mcs/tools/mkbundle/mkbundle.cs

   1 //
   2 // mkbundle: tool to create bundles.
   3 //
   4 // Based on the `make-bundle' Perl script written by Paolo Molaro (lupus@debian.org)
   5 //
   6 // Author:
   7 //   Miguel de Icaza
   8 //
   9 // (C) Novell, Inc 2004
  10 //
  11 using System;
  12 using System.Diagnostics;
  13 using System.Xml;
  14 using System.Collections.Generic;
  15 using System.Reflection;
  16 using System.IO;
  17 using System.IO.Compression;
  18 using System.Runtime.InteropServices;
  19 using System.Text;
  20
  21
  22 #if NET_4_5
  23 using System.Threading.Tasks;
  24 #endif
  25
  26 class MakeBundle {
  27         static string output = "a.out";
  28         static string object_out = null;
  29         static List<string> link_paths = new List<string> ();
  30         static bool autodeps = false;
  31         static bool keeptemp = false;
  32         static bool compile_only = false;
  33         static bool static_link = false;
  34         static string config_file = null;
  35         static string machine_config_file = null;
  36         static string config_dir = null;
  37         static string style = "linux";
  38         static bool compress;
  39         static bool nomain;
  40
  41         static int Main (string [] args)
  42         {
  43                 List<string> sources = new List<string> ();
  44                 int top = args.Length;
  45                 link_paths.Add (".");
  46
  47                 DetectOS ();
  48
  49                 for (int i = 0; i < top; i++){
  50                         switch (args [i]){
  51                         case "--help": case "-h": case "-?":
  52                                 Help ();
  53                                 return 1;
  54
  55                         case "-c":
  56                                 compile_only = true;
  57                                 break;
  58
  59                         case "-o":
  60                                 if (i+1 == top){
  61                                         Help ();
  62                                         return 1;
  63                                 }
  64                                 output = args [++i];
  65                                 break;
  66
  67                         case "-oo":
  68                                 if (i+1 == top){
  69                                         Help ();
  70                                         return 1;
  71                                 }
  72                                 object_out = args [++i];
  73                                 break;
  74
  75                         case "-L":
  76                                 if (i+1 == top){
  77                                         Help ();
  78                                         return 1;
  79                                 }
  80                                 link_paths.Add (args [++i]);
  81                                 break;
  82
  83                         case "--nodeps":
  84                                 autodeps = false;
  85                                 break;
  86
  87                         case "--deps":
  88                                 autodeps = true;
  89                                 break;
  90
  91                         case "--keeptemp":
  92                                 keeptemp = true;
  93                                 break;
  94                         case "--static":
  95                                 static_link = true;
  96                                 Console.WriteLine ("Note that statically linking the LGPL Mono runtime has more licensing restrictions than dynamically linking.");
  97                                 Console.WriteLine ("See http://www.mono-project.com/Licensing for details on licensing.");
  98                                 break;
  99                         case "--config":
 100                                 if (i+1 == top) {
 101                                         Help ();
 102                                         return 1;
 103                                 }
 104
 105                                 config_file = args [++i];
 106                                 break;
 107                         case "--machine-config":
 108                                 if (i+1 == top) {
 109                                         Help ();
 110                                         return 1;
 111                                 }
 112
 113                                 machine_config_file = args [++i];
 114
 115                                 Console.WriteLine ("WARNING:\n  Check that the machine.config file you are bundling\n  doesn't contain sensitive information specific to this machine.");
 116                                 break;
 117                         case "--config-dir":
 118                                 if (i+1 == top) {
 119                                         Help ();
 120                                         return 1;
 121                                 }
 122
 123                                 config_dir = args [++i];
 124                                 break;
 125                         case "-z":
 126                                 compress = true;
 127                                 break;
 128                         case "--nomain":
 129                                 nomain = true;
 130                                 break;
 131                         case "--style":
 132                                 if (i+1 == top) {
 133                                         Help ();
 134                                         return 1;
 135                                 }
 136                                 style = args [++i];
 137                                 switch (style) {
 138                                 case "windows":
 139                                 case "mac":
 140                                 case "linux":
 141                                         break;
 142                                 default:
 143                                         Console.Error.WriteLine ("Invalid style '{0}' - only 'windows', 'mac' and 'linux' are supported for --style argument", style);
 144                                         return 1;
 145                                 }
 146
 147                                 break;
 148                         default:
 149                                 sources.Add (args [i]);
 150                                 break;
 151                         }
 152
 153                         if (static_link && style == "windows") {
 154                                 Console.Error.WriteLine ("The option `{0}' is not supported on this platform.", args [i]);
 155                                 return 1;
 156                         }
 157                 }
 158
 159                 Console.WriteLine ("Sources: {0} Auto-dependencies: {1}", sources.Count, autodeps);
 160                 if (sources.Count == 0 || output == null) {
 161                         Help ();
 162                         Environment.Exit (1);
 163                 }
 164
 165                 List<Assembly> assemblies = LoadAssemblies (sources);
 166                 List<string> files = new List<string> ();
 167                 foreach (Assembly a in assemblies)
 168                         QueueAssembly (files, a.CodeBase);
 169
 170                 // Special casing mscorlib.dll: any specified mscorlib.dll cannot be loaded
 171                 // by Assembly.ReflectionFromLoadFrom(). Instead the fx assembly which runs
 172                 // mkbundle.exe is loaded, which is not what we want.
