nvidia-container-toolkit/internal/config/cli.go

/**
# 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 config

import (
	"os"
	"strings"
)

// ContainerCLIConfig stores the options for the nvidia-container-cli
type ContainerCLIConfig struct {
	Root        string   `toml:"root"`
	Path        string   `toml:"path"`
	Environment []string `toml:"environment"`
	Debug       string   `toml:"debug"`
	Ldcache     string   `toml:"ldcache"`
	LoadKmods   bool     `toml:"load-kmods"`
	// NoPivot disables the pivot root operation in the NVIDIA Container CLI.
	// This is not exposed in the config if not set.
	NoPivot   bool   `toml:"no-pivot,omitempty"`
	NoCgroups bool   `toml:"no-cgroups"`
	User      string `toml:"user"`
	Ldconfig  string `toml:"ldconfig"`
}

// NormalizeLDConfigPath returns the resolved path of the configured LDConfig binary.
// This is only done for host LDConfigs and is required to handle systems where
// /sbin/ldconfig is a wrapper around /sbin/ldconfig.real.
func (c *ContainerCLIConfig) NormalizeLDConfigPath() string {
	return NormalizeLDConfigPath(c.Ldconfig)
}

// NormalizeLDConfigPath returns the resolved path of the configured LDConfig binary.
// This is only done for host LDConfigs and is required to handle systems where
// /sbin/ldconfig is a wrapper around /sbin/ldconfig.real.
func NormalizeLDConfigPath(path string) string {
	if !strings.HasPrefix(path, "@") {
		return path
	}

	trimmedPath := strings.TrimSuffix(strings.TrimPrefix(path, "@"), ".real")
	// If the .real path exists, we return that.
	if _, err := os.Stat(trimmedPath + ".real"); err == nil {
		return "@" + trimmedPath + ".real"
	}
	// If the .real path does not exists (or cannot be read) we return the non-.real path.
	return "@" + trimmedPath
}