Add nvidia-ctk system create-device-nodes command

This change adds an nvidia-ctk system create-device-nodes command for
creating NVIDIA device nodes. Currently this is limited to control devices
(nvidia-uvm, nvidia-uvm-tools, nvidia-modeset, nvidiactl).

A --dry-run mode is included for outputing commands that would be executed and
the driver root can be specified.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

cmd/nvidia-ctk/system/create-device-nodes/create-device-nodes.go

@@ -0,0 +1,107 @@
+/**
+# Copyright (c) NVIDIA CORPORATION.  All rights reserved.
+#
+# 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 createdevicenodes
+
+import (
+	"fmt"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/system"
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli/v2"
+)
+
+type command struct {
+	logger *logrus.Logger
+}
+
+type options struct {
+	driverRoot string
+
+	dryRun bool
+
+	control bool
+}
+
+// NewCommand constructs a command sub-command with the specified logger
+func NewCommand(logger *logrus.Logger) *cli.Command {
+	c := command{
+		logger: logger,
+	}
+	return c.build()
+}
+
+// build
+func (m command) build() *cli.Command {
+	opts := options{}
+
+	c := cli.Command{
+		Name:  "create-device-nodes",
+		Usage: "A utility to create NVIDIA device ndoes",
+		Before: func(c *cli.Context) error {
+			return m.validateFlags(c, &opts)
+		},
+		Action: func(c *cli.Context) error {
+			return m.run(c, &opts)
+		},
+	}
+
+	c.Flags = []cli.Flag{
+		&cli.StringFlag{
+			Name:        "driver-root",
+			Usage:       "the path to the driver root. Device nodes will be created at `DRIVER_ROOT`/dev",
+			Value:       "/",
+			Destination: &opts.driverRoot,
+			EnvVars:     []string{"DRIVER_ROOT"},
+		},
+		&cli.BoolFlag{
+			Name:        "control-devices",
+			Usage:       "create all control device nodes: nvidiactl, nvidia-modeset, nvidia-uvm, nvidia-uvm-tools",
+			Destination: &opts.control,
+		},
+		&cli.BoolFlag{
+			Name:        "dry-run",
+			Usage:       "if set, the command will not create any symlinks.",
+			Value:       false,
+			Destination: &opts.dryRun,
+			EnvVars:     []string{"DRY_RUN"},
+		},
+	}
+
+	return &c
+}
+
+func (m command) validateFlags(r *cli.Context, opts *options) error {
+	return nil
+}
+
+func (m command) run(c *cli.Context, opts *options) error {
+	s, err := system.New(
+		system.WithLogger(m.logger),
+		system.WithDryRun(opts.dryRun),
+	)
+	if err != nil {
+		return fmt.Errorf("failed to create library: %v", err)
+	}
+
+	if opts.control {
+		m.logger.Infof("Creating control device nodes at %s", opts.driverRoot)
+		if err := s.CreateNVIDIAControlDeviceNodesAt(opts.driverRoot); err != nil {
+			return fmt.Errorf("failed to create control device nodes: %v", err)
+		}
+	}
+	return nil
+}

cmd/nvidia-ctk/system/system.go

@@ -18,6 +18,7 @@ package system
 
 import (
 	devchar "github.com/NVIDIA/nvidia-container-toolkit/cmd/nvidia-ctk/system/create-dev-char-symlinks"
+	devicenodes "github.com/NVIDIA/nvidia-container-toolkit/cmd/nvidia-ctk/system/create-device-nodes"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli/v2"
 )
@@ -43,6 +44,7 @@ func (m command) build() *cli.Command {
 
 	system.Subcommands = []*cli.Command{
 		devchar.NewCommand(m.logger),
+		devicenodes.NewCommand(m.logger),
 	}
 
 	return &system