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authorSebastien Douheret <sebastien.douheret@iot.bzh>2017-08-07 08:49:25 +0200
committerSebastien Douheret <sebastien.douheret@iot.bzh>2017-08-07 18:01:35 +0200
commit60974e66c57cacdc2483d74718c4bb0a993d2183 (patch)
tree2722369e9cf2c7a3fb499011030fc4718f31e30f /main.go
Initial commitv0.0.1
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>
Diffstat (limited to 'main.go')
-rw-r--r--main.go578
1 files changed, 578 insertions, 0 deletions
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..01b46c9
--- /dev/null
+++ b/main.go
@@ -0,0 +1,578 @@
+// xds-gdb: a wrapper on gdb tool for X(cross) Development System.
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "io/ioutil"
+ "os"
+ "os/signal"
+ "os/user"
+ "syscall"
+ "time"
+
+ "strings"
+
+ "path"
+
+ "github.com/Sirupsen/logrus"
+ "github.com/codegangsta/cli"
+ common "github.com/iotbzh/xds-common/golib"
+ "github.com/joho/godotenv"
+)
+
+var appAuthors = []cli.Author{
+ cli.Author{Name: "Sebastien Douheret", Email: "sebastien@iot.bzh"},
+}
+
+// AppName name of this application
+var AppName = "xds-gdb"
+
+// AppVersion Version of this application
+// (set by Makefile)
+var AppVersion = "?.?.?"
+
+// AppSubVersion is the git tag id added to version string
+// Should be set by compilation -ldflags "-X main.AppSubVersion=xxx"
+// (set by Makefile)
+var AppSubVersion = "unknown-dev"
+
+// Create logger
+var log = logrus.New()
+var earlyLog = []string{}
+
+// Application details
+const (
+ appCopyright = "Apache-2.0"
+ defaultLogLevel = "warning"
+)
+
+// Exit events
+type exitResult struct {
+ error error
+ code int
+}
+
+// EnvVar - Environment variables used by application
+type EnvVar struct {
+ Name string
+ Usage string
+ Destination *string
+}
+
+// exitError terminates this program with the specified error
+func exitError(code syscall.Errno, f string, a ...interface{}) {
+ err := fmt.Sprintf(f, a...)
+ fmt.Fprintf(os.Stderr, err+"\n")
+ os.Exit(int(code))
+}
+
+// main
+func main() {
+ var uri, prjID, rPath, logLevel, logFile, sdkid, confFile, gdbNative string
+ var listProject bool
+ var err error
+
+ uri = "localhost:8000"
+ logLevel = defaultLogLevel
+
+ // Create a new App instance
+ app := cli.NewApp()
+ app.Name = AppName
+ app.Usage = "wrapper on gdb for X(cross) Development System."
+ app.Version = AppVersion + " (" + AppSubVersion + ")"
+ app.Authors = appAuthors
+ app.Copyright = appCopyright
+ app.Metadata = make(map[string]interface{})
+ app.Metadata["version"] = AppVersion
+ app.Metadata["git-tag"] = AppSubVersion
+ app.Metadata["logger"] = log
+
+ app.Flags = []cli.Flag{
+ cli.BoolFlag{
+ Name: "list, ls",
+ Usage: "list existing xds projects",
+ Destination: &listProject,
+ },
+ }
+
+ appEnvVars := []EnvVar{
+ EnvVar{
+ Name: "XDS_CONFIG",
+ Usage: "env config file to source on startup",
+ Destination: &confFile,
+ },
+ EnvVar{
+ Name: "XDS_LOGLEVEL",
+ Usage: "logging level (supported levels: panic, fatal, error, warn, info, debug)",
+ Destination: &logLevel,
+ },
+ EnvVar{
+ Name: "XDS_LOGFILE",
+ Usage: "logging file",
+ Destination: &logFile,
+ },
+ EnvVar{
+ Name: "XDS_NATIVE_GDB",
+ Usage: "use native gdb instead of remote XDS server",
+ Destination: &gdbNative,
