main.go

   1 /*
   2  * Copyright (C) 2017 "IoT.bzh"
   3  * Author Sebastien Douheret <sebastien@iot.bzh>
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *   http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  *
  18  * xds-gdb: a wrapper on gdb tool for X(cross) Development System.
  19  */
  20
  21 package main
  22
  23 import (
  24         "bufio"
  25         "fmt"
  26         "io/ioutil"
  27         "os"
  28         "os/signal"
  29         "os/user"
  30         "syscall"
  31         "time"
  32
  33         "strings"
  34
  35         "path"
  36
  37         "github.com/Sirupsen/logrus"
  38         "github.com/codegangsta/cli"
  39         common "github.com/iotbzh/xds-common/golib"
  40         "github.com/joho/godotenv"
  41 )
  42
  43 var appAuthors = []cli.Author{
  44         cli.Author{Name: "Sebastien Douheret", Email: "sebastien@iot.bzh"},
  45 }
  46
  47 // AppName name of this application
  48 var AppName = "xds-gdb"
  49
  50 // AppVersion Version of this application
  51 // (set by Makefile)
  52 var AppVersion = "?.?.?"
  53
  54 // AppSubVersion is the git tag id added to version string
  55 // Should be set by compilation -ldflags "-X main.AppSubVersion=xxx"
  56 // (set by Makefile)
  57 var AppSubVersion = "unknown-dev"
  58
  59 // Create logger
  60 var log = logrus.New()
  61 var logFileInitial = "/tmp/xds-gdb.log"
  62
  63 // Application details
  64 const (
  65         appCopyright    = "Copyright (C) 2017 IoT.bzh - Apache-2.0"
  66         defaultLogLevel = "warning"
  67 )
  68
  69 // Exit events
  70 type exitResult struct {
  71         error error
  72         code  int
  73 }
  74
  75 // EnvVar - Environment variables used by application
  76 type EnvVar struct {
  77         Name        string
  78         Usage       string
  79         Destination *string
  80 }
  81
  82 // exitError terminates this program with the specified error
  83 func exitError(code syscall.Errno, f string, a ...interface{}) {
  84         err := fmt.Sprintf(f, a...)
  85         fmt.Fprintf(os.Stderr, err+"\n")
  86         log.Debugf("Exit: code=%v, err=%s", code, err)
  87
  88         os.Exit(int(code))
  89 }
  90
  91 // main
  92 func main() {
  93         var uri, prjID, rPath, logLevel, logFile, sdkid, confFile, gdbNative string
  94         var listProject bool
  95         var err error
  96
  97         // Init Logger and set temporary file and level for the 1st part
  98         // IOW while XDS_LOGLEVEL and XDS_LOGFILE options are not parsed
  99         logFile = logFileInitial
 100         fdL, err := os.OpenFile(logFileInitial, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
 101         if err != nil {
 102                 msgErr := fmt.Sprintf("Cannot create log file %s", logFileInitial)
 103                 exitError(syscall.EPERM, msgErr)
 104         }
 105         log.Formatter = &logrus.TextFormatter{}
 106         log.Out = fdL
 107         log.Level = logrus.DebugLevel
 108
 109         uri = "localhost:8000"
 110         logLevel = defaultLogLevel
 111
 112         // Create a new App instance
 113         app := cli.NewApp()
 114         app.Name = AppName
 115         app.Usage = "wrapper on gdb for X(cross) Development System."
