main.go

   1 // xds-gdb: a wrapper on gdb tool for X(cross) Development System.
   2 package main
   3
   4 import (
   5         "bufio"
   6         "fmt"
   7         "io/ioutil"
   8         "os"
   9         "os/signal"
  10         "os/user"
  11         "syscall"
  12         "time"
  13
  14         "strings"
  15
  16         "path"
  17
  18         "github.com/Sirupsen/logrus"
  19         "github.com/codegangsta/cli"
  20         common "github.com/iotbzh/xds-common/golib"
  21         "github.com/joho/godotenv"
  22 )
  23
  24 var appAuthors = []cli.Author{
  25         cli.Author{Name: "Sebastien Douheret", Email: "sebastien@iot.bzh"},
  26 }
  27
  28 // AppName name of this application
  29 var AppName = "xds-gdb"
  30
  31 // AppVersion Version of this application
  32 // (set by Makefile)
  33 var AppVersion = "?.?.?"
  34
  35 // AppSubVersion is the git tag id added to version string
  36 // Should be set by compilation -ldflags "-X main.AppSubVersion=xxx"
  37 // (set by Makefile)
  38 var AppSubVersion = "unknown-dev"
  39
  40 // Create logger
  41 var log = logrus.New()
  42 var earlyLog = []string{}
  43
  44 // Application details
  45 const (
  46         appCopyright    = "Apache-2.0"
  47         defaultLogLevel = "warning"
  48 )
  49
  50 // Exit events
  51 type exitResult struct {
  52         error error
  53         code  int
  54 }
  55
  56 // EnvVar - Environment variables used by application
  57 type EnvVar struct {
  58         Name        string
  59         Usage       string
  60         Destination *string
  61 }
  62
  63 // exitError terminates this program with the specified error
  64 func exitError(code syscall.Errno, f string, a ...interface{}) {
  65         err := fmt.Sprintf(f, a...)
  66         fmt.Fprintf(os.Stderr, err+"\n")
  67         os.Exit(int(code))
  68 }
  69
  70 // main
  71 func main() {
  72         var uri, prjID, rPath, logLevel, logFile, sdkid, confFile, gdbNative string
  73         var listProject bool
  74         var err error
  75
  76         uri = "localhost:8000"
  77         logLevel = defaultLogLevel
  78
  79         // Create a new App instance
  80         app := cli.NewApp()
  81         app.Name = AppName
  82         app.Usage = "wrapper on gdb for X(cross) Development System."
  83         app.Version = AppVersion + " (" + AppSubVersion + ")"
  84         app.Authors = appAuthors
  85         app.Copyright = appCopyright
  86         app.Metadata = make(map[string]interface{})
  87         app.Metadata["version"] = AppVersion
  88         app.Metadata["git-tag"] = AppSubVersion
  89         app.Metadata["logger"] = log
  90
  91         app.Flags = []cli.Flag{
  92                 cli.BoolFlag{
  93                         Name:        "list, ls",
  94                         Usage:       "list existing xds projects",
  95                         Destination: &listProject,
  96                 },
  97         }
  98
  99         appEnvVars := []EnvVar{
 100                 EnvVar{
 101                         Name:        "XDS_CONFIG",
 102                         Usage:       "env config file to source on startup",
 103                         Destination: &confFile,
 104                 },
 105                 EnvVar{
 106                         Name:        "XDS_LOGLEVEL",
 107                         Usage:       "logging level (supported levels: panic, fatal, error, warn, info, debug)",
 108                         Destination: &logLevel,
 109                 },
 110                 EnvVar{
 111                         Name:        "XDS_LOGFILE",
 112                         Usage:       "logging file",
 113                         Destination: &logFile,
 114                 },
 115                 EnvVar{
 116                         Name:        "XDS_NATIVE_GDB",
 117                         Usage:       "use native gdb instead of remote XDS server",
 118                         Destination: &gdbNative,
 119                 },
 120                 EnvVar{
 121                         Name:        "XDS_PROJECT_ID",
 122                         Usage:       "project ID you want to build (mandatory variable)",
 123                         Destination: &prjID,
 124                 },
 125                 EnvVar{
 126                         Name:        "XDS_RPATH",
 127                         Usage:       "relative path into project",
 128                         Destination: &rPath,
 129                 },
 130                 EnvVar{
 131                         Name:        "XDS_SDK_ID",
 132                         Usage:       "Cross Sdk ID to use to build project",
 133                         Destination: &sdkid,
 134                 },
 135                 EnvVar{
 136                         Name:        "XDS_SERVER_URL",
 137                         Usage:       "remote XDS server url",
 138                         Destination: &uri,
 139                 },
 140         }
 141
 142         // Process gdb arguments
 143         args := make([]string, len(os.Args))
 144         args[0] = os.Args[0]
 145         gdbArgs := make([]string, len(os.Args))
 146
 147         // Split xds-xxx options from gdb options
 148         copy(gdbArgs, os.Args[1:])
 149         for idx, a := range os.Args[1:] {
