Initial upgrade flow for control-plane

clitools/pkg/node/uboot/ab.go

@@ -2,9 +2,14 @@ package uboot
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"os"
+	"path/filepath"
+	"strings"
 
+	monov1alpha1 "example.com/monok8s/pkg/apis/monok8s/v1alpha1"
+	"example.com/monok8s/pkg/controller/osimage"
 	"example.com/monok8s/pkg/node"
 )
 
@@ -15,13 +20,67 @@ func ConfigureABBoot(ctx context.Context, nctx *node.NodeContext) error {
 		return fmt.Errorf("get current executable path: %w", err)
 	}
 
+	doWrite := false
 	writer := NewFWEnvWriter(HostFWEnvCfgPath, exePath)
 
-	// TODO: configurable from cluster.env
-	return writer.EnsureBootEnv(ctx, BootEnvConfig{
-		BootSource: "usb",
-		BootPart:   "A",
-	})
+	bootPart, err := writer.GetEnv(ctx, "boot_part")
+	if err != nil {
+		if errors.Is(err, ErrEnvNotFound) {
+
+			state, err := osimage.ReadBootState()
+			if err != nil {
+				return fmt.Errorf("read boot state: %w", err)
+			}
+
+			bootPart := state["BOOT_PART"]
+			if bootPart == "" {
+				return fmt.Errorf("BOOT_PART missing")
+			}
+
+			doWrite = true
+		} else {
+			return fmt.Errorf("get boot_part: %w", err)
+		}
+	}
+
+	bootSource, err := writer.GetEnv(ctx, "boot_source")
+	if err != nil {
+		if errors.Is(err, ErrEnvNotFound) {
+			target, err := os.Readlink(monov1alpha1.AltPartDeviceLink)
+			if err != nil {
+				return fmt.Errorf("readlink %q: %w", monov1alpha1.AltPartDeviceLink, err)
+			}
+
+			if !filepath.IsAbs(target) {
+				target = filepath.Join(filepath.Dir(monov1alpha1.AltPartDeviceLink), target)
+			}
+
+			resolved, err := filepath.EvalSymlinks(target)
+			if err != nil {
+				return fmt.Errorf("resolve %q: %w", target, err)
+			}
+
+			base := filepath.Base(resolved)
+
+			if strings.HasPrefix(base, "mmcblk") {
+				bootSource = "emmc"
+			} else {
+				bootSource = "usb"
+			}
+			doWrite = true
+		} else {
+			return fmt.Errorf("get boot_source: %w", err)
+		}
+	}
+
+	if doWrite {
+		return writer.EnsureBootEnv(ctx, BootEnvConfig{
+			BootSource: bootSource,
+			BootPart:   bootPart,
+		})
+	}
+
+	return nil
 }
 
 // This is called by the agent controller/osupgrade/handler.go