 116         app.Version = AppVersion + " (" + AppSubVersion + ")"
 117         app.Authors = appAuthors
 118         app.Copyright = appCopyright
 119         app.Metadata = make(map[string]interface{})
 120         app.Metadata["version"] = AppVersion
 121         app.Metadata["git-tag"] = AppSubVersion
 122         app.Metadata["logger"] = log
 123
 124         app.Flags = []cli.Flag{
 125                 cli.BoolFlag{
 126                         Name:        "list, ls",
 127                         Usage:       "list existing xds projects",
 128                         Destination: &listProject,
 129                 },
 130         }
 131
 132         appEnvVars := []EnvVar{
 133                 EnvVar{
 134                         Name:        "XDS_CONFIG",
 135                         Usage:       "env config file to source on startup",
 136                         Destination: &confFile,
 137                 },
 138                 EnvVar{
 139                         Name:        "XDS_LOGLEVEL",
 140                         Usage:       "logging level (supported levels: panic, fatal, error, warn, info, debug)",
 141                         Destination: &logLevel,
 142                 },
 143                 EnvVar{
 144                         Name:        "XDS_LOGFILE",
 145                         Usage:       "logging file (default: " + logFileInitial + ")",
 146                         Destination: &logFile,
 147                 },
 148                 EnvVar{
 149                         Name:        "XDS_NATIVE_GDB",
 150                         Usage:       "use native gdb instead of remote XDS server",
 151                         Destination: &gdbNative,
 152                 },
 153                 EnvVar{
 154                         Name:        "XDS_PROJECT_ID",
 155                         Usage:       "project ID you want to build (mandatory variable)",
 156                         Destination: &prjID,
 157                 },
 158                 EnvVar{
 159                         Name:        "XDS_RPATH",
 160                         Usage:       "relative path into project",
 161                         Destination: &rPath,
 162                 },
 163                 EnvVar{
 164                         Name:        "XDS_SDK_ID",
 165                         Usage:       "Cross Sdk ID to use to build project",
 166                         Destination: &sdkid,
 167                 },
 168                 EnvVar{
 169                         Name:        "XDS_SERVER_URL",
 170                         Usage:       "remote XDS server url",
 171                         Destination: &uri,
 172                 },
 173         }
 174
 175         // Process gdb arguments
 176         log.Debugf("xds-gdb started with args: %v", os.Args)
 177         args := make([]string, len(os.Args))
 178         args[0] = os.Args[0]
 179         gdbArgs := make([]string, len(os.Args))
 180
 181         // Split xds-xxx options from gdb options
 182         copy(gdbArgs, os.Args[1:])
 183         for idx, a := range os.Args[1:] {
 184                 // Specific case to print help or version of xds-gdb
 185                 switch a {
 186                 case "--help", "-h", "--version", "-v", "--list", "-ls":
 187                         args[1] = a
 188                         goto endloop
 189                 case "--":
 190                         // Detect skip option (IOW '--') to split arguments
 191                         copy(args, os.Args[0:idx+1])
 192                         copy(gdbArgs, os.Args[idx+2:])
 193                         goto endloop
 194                 }
 195         }
 196 endloop:
 197
 198         // Parse gdb arguments to detect:
 199         //  --tty option: used for inferior/ tty of debugged program
 200         //  -x/--command option: XDS env vars may be set within gdb command file
 201         clientPty := ""
 202         gdbCmdFile := ""
 203         for idx, a := range gdbArgs {
 204                 switch {
 205                 case strings.HasPrefix(a, "--tty="):
 206                         clientPty = a[len("--tty="):]
 207                         gdbArgs[idx] = ""
 208
 209                 case a == "--tty":
 210                 case strings.HasPrefix(a, "-tty"):
 211                         clientPty = gdbArgs[idx+1]
 212                         gdbArgs[idx] = ""
 213                         gdbArgs[idx+1] = ""
 214
 215                 case strings.HasPrefix(a, "--command="):
 216                         gdbCmdFile = a[len("--command="):]
 217
 218                 case a == "--command":
 219                 case strings.HasPrefix(a, "-x"):
 220                         gdbCmdFile = gdbArgs[idx+1]
 221                 }
 222         }
 223
 224         // Source config env file
 225         // (we cannot use confFile var because env variables setting is just after)
 226         envMap, confFile, err := loadConfigEnvFile(os.Getenv("XDS_CONFIG"), gdbCmdFile)
 227         log.Infof("Load env config: envMap=%v, confFile=%v, err=%v", envMap, confFile, err)
