mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-10-15 07:27:15 +00:00
961c878e0d
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
158 lines
3.4 KiB
Go
158 lines
3.4 KiB
Go
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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homeEnv := "HOME"
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if runtime.GOOS == "plan9" {
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// On plan9, env vars are lowercase.
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homeEnv = "home"
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}
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// First prefer the HOME environmental variable
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if home := os.Getenv(homeEnv); home != "" {
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return home, nil
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}
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var stdout bytes.Buffer
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// If that fails, try OS specific commands
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if runtime.GOOS == "darwin" {
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cmd := exec.Command("sh", "-c", `dscl -q . -read /Users/"$(whoami)" NFSHomeDirectory | sed 's/^[^ ]*: //'`)
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cmd.Stdout = &stdout
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if err := cmd.Run(); err == nil {
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result := strings.TrimSpace(stdout.String())
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if result != "" {
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return result, nil
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}
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}
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} else {
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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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}
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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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// Prefer standard environment variable USERPROFILE
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if home := os.Getenv("USERPROFILE"); 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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return "", errors.New("HOMEDRIVE, HOMEPATH, or USERPROFILE are blank")
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}
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return home, nil
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}
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