 173                 // So, replace it with whatever actually specified.
 174                 foreach (string srcfile in sources) {
 175                         if (Path.GetFileName (srcfile) == "mscorlib.dll") {
 176                                 foreach (string file in files) {
 177                                         if (Path.GetFileName (new Uri (file).LocalPath) == "mscorlib.dll") {
 178                                                 files.Remove (file);
 179                                                 files.Add (new Uri (Path.GetFullPath (srcfile)).LocalPath);
 180                                                 break;
 181                                         }
 182                                 }
 183                                 break;
 184                         }
 185                 }
 186
 187                 GenerateBundles (files);
 188                 //GenerateJitWrapper ();
 189
 190                 return 0;
 191         }
 192
 193         static void WriteSymbol (StreamWriter sw, string name, long size)
 194         {
 195                 switch (style){
 196                 case "linux":
 197                         sw.WriteLine (
 198                                 ".globl {0}\n" +
 199                                 "\t.section .rodata\n" +
 200                                 "\t.p2align 5\n" +
 201                                 "\t.type {0}, \"object\"\n" +
 202                                 "\t.size {0}, {1}\n" +
 203                                 "{0}:\n",
 204                                 name, size);
 205                         break;
 206                 case "osx":
 207                         sw.WriteLine (
 208                                 "\t.section __TEXT,__text,regular,pure_instructions\n" +
 209                                 "\t.globl _{0}\n" +
 210                                 "\t.data\n" +
 211                                 "\t.align 4\n" +
 212                                 "_{0}:\n",
 213                                 name, size);
 214                         break;
 215                 case "windows":
 216                         sw.WriteLine (
 217                                 ".globl _{0}\n" +
 218                                 "\t.section .rdata,\"dr\"\n" +
 219                                 "\t.align 32\n" +
 220                                 "_{0}:\n",
 221                                 name, size);
 222                         break;
 223                 }
 224         }
 225
 226         static string [] chars = new string [256];
 227
 228         static void WriteBuffer (StreamWriter ts, Stream stream, byte[] buffer)
 229         {
 230                 int n;
 231
 232                 // Preallocate the strings we need.
