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// Package config provides methods for configuring the petrific binary.
//
// The configuration file is located in `$XDG_CONFIG_HOME/petrific/config.toml`,
// where `$XDG_CONFIG_HOME` is typically `~/.config`.
//
// The configuration file is a TOML file, its main purpose is to define the used
// storage backends, it also defines which GPG key to use for snapshot signing.
//
// Here is an example configuration file:
//
// # This config key defines the default storage backend, as defined below ([storage.local_compressed])
// default_storage = "local_compressed"
//
// [signing]
// # Use this GPG key to sign snapshots
// key = "0123456789ABCDEF0123456789ABCDEF01234567"
//
// # The storage.* sections define storage backends.
// # Every section must contain the key `method`, the other keys depend on the selected method.
// # For more details see the documentation for ../storage
//
// [storage.local]
// method="local"
// path="~/.local/share/petrific"
//
// [storage.local_compressed]
// method="filter"
// base="local"
// encode=["zlib-flate", "-compress"]
// decode=["zlib-flate", "-uncompress"]
package config
import (
"errors"
"fmt"
"github.com/BurntSushi/toml"
"github.com/adrg/xdg"
"github.com/silvasur/petrific/gpg"
"os"
"os/user"
"strings"
)
type StorageConfigErr struct {
Name string
Err error
}
func (sce StorageConfigErr) Error() string {
return fmt.Sprintf("Could not get configuration for storage %s: %s", sce.Name, sce.Err.Error())
}
var (
StorageConfigNotFound = errors.New("Not found")
)
type Config struct {
DefaultStorage string `toml:"default_storage"`
Signing struct {
Key string
}
Storage map[string]toml.Primitive
meta toml.MetaData `toml:"-"`
}
func LoadConfig(path string) (config Config, err error) {
if path == "" {
path, err = xdg.ConfigFile("petrific/config.toml")
if err != nil {
return
}
}
meta, err := toml.DecodeFile(path, &config)
config.meta = meta
return config, err
}
func (c Config) GPGSigner() gpg.Signer {
return gpg.Signer{c.Signing.Key}
}
func (c Config) GetStorageMethod(name string) (string, error) {
prim, ok := c.Storage[name]
if !ok {
return "", StorageConfigErr{name, StorageConfigNotFound}
}
var method_wrap struct{ Method string }
err := c.meta.PrimitiveDecode(prim, &method_wrap)
if err != nil {
return "", StorageConfigErr{name, err}
}
return method_wrap.Method, nil
}
func (c Config) GetStorageConfData(name string, v interface{}) error {
prim, ok := c.Storage[name]
if !ok {
return StorageConfigErr{name, StorageConfigNotFound}
}
return c.meta.PrimitiveDecode(prim, v)
}
func ExpandTilde(path string) string {
home, ok := os.LookupEnv("HOME")
if !ok {
u, err := user.Current()
if err != nil {
return path
}
home = u.HomeDir
}
if home == "" {
return path
}
parts := strings.Split(path, string(os.PathSeparator))
if len(parts) > 0 && parts[0] == "~" {
parts[0] = home
}
return strings.Join(parts, string(os.PathSeparator))
}
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