forked from direnv/direnv
/
rc.go
205 lines (164 loc) · 3.53 KB
/
rc.go
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package main
import (
"crypto/sha256"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"time"
)
type RC struct {
path string
mtime int64
allowPath string
}
func FindRC(wd string, allowDir string) *RC {
rcPath := findUp(wd, ".envrc")
if rcPath == "" {
return nil
}
return RCFromPath(rcPath, allowDir)
}
func RCFromPath(path string, allowDir string) *RC {
mtime, err := fileMtime(path)
if err != nil {
return nil
}
hash, err := fileHash(path)
if err != nil {
return nil
}
allowPath := filepath.Join(allowDir, hash)
allowMtime, _ := fileMtime(allowPath)
if allowMtime > mtime {
mtime = allowMtime
}
return &RC{path, mtime, allowPath}
}
func RCFromEnv(path string, mtime int64) *RC {
return &RC{path, mtime, ""}
}
func (self *RC) Allow() (err error) {
if self.allowPath == "" {
return fmt.Errorf("Cannot allow empty path")
}
if err = os.MkdirAll(filepath.Dir(self.allowPath), 0755); err != nil {
return
}
if err = touch(self.allowPath); err != nil {
return
}
self.mtime, err = fileMtime(self.allowPath)
return
}
func (self *RC) Deny() error {
return os.Remove(self.allowPath)
}
func (self *RC) Allowed() bool {
_, err := os.Stat(self.allowPath)
return err == nil
}
func (self *RC) RelTo(wd string) string {
x, err := filepath.Rel(wd, self.path)
if err != nil {
panic(err)
}
return x
}
func (self *RC) Touch() error {
return touch(self.path)
}
const NOT_ALLOWED = "%s is blocked. Run `direnv allow` to approve its content."
func (self *RC) Load(config *Config, env Env) (newEnv Env, err error) {
wd := config.WorkDir
direnv := config.SelfPath
if !self.Allowed() {
return nil, fmt.Errorf(NOT_ALLOWED, self.RelTo(wd))
}
argtmpl := `eval "$("%s" stdlib)" >&2 && source_env "%s" >&2 && "%s" dump`
arg := fmt.Sprintf(argtmpl, direnv, self.RelTo(wd), direnv)
cmd := exec.Command(config.BashPath, "--noprofile", "--norc", "-c", arg)
cmd.Stderr = os.Stderr
cmd.Env = env.ToGoEnv()
cmd.Dir = wd
out, err := cmd.Output()
if err != nil {
return
}
newEnv, err = LoadEnv(string(out))
if err != nil {
return
}
// Save state
newEnv[DIRENV_DIR] = "-" + filepath.Dir(self.path)
newEnv[DIRENV_MTIME] = fmt.Sprintf("%d", self.mtime)
newEnv[DIRENV_DIFF] = env.Diff(newEnv).Serialize()
return
}
/// Utils
func eachDir(path string) (paths []string) {
path, err := filepath.Abs(path)
if err != nil {
return
}
paths = []string{path}
if path == "/" {
return
}
for i := len(path) - 1; i >= 0; i-- {
if path[i] == os.PathSeparator {
path = path[:i]
if path == "" {
path = "/"
}
paths = append(paths, path)
}
}
return
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}
func fileMtime(path string) (int64, error) {
fileInfo, err := os.Stat(path)
if err != nil {
return 0, err
}
return fileInfo.ModTime().Unix(), nil
}
func fileHash(path string) (hash string, err error) {
if path, err = filepath.Abs(path); err != nil {
return
}
fd, err := os.Open(path)
if err != nil {
return
}
hasher := sha256.New()
hasher.Write([]byte(path + "\n"))
if _, err = io.Copy(hasher, fd); err != nil {
return
}
return fmt.Sprintf("%x", hasher.Sum(nil)), nil
}
// Creates a file
func touch(path string) (err error) {
file, err := os.OpenFile(path, os.O_CREATE, 0644)
if err != nil {
return
}
file.Close()
t := time.Now()
return os.Chtimes(path, t, t)
}
func findUp(searchDir string, fileName string) (path string) {
for _, dir := range eachDir(searchDir) {
path = filepath.Join(dir, fileName)
if fileExists(path) {
return
}
}
return ""
}