+ },
+ EnvVar{
+ Name: "XDS_PROJECT_ID",
+ Usage: "project ID you want to build (mandatory variable)",
+ Destination: &prjID,
+ },
+ EnvVar{
+ Name: "XDS_RPATH",
+ Usage: "relative path into project",
+ Destination: &rPath,
+ },
+ EnvVar{
+ Name: "XDS_SDK_ID",
+ Usage: "Cross Sdk ID to use to build project",
+ Destination: &sdkid,
+ },
+ EnvVar{
+ Name: "XDS_SERVER_URL",
+ Usage: "remote XDS server url",
+ Destination: &uri,
+ },
+ }
+
+ // Process gdb arguments
+ args := make([]string, len(os.Args))
+ args[0] = os.Args[0]
+ gdbArgs := make([]string, len(os.Args))
+
+ // Split xds-xxx options from gdb options
+ copy(gdbArgs, os.Args[1:])
+ for idx, a := range os.Args[1:] {
+ // Specific case to print help or version of xds-gdb
+ switch a {
+ case "--help", "-h", "--version", "-v":
+ args[1] = a
+ goto endloop
+ case "--":
+ // Detect skip option (IOW '--') to split arguments
+ copy(args, os.Args[0:idx+1])
+ copy(gdbArgs, os.Args[idx+2:])
+ goto endloop
+ }
+ }
+endloop:
+
+ // Parse gdb arguments to detect:
+ // --tty option: used for inferior/ tty of debugged program
+ // -x/--command option: XDS env vars may be set within gdb command file
+ clientPty := ""
+ gdbCmdFile := ""
+ for idx, a := range gdbArgs {
+ switch {
+ case strings.HasPrefix(a, "--tty="):
+ clientPty = a[len("--tty="):]
+ gdbArgs[idx] = ""
+
+ case a == "--tty":
+ case strings.HasPrefix(a, "-tty"):
+ clientPty = gdbArgs[idx+1]
+ gdbArgs[idx] = ""
+ gdbArgs[idx+1] = ""
+
+ case strings.HasPrefix(a, "--command="):
+ gdbCmdFile = a[len("--command="):]
+
+ case a == "--command":
+ case strings.HasPrefix(a, "-x"):
+ gdbCmdFile = gdbArgs[idx+1]
+ }
+ }
+
+ // Source config env file
+ // (we cannot use confFile var because env variables setting is just after)
+ envMap, confFile, err := loadConfigEnvFile(os.Getenv("XDS_CONFIG"), gdbCmdFile)
+ if err != nil {
+ exitError(syscall.ENOENT, err.Error())
+ }
+
+ // Managed env vars and create help
+ dynDesc := "\nENVIRONMENT VARIABLES:"
+ for _, ev := range appEnvVars {
+ dynDesc += fmt.Sprintf("\n %s \t\t %s", ev.Name, ev.Usage)
+ if evVal, evExist := os.LookupEnv(ev.Name); evExist && ev.Destination != nil {
+ *ev.Destination = evVal
+ }
+ }
+ app.Description = "gdb wrapper for X(cross) Development System\n"
+ app.Description += "\n"
+ app.Description += " Two debugging models are supported:\n"
+ app.Description += " - xds remote debugging requiring an XDS server and allowing cross debug\n"
+ app.Description += " - native debugging\n"
+ app.Description += " By default xds remote debug is used and you need to define XDS_NATIVE_GDB to\n"
+ app.Description += " use native gdb debug mode instead.\n"
+ app.Description += "\n"
+ app.Description += " xds-gdb configuration (see variables list below) can be set using:\n"
+ app.Description += " - a config file (XDS_CONFIG)\n"
+ app.Description += " - or environment variables\n"
+ app.Description += " - or by setting variables within gdb ini file (commented line including :XDS-ENV: tag)\n"
+ app.Description += " Example of gdb ini file where we define project and sdk ID:\n"
+ app.Description += " # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject\n"
+ app.Description += " # :XDS-ENV: XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot\n"