 150                 // Specific case to print help or version of xds-gdb
 151                 switch a {
 152                 case "--help", "-h", "--version", "-v":
 153                         args[1] = a
 154                         goto endloop
 155                 case "--":
 156                         // Detect skip option (IOW '--') to split arguments
 157                         copy(args, os.Args[0:idx+1])
 158                         copy(gdbArgs, os.Args[idx+2:])
 159                         goto endloop
 160                 }
 161         }
 162 endloop:
 163
 164         // Parse gdb arguments to detect:
 165         //  --tty option: used for inferior/ tty of debugged program
 166         //  -x/--command option: XDS env vars may be set within gdb command file
 167         clientPty := ""
 168         gdbCmdFile := ""
 169         for idx, a := range gdbArgs {
 170                 switch {
 171                 case strings.HasPrefix(a, "--tty="):
 172                         clientPty = a[len("--tty="):]
 173                         gdbArgs[idx] = ""
 174
 175                 case a == "--tty":
 176                 case strings.HasPrefix(a, "-tty"):
 177                         clientPty = gdbArgs[idx+1]
 178                         gdbArgs[idx] = ""
 179                         gdbArgs[idx+1] = ""
 180
 181                 case strings.HasPrefix(a, "--command="):
 182                         gdbCmdFile = a[len("--command="):]
 183
 184                 case a == "--command":
 185                 case strings.HasPrefix(a, "-x"):
 186                         gdbCmdFile = gdbArgs[idx+1]
 187                 }
 188         }
 189
 190         // Source config env file
 191         // (we cannot use confFile var because env variables setting is just after)
 192         envMap, confFile, err := loadConfigEnvFile(os.Getenv("XDS_CONFIG"), gdbCmdFile)
 193         if err != nil {
 194                 exitError(syscall.ENOENT, err.Error())
 195         }
 196
 197         // Managed env vars and create help
 198         dynDesc := "\nENVIRONMENT VARIABLES:"
 199         for _, ev := range appEnvVars {
 200                 dynDesc += fmt.Sprintf("\n %s \t\t %s", ev.Name, ev.Usage)
 201                 if evVal, evExist := os.LookupEnv(ev.Name); evExist && ev.Destination != nil {
 202                         *ev.Destination = evVal
 203                 }
 204         }
 205         app.Description = "gdb wrapper for X(cross) Development System\n"
 206         app.Description += "\n"
 207         app.Description += " Two debugging models are supported:\n"
 208         app.Description += "  - xds remote debugging requiring an XDS server and allowing cross debug\n"
 209         app.Description += "  - native debugging\n"
 210         app.Description += " By default xds remote debug is used and you need to define XDS_NATIVE_GDB to\n"
 211         app.Description += " use native gdb debug mode instead.\n"
 212         app.Description += "\n"
 213         app.Description += " xds-gdb configuration (see variables list below) can be set using:\n"
 214         app.Description += "  - a config file (XDS_CONFIG)\n"
 215         app.Description += "  - or environment variables\n"
 216         app.Description += "  - or by setting variables within gdb ini file (commented line including :XDS-ENV: tag)\n"
 217         app.Description += "    Example of gdb ini file where we define project and sdk ID:\n"
 218         app.Description += "     # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject\n"
 219         app.Description += "     # :XDS-ENV: XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot\n"
 220         app.Description += "\n"
 221         app.Description += dynDesc + "\n"
 222
 223         // only one action
 224         app.Action = func(ctx *cli.Context) error {
 225                 var err error
 226                 curDir, _ := os.Getwd()
 227
 228                 // Set logger level, formatter and log file
 229                 if log.Level, err = logrus.ParseLevel(logLevel); err != nil {
 230                         msg := fmt.Sprintf("Invalid log level : \"%v\"\n", logLevel)
 231                         return cli.NewExitError(msg, int(syscall.EINVAL))
 232                 }
 233                 log.Formatter = &logrus.TextFormatter{}
 234
 235                 // Always log into a file
 236                 if logFile == "" {
 237                         logFile = "/tmp/xds-gdb.log"
 238                 }
 239                 fdL, err := os.OpenFile(logFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
 240                 if err != nil {
 241                         msgErr := fmt.Sprintf("Cannot create log file %s", logFile)
 242                         return cli.NewExitError(msgErr, int(syscall.EPERM))
 243                 }
 244                 log.Out = fdL
 245
 246                 // Build env variables
 247                 env := []string{}
 248                 for k, v := range envMap {
 249                         env = append(env, k+"="+v)
 250                 }
 251
 252                 // Create cross or native gdb interface
 253                 var gdb IGDB
 254                 if gdbNative != "" {
 255                         gdb = NewGdbNative(log, gdbArgs, env)
 256                 } else {
