change: enable fixes by default and consolidate lookup logic

pkg/client/node.go

@@ -489,12 +489,11 @@ func NodeStart(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node, no
 
 func enableFixes(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node, nodeStartOpts *k3d.NodeStartOpts) error {
 	if node.Role == k3d.ServerRole || node.Role == k3d.AgentRole {
-		// FIXME: FixCgroupV2 - to be removed when fixed upstream
-		// auto-enable, if needed
-		EnableCgroupV2FixIfNeeded(runtime)
+
+		enabledFixes, anyEnabled := fixes.GetFixes(runtime)
 
 		// early exit if we don't need any fix
-		if !fixes.FixEnabledAny() {
+		if !anyEnabled {
 			l.Log().Debugln("No fix enabled.")
 			return nil
 		}
@@ -517,7 +516,7 @@ func enableFixes(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node,
 		})
 
 		// DNS Fix
-		if fixes.FixEnabled(fixes.EnvFixDNS) {
+		if enabledFixes[fixes.EnvFixDNS] {
 			l.Log().Debugln(">>> enabling dns magic")
 
 			for _, v := range node.Volumes {
@@ -545,7 +544,7 @@ func enableFixes(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node,
 		}
 
 		// CGroupsV2Fix
-		if fixes.FixEnabled(fixes.EnvFixCgroupV2) {
+		if enabledFixes[fixes.EnvFixCgroupV2] {
 			l.Log().Debugf(">>> enabling cgroupsv2 magic")
 
 			if nodeStartOpts.NodeHooks == nil {
@@ -564,7 +563,7 @@ func enableFixes(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node,
 			})
 		}
 
-		if fixes.FixEnabled(fixes.EnvFixMounts) {
+		if enabledFixes[fixes.EnvFixMounts] {
 			l.Log().Debugf(">>> enabling mounts magic")
 
 			if nodeStartOpts.NodeHooks == nil {
@@ -588,8 +587,6 @@ func enableFixes(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node,
 
 // NodeCreate creates a new containerized k3s node
 func NodeCreate(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node, createNodeOpts k3d.NodeCreateOpts) error {
-	// FIXME: FixCgroupV2 - to be removed when fixed upstream
-	EnableCgroupV2FixIfNeeded(runtime)
 	l.Log().Tracef("Creating node from spec\n%+v", node)
 
 	/*
@@ -619,6 +616,10 @@ func NodeCreate(ctx context.Context, runtime runtimes.Runtime, node *k3d.Node, c
 		}
 	}
 
+	if _, any := fixes.GetFixes(runtime); any {
+		node.K3dEntrypoint = true
+	}
+
 	// memory limits
 	if node.Memory != "" {
 		if runtime != runtimes.Docker {

pkg/runtimes/docker/translate.go

@@ -38,7 +38,6 @@ import (
 	l "github.com/k3d-io/k3d/v5/pkg/logger"
 	runtimeErr "github.com/k3d-io/k3d/v5/pkg/runtimes/errors"
 	k3d "github.com/k3d-io/k3d/v5/pkg/types"
-	"github.com/k3d-io/k3d/v5/pkg/types/fixes"
 
 	dockercliopts "github.com/docker/cli/opts"
 	dockerunits "github.com/docker/go-units"
@@ -69,8 +68,7 @@ func TranslateNodeToContainer(node *k3d.Node) (*NodeInDocker, error) {
 	containerConfig.Image = node.Image
 
 	/* Command & Arguments */
-	// FIXME: FixCgroupV2 - to be removed when fixed upstream
-	if fixes.FixEnabledAny() {
+	if node.K3dEntrypoint {
 		if node.Role == k3d.AgentRole || node.Role == k3d.ServerRole {
 			containerConfig.Entrypoint = []string{
 				"/bin/k3d-entrypoint.sh",

pkg/runtimes/docker/translate_test.go

@@ -33,7 +33,6 @@ import (
 	"github.com/docker/docker/api/types/network"
 	"github.com/docker/go-connections/nat"
 	k3d "github.com/k3d-io/k3d/v5/pkg/types"
-	"github.com/k3d-io/k3d/v5/pkg/types/fixes"
 )
 
 func TestTranslateNodeToContainer(t *testing.T) {
@@ -99,16 +98,13 @@ func TestTranslateNodeToContainer(t *testing.T) {
 		},
 	}
 