 233                 if (chars [0] == null) {
 234                         for (int i = 0; i < chars.Length; i++)
 235                                 chars [i] = string.Format ("{0}", i.ToString ());
 236                 }
 237
 238                 while ((n = stream.Read (buffer, 0, buffer.Length)) != 0) {
 239                         int count = 0;
 240                         for (int i = 0; i < n; i++) {
 241                                 if (count % 32 == 0) {
 242                                         ts.Write ("\n\t.byte ");
 243                                 } else {
 244                                         ts.Write (",");
 245                                 }
 246                                 ts.Write (chars [buffer [i]]);
 247                                 count ++;
 248                         }
 249                 }
 250
 251                 ts.WriteLine ();
 252         }
 253
 254         static void GenerateBundles (List<string> files)
 255         {
 256                 string temp_s = "temp.s"; // Path.GetTempFileName ();
 257                 string temp_c = "temp.c";
 258                 string temp_o = "temp.o";
 259
 260                 if (compile_only)
 261                         temp_c = output;
 262                 if (object_out != null)
 263                         temp_o = object_out;
 264
 265                 try {
 266                         List<string> c_bundle_names = new List<string> ();
 267                         List<string[]> config_names = new List<string[]> ();
 268                         byte [] buffer = new byte [8192];
 269
 270                         using (StreamWriter ts = new StreamWriter (File.Create (temp_s))) {
 271                         using (StreamWriter tc = new StreamWriter (File.Create (temp_c))) {
 272                         string prog = null;
 273
 274                         tc.WriteLine ("/* This source code was produced by mkbundle, do not edit */");
 275                         tc.WriteLine ("#include <mono/metadata/mono-config.h>");
 276                         tc.WriteLine ("#include <mono/metadata/assembly.h>\n");
 277
 278                         if (compress) {
 279                                 tc.WriteLine ("typedef struct _compressed_data {");
 280                                 tc.WriteLine ("\tMonoBundledAssembly assembly;");
 281                                 tc.WriteLine ("\tint compressed_size;");
 282                                 tc.WriteLine ("} CompressedAssembly;\n");
 283                         }
 284
 285                         object monitor = new object ();
 286
 287                         var streams = new Dictionary<string, Stream> ();
 288                         var sizes = new Dictionary<string, long> ();
 289
 290                         // Do the file reading and compression in parallel
 291                         Action<string> body = delegate (string url) {
 292                                 string fname = new Uri (url).LocalPath;
 293                                 Stream stream = File.OpenRead (fname);
 294
 295                                 long real_size = stream.Length;
 296                                 int n;
 297                                 if (compress) {
 298                                         MemoryStream ms = new MemoryStream ();
 299                                         GZipStream deflate = new GZipStream (ms, CompressionMode.Compress, leaveOpen:true);
 300                                         while ((n = stream.Read (buffer, 0, buffer.Length)) != 0){
 301                                                 deflate.Write (buffer, 0, n);
 302                                         }
 303                                         stream.Close ();
 304                                         deflate.Close ();
 305                                         byte [] bytes = ms.GetBuffer ();
 306                                         stream = new MemoryStream (bytes, 0, (int) ms.Length, false, false);
 307                                 }
 308
 309                                 lock (monitor) {
 310                                         streams [url] = stream;
 311                                         sizes [url] = real_size;
 312                                 }
 313                         };
 314
 315 #if NET_4_5
 316                         Parallel.ForEach (files, body);
 317 #else
 318                         foreach (var url in files)
 319                                 body (url);
 320 #endif
 321
 322                         // The non-parallel part
 323                         foreach (var url in files) {
 324                                 string fname = new Uri (url).LocalPath;
 325                                 string aname = Path.GetFileName (fname);
 326                                 string encoded = aname.Replace ("-", "_").Replace (".", "_");
 327
 328                                 if (prog == null)
 329                                         prog = aname;
 330
 331                                 var stream = streams [url];
 332                                 var real_size = sizes [url];
 333
 334                                 Console.WriteLine ("   embedding: " + fname);
 335
 336                                 WriteSymbol (ts, "assembly_data_" + encoded, stream.Length);
 337
 338                                 WriteBuffer (ts, stream, buffer);
 339
 340                                 if (compress) {
 341                                         tc.WriteLine ("extern const unsigned char assembly_data_{0} [];", encoded);
 342                                         tc.WriteLine ("static CompressedAssembly assembly_bundle_{0} = {{{{\"{1}\"," +
 343                                                                   " assembly_data_{0}, {2}}}, {3}}};",
 344                                                                   encoded, aname, real_size, stream.Length);
 345                                         double ratio = ((double) stream.Length * 100) / real_size;
