refactor: Derive path of a patch file in a common package

pkg/common/containerd.go

@@ -0,0 +1,36 @@
+// Copyright 2024 Nutanix. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+package common
+
+import "path/filepath"
+
+const (
+	// ConfigDirOnRemote is the directory on the machine where we write CAREN configuration (e.g. scripts, patches
+	// etc) as files.
+	// These files are later applied by one or more commands that run on the machine.
+	ConfigDirOnRemote = "/etc/caren"
+
+	// ContainerdScriptsDirOnRemote is the directory where we write scripts that relate to containerd as files.
+	// It is a subdirectory of the root config directory.
+	ContainerdScriptsDirOnRemote = ConfigDirOnRemote + "/containerd"
+
+	// ContainerdPatchDirOnRemote is the directory where we write containerd configuration patches as files.
+	// It is a subdirectory of the containerd config directory.
+	ContainerdPatchDirOnRemote = ConfigDirOnRemote + "/containerd/patches"
+)
+
+// ConfigFilePathOnRemote returns the absolute path of a file that CAREN deploys onto the machine.
+func ConfigFilePathOnRemote(relativePath string) string {
+	return filepath.Join(ConfigDirOnRemote, relativePath)
+}
+
+// ContainerPathOnRemote returns the absolute path of a script that relates to containerd on the machine.
+func ContainerdScriptPathOnRemote(relativePath string) string {
+	return filepath.Join(ContainerdScriptsDirOnRemote, relativePath)
+}
+
+// ContainerdPatchPathOnRemote returns the absolute path of a containerd configuration patch on the machine.
+func ContainerdPatchPathOnRemote(relativePath string) string {
+	return filepath.Join(ContainerdPatchDirOnRemote, relativePath)
+}

pkg/handlers/generic/mutation/containerdapplypatchesandrestart/apply_patches.go

@@ -9,12 +9,16 @@ import (
 	"text/template"
 
 	bootstrapv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
+
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/common"
 )
 
 const (
-	tomlMergeImage                              = "ghcr.io/mesosphere/toml-merge:v0.2.0"
-	ContainerdPatchesDirOnRemote                = "/etc/caren/containerd/patches"
-	containerdApplyPatchesScriptOnRemote        = "/etc/caren/containerd/apply-patches.sh"
+	tomlMergeImage = "ghcr.io/mesosphere/toml-merge:v0.2.0"
+)
+
+var (
+	containerdApplyPatchesScriptOnRemote        = common.ContainerdScriptPathOnRemote("apply-patches.sh")
 	containerdApplyPatchesScriptOnRemoteCommand = "/bin/bash " + containerdApplyPatchesScriptOnRemote
 )
 
@@ -32,7 +36,7 @@ func generateContainerdApplyPatchesScript() (bootstrapv1.File, string, error) {
 		PatchDir       string
 	}{
 		TOMLMergeImage: tomlMergeImage,
-		PatchDir:       ContainerdPatchesDirOnRemote,
+		PatchDir:       common.ContainerdPatchDirOnRemote,
 	}
 
 	var b bytes.Buffer

pkg/handlers/generic/mutation/containerdapplypatchesandrestart/inject_test.go

@@ -42,7 +42,7 @@ var _ = Describe("Generate Containerd apply patches and restart patches", func()
 							"path", containerdApplyPatchesScriptOnRemote,
 						),
 						gomega.HaveKeyWithValue(
-							"path", ContainerdRestartScriptOnRemote,
+							"path", containerdRestartScriptOnRemote,
 						),
 					),
 				},
@@ -51,7 +51,7 @@ var _ = Describe("Generate Containerd apply patches and restart patches", func()
 					Path:      "/spec/template/spec/kubeadmConfigSpec/preKubeadmCommands",
 					ValueMatcher: gomega.HaveExactElements(
 						containerdApplyPatchesScriptOnRemoteCommand,
-						ContainerdRestartScriptOnRemoteCommand,
+						containerdRestartScriptOnRemoteCommand,
 					),
 				},
 			},
@@ -78,7 +78,7 @@ var _ = Describe("Generate Containerd apply patches and restart patches", func()
 							"path", containerdApplyPatchesScriptOnRemote,
 						),
 						gomega.HaveKeyWithValue(
-							"path", ContainerdRestartScriptOnRemote,
+							"path", containerdRestartScriptOnRemote,
 						),
 					),
 				},
@@ -87,7 +87,7 @@ var _ = Describe("Generate Containerd apply patches and restart patches", func()
 					Path:      "/spec/template/spec/preKubeadmCommands",
 					ValueMatcher: gomega.HaveExactElements(
 						containerdApplyPatchesScriptOnRemoteCommand,
-						ContainerdRestartScriptOnRemoteCommand,
+						containerdRestartScriptOnRemoteCommand,
 					),
 				},
 			},

