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config_file.go
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/
config_file.go
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package config
import (
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"syscall"
"github.com/mitchellh/go-homedir"
"gopkg.in/yaml.v3"
)
func ConfigDir() string {
dir, _ := homedir.Expand("~/.config/gh")
return dir
}
func ConfigFile() string {
return path.Join(ConfigDir(), "config.yml")
}
func hostsConfigFile(filename string) string {
return path.Join(path.Dir(filename), "hosts.yml")
}
func ParseDefaultConfig() (Config, error) {
return ParseConfig(ConfigFile())
}
var ReadConfigFile = func(filename string) ([]byte, error) {
f, err := os.Open(filename)
if err != nil {
return nil, pathError(err)
}
defer f.Close()
data, err := ioutil.ReadAll(f)
if err != nil {
return nil, err
}
return data, nil
}
var WriteConfigFile = func(filename string, data []byte) error {
err := os.MkdirAll(path.Dir(filename), 0771)
if err != nil {
return pathError(err)
}
cfgFile, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600) // cargo coded from setup
if err != nil {
return err
}
defer cfgFile.Close()
n, err := cfgFile.Write(data)
if err == nil && n < len(data) {
err = io.ErrShortWrite
}
return err
}
var BackupConfigFile = func(filename string) error {
return os.Rename(filename, filename+".bak")
}
func parseConfigFile(filename string) ([]byte, *yaml.Node, error) {
data, err := ReadConfigFile(filename)
if err != nil {
return nil, nil, err
}
var root yaml.Node
err = yaml.Unmarshal(data, &root)
if err != nil {
return data, nil, err
}
if len(root.Content) == 0 {
return data, &yaml.Node{
Kind: yaml.DocumentNode,
Content: []*yaml.Node{{Kind: yaml.MappingNode}},
}, nil
}
if root.Content[0].Kind != yaml.MappingNode {
return data, &root, fmt.Errorf("expected a top level map")
}
return data, &root, nil
}
func isLegacy(root *yaml.Node) bool {
for _, v := range root.Content[0].Content {
if v.Value == "github.com" {
return true
}
}
return false
}
func migrateConfig(filename string) error {
b, err := ReadConfigFile(filename)
if err != nil {
return err
}
var hosts map[string][]yaml.Node
err = yaml.Unmarshal(b, &hosts)
if err != nil {
return fmt.Errorf("error decoding legacy format: %w", err)
}
cfg := NewBlankConfig()
for hostname, entries := range hosts {
if len(entries) < 1 {
continue
}
mapContent := entries[0].Content
for i := 0; i < len(mapContent)-1; i += 2 {
if err := cfg.Set(hostname, mapContent[i].Value, mapContent[i+1].Value); err != nil {
return err
}
}
}
err = BackupConfigFile(filename)
if err != nil {
return fmt.Errorf("failed to back up existing config: %w", err)
}
return cfg.Write()
}
func ParseConfig(filename string) (Config, error) {
_, root, err := parseConfigFile(filename)
if err != nil {
if os.IsNotExist(err) {
root = NewBlankRoot()
} else {
return nil, err
}
}
if isLegacy(root) {
err = migrateConfig(filename)
if err != nil {
return nil, fmt.Errorf("error migrating legacy config: %w", err)
}
_, root, err = parseConfigFile(filename)
if err != nil {
return nil, fmt.Errorf("failed to reparse migrated config: %w", err)
}
} else {
if _, hostsRoot, err := parseConfigFile(hostsConfigFile(filename)); err == nil {
if len(hostsRoot.Content[0].Content) > 0 {
newContent := []*yaml.Node{
{Value: "hosts"},
hostsRoot.Content[0],
}
restContent := root.Content[0].Content
root.Content[0].Content = append(newContent, restContent...)
}
} else if !errors.Is(err, os.ErrNotExist) {
return nil, err
}
}
return NewConfig(root), nil
}
func pathError(err error) error {
var pathError *os.PathError
if errors.As(err, &pathError) && errors.Is(pathError.Err, syscall.ENOTDIR) {
if p := findRegularFile(pathError.Path); p != "" {
return fmt.Errorf("remove or rename regular file `%s` (must be a directory)", p)
}
}
return err
}
func findRegularFile(p string) string {
for {
if s, err := os.Stat(p); err == nil && s.Mode().IsRegular() {
return p
}
newPath := path.Dir(p)
if newPath == p || newPath == "/" || newPath == "." {
break
}
p = newPath
}
return ""
}