 228
 229         // Only rise an error when args is not set (IOW when --help or --version is not set)
 230         if len(args) == 1 {
 231                 if err != nil {
 232                         exitError(syscall.ENOENT, err.Error())
 233                 }
 234         }
 235
 236         // Managed env vars and create help
 237         dynDesc := "\nENVIRONMENT VARIABLES:"
 238         for _, ev := range appEnvVars {
 239                 dynDesc += fmt.Sprintf("\n %s \t\t %s", ev.Name, ev.Usage)
 240                 if evVal, evExist := os.LookupEnv(ev.Name); evExist && ev.Destination != nil {
 241                         *ev.Destination = evVal
 242                 }
 243         }
 244         app.Description = "gdb wrapper for X(cross) Development System\n"
 245         app.Description += "\n"
 246         app.Description += " Two debugging models are supported:\n"
 247         app.Description += "  - xds remote debugging requiring an XDS server and allowing cross debug\n"
 248         app.Description += "  - native debugging\n"
 249         app.Description += " By default xds remote debug is used and you need to define XDS_NATIVE_GDB to\n"
 250         app.Description += " use native gdb debug mode instead.\n"
 251         app.Description += "\n"
 252         app.Description += " xds-gdb configuration (see variables list below) can be set using:\n"
 253         app.Description += "  - a config file (XDS_CONFIG)\n"
 254         app.Description += "  - or environment variables\n"
 255         app.Description += "  - or by setting variables within gdb ini file (commented line including :XDS-ENV: tag)\n"
 256         app.Description += "    Example of gdb ini file where we define project and sdk ID:\n"
 257         app.Description += "     # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject\n"
 258         app.Description += "     # :XDS-ENV: XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot\n"
 259         app.Description += "\n"
 260         app.Description += dynDesc + "\n"
 261
 262         // only one action
 263         app.Action = func(ctx *cli.Context) error {
 264                 var err error
 265                 curDir, _ := os.Getwd()
 266
 267                 // Build env variables
 268                 env := []string{}
 269                 for k, v := range envMap {
 270                         env = append(env, k+"="+v)
 271                 }
 272
 273                 // Now set logger level and log file to correct/env var settings
 274                 if log.Level, err = logrus.ParseLevel(logLevel); err != nil {
 275                         msg := fmt.Sprintf("Invalid log level : \"%v\"\n", logLevel)
 276                         return cli.NewExitError(msg, int(syscall.EINVAL))
 277                 }
 278                 log.Infof("Switch log level to %s", logLevel)
 279
 280                 if logFile != logFileInitial {
 281                         log.Infof("Switch logging to log file %s", logFile)
 282
 283                         fdL, err := os.OpenFile(logFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
 284                         if err != nil {
 285                                 msgErr := fmt.Sprintf("Cannot create log file %s", logFile)
 286                                 return cli.NewExitError(msgErr, int(syscall.EPERM))
 287                         }
 288                         defer fdL.Close()
 289                         log.Out = fdL
 290                 }
 291
 292                 // Create cross or native gdb interface
 293                 var gdb IGDB
 294                 if gdbNative != "" {
 295                         gdb = NewGdbNative(log, gdbArgs, env)
 296                 } else {
 297                         gdb = NewGdbXds(log, gdbArgs, env)
 298                         gdb.SetConfig("uri", uri)
 299                         gdb.SetConfig("prjID", prjID)
 300                         gdb.SetConfig("sdkID", sdkid)
 301                         gdb.SetConfig("rPath", rPath)
 302                         gdb.SetConfig("listProject", listProject)
 303                 }
 304
 305                 // Log useful info
 306                 log.Infof("Original arguments: %v", os.Args)
 307                 log.Infof("Current directory : %v", curDir)
 308                 log.Infof("Use confFile      : '%s'", confFile)
 309                 log.Infof("Execute           : /exec %v %v", gdb.Cmd(), gdb.Args())
 310
 311                 // Properly report invalid init file error
 312                 gdbCommandFileError := ""
 313                 for i, a := range gdbArgs {
 314                         if a == "-x" {
 315                                 gdbCommandFileError = gdbArgs[i+1] + ": No such file or directory."
 316                                 break
 317                         } else if strings.HasPrefix(a, "--command=") {
 318                                 gdbCommandFileError = strings.TrimLeft(a, "--command=") + ": No such file or directory."