 346                                         Console.WriteLine ("   compression ratio: {0:.00}%", ratio);
 347                                 } else {
 348                                         tc.WriteLine ("extern const unsigned char assembly_data_{0} [];", encoded);
 349                                         tc.WriteLine ("static const MonoBundledAssembly assembly_bundle_{0} = {{\"{1}\", assembly_data_{0}, {2}}};",
 350                                                                   encoded, aname, real_size);
 351                                 }
 352                                 stream.Close ();
 353
 354                                 c_bundle_names.Add ("assembly_bundle_" + encoded);
 355
 356                                 try {
 357                                         FileStream cf = File.OpenRead (fname + ".config");
 358                                         Console.WriteLine (" config from: " + fname + ".config");
 359                                         tc.WriteLine ("extern const unsigned char assembly_config_{0} [];", encoded);
 360                                         WriteSymbol (ts, "assembly_config_" + encoded, cf.Length);
 361                                         WriteBuffer (ts, cf, buffer);
 362                                         ts.WriteLine ();
 363                                         config_names.Add (new string[] {aname, encoded});
 364                                 } catch (FileNotFoundException) {
 365                                         /* we ignore if the config file doesn't exist */
 366                                 }
 367                         }
 368
 369                         if (config_file != null){
 370                                 FileStream conf;
 371                                 try {
 372                                         conf = File.OpenRead (config_file);
 373                                 } catch {
 374                                         Error (String.Format ("Failure to open {0}", config_file));
 375                                         return;
 376                                 }
 377                                 Console.WriteLine ("System config from: " + config_file);
 378                                 tc.WriteLine ("extern const char system_config;");
 379                                 WriteSymbol (ts, "system_config", config_file.Length);
 380
 381                                 WriteBuffer (ts, conf, buffer);
 382                                 // null terminator
 383                                 ts.Write ("\t.byte 0\n");
 384                                 ts.WriteLine ();
 385                         }
 386
 387                         if (machine_config_file != null){
 388                                 FileStream conf;
 389                                 try {
 390                                         conf = File.OpenRead (machine_config_file);
 391                                 } catch {
 392                                         Error (String.Format ("Failure to open {0}", machine_config_file));
 393                                         return;
 394                                 }
 395                                 Console.WriteLine ("Machine config from: " + machine_config_file);
 396                                 tc.WriteLine ("extern const char machine_config;");
 397                                 WriteSymbol (ts, "machine_config", machine_config_file.Length);
 398
 399                                 WriteBuffer (ts, conf, buffer);
 400                                 ts.Write ("\t.byte 0\n");
 401                                 ts.WriteLine ();
 402                         }
 403                         ts.Close ();
 404
 405                         Console.WriteLine ("Compiling:");
 406                         string cmd = String.Format ("{0} -o {1} {2} ", GetEnv ("AS", "as"), temp_o, temp_s);
 407                         int ret = Execute (cmd);
 408                         if (ret != 0){
 409                                 Error ("[Fail]");
 410                                 return;
 411                         }
 412
 413                         if (compress)
 414                                 tc.WriteLine ("\nstatic const CompressedAssembly *compressed [] = {");
 415                         else
 416                                 tc.WriteLine ("\nstatic const MonoBundledAssembly *bundled [] = {");
 417
 418                         foreach (string c in c_bundle_names){
 419                                 tc.WriteLine ("\t&{0},", c);
 420                         }
 421                         tc.WriteLine ("\tNULL\n};\n");
 422                         tc.WriteLine ("static char *image_name = \"{0}\";", prog);
 423
 424                         tc.WriteLine ("\nstatic void install_dll_config_files (void) {\n");
 425                         foreach (string[] ass in config_names){
 426                                 tc.WriteLine ("\tmono_register_config_for_assembly (\"{0}\", assembly_config_{1});\n", ass [0], ass [1]);
 427                         }
 428                         if (config_file != null)
 429                                 tc.WriteLine ("\tmono_config_parse_memory (&system_config);\n");
 430                         if (machine_config_file != null)
 431                                 tc.WriteLine ("\tmono_register_machine_config (&machine_config);\n");
 432                         tc.WriteLine ("}\n");
 433
 434                         if (config_dir != null)
 435                                 tc.WriteLine ("static const char *config_dir = \"{0}\";", config_dir);
 436                         else
 437                                 tc.WriteLine ("static const char *config_dir = NULL;");
 438
 439                         Stream template_stream;
 440                         if (compress) {
 441                                 template_stream = Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template_z.c");
