mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
baf94181aa
This change adds an engine.Config type to encapsulate the writing of config files for container engines. Signed-off-by: Evan Lezar <elezar@nvidia.com>
86 lines
2.0 KiB
Go
86 lines
2.0 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 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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"github.com/NVIDIA/nvidia-container-toolkit/internal/logger"
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)
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type builder struct {
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logger logger.Interface
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path string
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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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// WithLogger sets the logger for the config builder
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func WithLogger(logger logger.Interface) Option {
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return func(b *builder) {
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b.logger = logger
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}
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}
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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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func (b *builder) build() (*Config, error) {
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if b.path == "" {
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empty := make(Config)
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return &empty, nil
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}
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return b.loadConfig(b.path)
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}
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// loadConfig loads the docker config from disk
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func (b *builder) loadConfig(config string) (*Config, error) {
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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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cfg := make(Config)
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if os.IsNotExist(err) {
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b.logger.Infof("Config file does not exist; using empty config")
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return &cfg, nil
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}
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b.logger.Infof("Loading config from %v", config)
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readBytes, err := ioutil.ReadFile(config)
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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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return &cfg, nil
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}
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