 319                                 break
 320                         }
 321                 }
 322                 log.Infof("Add detection of error: <%s>", gdbCommandFileError)
 323
 324                 // Init gdb subprocess management
 325                 if code, err := gdb.Init(); err != nil {
 326                         return cli.NewExitError(err.Error(), code)
 327                 }
 328
 329                 exitChan := make(chan exitResult, 1)
 330
 331                 gdb.OnError(func(err error) {
 332                         fmt.Println("ERROR: ", err.Error())
 333                 })
 334
 335                 gdb.OnDisconnect(func(err error) {
 336                         fmt.Println("Disconnection: ", err.Error())
 337                         exitChan <- exitResult{err, int(syscall.ESHUTDOWN)}
 338                 })
 339
 340                 gdb.Read(func(timestamp, stdout, stderr string) {
 341                         if stdout != "" {
 342                                 fmt.Printf("%s", stdout)
 343                                 log.Debugf("Recv OUT: <%s>", stdout)
 344                         }
 345                         if stderr != "" {
 346                                 fmt.Fprintf(os.Stderr, "%s", stderr)
 347                                 log.Debugf("Recv ERR: <%s>", stderr)
 348                         }
 349
 350                         // Correctly report error about init file
 351                         if gdbCommandFileError != "" && strings.Contains(stdout, gdbCommandFileError) {
 352                                 fmt.Fprintf(os.Stderr, "ERROR: "+gdbCommandFileError)
 353                                 log.Errorf("ERROR: " + gdbCommandFileError)
 354                                 if err := gdb.SendSignal(syscall.SIGTERM); err != nil {
 355                                         log.Errorf("Error while sending signal: %s", err.Error())
 356                                 }
 357                                 exitChan <- exitResult{err, int(syscall.ENOENT)}
 358                         }
 359                 })
 360
 361                 gdb.OnExit(func(code int, err error) {
 362                         exitChan <- exitResult{err, code}
 363                 })
 364
 365                 // Handle client tty / pts
 366                 if clientPty != "" {
 367                         log.Infoln("Client tty detected: %v", clientPty)
 368
 369                         cpFd, err := os.OpenFile(clientPty, os.O_RDWR, 0)
 370                         if err != nil {
 371                                 return cli.NewExitError(err.Error(), int(syscall.EPERM))
 372                         }
 373                         defer cpFd.Close()
 374
 375                         // client tty stdin
 376                         /* XXX TODO - implement stdin to send data to debugged program
 377                         go func() {
 378                                 reader := bufio.NewReader(cpFd)
 379                                 sc := bufio.NewScanner(reader)
 380                                 for sc.Scan() {
 381                                         data := sc.Text()
 382                                         iosk.Emit(xaapiv1.ExecInferiorInEvent, data+"\n")
 383                                         log.Debugf("Inferior IN: <%v>", data)
 384                                 }
 385                                 if sc.Err() != nil {
 386                                         log.Warnf("Inferior Stdin scanner exit, close stdin (err=%v)", sc.Err())
 387                                 }
 388                         }()
 389                         */
 390
 391                         // client tty stdout
 392                         gdb.InferiorRead(func(timestamp, stdout, stderr string) {
 393                                 if stdout != "" {
 394                                         fmt.Fprintf(cpFd, "%s", stdout)
 395                                         log.Debugf("Inferior OUT: <%s>", stdout)
 396                                 }
 397                                 if stderr != "" {
 398                                         fmt.Fprintf(cpFd, "%s", stderr)
 399                                         log.Debugf("Inferior ERR: <%s>", stderr)
 400                                 }
 401                         })
 402                 }
 403
 404                 // Allow to overwrite some gdb commands
 405                 var overwriteMap = make(map[string]string)
 406                 if overEnv, exist := os.LookupEnv("XDS_OVERWRITE_COMMANDS"); exist {
 407                         overEnvS := strings.TrimSpace(overEnv)
 408                         if len(overEnvS) > 0 {
 409                                 // Extract overwrite commands from env variable
 410                                 for _, def := range strings.Split(overEnvS, ",") {
 411                                         if kv := strings.Split(def, ":"); len(kv) == 2 {
 412                                                 overwriteMap[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
 413                                         } else {
 414                                                 return cli.NewExitError(
 415                                                         fmt.Errorf("Invalid definition in XDS_OVERWRITE_COMMANDS (%s)", def),
 416                                                         int(syscall.EINVAL))
 417                                         }
 418                                 }
 419                         }
 420                 } else {
 421                         overwriteMap["-exec-run"] = "-exec-continue"
 422                         overwriteMap["-file-exec-and-symbols"] = "-file-exec-file"
 423                 }
 424                 log.Debugf("overwriteMap = %v", overwriteMap)
 425
 426                 // Send stdin though WS
 427                 go func() {
 428                         paranoia := 600
 429                         reader := bufio.NewReader(os.Stdin)
 430
 431                         // Enable workaround to correctly close connection
 432                         // except if XDS_GDBSERVER_EXIT_NOFIX is defined