+ app.Description += "\n"
+ app.Description += dynDesc + "\n"
+
+ // only one action
+ app.Action = func(ctx *cli.Context) error {
+ var err error
+ curDir, _ := os.Getwd()
+
+ // Set logger level, formatter and log file
+ if log.Level, err = logrus.ParseLevel(logLevel); err != nil {
+ msg := fmt.Sprintf("Invalid log level : \"%v\"\n", logLevel)
+ return cli.NewExitError(msg, int(syscall.EINVAL))
+ }
+ log.Formatter = &logrus.TextFormatter{}
+
+ // Always log into a file
+ if logFile == "" {
+ logFile = "/tmp/xds-gdb.log"
+ }
+ fdL, err := os.OpenFile(logFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
+ if err != nil {
+ msgErr := fmt.Sprintf("Cannot create log file %s", logFile)
+ return cli.NewExitError(msgErr, int(syscall.EPERM))
+ }
+ log.Out = fdL
+
+ // Build env variables
+ env := []string{}
+ for k, v := range envMap {
+ env = append(env, k+"="+v)
+ }
+
+ // Create cross or native gdb interface
+ var gdb IGDB
+ if gdbNative != "" {
+ gdb = NewGdbNative(log, gdbArgs, env)
+ } else {
+ gdb = NewGdbXds(log, gdbArgs, env)
+ gdb.SetConfig("uri", uri)
+ gdb.SetConfig("prjID", prjID)
+ gdb.SetConfig("sdkID", sdkid)
+ gdb.SetConfig("rPath", rPath)
+ gdb.SetConfig("listProject", listProject)
+ }
+
+ // Log early print
+ for _, msg := range earlyLog {
+ log.Debugf(msg)
+ }
+
+ // Log useful info
+ log.Infof("Original arguments: %v", os.Args)
+ log.Infof("Current directory : %v", curDir)
+ log.Infof("Use confFile : '%s'", confFile)
+ log.Infof("Execute : /exec %v %v", gdb.Cmd(), gdb.Args())
+
+ // Properly report invalid init file error
+ gdbCommandFileError := ""
+ for i, a := range gdbArgs {
+ if a == "-x" {
+ gdbCommandFileError = gdbArgs[i+1] + ": No such file or directory."
+ break
+ } else if strings.HasPrefix(a, "--command=") {
+ gdbCommandFileError = strings.TrimLeft(a, "--command=") + ": No such file or directory."
+ break
+ }
+ }
+ log.Infof("Add detection of error: <%s>", gdbCommandFileError)
+
+ // Init gdb subprocess management
+ if code, err := gdb.Init(); err != nil {
+ return cli.NewExitError(err.Error(), code)
+ }
+
+ exitChan := make(chan exitResult, 1)
+
+ gdb.OnError(func(err error) {
+ fmt.Println("ERROR: ", err.Error())
+ })
+
+ gdb.OnDisconnect(func(err error) {
+ fmt.Println("Disconnection: ", err.Error())
+ exitChan <- exitResult{err, int(syscall.ESHUTDOWN)}
+ })
+
+ gdb.Read(func(timestamp, stdout, stderr string) {
+ if stdout != "" {
+ fmt.Printf("%s", stdout)
+ log.Debugf("Recv OUT: <%s>", stdout)
+ }
+ if stderr != "" {
+ fmt.Fprintf(os.Stderr, "%s", stderr)
+ log.Debugf("Recv ERR: <%s>", stderr)
+ }
+
+ // Correctly report error about init file
+ if gdbCommandFileError != "" && strings.Contains(stdout, gdbCommandFileError) {
+ fmt.Fprintf(os.Stderr, "ERROR: "+gdbCommandFileError)
+ log.Errorf("ERROR: " + gdbCommandFileError)
+ if err := gdb.SendSignal(syscall.SIGTERM); err != nil {
+ log.Errorf("Error while sending signal: %s", err.Error())
+ }
+ exitChan <- exitResult{err, int(syscall.ENOENT)}
+ }
+ })
+
+ gdb.OnExit(func(code int, err error) {
+ exitChan <- exitResult{err, code}
+ })
+
+ // Handle client tty / pts
+ if clientPty != "" {
+ log.Infoln("Client tty detected: %v\n", clientPty)
+
+ cpFd, err := os.OpenFile(clientPty, os.O_RDWR, 0)
