Automatically set kubernetes config for btrfs storage driver

cmd/minikube/cmd/start_flags.go

@@ -518,6 +518,17 @@ func generateNewConfigFromFlags(cmd *cobra.Command, k8sVersion string, drvName s
 		}
 	}
 
+	if driver.IsDockerBTRFS(drvName) {
+		fg := "LocalStorageCapacityIsolation=false"
+		if !strings.Contains(cc.KubernetesConfig.FeatureGates, fg) {
+			klog.Info("auto-setting LocalStorageCapacityIsolation to false")
+			if len(cc.KubernetesConfig.FeatureGates) != 0 {
+				fg = "," + fg
+			}
+			cc.KubernetesConfig.FeatureGates += fg
+		}
+	}
+
 	return cc
 }
 

pkg/minikube/driver/driver.go

@@ -19,6 +19,7 @@ package driver
 import (
 	"fmt"
 	"os"
+	"os/exec"
 	"runtime"
 	"sort"
 	"strconv"
@@ -144,6 +145,24 @@ func IsDockerDesktop(name string) bool {
 	return false
 }
 
+// IsDockerBTRFS checks if Docker is using btrfs storage driver
+func IsDockerBTRFS(name string) bool {
+	if !IsDocker(name) {
+		return false
+	}
+	cmd := exec.Command("docker", "info", "-f", "{{.Driver}}")
+	if err := cmd.Run(); err != nil {
+		klog.Warning("failed to get Docker storage driver: %v", err)
+		return false
+	}
+	output, err := cmd.Output()
+	if err != nil {
+		klog.Warning("failed to get command output: %v", err)
+		return false
+	}
+	return strings.Contains(string(output), "btrfs")
+}
+
 // IsMock checks if the driver is a mock
 func IsMock(name string) bool {
 	return name == Mock

pkg/minikube/reason/known_issues.go

@@ -1053,6 +1053,15 @@ var guestIssues = []match{
 		},
 		Regexp: re(`'/var/lib/dpkg': No such file or directory`),
 	},
+	{
+		Kind: Kind{
+			ID:       "GUEST_STORAGE_DRIVER_BTRFS",
+			ExitCode: ExGuestUnsupported,
+			Advice:   "minikube does not support the BTRFS storage driver yet, there is a workaround, add the following flag to your start command `--feature-gates=\"LocalStorageCapacityIsolation=false\"`",
+			Issues:   []int{7923},
+		},
+		Regexp: re(`unsupported graph driver: btrfs`),
+	},
 	{
 		Kind: Kind{
 			ID:       "GUEST_INCORRECT_ARCH",