github.com/bpineau/terraform@v0.8.0-rc1.0.20161126184705-a8886012d185/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/hashicorp/terraform/terraform" 15 "github.com/mattn/go-colorable" 16 "github.com/mitchellh/cli" 17 "github.com/mitchellh/panicwrap" 18 "github.com/mitchellh/prefixedio" 19 ) 20 21 func main() { 22 // Override global prefix set by go-dynect during init() 23 log.SetPrefix("") 24 os.Exit(realMain()) 25 } 26 27 func realMain() int { 28 var wrapConfig panicwrap.WrapConfig 29 30 // don't re-exec terraform as a child process for easier debugging 31 if os.Getenv("TF_FORK") == "0" { 32 return wrappedMain() 33 } 34 35 if !panicwrap.Wrapped(&wrapConfig) { 36 // Determine where logs should go in general (requested by the user) 37 logWriter, err := logging.LogOutput() 38 if err != nil { 39 fmt.Fprintf(os.Stderr, "Couldn't setup log output: %s", err) 40 return 1 41 } 42 43 // We always send logs to a temporary file that we use in case 44 // there is a panic. Otherwise, we delete it. 45 logTempFile, err := ioutil.TempFile("", "terraform-log") 46 if err != nil { 47 fmt.Fprintf(os.Stderr, "Couldn't setup logging tempfile: %s", err) 48 return 1 49 } 50 defer os.Remove(logTempFile.Name()) 51 defer logTempFile.Close() 52 53 // Setup the prefixed readers that send data properly to 54 // stdout/stderr. 55 doneCh := make(chan struct{}) 56 outR, outW := io.Pipe() 57 go copyOutput(outR, doneCh) 58 59 // Create the configuration for panicwrap and wrap our executable 60 wrapConfig.Handler = panicHandler(logTempFile) 61 wrapConfig.Writer = io.MultiWriter(logTempFile, logWriter) 62 wrapConfig.Stdout = outW 63 exitStatus, err := panicwrap.Wrap(&wrapConfig) 64 if err != nil { 65 fmt.Fprintf(os.Stderr, "Couldn't start Terraform: %s", err) 66 return 1 67 } 68 69 // If >= 0, we're the parent, so just exit 70 if exitStatus >= 0 { 71 // Close the stdout writer so that our copy process can finish 72 outW.Close() 73 74 // Wait for the output copying to finish 75 <-doneCh 76 77 return exitStatus 78 } 79 80 // We're the child, so just close the tempfile we made in order to 81 // save file handles since the tempfile is only used by the parent. 82 logTempFile.Close() 83 } 84 85 // Call the real main 86 return wrappedMain() 87 } 88 89 func wrappedMain() int { 90 // We always need to close the DebugInfo before we exit. 91 defer terraform.CloseDebugInfo() 92 93 log.SetOutput(os.Stderr) 94 log.Printf( 95 "[INFO] Terraform version: %s %s %s", 96 Version, VersionPrerelease, GitCommit) 97 log.Printf("[INFO] CLI args: %#v", os.Args) 98 99 // Load the configuration 100 config := BuiltinConfig 101 if err := config.Discover(Ui); err != nil { 102 Ui.Error(fmt.Sprintf("Error discovering plugins: %s", err)) 103 return 1 104 } 105 106 // Load the configuration file if we have one, that can be used to 107 // define extra providers and provisioners. 108 clicfgFile, err := cliConfigFile() 109 if err != nil { 110 Ui.Error(fmt.Sprintf("Error loading CLI configuration: \n\n%s", err)) 111 return 1 112 } 113 114 if clicfgFile != "" { 115 usrcfg, err := LoadConfig(clicfgFile) 116 if err != nil { 117 Ui.Error(fmt.Sprintf("Error loading CLI configuration: \n\n%s", err)) 118 return 1 119 } 120 121 config = *config.Merge(usrcfg) 122 } 123 124 // Run checkpoint 125 go runCheckpoint(&config) 126 127 // Make sure we clean up any managed plugins at the end of this 128 defer plugin.CleanupClients() 129 130 // Get the command line args. We shortcut "--version" and "-v" to 131 // just show the version. 132 args := os.Args[1:] 133 for _, arg := range args { 134 if arg == "-v" || arg == "-version" || arg == "--version" { 135 newArgs := make([]string, len(args)+1) 136 newArgs[0] = "version" 137 copy(newArgs[1:], args) 138 args = newArgs 139 break 140 } 141 } 142 143 cli := &cli.CLI{ 144 Args: args, 145 Commands: Commands, 146 HelpFunc: helpFunc, 147 HelpWriter: os.Stdout, 148 } 149 150 // Initialize the TFConfig settings for the commands... 151 ContextOpts.Providers = config.ProviderFactories() 152 ContextOpts.Provisioners = config.ProvisionerFactories() 153 154 exitCode, err := cli.Run() 155 if err != nil { 156 Ui.Error(fmt.Sprintf("Error executing CLI: %s", err.Error())) 157 return 1 158 } 159 160 return exitCode 161 } 162 163 func cliConfigFile() (string, error) { 164 mustExist := true 165 configFilePath := os.Getenv("TERRAFORM_CONFIG") 166 if configFilePath == "" { 167 var err error 168 configFilePath, err = ConfigFile() 169 mustExist = false 170 171 if err != nil { 172 log.Printf( 173 "[ERROR] Error detecting default CLI config file path: %s", 174 err) 175 } 176 } 177 178 log.Printf("[DEBUG] Attempting to open CLI config file: %s", configFilePath) 179 f, err := os.Open(configFilePath) 180 if err == nil { 181 f.Close() 182 return configFilePath, nil 183 } 184 185 if mustExist || !os.IsNotExist(err) { 186 return "", err 187 } 188 189 log.Println("[DEBUG] File doesn't exist, but doesn't need to. Ignoring.") 190 return "", nil 191 } 192 193 // copyOutput uses output prefixes to determine whether data on stdout 194 // should go to stdout or stderr. This is due to panicwrap using stderr 195 // as the log and error channel. 196 func copyOutput(r io.Reader, doneCh chan<- struct{}) { 197 defer close(doneCh) 198 199 pr, err := prefixedio.NewReader(r) 200 if err != nil { 201 panic(err) 202 } 203 204 stderrR, err := pr.Prefix(ErrorPrefix) 205 if err != nil { 206 panic(err) 207 } 208 stdoutR, err := pr.Prefix(OutputPrefix) 209 if err != nil { 210 panic(err) 211 } 212 defaultR, err := pr.Prefix("") 213 if err != nil { 214 panic(err) 215 } 216 217 var stdout io.Writer = os.Stdout 218 var stderr io.Writer = os.Stderr 219 220 if runtime.GOOS == "windows" { 221 stdout = colorable.NewColorableStdout() 222 stderr = colorable.NewColorableStderr() 223 } 224 225 var wg sync.WaitGroup 226 wg.Add(3) 227 go func() { 228 defer wg.Done() 229 io.Copy(stderr, stderrR) 230 }() 231 go func() { 232 defer wg.Done() 233 io.Copy(stdout, stdoutR) 234 }() 235 go func() { 236 defer wg.Done() 237 io.Copy(stdout, defaultR) 238 }() 239 240 wg.Wait() 241 }