github.com/grange74/terraform@v0.7.0-rc3.0.20160722171430-8c8803864753/main.go (about) 1 package main 2 3 import ( 4 "fmt" 5 "io" 6 "io/ioutil" 7 "log" 8 "os" 9 "runtime" 10 "sync" 11 12 "github.com/hashicorp/go-plugin" 13 "github.com/hashicorp/terraform/helper/logging" 14 "github.com/mattn/go-colorable" 15 "github.com/mitchellh/cli" 16 "github.com/mitchellh/panicwrap" 17 "github.com/mitchellh/prefixedio" 18 ) 19 20 func main() { 21 // Override global prefix set by go-dynect during init() 22 log.SetPrefix("") 23 os.Exit(realMain()) 24 } 25 26 func realMain() int { 27 var wrapConfig panicwrap.WrapConfig 28 29 if !panicwrap.Wrapped(&wrapConfig) { 30 // Determine where logs should go in general (requested by the user) 31 logWriter, err := logging.LogOutput() 32 if err != nil { 33 fmt.Fprintf(os.Stderr, "Couldn't setup log output: %s", err) 34 return 1 35 } 36 37 // We always send logs to a temporary file that we use in case 38 // there is a panic. Otherwise, we delete it. 39 logTempFile, err := ioutil.TempFile("", "terraform-log") 40 if err != nil { 41 fmt.Fprintf(os.Stderr, "Couldn't setup logging tempfile: %s", err) 42 return 1 43 } 44 defer os.Remove(logTempFile.Name()) 45 defer logTempFile.Close() 46 47 // Setup the prefixed readers that send data properly to 48 // stdout/stderr. 49 doneCh := make(chan struct{}) 50 outR, outW := io.Pipe() 51 go copyOutput(outR, doneCh) 52 53 // Create the configuration for panicwrap and wrap our executable 54 wrapConfig.Handler = panicHandler(logTempFile) 55 wrapConfig.Writer = io.MultiWriter(logTempFile, logWriter) 56 wrapConfig.Stdout = outW 57 exitStatus, err := panicwrap.Wrap(&wrapConfig) 58 if err != nil { 59 fmt.Fprintf(os.Stderr, "Couldn't start Terraform: %s", err) 60 return 1 61 } 62 63 // If >= 0, we're the parent, so just exit 64 if exitStatus >= 0 { 65 // Close the stdout writer so that our copy process can finish 66 outW.Close() 67 68 // Wait for the output copying to finish 69 <-doneCh 70 71 return exitStatus 72 } 73 74 // We're the child, so just close the tempfile we made in order to 75 // save file handles since the tempfile is only used by the parent. 76 logTempFile.Close() 77 } 78 79 // Call the real main 80 return wrappedMain() 81 } 82 83 func wrappedMain() int { 84 log.SetOutput(os.Stderr) 85 log.Printf( 86 "[INFO] Terraform version: %s %s %s", 87 Version, VersionPrerelease, GitCommit) 88 89 // Load the configuration 90 config := BuiltinConfig 91 if err := config.Discover(Ui); err != nil { 92 Ui.Error(fmt.Sprintf("Error discovering plugins: %s", err)) 93 return 1 94 } 95 96 // Run checkpoint 97 go runCheckpoint(&config) 98 99 // Make sure we clean up any managed plugins at the end of this 100 defer plugin.CleanupClients() 101 102 // Get the command line args. We shortcut "--version" and "-v" to 103 // just show the version. 104 args := os.Args[1:] 105 for _, arg := range args { 106 if arg == "-v" || arg == "-version" || arg == "--version" { 107 newArgs := make([]string, len(args)+1) 108 newArgs[0] = "version" 109 copy(newArgs[1:], args) 110 args = newArgs 111 break 112 } 113 } 114 115 cli := &cli.CLI{ 116 Args: args, 117 Commands: Commands, 118 HelpFunc: helpFunc, 119 HelpWriter: os.Stdout, 120 } 121 122 // Load the configuration file if we have one, that can be used to 123 // define extra providers and provisioners. 124 clicfgFile, err := cliConfigFile() 125 if err != nil { 126 Ui.Error(fmt.Sprintf("Error loading CLI configuration: \n\n%s", err)) 127 return 1 128 } 129 130 if clicfgFile != "" { 131 usrcfg, err := LoadConfig(clicfgFile) 132 if err != nil { 133 Ui.Error(fmt.Sprintf("Error loading CLI configuration: \n\n%s", err)) 134 return 1 135 } 136 137 config = *config.Merge(usrcfg) 138 } 139 140 // Initialize the TFConfig settings for the commands... 141 ContextOpts.Providers = config.ProviderFactories() 142 ContextOpts.Provisioners = config.ProvisionerFactories() 143 144 exitCode, err := cli.Run() 145 if err != nil { 146 Ui.Error(fmt.Sprintf("Error executing CLI: %s", err.Error())) 147 return 1 148 } 149 150 return exitCode 151 } 152 153 func cliConfigFile() (string, error) { 154 mustExist := true 155 configFilePath := os.Getenv("TERRAFORM_CONFIG") 156 if configFilePath == "" { 157 var err error 158 configFilePath, err = ConfigFile() 159 mustExist = false 160 161 if err != nil { 162 log.Printf( 163 "[ERROR] Error detecting default CLI config file path: %s", 164 err) 165 } 166 } 167 168 log.Printf("[DEBUG] Attempting to open CLI config file: %s", configFilePath) 169 f, err := os.Open(configFilePath) 170 if err == nil { 171 f.Close() 172 return configFilePath, nil 173 } 174 175 if mustExist || !os.IsNotExist(err) { 176 return "", err 177 } 178 179 log.Println("[DEBUG] File doesn't exist, but doesn't need to. Ignoring.") 180 return "", nil 181 } 182 183 // copyOutput uses output prefixes to determine whether data on stdout 184 // should go to stdout or stderr. This is due to panicwrap using stderr 185 // as the log and error channel. 186 func copyOutput(r io.Reader, doneCh chan<- struct{}) { 187 defer close(doneCh) 188 189 pr, err := prefixedio.NewReader(r) 190 if err != nil { 191 panic(err) 192 } 193 194 stderrR, err := pr.Prefix(ErrorPrefix) 195 if err != nil { 196 panic(err) 197 } 198 stdoutR, err := pr.Prefix(OutputPrefix) 199 if err != nil { 200 panic(err) 201 } 202 defaultR, err := pr.Prefix("") 203 if err != nil { 204 panic(err) 205 } 206 207 var stdout io.Writer = os.Stdout 208 var stderr io.Writer = os.Stderr 209 210 if runtime.GOOS == "windows" { 211 stdout = colorable.NewColorableStdout() 212 stderr = colorable.NewColorableStderr() 213 } 214 215 var wg sync.WaitGroup 216 wg.Add(3) 217 go func() { 218 defer wg.Done() 219 io.Copy(stderr, stderrR) 220 }() 221 go func() { 222 defer wg.Done() 223 io.Copy(stdout, stdoutR) 224 }() 225 go func() { 226 defer wg.Done() 227 io.Copy(stdout, defaultR) 228 }() 229 230 wg.Wait() 231 }