mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-23 00:38:26 +00:00
0e6dc3f7ea
In preparation for adding a command to the nvidia-ctk CLI to modify the docker config, this change refactors load, update, and flush logic from the toolkit container docker CLI to an internal package. Signed-off-by: Evan Lezar <elezar@nvidia.com>
116 lines
3.0 KiB
Go
116 lines
3.0 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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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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log "github.com/sirupsen/logrus"
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)
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// LoadConfig loads the docker config from disk
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func LoadConfig(configFilePath string) (map[string]interface{}, error) {
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log.Infof("Loading docker config from %v", configFilePath)
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info, err := os.Stat(configFilePath)
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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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cfg := make(map[string]interface{})
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if os.IsNotExist(err) {
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log.Infof("Config file does not exist, creating new one")
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return cfg, nil
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}
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readBytes, err := ioutil.ReadFile(configFilePath)
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if err != nil {
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return nil, fmt.Errorf("unable to read config: %v", err)
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}
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reader := bytes.NewReader(readBytes)
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if err := json.NewDecoder(reader).Decode(&cfg); 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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return cfg, nil
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}
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// UpdateConfig updates the docker config to include the nvidia runtimes
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func UpdateConfig(config map[string]interface{}, defaultRuntime string, newRuntimes map[string]interface{}) error {
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if defaultRuntime != "" {
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config["default-runtime"] = defaultRuntime
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}
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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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for name, rt := range newRuntimes {
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runtimes[name] = rt
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}
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// Update the runtimes definition
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if len(runtimes) > 0 {
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config["runtimes"] = runtimes
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}
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return nil
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}
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// FlushConfig flushes the updated/reverted config out to disk
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func FlushConfig(cfg map[string]interface{}, configFilePath string) error {
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log.Infof("Flushing docker config to %v", configFilePath)
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output, err := json.MarshalIndent(cfg, "", " ")
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if err != nil {
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return fmt.Errorf("unable to convert to JSON: %v", err)
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}
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switch len(output) {
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case 0:
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err := os.Remove(configFilePath)
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if err != nil {
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return fmt.Errorf("unable to remove empty file: %v", err)
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}
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log.Infof("Config empty, removing file")
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default:
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f, err := os.Create(configFilePath)
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if err != nil {
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return fmt.Errorf("unable to open %v for writing: %v", configFilePath, err)
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}
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defer f.Close()
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_, err = f.WriteString(string(output))
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if err != nil {
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return fmt.Errorf("unable to write output: %v", err)
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}
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}
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log.Infof("Successfully flushed config")
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return nil
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}
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