 257                         gdb = NewGdbXds(log, gdbArgs, env)
 258                         gdb.SetConfig("uri", uri)
 259                         gdb.SetConfig("prjID", prjID)
 260                         gdb.SetConfig("sdkID", sdkid)
 261                         gdb.SetConfig("rPath", rPath)
 262                         gdb.SetConfig("listProject", listProject)
 263                 }
 264
 265                 // Log early print
 266                 for _, msg := range earlyLog {
 267                         log.Debugf(msg)
 268                 }
 269
 270                 // Log useful info
 271                 log.Infof("Original arguments: %v", os.Args)
 272                 log.Infof("Current directory : %v", curDir)
 273                 log.Infof("Use confFile      : '%s'", confFile)
 274                 log.Infof("Execute           : /exec %v %v", gdb.Cmd(), gdb.Args())
 275
 276                 // Properly report invalid init file error
 277                 gdbCommandFileError := ""
 278                 for i, a := range gdbArgs {
 279                         if a == "-x" {
 280                                 gdbCommandFileError = gdbArgs[i+1] + ": No such file or directory."
 281                                 break
 282                         } else if strings.HasPrefix(a, "--command=") {
 283                                 gdbCommandFileError = strings.TrimLeft(a, "--command=") + ": No such file or directory."
 284                                 break
 285                         }
 286                 }
 287                 log.Infof("Add detection of error: <%s>", gdbCommandFileError)
 288
 289                 // Init gdb subprocess management
 290                 if code, err := gdb.Init(); err != nil {
 291                         return cli.NewExitError(err.Error(), code)
 292                 }
 293
 294                 exitChan := make(chan exitResult, 1)
 295
 296                 gdb.OnError(func(err error) {
 297                         fmt.Println("ERROR: ", err.Error())
 298                 })
 299
 300                 gdb.OnDisconnect(func(err error) {
 301                         fmt.Println("Disconnection: ", err.Error())
 302                         exitChan <- exitResult{err, int(syscall.ESHUTDOWN)}
 303                 })
 304
 305                 gdb.Read(func(timestamp, stdout, stderr string) {
 306                         if stdout != "" {
 307                                 fmt.Printf("%s", stdout)
 308                                 log.Debugf("Recv OUT: <%s>", stdout)
 309                         }
 310                         if stderr != "" {
 311                                 fmt.Fprintf(os.Stderr, "%s", stderr)
 312                                 log.Debugf("Recv ERR: <%s>", stderr)
 313                         }
 314
 315                         // Correctly report error about init file
 316                         if gdbCommandFileError != "" && strings.Contains(stdout, gdbCommandFileError) {
 317                                 fmt.Fprintf(os.Stderr, "ERROR: "+gdbCommandFileError)
 318                                 log.Errorf("ERROR: " + gdbCommandFileError)
 319                                 if err := gdb.SendSignal(syscall.SIGTERM); err != nil {
 320                                         log.Errorf("Error while sending signal: %s", err.Error())
 321                                 }
 322                                 exitChan <- exitResult{err, int(syscall.ENOENT)}
 323                         }
 324                 })
 325
 326                 gdb.OnExit(func(code int, err error) {
 327                         exitChan <- exitResult{err, code}
 328                 })
 329
 330                 // Handle client tty / pts
 331                 if clientPty != "" {
 332                         log.Infoln("Client tty detected: %v\n", clientPty)
 333
 334                         cpFd, err := os.OpenFile(clientPty, os.O_RDWR, 0)
 335                         if err != nil {
 336                                 return cli.NewExitError(err.Error(), int(syscall.EPERM))
 337                         }
 338                         defer cpFd.Close()
 339
 340                         // client tty stdin
 341                         /* XXX TODO - implement stdin to send data to debugged program
 342                         go func() {
 343                                 reader := bufio.NewReader(cpFd)
 344                                 sc := bufio.NewScanner(reader)
 345                                 for sc.Scan() {
 346                                         data := sc.Text()
 347                                         iosk.Emit(apiv1.ExecInferiorInEvent, data+"\n")
 348                                         log.Debugf("Inferior IN: <%v>", data)
 349                                 }
 350                                 if sc.Err() != nil {
 351                                         log.Warnf("Inferior Stdin scanner exit, close stdin (err=%v)", sc.Err())
 352                                 }
 353                         }()
 354                         */
 355
 356                         // client tty stdout
 357                         gdb.InferiorRead(func(timestamp, stdout, stderr string) {
 358                                 if stdout != "" {