 433                         _, gdbExitNoFix := os.LookupEnv("XDS_GDBSERVER_EXIT_NOFIX")
 434
 435                         for {
 436                                 sc := bufio.NewScanner(reader)
 437                                 for sc.Scan() {
 438                                         command := sc.Text()
 439
 440                                         // overwrite some commands
 441                                         for key, value := range overwriteMap {
 442                                                 if strings.Contains(command, key) {
 443                                                         command = strings.Replace(command, key, value, 1)
 444                                                         log.Debugf("OVERWRITE %s -> %s", key, value)
 445                                                 }
 446                                         }
 447
 448                                         // Send SIGINT to stop debugged process execution before sending -gdb-exit command
 449                                         if !gdbExitNoFix && strings.Contains(command, "-gdb-exit") {
 450                                                 log.Infof("Detection of -gdb-exit, exiting...")
 451                                                 if err := gdb.SendSignal(syscall.SIGINT); err != nil {
 452                                                         log.Errorf("Error while sending signal SIGINT : %s", err.Error())
 453                                                 }
 454                                                 time.Sleep(time.Millisecond * 200)
 455                                         }
 456
 457                                         gdb.Write(command + "\n")
 458                                         log.Debugf("Send: <%v>", command)
 459                                 }
 460                                 log.Infof("Stdin scanner exit, close stdin (err=%v)", sc.Err())
 461
 462                                 // CTRL-D exited scanner, so send it explicitly
 463                                 gdb.Write("\x04")
 464                                 time.Sleep(time.Millisecond * 100)
 465
 466                                 if paranoia--; paranoia <= 0 {
 467                                         msg := "Abnormal loop detected on stdin"
 468                                         log.Errorf("Abnormal loop detected on stdin")
 469                                         gdb.SendSignal(syscall.SIGTERM)
 470                                         exitChan <- exitResult{fmt.Errorf(msg), int(syscall.ELOOP)}
 471                                 }
 472                         }
 473                 }()
 474
 475                 // Handling all Signals
 476                 sigs := make(chan os.Signal, 1)
 477                 signal.Notify(sigs)
 478
 479                 go func() {
 480                         for {
 481                                 sig := <-sigs
 482
 483                                 if isIgnoredSignal(sig) {
 484                                         return
 485                                 }
 486
 487                                 if err := gdb.SendSignal(sig); err != nil {
 488                                         log.Errorf("Error while sending signal %v : %s", sig, err.Error())
 489                                 }
 490                         }
 491                 }()
 492
 493                 // Start gdb
 494                 if code, err := gdb.Start(clientPty != ""); err != nil {
 495                         return cli.NewExitError(err.Error(), code)
 496                 }
 497
 498                 // Wait exit
 499                 select {
 500                 case res := <-exitChan:
 501                         errStr := ""
 502                         if res.code == 0 {
 503                                 log.Infoln("Exit successfully")
 504                         }
 505                         if res.error != nil {
 506                                 log.Infoln("Exit with ERROR: ", res.error.Error())
 507                                 errStr = res.error.Error()
 508                         }
 509                         return cli.NewExitError(errStr, res.code)
 510                 }
 511         }
 512
 513         app.Run(args)
 514 }
 515
 516 // loadConfigEnvFile
 517 func loadConfigEnvFile(confFile, gdbCmdFile string) (map[string]string, string, error) {
 518         var err error
 519         envMap := make(map[string]string)
 520
 521         // 1- if no confFile set, use setting from gdb command file is option
 522         //    --command/-x is set
 523         if confFile == "" && gdbCmdFile != "" {
 524                 log.Infof("Try extract config from gdbCmdFile: %s", gdbCmdFile)
 525                 confFile, err = extractEnvFromCmdFile(gdbCmdFile)
 526                 if confFile != "" {
 527                         defer os.Remove(confFile)
 528                 }
 529                 if err != nil {
 530                         log.Infof("Extraction from gdbCmdFile failed: %v", err.Error())
 531                 }
 532         }
 533         // 2- search xds-gdb.env file in various locations
 534         if confFile == "" {
 535                 curDir, _ := os.Getwd()
 536                 if u, err := user.Current(); err == nil {
 537                         xdsEnvFile := "xds-gdb.env"
 538                         for _, d := range []string{
 539                                 path.Join(curDir),
 540                                 path.Join(curDir, ".."),
 541                                 path.Join(curDir, "target"),
 542                                 path.Join(u.HomeDir, ".config", "xds"),
 543                         } {
 544                                 cf := path.Join(d, xdsEnvFile)
 545                                 log.Infof("Search config in %s", cf)
 546                                 if common.Exists(cf) {
 547                                         confFile = cf
 548                                         break
 549                                 }
 550                         }
 551                 }
 552         }
 553
 554         if confFile == "" {
 555                 log.Infof("NO valid conf file found!")
