include riscv64 in target architectures

Signed-off-by: Avi Deitcher <avi@deitcher.net>

src/cmd/linuxkit/cache/push.go

@@ -17,7 +17,7 @@ import (
 // If remoteName is empty, it is the same as name.
 // If withArchSpecificTags is true, it will push all arch-specific images in the index, each as
 // their own tag with the same name as the index, but with the architecture appended, e.g.
-// image:foo will have image:foo-amd64, image:foo-arm64, etc.
+// image:foo will have image:foo-amd64, image:foo-arm64, image:foo-riscv64, etc.
 func (p *Provider) Push(name, remoteName string, withArchSpecificTags, override bool) error {
 	var (
 		err     error

src/cmd/linuxkit/pkglib/pkglib.go

@@ -60,7 +60,7 @@ type PkglibConfig struct {
 func NewPkgInfo() pkgInfo {
 	return pkgInfo{
 		Org:          "linuxkit",
-		Arches:       []string{"amd64", "arm64"},
+		Arches:       []string{"amd64", "arm64", "riscv64"},
 		Tag:          "{{.Hash}}",
 		GitRepo:      "https://github.com/linuxkit/linuxkit",
 		Network:      false,

src/cmd/linuxkit/run_qemu.go

@@ -70,6 +70,8 @@ func init() {
 		defaultArch = "x86_64"
 	case "s390x":
 		defaultArch = "s390x"
+	case "riscv64":
+		defaultArch = "riscv64"
 	}
 	switch {
 	case runtime.GOARCH == "s390x":
@@ -475,6 +477,8 @@ func buildQemuCmdline(config QemuConfig) (QemuConfig, []string) {
 		goArch = "arm64"
 	case "x86_64":
 		goArch = "amd64"
+	case "riscv64":
+		goArch = "riscv64"
 	default:
 		log.Fatalf("%s is an unsupported architecture.", config.Arch)
 	}

src/cmd/linuxkit/util/arch.go

@@ -20,6 +20,8 @@ func GoArch(in string) (string, error) {
 		return "amd64", nil
 	case "aarch64", "arm64":
 		return "arm64", nil
+	case "riscv64":
+		return "riscv64", nil
 	}
 	return "", fmt.Errorf("unknown arch %q", in)
 }