 359                                         fmt.Fprintf(cpFd, "%s", stdout)
 360                                         log.Debugf("Inferior OUT: <%s>", stdout)
 361                                 }
 362                                 if stderr != "" {
 363                                         fmt.Fprintf(cpFd, "%s", stderr)
 364                                         log.Debugf("Inferior ERR: <%s>", stderr)
 365                                 }
 366                         })
 367                 }
 368
 369                 // Allow to overwrite some gdb commands
 370                 var overwriteMap = make(map[string]string)
 371                 if overEnv, exist := os.LookupEnv("XDS_OVERWRITE_COMMANDS"); exist {
 372                         overEnvS := strings.TrimSpace(overEnv)
 373                         if len(overEnvS) > 0 {
 374                                 // Extract overwrite commands from env variable
 375                                 for _, def := range strings.Split(overEnvS, ",") {
 376                                         if kv := strings.Split(def, ":"); len(kv) == 2 {
 377                                                 overwriteMap[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
 378                                         } else {
 379                                                 return cli.NewExitError(
 380                                                         fmt.Errorf("Invalid definition in XDS_OVERWRITE_COMMANDS (%s)", def),
 381                                                         int(syscall.EINVAL))
 382                                         }
 383                                 }
 384                         }
 385                 } else {
 386                         overwriteMap["-exec-run"] = "-exec-continue"
 387                         overwriteMap["-file-exec-and-symbols"] = "-file-exec-file"
 388                 }
 389                 log.Debugf("overwriteMap = %v", overwriteMap)
 390
 391                 // Send stdin though WS
 392                 go func() {
 393                         paranoia := 600
 394                         reader := bufio.NewReader(os.Stdin)
 395
 396                         for {
 397                                 sc := bufio.NewScanner(reader)
 398                                 for sc.Scan() {
 399                                         command := sc.Text()
 400
 401                                         // overwrite some commands
 402                                         for key, value := range overwriteMap {
 403                                                 if strings.Contains(command, key) {
 404                                                         command = strings.Replace(command, key, value, 1)
 405                                                         log.Debugf("OVERWRITE %s -> %s", key, value)
 406                                                 }
 407                                         }
 408                                         gdb.Write(command + "\n")
 409                                         log.Debugf("Send: <%v>", command)
 410                                 }
 411                                 log.Infof("Stdin scanner exit, close stdin (err=%v)", sc.Err())
 412
 413                                 // CTRL-D exited scanner, so send it explicitly
 414                                 gdb.Write("\x04")
 415                                 time.Sleep(time.Millisecond * 100)
 416
 417                                 if paranoia--; paranoia <= 0 {
 418                                         msg := "Abnormal loop detected on stdin"
 419                                         log.Errorf("Abnormal loop detected on stdin")
 420                                         gdb.SendSignal(syscall.SIGTERM)
 421                                         exitChan <- exitResult{fmt.Errorf(msg), int(syscall.ELOOP)}
 422                                 }
 423                         }
 424                 }()
 425
 426                 // Handling all Signals
 427                 sigs := make(chan os.Signal, 1)
 428                 signal.Notify(sigs)
 429
 430                 go func() {
 431                         for {
 432                                 sig := <-sigs
 433                                 if err := gdb.SendSignal(sig); err != nil {
 434                                         log.Errorf("Error while sending signal: %s", err.Error())
 435                                 }
 436                         }
 437                 }()
 438
 439                 // Start gdb
 440                 if code, err := gdb.Start(clientPty != ""); err != nil {
 441                         return cli.NewExitError(err.Error(), code)
 442                 }
 443
 444                 // Wait exit
 445                 select {
 446                 case res := <-exitChan:
 447                         errStr := ""
 448                         if res.code == 0 {
 449                                 log.Infoln("Exit successfully")
 450                         }
 451                         if res.error != nil {
 452                                 log.Infoln("Exit with ERROR: ", res.error.Error())
 453                                 errStr = res.error.Error()
 454                         }
