| 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 | // The getgo command installs Go to the user's system. |
| 9 | package main |
| 10 | |
| 11 | import ( |
| 12 | "bufio" |
| 13 | "context" |
| 14 | "errors" |
| 15 | "flag" |
| 16 | "fmt" |
| 17 | exec "golang.org/x/sys/execabs" |
| 18 | "os" |
| 19 | "strings" |
| 20 | ) |
| 21 | |
| 22 | var ( |
| 23 | interactive = flag.Bool("i", false, "Interactive mode, prompt for inputs.") |
| 24 | verbose = flag.Bool("v", false, "Verbose.") |
| 25 | setupOnly = flag.Bool("skip-dl", false, "Don't download - only set up environment variables") |
| 26 | goVersion = flag.String("version", "", `Version of Go to install (e.g. "1.8.3"). If empty, uses the latest version.`) |
| 27 | |
| 28 | version = "devel" |
| 29 | ) |
| 30 | |
| 31 | var errExitCleanly error = errors.New("exit cleanly sentinel value") |
| 32 | |
| 33 | func main() { |
| 34 | flag.Parse() |
| 35 | if *goVersion != "" && !strings.HasPrefix(*goVersion, "go") { |
| 36 | *goVersion = "go" + *goVersion |
| 37 | } |
| 38 | |
| 39 | ctx := context.Background() |
| 40 | |
| 41 | verbosef("version " + version) |
| 42 | |
| 43 | runStep := func(s step) { |
| 44 | err := s(ctx) |
| 45 | if err == errExitCleanly { |
| 46 | os.Exit(0) |
| 47 | } |
| 48 | if err != nil { |
| 49 | fmt.Fprintln(os.Stderr, err) |
| 50 | os.Exit(2) |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | if !*setupOnly { |
| 55 | runStep(welcome) |
| 56 | runStep(checkOthers) |
| 57 | runStep(chooseVersion) |
| 58 | runStep(downloadGo) |
| 59 | } |
| 60 | |
| 61 | runStep(setupGOPATH) |
| 62 | } |
| 63 | |
| 64 | func verbosef(format string, v ...interface{}) { |
| 65 | if !*verbose { |
| 66 | return |
| 67 | } |
| 68 | |
| 69 | fmt.Printf(format+"\n", v...) |
| 70 | } |
| 71 | |
| 72 | func prompt(ctx context.Context, query, defaultAnswer string) (string, error) { |
| 73 | if !*interactive { |
| 74 | return defaultAnswer, nil |
| 75 | } |
| 76 | |
| 77 | fmt.Printf("%s [%s]: ", query, defaultAnswer) |
| 78 | |
| 79 | type result struct { |
| 80 | answer string |
| 81 | err error |
| 82 | } |
| 83 | ch := make(chan result, 1) |
| 84 | go func() { |
| 85 | s := bufio.NewScanner(os.Stdin) |
| 86 | if !s.Scan() { |
| 87 | ch <- result{"", s.Err()} |
| 88 | return |
| 89 | } |
| 90 | answer := s.Text() |
| 91 | if answer == "" { |
| 92 | answer = defaultAnswer |
| 93 | } |
| 94 | ch <- result{answer, nil} |
| 95 | }() |
| 96 | |
| 97 | select { |
| 98 | case r := <-ch: |
| 99 | return r.answer, r.err |
| 100 | case <-ctx.Done(): |
| 101 | return "", ctx.Err() |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | func runCommand(ctx context.Context, prog string, args ...string) ([]byte, error) { |
| 106 | verbosef("Running command: %s %v", prog, args) |
| 107 | |
| 108 | cmd := exec.CommandContext(ctx, prog, args...) |
| 109 | out, err := cmd.CombinedOutput() |
| 110 | if err != nil { |
| 111 | return nil, fmt.Errorf("running cmd '%s %s' failed: %s err: %v", prog, strings.Join(args, " "), string(out), err) |
| 112 | } |
| 113 | if out != nil && err == nil && len(out) != 0 { |
| 114 | verbosef("%s", out) |
| 115 | } |
| 116 | |
| 117 | return out, nil |
| 118 | } |
| 119 |
Members