distribution: use the maximum compatible platform by default

When no specific platform is set, pull the platform that
most matches the current host.

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

daemon/create.go

@@ -22,6 +22,7 @@ import (
 	"github.com/opencontainers/selinux/go-selinux"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	archvariant "github.com/tonistiigi/go-archvariant"
 )
 
 type createOpts struct {
@@ -68,7 +69,7 @@ func (daemon *Daemon) containerCreate(opts createOpts) (containertypes.Container
 
 	if opts.params.Platform == nil && opts.params.Config.Image != "" {
 		if img, _ := daemon.imageService.GetImage(opts.params.Config.Image, opts.params.Platform); img != nil {
-			p := platforms.DefaultSpec()
+			p := maximumSpec()
 			imgPlat := v1.Platform{
 				OS:           img.OS,
 				Architecture: img.Architecture,
@@ -319,3 +320,12 @@ func verifyNetworkingConfig(nwConfig *networktypes.NetworkingConfig) error {
 	}
 	return nil
 }
+
+// maximumSpec returns the distribution platform with maximum compatibility for the current node.
+func maximumSpec() v1.Platform {
+	p := platforms.DefaultSpec()
+	if p.Architecture == "amd64" {
+		p.Variant = archvariant.AMD64Variant()
+	}
+	return p
+}

distribution/pull_v2.go

@@ -33,6 +33,7 @@ import (
 	specs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	archvariant "github.com/tonistiigi/go-archvariant"
 )
 
 var (
@@ -1027,3 +1028,12 @@ func toOCIPlatform(p manifestlist.PlatformSpec) specs.Platform {
 		OSVersion:    p.OSVersion,
 	}
 }
+
+// maximumSpec returns the distribution platform with maximum compatibility for the current node.
+func maximumSpec() specs.Platform {
+	p := platforms.DefaultSpec()
+	if p.Architecture == "amd64" {
+		p.Variant = archvariant.AMD64Variant()
+	}
+	return p
+}

distribution/pull_v2_unix.go

@@ -54,7 +54,7 @@ func checkImageCompatibility(imageOS, imageOSVersion string) error {
 }
 
 func withDefault(p specs.Platform) specs.Platform {
-	def := platforms.DefaultSpec()
+	def := maximumSpec()
 	if p.OS == "" {
 		p.OS = def.OS
 	}

vendor.mod

@@ -74,6 +74,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/tchap/go-patricia v2.3.0+incompatible
 	github.com/tonistiigi/fsutil v0.0.0-20220115021204-b19f7f9cb274
+	github.com/tonistiigi/go-archvariant v1.0.0
 	github.com/vbatts/tar-split v0.11.2
 	github.com/vishvananda/netlink v1.1.1-0.20210330154013-f5de75959ad5
 	github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f
@@ -137,7 +138,6 @@ require (
 	github.com/rexray/gocsi v1.2.2 // indirect
 	github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529 // indirect
 	github.com/tinylib/msgp v1.1.0 // indirect
-	github.com/tonistiigi/go-archvariant v1.0.0 // indirect
 	github.com/tonistiigi/units v0.0.0-20180711220420-6950e57a87ea // indirect
 	github.com/vmihailenco/msgpack v4.0.4+incompatible // indirect
 	go.etcd.io/etcd/client/pkg/v3 v3.5.2 // indirect