Remove unneeded legacy discovery

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

internal/discover/legacy.go

@@ -1,70 +0,0 @@
-/**
-# Copyright (c) 2022, 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 discover
-
-import (
-	"path/filepath"
-
-	"github.com/NVIDIA/nvidia-container-toolkit/internal/config"
-	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
-	"github.com/container-orchestrated-devices/container-device-interface/pkg/cdi"
-	"github.com/sirupsen/logrus"
-)
-
-// NewLegacyDiscoverer creates a discoverer for the experimental runtime
-func NewLegacyDiscoverer(logger *logrus.Logger, cfg *Config) (Discover, error) {
-	d := legacy{
-		logger: logger,
-		lookup: lookup.NewExecutableLocator(logger, cfg.Root),
-	}
-
-	return &d, nil
-}
-
-type legacy struct {
-	None
-	logger *logrus.Logger
-	lookup lookup.Locator
-}
-
-var _ Discover = (*legacy)(nil)
-
-// Hooks returns the "legacy" NVIDIA Container Runtime hook. This hook calls out
-// to the nvidia-container-cli to make modifications to the container as defined
-// in libnvidia-container.
-func (d legacy) Hooks() ([]Hook, error) {
-	hookPath := filepath.Join(config.DefaultExecutableDir, config.NVIDIAContainerRuntimeHookExecutable)
-	targets, err := d.lookup.Locate(config.NVIDIAContainerRuntimeHookExecutable)
-	if err != nil {
-		d.logger.Warnf("Failed to locate %v: %v", config.NVIDIAContainerRuntimeHookExecutable, err)
-	} else if len(targets) == 0 {
-		d.logger.Warnf("%v not found", config.NVIDIAContainerRuntimeHookExecutable)
-	} else {
-		d.logger.Debugf("Found %v candidates: %v", config.NVIDIAContainerRuntimeHookExecutable, targets)
-		hookPath = targets[0]
-	}
-	d.logger.Debugf("Using NVIDIA Container Runtime Hook path %v", hookPath)
-
-	args := []string{hookPath, "--force", "prestart"}
-	h := Hook{
-		Lifecycle: cdi.PrestartHook,
-		Path:      hookPath,
-		Args:      args,
-	}
-
-	return []Hook{h}, nil
-}