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package config
import (
"fmt"
"os"
"path/filepath"
"gopkg.in/yaml.v2"
"github.com/canonical/lxd/shared"
)
// LoadConfig reads the configuration from the config path; if the path does
// not exist, it returns a default configuration.
func LoadConfig(path string) (*Config, error) {
// Open the config file
content, err := os.ReadFile(path)
if err != nil {
return nil, fmt.Errorf("Unable to read the configuration file: %w", err)
}
// Decode the YAML document
c := NewConfig(filepath.Dir(path), false)
err = yaml.Unmarshal(content, &c)
if err != nil {
return nil, fmt.Errorf("Unable to decode the configuration: %w", err)
}
for k, r := range c.Remotes {
if !r.Public && r.AuthType == "" {
r.AuthType = "tls"
c.Remotes[k] = r
}
}
// Apply the global (system-wide) remotes
globalConf := NewConfig("", false)
content, err = os.ReadFile(globalConf.GlobalConfigPath("config.yml"))
if err == nil {
err = yaml.Unmarshal(content, &globalConf)
if err != nil {
return nil, fmt.Errorf("Unable to decode the configuration: %w", err)
}
for k, r := range globalConf.Remotes {
_, ok := c.Remotes[k]
if !ok {
r.Global = true
c.Remotes[k] = r
}
}
}
// Set default values
if c.Remotes == nil {
c.Remotes = make(map[string]Remote)
}
// Apply the static remotes
for k, v := range StaticRemotes {
if c.Remotes[k].Project != "" {
v.Project = c.Remotes[k].Project
}
c.Remotes[k] = v
}
// If the environment specifies a remote this takes priority over what
// is defined in the configuration
envDefaultRemote := os.Getenv("LXC_REMOTE")
if len(envDefaultRemote) > 0 {
c.DefaultRemote = envDefaultRemote
} else if c.DefaultRemote == "" {
c.DefaultRemote = DefaultConfig().DefaultRemote
}
return c, nil
}
// SaveConfig writes the provided configuration to the config file.
func (c *Config) SaveConfig(path string) error {
// Create a new copy for the config file
conf := Config{}
err := shared.DeepCopy(c, &conf)
if err != nil {
return fmt.Errorf("Unable to copy the configuration: %w", err)
}
// Remove the global remotes
for k, v := range c.Remotes {
if v.Global {
delete(conf.Remotes, k)
}
}
defaultRemote := DefaultConfig().DefaultRemote
// Remove the static remotes
for k := range StaticRemotes {
if k == defaultRemote {
continue
}
delete(conf.Remotes, k)
}
// Create the config file (or truncate an existing one)
f, err := os.Create(path)
if err != nil {
return fmt.Errorf("Unable to create the configuration file: %w", err)
}
defer func() { _ = f.Close() }()
// Write the new config
data, err := yaml.Marshal(conf)
if err != nil {
return fmt.Errorf("Unable to marshal the configuration: %w", err)
}
_, err = f.Write(data)
if err != nil {
return fmt.Errorf("Unable to write the configuration: %w", err)
}
err = f.Close()
if err != nil {
return fmt.Errorf("Unable to close the configuration file: %w", err)
}
return nil
}
|
