mirror of https://github.com/docker/compose.git
102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
/*
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Copyright 2020 Docker Compose CLI authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 config
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import (
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"context"
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"encoding/json"
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"io/ioutil"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"github.com/docker/compose-cli/context/store"
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)
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type dirKey struct{}
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// WithDir sets the config directory path in the context
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func WithDir(ctx context.Context, path string) context.Context {
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return context.WithValue(ctx, dirKey{}, path)
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}
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// Dir returns the config directory path
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func Dir(ctx context.Context) string {
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cd, _ := ctx.Value(dirKey{}).(string)
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return cd
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}
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// LoadFile loads the docker configuration
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func LoadFile(dir string) (*File, error) {
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f := &File{}
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err := loadFile(configFilePath(dir), &f)
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if err != nil {
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return nil, err
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}
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return f, nil
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}
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// WriteCurrentContext writes the selected current context to the Docker
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// configuration file. Note, the validity of the context is not checked.
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func WriteCurrentContext(dir string, name string) error {
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m := map[string]interface{}{}
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path := configFilePath(dir)
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err := loadFile(path, &m)
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if err != nil {
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return err
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}
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// Match existing CLI behavior
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if name == store.DefaultContextName {
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delete(m, currentContextKey)
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} else {
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m[currentContextKey] = name
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}
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return writeFile(path, m)
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}
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func writeFile(path string, content map[string]interface{}) error {
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d, err := json.MarshalIndent(content, "", "\t")
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if err != nil {
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return errors.Wrap(err, "unable to marshal config")
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}
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err = ioutil.WriteFile(path, d, 0644)
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return errors.Wrap(err, "unable to write config file")
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}
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func loadFile(path string, dest interface{}) error {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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if os.IsNotExist(err) {
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// Not an error if there is no config, we're just using defaults
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return nil
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}
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return errors.Wrap(err, "unable to read config file")
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}
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err = json.Unmarshal(data, dest)
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return errors.Wrap(err, "unable to unmarshal config file "+path)
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}
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func configFilePath(dir string) string {
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return filepath.Join(dir, ConfigFileName)
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}
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// File contains the current context from the docker configuration file
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type File struct {
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CurrentContext string `json:"currentContext,omitempty"`
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}
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