 556                 return envMap, "", nil
 557         }
 558
 559         if !common.Exists(confFile) {
 560                 return envMap, confFile, fmt.Errorf("Error no env config file not found")
 561         }
 562         if err = godotenv.Load(confFile); err != nil {
 563                 return envMap, confFile, fmt.Errorf("Error loading env config file " + confFile)
 564         }
 565         if envMap, err = godotenv.Read(confFile); err != nil {
 566                 return envMap, confFile, fmt.Errorf("Error reading env config file " + confFile)
 567         }
 568
 569         return envMap, confFile, nil
 570 }
 571
 572 /*
 573  extractEnvFromCmdFile: extract xds-gdb env variable from gdb command file
 574   All commented lines (#) in gdb command file that start with ':XDS-ENV:' prefix
 575   will be considered as XDS env commands. For example the 3 syntaxes below
 576   are supported:
 577   # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject
 578   #:XDS-ENV:XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot
 579   # :XDS-ENV:  export XDS_SERVER_URL=localhost:8800
 580 */
 581 func extractEnvFromCmdFile(cmdFile string) (string, error) {
 582         if !common.Exists(cmdFile) {
 583                 return "", nil
 584         }
 585         cFd, err := os.Open(cmdFile)
 586         if err != nil {
 587                 return "", fmt.Errorf("Cannot open %s : %s", cmdFile, err.Error())
 588         }
 589         defer cFd.Close()
 590
 591         var lines []string
 592         scanner := bufio.NewScanner(cFd)
 593         for scanner.Scan() {
 594                 lines = append(lines, scanner.Text())
 595         }
 596         if err = scanner.Err(); err != nil {
 597                 return "", fmt.Errorf("Cannot parse %s : %s", cmdFile, err.Error())
 598         }
 599
 600         envFile, err := ioutil.TempFile("", "xds-gdb_env.ini")
 601         if err != nil {
 602                 return "", fmt.Errorf("Error while creating temporary env file: %s", err.Error())
 603         }
 604         envFileName := envFile.Name()
 605         defer envFile.Close()
 606
 607         envFound := false
 608         for _, ln := range lines {
 609                 ln = strings.TrimSpace(ln)
 610                 if strings.HasPrefix(ln, "#") && strings.Contains(ln, ":XDS-ENV:") {
 611                         env := strings.SplitAfterN(ln, ":XDS-ENV:", 2)
 612                         if len(env) == 2 {
 613                                 envFound = true
 614                                 if _, err := envFile.WriteString(strings.TrimSpace(env[1]) + "\n"); err != nil {
 615                                         return "", fmt.Errorf("Error write into temporary env file: %s", err.Error())
 616                                 }
 617                         } else {
 618                                 log.Warnf("Error while decoding line %s", ln)
 619                         }
 620                 }
 621         }
 622
 623         if !envFound {
 624                 ff := envFileName
 625                 defer os.Remove(ff)
 626                 envFileName = ""
 627
 628         }
 629
 630         return envFileName, nil
 631 }