 455                         return cli.NewExitError(errStr, res.code)
 456                 }
 457         }
 458
 459         app.Run(args)
 460 }
 461
 462 // loadConfigEnvFile
 463 func loadConfigEnvFile(confFile, gdbCmdFile string) (map[string]string, string, error) {
 464         var err error
 465         envMap := make(map[string]string)
 466
 467         // 1- if no confFile set, use setting from gdb command file is option
 468         //    --command/-x is set
 469         if confFile == "" && gdbCmdFile != "" {
 470                 logEarly("Try extract config from gdbCmdFile: %s", gdbCmdFile)
 471                 confFile, err = extractEnvFromCmdFile(gdbCmdFile)
 472                 if confFile != "" {
 473                         defer os.Remove(confFile)
 474                 }
 475                 if err != nil {
 476                         return envMap, confFile, fmt.Errorf(err.Error())
 477                 }
 478         }
 479         // 2- search xds-gdb.env file in various locations
 480         if confFile == "" {
 481                 curDir, _ := os.Getwd()
 482                 if u, err := user.Current(); err == nil {
 483                         xdsEnvFile := "xds-gdb.env"
 484                         for _, d := range []string{
 485                                 path.Join(curDir),
 486                                 path.Join(curDir, "..", ".."),
 487                                 path.Join(curDir, "../../target"),
 488                                 path.Join(u.HomeDir, ".xds"),
 489                         } {
 490                                 confFile = path.Join(d, xdsEnvFile)
 491                                 logEarly("Search config in %s", confFile)
 492                                 if common.Exists(confFile) {
 493                                         break
 494                                 }
 495                         }
 496                 }
 497         }
 498
 499         if confFile == "" {
 500                 return envMap, "", nil
 501         }
 502
 503         if !common.Exists(confFile) {
 504                 return envMap, confFile, fmt.Errorf("Error no env config file not found")
 505         }
 506         if err = godotenv.Load(confFile); err != nil {
 507                 return envMap, confFile, fmt.Errorf("Error loading env config file " + confFile)
 508         }
 509         if envMap, err = godotenv.Read(confFile); err != nil {
 510                 return envMap, confFile, fmt.Errorf("Error reading env config file " + confFile)
 511         }
 512         return envMap, confFile, nil
 513 }
 514
 515 /*
 516  extractEnvFromCmdFile: extract xds-gdb env variable from gdb command file
 517   All commented lines (#) in gdb command file that start with ':XDS-ENV:' prefix
 518   will be considered as XDS env commands. For example the 3 syntaxes below
 519   are supported:
 520   # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject
 521   #:XDS-ENV:XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot
 522   # :XDS-ENV:  export XDS_SERVER_URL=localhost:8800
 523 */
 524 func extractEnvFromCmdFile(cmdFile string) (string, error) {
 525         if !common.Exists(cmdFile) {
 526                 return "", nil
 527         }
 528         cFd, err := os.Open(cmdFile)
 529         if err != nil {
 530                 return "", fmt.Errorf("Cannot open %s : %s", cmdFile, err.Error())
 531         }
 532         defer cFd.Close()
 533
 534         var lines []string
 535         scanner := bufio.NewScanner(cFd)
 536         for scanner.Scan() {
 537                 lines = append(lines, scanner.Text())
 538         }
 539         if err = scanner.Err(); err != nil {
 540                 return "", fmt.Errorf("Cannot parse %s : %s", cmdFile, err.Error())
 541         }
 542
 543         envFile, err := ioutil.TempFile("", "xds-gdb_env.ini")
 544         if err != nil {
 545                 return "", fmt.Errorf("Error while creating temporary env file: %s", err.Error())
 546         }
 547         envFileName := envFile.Name()
 548         defer envFile.Close()
 549
 550         envFound := false
 551         for _, ln := range lines {
 552                 ln = strings.TrimSpace(ln)
 553                 if strings.HasPrefix(ln, "#") && strings.Contains(ln, ":XDS-ENV:") {
 554                         env := strings.SplitAfterN(ln, ":XDS-ENV:", 2)
 555                         if len(env) == 2 {
 556                                 envFound = true
 557                                 if _, err := envFile.WriteString(strings.TrimSpace(env[1]) + "\n"); err != nil {
 558                                         return "", fmt.Errorf("Error write into temporary env file: %s", err.Error())
 559                                 }
 560                         } else {
 561                                 log.Warnf("Error while decoding line %s", ln)
 562                         }
 563                 }
 564         }
 565
 566         if !envFound {
 567                 ff := envFileName
 568                 defer os.Remove(ff)
 569                 envFileName = ""
 570
 571         }
 572
 573         return envFileName, nil
 574 }
 575
 576 func logEarly(format string, a ...interface{}) {
 577         earlyLog = append(earlyLog, fmt.Sprintf(format, a...))
 578 }