+ if err != nil {
+ return cli.NewExitError(err.Error(), int(syscall.EPERM))
+ }
+ defer cpFd.Close()
+
+ // client tty stdin
+ /* XXX TODO - implement stdin to send data to debugged program
+ go func() {
+ reader := bufio.NewReader(cpFd)
+ sc := bufio.NewScanner(reader)
+ for sc.Scan() {
+ data := sc.Text()
+ iosk.Emit(apiv1.ExecInferiorInEvent, data+"\n")
+ log.Debugf("Inferior IN: <%v>", data)
+ }
+ if sc.Err() != nil {
+ log.Warnf("Inferior Stdin scanner exit, close stdin (err=%v)", sc.Err())
+ }
+ }()
+ */
+
+ // client tty stdout
+ gdb.InferiorRead(func(timestamp, stdout, stderr string) {
+ if stdout != "" {
+ fmt.Fprintf(cpFd, "%s", stdout)
+ log.Debugf("Inferior OUT: <%s>", stdout)
+ }
+ if stderr != "" {
+ fmt.Fprintf(cpFd, "%s", stderr)
+ log.Debugf("Inferior ERR: <%s>", stderr)
+ }
+ })
+ }
+
+ // Allow to overwrite some gdb commands
+ var overwriteMap = make(map[string]string)
+ if overEnv, exist := os.LookupEnv("XDS_OVERWRITE_COMMANDS"); exist {
+ overEnvS := strings.TrimSpace(overEnv)
+ if len(overEnvS) > 0 {
+ // Extract overwrite commands from env variable
+ for _, def := range strings.Split(overEnvS, ",") {
+ if kv := strings.Split(def, ":"); len(kv) == 2 {
+ overwriteMap[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
+ } else {
+ return cli.NewExitError(
+ fmt.Errorf("Invalid definition in XDS_OVERWRITE_COMMANDS (%s)", def),
+ int(syscall.EINVAL))
+ }
+ }
+ }
+ } else {
+ overwriteMap["-exec-run"] = "-exec-continue"
+ overwriteMap["-file-exec-and-symbols"] = "-file-exec-file"
+ }
+ log.Debugf("overwriteMap = %v", overwriteMap)
+
+ // Send stdin though WS
+ go func() {
+ paranoia := 600
+ reader := bufio.NewReader(os.Stdin)
+
+ for {
+ sc := bufio.NewScanner(reader)
+ for sc.Scan() {
+ command := sc.Text()
+
+ // overwrite some commands
+ for key, value := range overwriteMap {
+ if strings.Contains(command, key) {
+ command = strings.Replace(command, key, value, 1)
+ log.Debugf("OVERWRITE %s -> %s", key, value)
+ }
+ }
+ gdb.Write(command + "\n")
+ log.Debugf("Send: <%v>", command)
+ }
+ log.Infof("Stdin scanner exit, close stdin (err=%v)", sc.Err())
+
+ // CTRL-D exited scanner, so send it explicitly
+ gdb.Write("\x04")
+ time.Sleep(time.Millisecond * 100)
+
+ if paranoia--; paranoia <= 0 {
+ msg := "Abnormal loop detected on stdin"
+ log.Errorf("Abnormal loop detected on stdin")
+ gdb.SendSignal(syscall.SIGTERM)
+ exitChan <- exitResult{fmt.Errorf(msg), int(syscall.ELOOP)}
+ }
+ }
+ }()
+
+ // Handling all Signals
+ sigs := make(chan os.Signal, 1)
+ signal.Notify(sigs)
+
+ go func() {
+ for {
+ sig := <-sigs
+ if err := gdb.SendSignal(sig); err != nil {
+ log.Errorf("Error while sending signal: %s", err.Error())
+ }
+ }
+ }()
+
+ // Start gdb
+ if code, err := gdb.Start(clientPty != ""); err != nil {
+ return cli.NewExitError(err.Error(), code)
+ }
+
+ // Wait exit
+ select {
+ case res := <-exitChan:
+ errStr := ""
+ if res.code == 0 {
+ log.Infoln("Exit successfully")
+ }
+ if res.error != nil {
+ log.Infoln("Exit with ERROR: ", res.error.Error())
+ errStr = res.error.Error()
+ }
+ return cli.NewExitError(errStr, res.code)
+ }
+ }
+
+ app.Run(args)
+}
+
+// loadConfigEnvFile
+func loadConfigEnvFile(confFile, gdbCmdFile string) (map[string]string, string, error) {
