Run the hello test on multiple architectures

.travis.yml

@@ -1,21 +1,30 @@
-sudo: required
-
-dist: trusty
-
-services:
-  - docker
-
-language:
-  - go
-
+dist: bionic
+language: go
 go:
-  - '1.14'
   - '1.15'
-
 git:
   depth: 1
 
-install: true # skipping the default go dependencies install step
+jobs:
+  include:
+   - arch: amd64
+   - arch: arm64
+   - arch: s390x
+   - arch: ppc64le
 
 script:
-  - bash integration_test.sh
+  # Make sure ko compiles for the right architecture.
+  - eval $(go env)
+  - go install -mod=vendor ./cmd/ko
+  # Try with all, and GOOS/GOARCH set.
+  - GOOS=${GOOS} GOARCH=${GOARCH} KO_DOCKER_REPO=ko.local ko publish --platform=all -B ./cmd/ko/test
+  - docker run -i ko.local/test -wait=false
+  # Try with the appropriate platform.
+  - KO_DOCKER_REPO=ko.local ko publish --platform=${GOOS}/${GOARCH} -B ./cmd/ko/test
+  - docker run -i ko.local/test -wait=false
+  # Try with just GOOS/GOARCH
+  - GOOS=${GOOS} GOARCH=${GOARCH} KO_DOCKER_REPO=ko.local ko publish -B ./cmd/ko/test
+  - docker run -i ko.local/test -wait=false
+
+notifications:
+  email: false

cmd/ko/test/main.go

@@ -15,6 +15,7 @@
 package main
 
 import (
+	"flag"
 	"io/ioutil"
 	"log"
 	"os"
@@ -23,7 +24,13 @@ import (
 	"syscall"
 )
 
+var (
+	wait = flag.Bool("wait", true, "Whether to wait for SIGTERM")
+)
+
 func main() {
+	flag.Parse()
+
 	dp := os.Getenv("KO_DATA_PATH")
 	file := filepath.Join(dp, "kenobi")
 	bytes, err := ioutil.ReadFile(file)
@@ -40,7 +47,9 @@ func main() {
 	log.Print(string(bytes))
 
 	// Cause the pod to "hang" to allow us to check for a readiness state.
-	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, syscall.SIGTERM)
-	<-sigs
+	if *wait {
+		sigs := make(chan os.Signal, 1)
+		signal.Notify(sigs, syscall.SIGTERM)
+		<-sigs
+	}
 }

pkg/publish/daemon.go

@@ -17,6 +17,7 @@ package publish
 import (
 	"fmt"
 	"log"
+	"os"
 	"strings"
 
 	"github.com/google/go-containerregistry/pkg/name"
@@ -47,9 +48,43 @@ func (d *demon) Publish(br build.Result, s string) (name.Reference, error) {
 	// https://github.com/google/go-containerregistry/issues/212
 	s = strings.ToLower(s)
 
-	// There's no way to write an index to a daemon, so attempt to downcast it to an image.
-	img, ok := br.(v1.Image)
-	if !ok {
+	// There's no way to write an index to a kind, so attempt to downcast it to an image.
+	var img v1.Image
+	switch i := br.(type) {
+	case v1.Image:
+		img = i
+	case v1.ImageIndex:
+		im, err := i.IndexManifest()
+		if err != nil {
+			return nil, err
+		}
+		goos, goarch := os.Getenv("GOOS"), os.Getenv("GOARCH")
+		if goos == "" {
+			goos = "linux"
+		}
+		if goarch == "" {
+			goarch = "amd64"
+		}
+		for _, manifest := range im.Manifests {
+			if manifest.Platform == nil {
+				continue
+			}
+			if manifest.Platform.OS != goos {
+				continue
+			}
+			if manifest.Platform.Architecture != goarch {
+				continue
+			}
+			img, err = i.Image(manifest.Digest)
+			if err != nil {
+				return nil, err
+			}
+			break
+		}
+		if img == nil {
+			return nil, fmt.Errorf("failed to find %s/%s image in index for image: %v", goos, goarch, s)
+		}
+	default:
 		return nil, fmt.Errorf("failed to interpret %s result as image: %v", s, br)
 	}