Fix raspberry pi zero cpu variant recognition

Signed-off-by: Łukasz Stolcman <[email protected]>

internal/pkg/platform/platform_matcher.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/containers/image/v5/types"
 	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/sirupsen/logrus"
 	"golang.org/x/exp/slices"
 )
 
@@ -82,9 +83,25 @@ func getCPUVariantWindows(arch string) string {
 func getCPUVariantArm() string {
 	variant, err := getCPUInfo("Cpu architecture")
 	if err != nil {
+		logrus.Errorf("Couldn't get cpu architecture")
 		return ""
 	}
-	// TODO handle RPi Zero mismatch (https://github.com/moby/moby/pull/36121#issuecomment-398328286)
+
+	// handle RPi Zero variant mismatch due to wrong variant from kernel
+	// https://github.com/containerd/containerd/pull/4530
+	// https://www.raspberrypi.org/forums/viewtopic.php?t=12614
+	// https://github.com/moby/moby/pull/36121#issuecomment-398328286
+	if runtime.GOARCH == "arm" && variant == "7" {
+		model, err := getCPUInfo("model name")
+		if err != nil {
+			logrus.Errorf("Couldn't get cpu model name, it may be the corner case where variant is 6")
+			return ""
+		}
+		if strings.HasPrefix(strings.ToLower(model), "armv6-compatible") {
+			logrus.Debugf("Detected corner case, setting cpu variant to 6")
+			variant = "6"
+		}
+	}
 
 	switch strings.ToLower(variant) {
 	case "8", "aarch64":