+ var err error
+ envMap := make(map[string]string)
+
+ // 1- if no confFile set, use setting from gdb command file is option
+ // --command/-x is set
+ if confFile == "" && gdbCmdFile != "" {
+ logEarly("Try extract config from gdbCmdFile: %s", gdbCmdFile)
+ confFile, err = extractEnvFromCmdFile(gdbCmdFile)
+ if confFile != "" {
+ defer os.Remove(confFile)
+ }
+ if err != nil {
+ return envMap, confFile, fmt.Errorf(err.Error())
+ }
+ }
+ // 2- search xds-gdb.env file in various locations
+ if confFile == "" {
+ curDir, _ := os.Getwd()
+ if u, err := user.Current(); err == nil {
+ xdsEnvFile := "xds-gdb.env"
+ for _, d := range []string{
+ path.Join(curDir),
+ path.Join(curDir, "..", ".."),
+ path.Join(curDir, "../../target"),
+ path.Join(u.HomeDir, ".xds"),
+ } {
+ confFile := path.Join(d, xdsEnvFile)
+ logEarly("Search config in %s", confFile)
+ if common.Exists(confFile) {
+ break
+ }
+ }
+ }
+ }
+
+ if confFile == "" {
+ return envMap, "", nil
+ }
+
+ if !common.Exists(confFile) {
+ return envMap, confFile, fmt.Errorf("Error no env config file not found")
+ }
+ if err = godotenv.Load(confFile); err != nil {
+ return envMap, confFile, fmt.Errorf("Error loading env config file " + confFile)
+ }
+ if envMap, err = godotenv.Read(confFile); err != nil {
+ return envMap, confFile, fmt.Errorf("Error reading env config file " + confFile)
+ }
+ return envMap, confFile, nil
+}
+
+/*
+ extractEnvFromCmdFile: extract xds-gdb env variable from gdb command file
+ All commented lines (#) in gdb command file that start with ':XDS-ENV:' prefix
+ will be considered as XDS env commands. For example the 3 syntaxes below
+ are supported:
+ # :XDS-ENV: XDS_PROJECT_ID=IW7B4EE-DBY4Z74_myProject
+ #:XDS-ENV:XDS_SDK_ID=poky-agl_aarch64_3.99.1+snapshot
+ # :XDS-ENV: export XDS_SERVER_URL=localhost:8800
+*/
+func extractEnvFromCmdFile(cmdFile string) (string, error) {
+ if !common.Exists(cmdFile) {
+ return "", nil
+ }
+ cFd, err := os.Open(cmdFile)
+ if err != nil {
+ return "", fmt.Errorf("Cannot open %s : %s", cmdFile, err.Error())
+ }
+ defer cFd.Close()
+
+ var lines []string
+ scanner := bufio.NewScanner(cFd)
+ for scanner.Scan() {
+ lines = append(lines, scanner.Text())
+ }
+ if err = scanner.Err(); err != nil {
+ return "", fmt.Errorf("Cannot parse %s : %s", cmdFile, err.Error())
+ }
+
+ envFile, err := ioutil.TempFile("", "xds-gdb_env.ini")
+ if err != nil {
+ return "", fmt.Errorf("Error while creating temporary env file: %s", err.Error())
+ }
+ envFileName := envFile.Name()
+ defer envFile.Close()
+
+ envFound := false
+ for _, ln := range lines {
+ ln = strings.TrimSpace(ln)
+ if strings.HasPrefix(ln, "#") && strings.Contains(ln, ":XDS-ENV:") {
+ env := strings.SplitAfterN(ln, ":XDS-ENV:", 2)
+ if len(env) == 2 {
+ envFound = true
+ if _, err := envFile.WriteString(strings.TrimSpace(env[1]) + "\n"); err != nil {
+ return "", fmt.Errorf("Error write into temporary env file: %s", err.Error())
+ }
+ } else {
+ log.Warnf("Error while decoding line %s", ln)
+ }
+ }
+ }
+
+ if !envFound {
+ ff := envFileName
+ defer os.Remove(ff)
+ envFileName = ""
+
+ }
+
+ return envFileName, nil
+}
+
+func logEarly(format string, a ...interface{}) {
+ earlyLog = append(earlyLog, fmt.Sprintf(format, a...))
+}