| 1 | // Copyright 2017 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | //go:build !plan9 |
| 6 | // +build !plan9 |
| 7 | |
| 8 | package main |
| 9 | |
| 10 | import ( |
| 11 | "bufio" |
| 12 | "context" |
| 13 | "fmt" |
| 14 | "os" |
| 15 | "os/user" |
| 16 | "path/filepath" |
| 17 | "runtime" |
| 18 | "strings" |
| 19 | ) |
| 20 | |
| 21 | const ( |
| 22 | bashConfig = ".bash_profile" |
| 23 | zshConfig = ".zshrc" |
| 24 | ) |
| 25 | |
| 26 | // appendToPATH adds the given path to the PATH environment variable and |
| 27 | // persists it for future sessions. |
| 28 | func appendToPATH(value string) error { |
| 29 | if isInPATH(value) { |
| 30 | return nil |
| 31 | } |
| 32 | return persistEnvVar("PATH", pathVar+envSeparator+value) |
| 33 | } |
| 34 | |
| 35 | func isInPATH(dir string) bool { |
| 36 | p := os.Getenv("PATH") |
| 37 | |
| 38 | paths := strings.Split(p, envSeparator) |
| 39 | for _, d := range paths { |
| 40 | if d == dir { |
| 41 | return true |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | return false |
| 46 | } |
| 47 | |
| 48 | func getHomeDir() (string, error) { |
| 49 | home := os.Getenv(homeKey) |
| 50 | if home != "" { |
| 51 | return home, nil |
| 52 | } |
| 53 | |
| 54 | u, err := user.Current() |
| 55 | if err != nil { |
| 56 | return "", err |
| 57 | } |
| 58 | return u.HomeDir, nil |
| 59 | } |
| 60 | |
| 61 | func checkStringExistsFile(filename, value string) (bool, error) { |
| 62 | file, err := os.OpenFile(filename, os.O_RDONLY, 0600) |
| 63 | if err != nil { |
| 64 | if os.IsNotExist(err) { |
| 65 | return false, nil |
| 66 | } |
| 67 | return false, err |
| 68 | } |
| 69 | defer file.Close() |
| 70 | |
| 71 | scanner := bufio.NewScanner(file) |
| 72 | for scanner.Scan() { |
| 73 | line := scanner.Text() |
| 74 | if line == value { |
| 75 | return true, nil |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | return false, scanner.Err() |
| 80 | } |
| 81 | |
| 82 | func appendToFile(filename, value string) error { |
| 83 | verbosef("Adding %q to %s", value, filename) |
| 84 | |
| 85 | ok, err := checkStringExistsFile(filename, value) |
| 86 | if err != nil { |
| 87 | return err |
| 88 | } |
| 89 | if ok { |
| 90 | // Nothing to do. |
| 91 | return nil |
| 92 | } |
| 93 | |
| 94 | f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600) |
| 95 | if err != nil { |
| 96 | return err |
| 97 | } |
| 98 | defer f.Close() |
| 99 | |
| 100 | _, err = f.WriteString(lineEnding + value + lineEnding) |
| 101 | return err |
| 102 | } |
| 103 | |
| 104 | func isShell(name string) bool { |
| 105 | return strings.Contains(currentShell(), name) |
| 106 | } |
| 107 | |
| 108 | // persistEnvVarWindows sets an environment variable in the Windows |
| 109 | // registry. |
| 110 | func persistEnvVarWindows(name, value string) error { |
| 111 | _, err := runCommand(context.Background(), "powershell", "-command", |
| 112 | fmt.Sprintf(`[Environment]::SetEnvironmentVariable("%s", "%s", "User")`, name, value)) |
| 113 | return err |
| 114 | } |
| 115 | |
| 116 | func persistEnvVar(name, value string) error { |
| 117 | if runtime.GOOS == "windows" { |
| 118 | if err := persistEnvVarWindows(name, value); err != nil { |
| 119 | return err |
| 120 | } |
| 121 | |
| 122 | if isShell("cmd.exe") || isShell("powershell.exe") { |
| 123 | return os.Setenv(strings.ToUpper(name), value) |
| 124 | } |
| 125 | // User is in bash, zsh, etc. |
| 126 | // Also set the environment variable in their shell config. |
| 127 | } |
| 128 | |
| 129 | rc, err := shellConfigFile() |
| 130 | if err != nil { |
| 131 | return err |
| 132 | } |
| 133 | |
| 134 | line := fmt.Sprintf("export %s=%s", strings.ToUpper(name), value) |
| 135 | if err := appendToFile(rc, line); err != nil { |
| 136 | return err |
| 137 | } |
| 138 | |
| 139 | return os.Setenv(strings.ToUpper(name), value) |
| 140 | } |
| 141 | |
| 142 | func shellConfigFile() (string, error) { |
| 143 | home, err := getHomeDir() |
| 144 | if err != nil { |
| 145 | return "", err |
| 146 | } |
| 147 | |
| 148 | switch { |
| 149 | case isShell("bash"): |
| 150 | return filepath.Join(home, bashConfig), nil |
| 151 | case isShell("zsh"): |
| 152 | return filepath.Join(home, zshConfig), nil |
| 153 | default: |
| 154 | return "", fmt.Errorf("%q is not a supported shell", currentShell()) |
| 155 | } |
| 156 | } |
| 157 |
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