new(cmd,pkg,internal): implemented new driver command.

It exposes 4 subcmds:
* `install` to install (ie: either download or build) kmod or eBPF probe
* `cleanup` to cleanup a driver
* `printenv` to print environment variables about driver-loader
* `config` to configure the driver-loader feature

Signed-off-by: Federico Di Pierro <nierro92@gmail.com>

cmd/artifact/install/install.go

@@ -327,7 +327,7 @@ func (o *artifactInstallOptions) RunArtifactInstall(ctx context.Context, args []
 			return err
 		}
 		// Extract artifact and move it to its destination directory
-		_, err = utils.ExtractTarGz(f, destDir)
+		_, err = utils.ExtractTarGz(f, destDir, 0)
 		if err != nil {
 			return fmt.Errorf("cannot extract %q to %q: %w", result.Filename, destDir, err)
 		}

cmd/driver/cleanup/cleanup.go

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2023 The Falco Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package drivercleanup
+
+import (
+	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
+
+	"github.com/falcosecurity/falcoctl/internal/config"
+	"github.com/falcosecurity/falcoctl/pkg/options"
+)
+
+type driverCleanupOptions struct {
+	*options.Common
+}
+
+// NewDriverCleanupCmd cleans a driver up.
+func NewDriverCleanupCmd(ctx context.Context, opt *options.Common) *cobra.Command {
+	o := driverCleanupOptions{
+		Common: opt,
+	}
+
+	cmd := &cobra.Command{
+		Use:                   "cleanup [flags]",
+		DisableFlagsInUseLine: true,
+		Short:                 "Cleanup a driver",
+		Long:                  "Cleans a driver up, eg for kmod, by removing it from dkms.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return o.RunDriverCleanup(ctx)
+		},
+	}
+	return cmd
+}
+
+func (o *driverCleanupOptions) RunDriverCleanup(_ context.Context) error {
+	driver, err := config.Driverer()
+	if err != nil {
+		return err
+	}
+	o.Printer.Logger.Info("Running falcoctl driver cleanup", o.Printer.Logger.Args(
+		"driver type", driver.Type,
+		"driver name", driver.Name))
+	return driver.Type.Cleanup(o.Printer, driver.Name)
+}

cmd/driver/cleanup/doc.go

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2023 The Falco Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package drivercleanup defines the cleanup logic for the driver cmd.
+package drivercleanup