pkg/handlers/generic/mutation/containerdapplypatchesandrestart/restart.go

@@ -5,12 +5,13 @@ package containerdapplypatchesandrestart
 import (
 	_ "embed"
 
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/common"
 	bootstrapv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
 )
 
-const (
-	ContainerdRestartScriptOnRemote        = "/etc/containerd/restart.sh"
-	ContainerdRestartScriptOnRemoteCommand = "/bin/bash " + ContainerdRestartScriptOnRemote
+var (
+	containerdRestartScriptOnRemote        = common.ContainerdScriptPathOnRemote("restart.sh")
+	containerdRestartScriptOnRemoteCommand = "/bin/bash " + containerdRestartScriptOnRemote
 )
 
 //go:embed templates/containerd-restart.sh
@@ -19,9 +20,9 @@ var containerdRestartScript []byte
 //nolint:gocritic // no need for named return values
 func generateContainerdRestartScript() (bootstrapv1.File, string) {
 	return bootstrapv1.File{
-			Path:        ContainerdRestartScriptOnRemote,
+			Path:        containerdRestartScriptOnRemote,
 			Content:     string(containerdRestartScript),
 			Permissions: "0700",
 		},
-		ContainerdRestartScriptOnRemoteCommand
+		containerdRestartScriptOnRemoteCommand
 }

pkg/handlers/generic/mutation/containerdmetrics/metrics.go

@@ -4,23 +4,16 @@ package containerdmetrics
 
 import (
 	_ "embed"
-	"path"
 
 	cabpkv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
-)
 
-const (
-	// TODO Factor out this constant to a common package.
-	containerdPatchesDirOnRemote = "/etc/caren/containerd"
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/common"
 )
 
 var (
 	//go:embed files/metrics-config.toml
 	metricsConfigDropIn             []byte
-	metricsConfigDropInFileOnRemote = path.Join(
-		containerdPatchesDirOnRemote,
-		"metrics-config.toml",
-	)
+	metricsConfigDropInFileOnRemote = common.ContainerdPatchPathOnRemote("metrics-config.toml")
 )
 
 func generateMetricsConfigDropIn() cabpkv1.File {

pkg/handlers/generic/mutation/imageregistries/credentials/credential_provider_install_files.go

@@ -10,14 +10,18 @@ import (
 	"text/template"
 
 	cabpkv1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
+
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/common"
 )
 
-const (
-	//nolint:gosec // Does not contain hard coded credentials.
-	installKubeletCredentialProvidersScriptOnRemote = "/etc/caren/install-kubelet-credential-providers.sh"
+var (
+	installKubeletCredentialProvidersScriptOnRemote = common.ConfigFilePathOnRemote(
+		"install-kubelet-credential-providers.sh")
 
 	installKubeletCredentialProvidersScriptOnRemoteCommand = "/bin/bash " + installKubeletCredentialProvidersScriptOnRemote
+)
 
+const (
 	//nolint:gosec // Does not contain hard coded credentials.
 	dynamicCredentialProviderImage = "ghcr.io/mesosphere/dynamic-credential-provider:v0.5.0"
 

pkg/handlers/generic/mutation/mirrors/mirror.go

@@ -17,7 +17,7 @@ import (
 	ctrlclient "sigs.k8s.io/controller-runtime/pkg/client"
 
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/api/v1alpha1"
-	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/mutation/containerdapplypatchesandrestart"
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/common"
 )
 
 const (
@@ -36,8 +36,7 @@ var (
 
 	//go:embed templates/containerd-registry-config-drop-in.toml
 	containerdRegistryConfigDropIn             []byte
-	containerdRegistryConfigDropInFileOnRemote = path.Join(
-		containerdapplypatchesandrestart.ContainerdPatchesDirOnRemote,
+	containerdRegistryConfigDropInFileOnRemote = common.ContainerdPatchPathOnRemote(
 		"registry-config.toml",
 	)
 )