 442                         } else {
 443                                 template_stream = Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template.c");
 444                         }
 445
 446                         StreamReader s = new StreamReader (template_stream);
 447                         string template = s.ReadToEnd ();
 448                         tc.Write (template);
 449
 450                         if (!nomain) {
 451                                 Stream template_main_stream = Assembly.GetAssembly (typeof(MakeBundle)).GetManifestResourceStream ("template_main.c");
 452                                 StreamReader st = new StreamReader (template_main_stream);
 453                                 string maintemplate = st.ReadToEnd ();
 454                                 tc.Write (maintemplate);
 455                         }
 456
 457                         tc.Close ();
 458
 459                         if (compile_only)
 460                                 return;
 461
 462                         string zlib = (compress ? "-lz" : "");
 463                         string debugging = "-g";
 464                         string cc = GetEnv ("CC", IsUnix ? "cc" : "gcc -mno-cygwin");
 465
 466                         if (style == "linux")
 467                                 debugging = "-ggdb";
 468                         if (static_link) {
 469                                 string smonolib;
 470                                 if (style == "osx")
 471                                         smonolib = "`pkg-config --variable=libdir mono-2`/libmono-2.0.a ";
 472                                 else
 473                                         smonolib = "-Wl,-Bstatic -lmono-2.0 -Wl,-Bdynamic ";
 474                                 cmd = String.Format ("{4} -o {2} -Wall `pkg-config --cflags mono-2` {0} {3} " +
 475                                                      "`pkg-config --libs-only-L mono-2` " + smonolib +
 476                                                      "`pkg-config --libs-only-l mono-2 | sed -e \"s/\\-lmono-2.0 //\"` {1}",
 477                                                      temp_c, temp_o, output, zlib, cc);
 478                         } else {
 479
 480                                 cmd = String.Format ("{4} " + debugging + " -o {2} -Wall {0} `pkg-config --cflags --libs mono-2` {3} {1}",
 481                                                      temp_c, temp_o, output, zlib, cc);
 482                         }
 483
 484                         ret = Execute (cmd);
 485                         if (ret != 0){
 486                                 Error ("[Fail]");
 487                                 return;
 488                         }
 489                         Console.WriteLine ("Done");
 490                         }
 491                         }
 492                 } finally {
 493                         if (!keeptemp){
 494                                 if (object_out == null){
 495                                         File.Delete (temp_o);
 496                                 }
 497                                 if (!compile_only){
 498                                         File.Delete (temp_c);
 499                                 }
 500                                 File.Delete (temp_s);
 501                         }
 502                 }
 503         }
 504
 505         static List<Assembly> LoadAssemblies (List<string> sources)
 506         {
 507                 List<Assembly> assemblies = new List<Assembly> ();
 508                 bool error = false;
 509
 510                 foreach (string name in sources){
 511                         Assembly a = LoadAssembly (name);
 512
 513                         if (a == null){
 514                                 error = true;
 515                                 continue;
 516                         }
 517
 518                         assemblies.Add (a);
 519                 }
 520
 521                 if (error)
 522                         Environment.Exit (1);
 523
 524                 return assemblies;
 525         }
 526
 527         static void QueueAssembly (List<string> files, string codebase)
 528         {
 529                 if (files.Contains (codebase))
 530                         return;
 531
 532                 files.Add (codebase);
 533                 Assembly a = Assembly.LoadFrom (new Uri(codebase).LocalPath);
 534
 535                 if (!autodeps)
 536                         return;
 537
 538                 foreach (AssemblyName an in a.GetReferencedAssemblies ()) {
 539                         a = Assembly.Load (an);
 540                         QueueAssembly (files, a.CodeBase);
 541                 }
 542         }
 543
 544         static Assembly LoadAssembly (string assembly)
 545         {
 546                 Assembly a;
 547
 548                 try {
 549                         char[] path_chars = { '/', '\\' };
 550
 551                         if (assembly.IndexOfAny (path_chars) != -1) {
 552                                 a = Assembly.LoadFrom (assembly);
 553                         } else {
 554                                 string ass = assembly;
 555                                 if (ass.EndsWith (".dll"))
 556                                         ass = assembly.Substring (0, assembly.Length - 4);
 557                                 a = Assembly.Load (ass);
 558                         }
 559                         return a;
 560                 } catch (FileNotFoundException){
 561                         string total_log = "";
 562
 563                         foreach (string dir in link_paths){
 564                                 string full_path = Path.Combine (dir, assembly);
 565                                 if (!assembly.EndsWith (".dll") && !assembly.EndsWith (".exe"))
 566                                         full_path += ".dll";
 567
 568                                 try {
 569                                         a = Assembly.LoadFrom (full_path);
