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137 lines
2.9 KiB
137 lines
2.9 KiB
package homedir
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import (
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"bytes"
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"errors"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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"sync"
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)
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// DisableCache will disable caching of the home directory. Caching is enabled
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// by default.
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var DisableCache bool
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var homedirCache string
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var cacheLock sync.RWMutex
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// Dir returns the home directory for the executing user.
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//
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// This uses an OS-specific method for discovering the home directory.
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// An error is returned if a home directory cannot be detected.
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func Dir() (string, error) {
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if !DisableCache {
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cacheLock.RLock()
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cached := homedirCache
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cacheLock.RUnlock()
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if cached != "" {
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return cached, nil
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}
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}
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cacheLock.Lock()
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defer cacheLock.Unlock()
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var result string
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var err error
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if runtime.GOOS == "windows" {
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result, err = dirWindows()
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} else {
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// Unix-like system, so just assume Unix
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result, err = dirUnix()
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}
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if err != nil {
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return "", err
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}
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homedirCache = result
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return result, nil
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}
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// Expand expands the path to include the home directory if the path
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// is prefixed with `~`. If it isn't prefixed with `~`, the path is
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// returned as-is.
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func Expand(path string) (string, error) {
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if len(path) == 0 {
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return path, nil
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}
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if path[0] != '~' {
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return path, nil
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}
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if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
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return "", errors.New("cannot expand user-specific home dir")
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}
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dir, err := Dir()
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if err != nil {
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return "", err
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}
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return filepath.Join(dir, path[1:]), nil
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}
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func dirUnix() (string, error) {
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// First prefer the HOME environmental variable
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if home := os.Getenv("HOME"); home != "" {
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return home, nil
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}
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// If that fails, try getent
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var stdout bytes.Buffer
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cmd := exec.Command("getent", "passwd", strconv.Itoa(os.Getuid()))
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cmd.Stdout = &stdout
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if err := cmd.Run(); err != nil {
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// If the error is ErrNotFound, we ignore it. Otherwise, return it.
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if err != exec.ErrNotFound {
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return "", err
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}
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} else {
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if passwd := strings.TrimSpace(stdout.String()); passwd != "" {
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// username:password:uid:gid:gecos:home:shell
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passwdParts := strings.SplitN(passwd, ":", 7)
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if len(passwdParts) > 5 {
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return passwdParts[5], nil
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}
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}
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}
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// If all else fails, try the shell
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stdout.Reset()
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cmd = exec.Command("sh", "-c", "cd && pwd")
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cmd.Stdout = &stdout
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if err := cmd.Run(); err != nil {
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return "", err
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}
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result := strings.TrimSpace(stdout.String())
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if result == "" {
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return "", errors.New("blank output when reading home directory")
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}
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return result, nil
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}
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func dirWindows() (string, error) {
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// First prefer the HOME environmental variable
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if home := os.Getenv("HOME"); home != "" {
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return home, nil
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}
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drive := os.Getenv("HOMEDRIVE")
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path := os.Getenv("HOMEPATH")
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home := drive + path
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if drive == "" || path == "" {
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home = os.Getenv("USERPROFILE")
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}
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if home == "" {
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return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
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}
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return home, nil
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}
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