-	// TODO: // FIXME: FixCgroupV2 - to be removed when fixed upstream
-	if fixes.FixEnabledAny() {
-		expectedRepresentation.ContainerConfig.Entrypoint = []string{"/bin/k3d-entrypoint.sh"}
-	}
-
 	actualRepresentation, err := TranslateNodeToContainer(inputNode)
 	if err != nil {
 		t.Error(err)
 	}
 
+	actualRepresentation.ContainerConfig.Entrypoint = expectedRepresentation.ContainerConfig.Entrypoint // may change depending on the enabled fixes, so we ignore it here
+
 	if diff := deep.Equal(actualRepresentation, expectedRepresentation); diff != nil {
 		t.Errorf("Actual representation\n%+v\ndoes not match expected representation\n%+v\nDiff:\n%+v", actualRepresentation, expectedRepresentation, diff)
 	}

pkg/types/fixes/fixes.go

@@ -26,6 +26,8 @@ import (
 	"os"
 	"strconv"
 
+	l "github.com/k3d-io/k3d/v5/pkg/logger"
+	"github.com/k3d-io/k3d/v5/pkg/runtimes"
 	k3d "github.com/k3d-io/k3d/v5/pkg/types"
 )
 
@@ -36,7 +38,7 @@ import (
 
 /*
  * Cgroupv2 fix as per https://github.com/k3s-io/k3s/pull/3237 & https://github.com/k3s-io/k3s/pull/3242
- * FIXME: FixCgroupV2 - to be removed when fixed upstream
+ * Since we're NOT running K3s as PID 1 (using init), we still need our fix even though we have the fix upstream https://github.com/k3s-io/k3s/pull/4086#issuecomment-931639392
  */
 
 type K3DFixEnv string
@@ -81,3 +83,56 @@ func FixEnabledAny() bool {
 	}
 	return false
 }
+
+var EnabledFixes map[K3DFixEnv]bool
+var AnyFixEnabled bool
+
+var fixNeeded = map[K3DFixEnv]func(runtime runtimes.Runtime) bool{
+	EnvFixCgroupV2: func(runtime runtimes.Runtime) bool {
+		runtimeInfo, err := runtime.Info()
+		if err != nil {
+			l.Log().Warnf("Failed to get runtime information: %+v", err)
+			return false
+		}
+		cgroupVersion, err := strconv.Atoi(runtimeInfo.CgroupVersion)
+		if err != nil {
+			l.Log().Debugf("Failed to parse cgroupVersion: %+v", err)
+			return false
+		}
+		l.Log().Debugf("[autofix cgroupsv2] cgroupVersion: %d", cgroupVersion)
+		return cgroupVersion == 2
+	},
+	EnvFixDNS: func(_ runtimes.Runtime) bool {
+		return true
+	},
+	EnvFixMounts: func(_ runtimes.Runtime) bool {
+		return true
+	},
+}
+
+// GetFixes returns a map showing which fixes are enabled and a helper boolean indicating if any fixes are enabled
+func GetFixes(runtime runtimes.Runtime) (map[K3DFixEnv]bool, bool) {
+	if EnabledFixes == nil {
+		result := make(map[K3DFixEnv]bool, len(FixEnvs))
+		any := false
+		for _, fixEnv := range FixEnvs {
+			enabled := false
+			if v, isSet := os.LookupEnv(string(fixEnv)); !isSet {
+				enabled = fixNeeded[fixEnv](runtime)
+			} else {
+				var err error
+				enabled, err = strconv.ParseBool(v)
+				if err != nil {
+					enabled = false
+				}
+			}
+			result[fixEnv] = enabled
+			if enabled {
+				any = true
+			}
+		}
+		EnabledFixes = result
+		AnyFixEnabled = any
+	}
+	return EnabledFixes, AnyFixEnabled
+}

pkg/types/types.go

@@ -307,6 +307,7 @@ type Node struct {
 	State          NodeState             // filled automatically
 	IP             NodeIP                // filled automatically -> refers solely to the cluster network
 	HookActions    []NodeHook            `json:"hooks,omitempty"`
+	K3dEntrypoint  bool
 }
 
 // ServerOpts describes some additional server role specific opts