forked from TrueCloudLab/restic
64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
// +build !windows
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// Copyright 2016 (C) Mitchell Hashimoto
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// Distributed under the MIT License.
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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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"os/user"
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"strconv"
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"strings"
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)
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// dir returns the homedir of current user for all POSIX compatible
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// operating systems.
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func dir() (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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// user.Current is not implemented for i386 and PNaCL like environments.
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if currUser, err := user.Current(); err == nil {
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return currUser.HomeDir, 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 "getent" is missing, ignore 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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