cmd/driver/config/config.go

@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2023 The Falco Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package driverconfig
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/pterm/pterm"
+	"github.com/spf13/cobra"
+	"golang.org/x/net/context"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+
+	"github.com/falcosecurity/falcoctl/internal/config"
+	"github.com/falcosecurity/falcoctl/internal/utils"
+	driverdistro "github.com/falcosecurity/falcoctl/pkg/driver/distro"
+	driverkernel "github.com/falcosecurity/falcoctl/pkg/driver/kernel"
+	drivertype "github.com/falcosecurity/falcoctl/pkg/driver/type"
+	"github.com/falcosecurity/falcoctl/pkg/options"
+)
+
+const (
+	configMapDriverTypeKey = "driver_mode"
+)
+
+type driverConfigOptions struct {
+	*options.Common
+	Type       *options.DriverTypes
+	Version    string
+	Repos      []string
+	Name       string
+	HostRoot   string
+	Update     bool
+	Namespace  string
+	KubeConfig string
+}
+
+// NewDriverConfigCmd configures a driver and stores it in config.
+func NewDriverConfigCmd(ctx context.Context, opt *options.Common) *cobra.Command {
+	o := driverConfigOptions{
+		Common: opt,
+		Type:   options.NewDriverTypes(),
+	}
+
+	cmd := &cobra.Command{
+		Use:                   "config [flags]",
+		DisableFlagsInUseLine: true,
+		Short:                 "Configure a driver",
+		Long:                  "Configure a driver for future usages with other driver subcommands",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return o.RunDriverConfig(ctx, cmd)
+		},
+	}
+
+	cmd.Flags().Var(o.Type, "type", "Driver type to be configured "+o.Type.Allowed())
+	cmd.Flags().StringVar(&o.Version, "version", config.DefaultDriver.Version, "Driver version to be configured.")
+	cmd.Flags().StringSliceVar(&o.Repos, "repo", config.DefaultDriver.Repos, "Driver repo to be configured.")
+	cmd.Flags().StringVar(&o.Name, "name", config.DefaultDriver.Name, "Driver name to be configured.")
+	cmd.Flags().StringVar(&o.HostRoot, "host-root", config.DefaultDriver.HostRoot, "Driver host root to be configured.")
+	cmd.Flags().BoolVar(&o.Update, "update-falco", true, "Whether to update Falco config/configmap.")
+	cmd.Flags().StringVar(&o.Namespace, "namespace", "", "Kubernetes namespace.")
+	cmd.Flags().StringVar(&o.KubeConfig, "kubeconfig", "", "Kubernetes config.")
+	return cmd
+}
+
+// RunDriverConfig implements the driver configuration command.
+func (o *driverConfigOptions) RunDriverConfig(ctx context.Context, cmd *cobra.Command) error {
+	var (
+		dType drivertype.DriverType
+		err   error
+	)
+
+	driverCfg, err := config.Driverer()
+	if err != nil {
+		return err
+	}
+
+	loggerArgs := make([]pterm.LoggerArgument, 0)
+	if f := cmd.Flags().Lookup("version"); f != nil && f.Changed {
+		driverCfg.Version = o.Version
+		loggerArgs = append(loggerArgs, pterm.LoggerArgument{
+			Key:   "driver version",
+			Value: o.Version,
+		})
+	}
+	if f := cmd.Flags().Lookup("repo"); f != nil && f.Changed {
+		driverCfg.Repos = o.Repos
+		loggerArgs = append(loggerArgs, pterm.LoggerArgument{
+			Key:   "driver repos",
+			Value: strings.Join(o.Repos, ","),
+		})
+	}
+	if f := cmd.Flags().Lookup("name"); f != nil && f.Changed {
+		driverCfg.Name = o.Name
+		loggerArgs = append(loggerArgs, pterm.LoggerArgument{
+			Key:   "driver name",
+			Value: o.Name,
+		})
+	}
+	if f := cmd.Flags().Lookup("host-root"); f != nil && f.Changed {
+		driverCfg.HostRoot = o.HostRoot
+		loggerArgs = append(loggerArgs, pterm.LoggerArgument{
+			Key:   "driver host root",
+			Value: o.HostRoot,
+		})
+	}
+	if f := cmd.Flags().Lookup("type"); f != nil && f.Changed {
+		loggerArgs = append(loggerArgs, pterm.LoggerArgument{
+			Key:   "driver type",
+			Value: o.Type.String(),
+		})
+		if o.Type.String() != "auto" {
+			// Ok driver type was enforced by the user
+			dType, err = drivertype.Parse(o.Type.String())
+			if err != nil {
+				return err
+			}
+		} else {
+			// automatic logic
+			info, err := driverkernel.FetchInfo("", "")
+			if err != nil {
+				return err
+			}
+			o.Printer.Logger.Debug("Fetched kernel info", o.Printer.Logger.Args(
+				"arch", info.Architecture.ToNonDeb(),
+				"kernel release", info.String(),
+				"kernel version", info.KernelVersion))
+
+			d, err := driverdistro.DiscoverDistro(info, driverCfg.HostRoot)
+			if err != nil {
+				return err
+			}
+			o.Printer.Logger.Debug("Discovered distro", o.Printer.Logger.Args("target", d))
+
+			dType = d.PreferredDriver(info)
+			if dType == nil {
+				return fmt.Errorf("automatic driver selection failed")
+			}
+		}
+		driverCfg.Type = dType
+	}
+
+	o.Printer.Logger.Info("Running falcoctl driver config", loggerArgs)
+
+	if o.Update {
+		err = commit(ctx, dType, driverCfg.HostRoot, o.Namespace, o.KubeConfig)
+		if err != nil {
+			return err
+		}
+	}
+	return config.StoreDriver(&driverCfg, o.ConfigFile)
+}
+
+func replaceDriverTypeInFalcoConfig(hostRoot string, driverType drivertype.DriverType) error {
+	return utils.ReplaceLineInFile(hostRoot+"/etc/falco/falco.yaml", "driver_mode:", "driver_mode: "+driverType.String(), 1)
+}
+
+func replaceDriverTypeInK8SConfigMap(ctx context.Context, namespace, kubeconfig string, driverType drivertype.DriverType) error {
+	var (
+		err error
+		cfg *rest.Config
+	)
+
+	if kubeconfig != "" {
+		cfg, err = clientcmd.BuildConfigFromFlags("", kubeconfig)
+	} else {
+		cfg, err = rest.InClusterConfig()
+	}
+	if err != nil {
+		return err
+	}
+
+	cl, err := kubernetes.NewForConfig(cfg)
+	if err != nil {
+		return err
+	}
+
+	configMapList, err := cl.CoreV1().ConfigMaps(namespace).List(ctx, metav1.ListOptions{
+		LabelSelector: "app.kubernetes.io/instance: falco",
+	})
+	if err != nil {
+		return err
+	}
+	if configMapList.Size() == 0 {
+		return fmt.Errorf(`no configmaps matching "app.kubernetes.io/instance: falco" label were found`)
+	}
+
+	type patchDriverTypeValue struct {
+		Op    string `json:"op"`
+		Path  string `json:"path"`
+		Value string `json:"value"`
+	}
+	payload := []patchDriverTypeValue{{
+		Op:    "replace",
+		Path:  "/data/" + configMapDriverTypeKey,
+		Value: driverType.String(),
+	}}
+	plBytes, _ := json.Marshal(payload)
+
+	for i := 0; i < configMapList.Size(); i++ {
+		configMap := configMapList.Items[i]
+		// Modify the data in the ConfigMap ONLY if driver_mode is NOT set to plugin
+		// TODO: we must be sure that we are modifying the configmap for a Falco
+		// that is running with drivers, and not plugins.
+		// Scenario: user has multiple Falco pods deployed in its cluster, one running with driver,
+		// other running with plugins. We must only touch the one running with driver.
+		if val, ok := configMap.Data[configMapDriverTypeKey]; !ok || val == "none" {
+			continue
+		}
+
+		// Patch the configMap
+		if _, err = cl.CoreV1().ConfigMaps(configMap.Namespace).Patch(
+			ctx, configMap.Name, types.JSONPatchType, plBytes, metav1.PatchOptions{}); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// commit saves the updated driver type to Falco config,
+// either to the local falco.yaml or updating the deployment configmap.
+func commit(ctx context.Context, driverType drivertype.DriverType, hostroot, namespace, kubeconfig string) error {
+	if namespace != "" {
+		// Ok we are on k8s
+		return replaceDriverTypeInK8SConfigMap(ctx, namespace, kubeconfig, driverType)
+	}
+	return replaceDriverTypeInFalcoConfig(hostroot, driverType)
+}

cmd/driver/config/doc.go

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright (C) 2023 The Falco Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package driverconfig defines the configure logic for the driver cmd.
+package driverconfig