web:6: digest: sha256:c50ffe127f340301993cbc323e510211d6dab9a547aa1b1a81035426e4e9d1b1 size: 648
+```
+
+```
+➜ docker buildx imagetools inspect registry.hub.docker.com/krisfoster96/monorepo-go-web:6
+Name:      registry.hub.docker.com/krisfoster96/monorepo-go-web:6
+MediaType: application/vnd.oci.image.index.v1+json
+Digest:    sha256:c50ffe127f340301993cbc323e510211d6dab9a547aa1b1a81035426e4e9d1b1
+
+Manifests: 
+  Name:      registry.hub.docker.com/krisfoster96/monorepo-go-web:6@sha256:18b8c8a2606c3daf70a86db275c850080353bf5bd79a7045cca6732736b693c3
+  MediaType: application/vnd.oci.image.manifest.v1+json
+  Platform:  linux/arm64
+
+  Name:      registry.hub.docker.com/krisfoster96/monorepo-go-web:6@sha256:fbc6e9ca088bbb683c0743b16aa98b51583e7af8564febd26154e638b12b484a
+  MediaType: application/vnd.oci.image.manifest.v1+json
+  Platform:  linux/amd64
+```
+
+```
+➜ docker run --platform linux/arm64 registry.hub.docker.com/krisfoster96/monorepo-go-web:6
+...
+2023/08/18 15:56:08 running program's operating system target: linux
+2023/08/18 15:56:08 running program's architecture target: arm64
+2023/08/18 15:56:08 Going to listen on port: 8080
+```
+
+```
+➜ docker run --platform linux/amd64 registry.hub.docker.com/krisfoster96/monorepo-go-web:6
+...
+2023/08/18 15:56:08 running program's operating system target: linux
+2023/08/18 15:56:08 running program's architecture target: amd64
+2023/08/18 15:56:08 Going to listen on port: 8080
+```

WORKSPACE.bazel

@@ -46,7 +46,6 @@ http_archive(
     urls = ["https://github.com/bazelbuild/rules_nodejs/releases/download/5.7.0/rules_nodejs-5.7.0.tar.gz"],
 )
 
-
 http_archive(
     name = "rules_oci",
     sha256 = "176e601d21d1151efd88b6b027a24e782493c5d623d8c6211c7767f306d655c8",
@@ -206,7 +205,7 @@ oci_pull(
     name = "distroless_base",
     image = "gcr.io/distroless/base-debian11",
     tag = "debug",
-    platforms = ["linux/amd64"],
+    platforms = ["linux/amd64", "linux/arm64"],
 )
 
 oci_pull(

projects/go_web/BUILD.bazel

@@ -1,6 +1,6 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
-load("@rules_oci//oci:defs.bzl", "oci_image", "oci_tarball")
+load("@rules_oci//oci:defs.bzl", "oci_image", "oci_tarball", "oci_image_index", "oci_push")
 load("@bazoku//:bazoku.bzl", "bazoku")
 
 go_library(
@@ -33,10 +33,57 @@ oci_image(
     tars = [":tar"],
 )
 
+archs = ["arm64", "amd64"]
+
+[
+    go_binary(
+        name = "go_web_" + arch,
+        embed = [":go_web_lib"],
+        visibility = ["//visibility:public"],
+        goos = "linux",
+        goarch = arch,
+    )
+    for arch in archs
+]
+
+[
+    pkg_tar(
+        name = "tar_" + arch,
+        srcs = [":go_web_" + arch],
+    )
+    for arch in archs
+]
+
+[
+    oci_image(
+        name = "oci_image_" + arch,
+        base = "@distroless_base_linux_" + arch,
+        # with :debug distroless image, entrypoint can be changed to "sh" for debug purposes
+        entrypoint = ["go_web_" + arch + "_/go_web_" + arch],
+        tars = [":tar_" + arch],
+    )
+    for arch in archs
+]
+
+oci_image_index(
+    name = "multi_arch_image",
+    images = [
+        ":oci_image_arm64",
+        ":oci_image_amd64"
+    ],
+)
+
+oci_push(
+    name = "publish",
+    repository = "registry.hub.docker.com/krisfoster96/monorepo-go-web",
+    remote_tags = ["6"],
+    image = ":multi_arch_image",
+)
+
 oci_tarball(
-    name = "oci_tarball",
-    image = ":oci_image",
-    repo_tags = ["projects/go_web:oci_tarball"],
+    name = "oci_tarball_amd64",
+    image = ":oci_image_amd64",
+    repo_tags = ["projects/go_web:oci_tarball_amd64"],
 )
 
 bazoku(

projects/go_web/main.go

@@ -4,6 +4,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"runtime"
 
 	"github.com/gorilla/mux"
 	"github.com/kriscfoster/multi-language-bazel-monorepo/projects/go_hello_world"
@@ -29,6 +30,8 @@ func main() {
 	r.HandleFunc("/", YourHandler)
 	// Bind to a port and pass our router in
 	port := getPort()
+	log.Println("running program's operating system target: " +  runtime.GOOS)
+	log.Println("running program's architecture target: " + runtime.GOARCH)
 	log.Println("Going to listen on port: " + port)
 	log.Fatal(http.ListenAndServe(":"+port, r))
 }