mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
/**
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# Copyright (c) NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package containerd
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import (
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"fmt"
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"os"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/config/engine"
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"github.com/pelletier/go-toml"
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log "github.com/sirupsen/logrus"
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)
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const (
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defaultRuntimeType = "io.containerd.runc.v2"
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)
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type builder struct {
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path string
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runtimeType string
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useLegacyConfig bool
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}
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// Option defines a function that can be used to configure the config builder
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type Option func(*builder)
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// WithPath sets the path for the config builder
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func WithPath(path string) Option {
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return func(b *builder) {
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b.path = path
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}
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}
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// WithRuntimeType sets the runtime type for the config builder
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func WithRuntimeType(runtimeType string) Option {
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return func(b *builder) {
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b.runtimeType = runtimeType
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}
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}
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// WithUseLegacyConfig sets the useLegacyConfig flag for the config builder
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func WithUseLegacyConfig(useLegacyConfig bool) Option {
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return func(b *builder) {
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b.useLegacyConfig = useLegacyConfig
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}
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}
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func (b *builder) build() (engine.Interface, error) {
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if b.path == "" {
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return nil, fmt.Errorf("config path is empty")
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}
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if b.runtimeType == "" {
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b.runtimeType = defaultRuntimeType
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}
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config, err := loadConfig(b.path)
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if err != nil {
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return nil, fmt.Errorf("failed to load config: %v", err)
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}
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config.RuntimeType = b.runtimeType
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config.UseDefaultRuntimeName = !b.useLegacyConfig
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version, err := config.parseVersion(b.useLegacyConfig)
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if err != nil {
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return nil, fmt.Errorf("failed to parse config version: %v", err)
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}
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switch version {
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case 1:
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return (*ConfigV1)(config), nil
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case 2:
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return config, nil
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}
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return nil, fmt.Errorf("unsupported config version: %v", version)
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}
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// loadConfig loads the containerd config from disk
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func loadConfig(config string) (*Config, error) {
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log.Infof("Loading config: %v", config)
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info, err := os.Stat(config)
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if os.IsExist(err) && info.IsDir() {
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return nil, fmt.Errorf("config file is a directory")
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}
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configFile := config
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if os.IsNotExist(err) {
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configFile = "/dev/null"
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log.Infof("Config file does not exist, creating new one")
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}
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tomlConfig, err := toml.LoadFile(configFile)
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if err != nil {
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return nil, err
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}
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log.Infof("Successfully loaded config")
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cfg := Config{
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Tree: tomlConfig,
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}
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return &cfg, nil
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}
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// parseVersion returns the version of the config
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func (c *Config) parseVersion(useLegacyConfig bool) (int, error) {
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defaultVersion := 2
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if useLegacyConfig {
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defaultVersion = 1
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}
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switch v := c.Get("version").(type) {
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case nil:
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switch len(c.Keys()) {
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case 0: // No config exists, or the config file is empty, use version inferred from containerd
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return defaultVersion, nil
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default: // A config file exists, has content, and no version is set
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return 1, nil
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}
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case int64:
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return int(v), nil
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default:
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return -1, fmt.Errorf("unsupported type for version field: %v", v)
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}
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}
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