mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-26 22:09:35 +00:00
141 lines
3.1 KiB
Go
141 lines
3.1 KiB
Go
/**
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# Copyright (c) 2021-2022, 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 docker
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import (
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"encoding/json"
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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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)
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const (
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defaultDockerRuntime = "runc"
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)
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// Config defines a docker config file.
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// TODO: This should not be public, but we need to access it from the tests in tools/container/docker
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type Config map[string]interface{}
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// New creates a docker config with the specified options
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func New(opts ...Option) (engine.Interface, error) {
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b := &builder{}
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for _, opt := range opts {
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opt(b)
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}
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return b.build()
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}
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// AddRuntime adds a new runtime to the docker config
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func (c *Config) AddRuntime(name string, path string, setAsDefault bool) error {
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if c == nil {
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return fmt.Errorf("config is nil")
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}
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config := *c
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// Read the existing runtimes
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runtimes := make(map[string]interface{})
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if _, exists := config["runtimes"]; exists {
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runtimes = config["runtimes"].(map[string]interface{})
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}
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// Add / update the runtime definitions
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runtimes[name] = map[string]interface{}{
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"path": path,
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"args": []string{},
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}
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config["runtimes"] = runtimes
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if setAsDefault {
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config["default-runtime"] = name
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}
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*c = config
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return nil
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}
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// DefaultRuntime returns the default runtime for the docker config
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func (c Config) DefaultRuntime() string {
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r, ok := c["default-runtime"].(string)
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if !ok {
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return ""
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}
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return r
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}
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// RemoveRuntime removes a runtime from the docker config
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func (c *Config) RemoveRuntime(name string) error {
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if c == nil {
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return nil
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}
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config := *c
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if _, exists := config["default-runtime"]; exists {
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defaultRuntime := config["default-runtime"].(string)
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if defaultRuntime == name {
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config["default-runtime"] = defaultDockerRuntime
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}
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}
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if _, exists := config["runtimes"]; exists {
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runtimes := config["runtimes"].(map[string]interface{})
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delete(runtimes, name)
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if len(runtimes) == 0 {
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delete(config, "runtimes")
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}
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}
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*c = config
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return nil
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}
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// Save writes the config to the specified path
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func (c Config) Save(path string) (int64, error) {
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output, err := json.MarshalIndent(c, "", " ")
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if err != nil {
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return 0, fmt.Errorf("unable to convert to JSON: %v", err)
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}
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if len(output) == 0 {
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err := os.Remove(path)
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if err != nil {
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return 0, fmt.Errorf("unable to remove empty file: %v", err)
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}
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return 0, nil
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}
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f, err := os.Create(path)
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if err != nil {
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return 0, fmt.Errorf("unable to open %v for writing: %v", path, err)
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}
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defer f.Close()
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n, err := f.WriteString(string(output))
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if err != nil {
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return 0, fmt.Errorf("unable to write output: %v", err)
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}
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return int64(n), nil
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}
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