gopkg.in/tools/godep.v25@v25.0.0-20151106015334-218402f1be30/go.go (about) 1 package main 2 3 import ( 4 "fmt" 5 "log" 6 "os" 7 "os/exec" 8 "path/filepath" 9 "strings" 10 ) 11 12 var cmdGo = &Command{ 13 Usage: "go command [arguments]", 14 Short: "run the go tool with saved dependencies", 15 Long: ` 16 Go runs the go tool with a modified GOPATH giving access to 17 dependencies saved in Godeps. 18 19 Any go tool command can run this way, but "godep go get" 20 is unnecessary and has been disabled. Instead, use 21 "godep go install". 22 `, 23 Run: runGo, 24 } 25 26 // Find the godep GOPATH for this file tree and run the go tool. 27 func runGo(cmd *Command, args []string) { 28 gopath := prepareGopath() 29 if s := os.Getenv("GOPATH"); s != "" { 30 gopath += string(os.PathListSeparator) + os.Getenv("GOPATH") 31 } 32 if len(args) > 0 && args[0] == "get" { 33 log.Printf("invalid subcommand: %q", "go get") 34 fmt.Fprintln(os.Stderr, "Use 'godep go install' instead.") 35 fmt.Fprintln(os.Stderr, "Run 'godep help go' for usage.") 36 os.Exit(2) 37 } 38 c := exec.Command("go", args...) 39 c.Env = append(envNoGopath(), "GOPATH="+gopath) 40 c.Stdin = os.Stdin 41 c.Stdout = os.Stdout 42 c.Stderr = os.Stderr 43 err := c.Run() 44 if err != nil { 45 log.Fatalln("go", err) 46 } 47 } 48 49 // prepareGopath reads dependency information from the filesystem 50 // entry name, fetches any necessary code, and returns a gopath 51 // causing the specified dependencies to be used. 52 func prepareGopath() (gopath string) { 53 dir, isDir := findGodeps() 54 if dir == "" { 55 log.Fatalln("No Godeps found (or in any parent directory)") 56 } 57 if !isDir { 58 log.Fatalln(strings.TrimSpace(needSource)) 59 } 60 return filepath.Join(dir, "Godeps", "_workspace") 61 } 62 63 // findGodeps looks for a directory entry "Godeps" in the 64 // current directory or any parent, and returns the containing 65 // directory and whether the entry itself is a directory. 66 // If Godeps can't be found, findGodeps returns "". 67 // For any other error, it exits the program. 68 func findGodeps() (dir string, isDir bool) { 69 wd, err := os.Getwd() 70 if err != nil { 71 log.Fatalln(err) 72 } 73 return findInParents(wd, "Godeps") 74 } 75 76 // isRoot returns true iff a path is a root. 77 // On Unix: "/". 78 // On Windows: "C:\", "D:\", ... 79 func isRoot(p string) bool { 80 p = filepath.Clean(p) 81 volume := filepath.VolumeName(p) 82 83 p = strings.TrimPrefix(p, volume) 84 p = filepath.ToSlash(p) 85 86 return p == "/" 87 } 88 89 // findInParents returns the path to the directory containing name 90 // in dir or any ancestor, and whether name itself is a directory. 91 // If name cannot be found, findInParents returns the empty string. 92 func findInParents(dir, name string) (container string, isDir bool) { 93 for { 94 fi, err := os.Stat(filepath.Join(dir, name)) 95 if os.IsNotExist(err) && isRoot(dir) { 96 return "", false 97 } 98 if os.IsNotExist(err) { 99 dir = filepath.Dir(dir) 100 continue 101 } 102 if err != nil { 103 log.Fatalln(err) 104 } 105 return dir, fi.IsDir() 106 } 107 } 108 109 func envNoGopath() (a []string) { 110 for _, s := range os.Environ() { 111 if !strings.HasPrefix(s, "GOPATH=") { 112 a = append(a, s) 113 } 114 } 115 return a 116 } 117 118 const needSource = ` 119 outdated Godeps missing source code 120 121 This dependency list was created with an old version of godep. 122 123 To work around this, you have two options: 124 1. Run 'godep restore', and try again. 125 2. Ask the maintainer to switch to a newer version of godep, 126 then try again with the updated package. 127 `