 570                                         return a;
 571                                 } catch (FileNotFoundException ff) {
 572                                         total_log += ff.FusionLog;
 573                                         continue;
 574                                 }
 575                         }
 576                         Error ("Cannot find assembly `" + assembly + "'" );
 577                         Console.WriteLine ("Log: \n" + total_log);
 578                 } catch (BadImageFormatException f) {
 579                         Error ("Cannot load assembly (bad file format)" + f.FusionLog);
 580                 } catch (FileLoadException f){
 581                         Error ("Cannot load assembly " + f.FusionLog);
 582                 } catch (ArgumentNullException){
 583                         Error("Cannot load assembly (null argument)");
 584                 }
 585                 return null;
 586         }
 587
 588         static void Error (string msg)
 589         {
 590                 Console.Error.WriteLine (msg);
 591                 Environment.Exit (1);
 592         }
 593
 594         static void Help ()
 595         {
 596                 Console.WriteLine ("Usage is: mkbundle [options] assembly1 [assembly2...]\n\n" +
 597                                    "Options:\n" +
 598                                    "    -c                  Produce stub only, do not compile\n" +
 599                                    "    -o out              Specifies output filename\n" +
 600                                    "    -oo obj             Specifies output filename for helper object file\n" +
 601                                    "    -L path             Adds `path' to the search path for assemblies\n" +
 602                                    "    --nodeps            Turns off automatic dependency embedding (default)\n" +
 603                                    "    --deps              Turns on automatic dependency embedding\n" +
 604                                    "    --keeptemp          Keeps the temporary files\n" +
 605                                    "    --config F          Bundle system config file `F'\n" +
 606                                    "    --config-dir D      Set MONO_CFG_DIR to `D'\n" +
 607                                    "    --machine-config F  Use the given file as the machine.config for the application.\n" +
 608                                    "    --static            Statically link to mono libs\n" +
 609                                    "    --nomain            Don't include a main() function, for libraries\n" +
 610                                    "    -z                  Compress the assemblies before embedding.\n" +
 611                                    "                        You need zlib development headers and libraries.\n");
 612         }
 613
 614         [DllImport ("libc")]
 615         static extern int system (string s);
 616         [DllImport ("libc")]
 617         static extern int uname (IntPtr buf);
 618
 619         static void DetectOS ()
 620         {
 621                 if (!IsUnix) {
 622                         Console.WriteLine ("OS is: Windows");
 623                         style = "windows";
 624                         return;
 625                 }
 626
 627                 IntPtr buf = Marshal.AllocHGlobal (8192);
 628                 if (uname (buf) != 0){
 629                         Console.WriteLine ("Warning: Unable to detect OS");
 630                         Marshal.FreeHGlobal (buf);
 631                         return;
 632                 }
 633                 string os = Marshal.PtrToStringAnsi (buf);
 634                 Console.WriteLine ("OS is: " + os);
 635                 if (os == "Darwin")
 636                         style = "osx";
 637
 638                 Marshal.FreeHGlobal (buf);
 639         }
 640
 641         static bool IsUnix {
 642                 get {
 643                         int p = (int) Environment.OSVersion.Platform;
 644                         return ((p == 4) || (p == 128) || (p == 6));
 645                 }
 646         }
 647
 648         static int Execute (string cmdLine)
 649         {
 650                 if (IsUnix) {
 651                         Console.WriteLine (cmdLine);
 652                         return system (cmdLine);
 653                 }
 654
 655                 // on Windows, we have to pipe the output of a
 656                 // `cmd` interpolation to dos2unix, because the shell does not
 657                 // strip the CRLFs generated by the native pkg-config distributed
 658                 // with Mono.
 659                 StringBuilder b = new StringBuilder ();
 660                 int count = 0;
 661                 for (int i = 0; i < cmdLine.Length; i++) {
 662                         if (cmdLine [i] == '`') {
 663                                 if (count % 2 != 0) {
 664                                         b.Append ("|dos2unix");
 665                                 }
 666                                 count++;
 667                         }
 668                         b.Append (cmdLine [i]);
 669                 }
 670                 cmdLine = b.ToString ();
 671                 Console.WriteLine (cmdLine);
 672
 673                 ProcessStartInfo psi = new ProcessStartInfo ();
 674                 psi.UseShellExecute = false;
 675                 psi.FileName = "sh";
 676                 psi.Arguments = String.Format ("-c \"{0}\"", cmdLine);
 677
 678                 using (Process p = Process.Start (psi)) {
 679                         p.WaitForExit ();
 680                         return p.ExitCode;
 681                 }
 682         }
 683
 684         static string GetEnv (string name, string defaultValue)
 685         {
 686                 string s = Environment.GetEnvironmentVariable (name);
 687                 return s != null ? s : defaultValue;
 688         }
 689 }