1 /*
   2  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package org.openjdk.jigsaw.cli;
  27 
  28 import java.lang.module.*;
  29 import java.io.*;
  30 import java.net.*;
  31 import java.nio.file.Files;
  32 import java.nio.file.Path;
  33 import java.nio.file.Paths;
  34 import java.security.*;
  35 import java.util.*;
  36 
  37 import static java.lang.System.out;
  38 import static java.lang.System.err;
  39 
  40 import org.openjdk.jigsaw.*;
  41 import org.openjdk.jigsaw.SimpleLibrary.StorageOption;
  42 import org.openjdk.internal.joptsimple.*;
  43 
  44 
  45 public class Librarian {
  46 
  47     private static final JigsawModuleSystem jms
  48         = JigsawModuleSystem.instance();
  49 
  50     private static final File homeLibrary = Library.systemLibraryPath();
  51 
  52     static class Create extends Command<SimpleLibrary> {
  53         protected void go(SimpleLibrary lib)
  54             throws Command.Exception
  55         {
  56             noDry();
  57             finishArgs();
  58             File lp = libPath(opts);
  59             File pp = null;
  60             if (opts.has(parentPath))
  61                 pp = opts.valueOf(parentPath);
  62             else if (!opts.has("N"))
  63                 pp = homeLibrary;
  64 
  65             File natlibs = null;
  66             if (opts.has(nativeLibs))
  67                 natlibs = opts.valueOf(nativeLibs);
  68             File natcmds = null;
  69             if (opts.has(nativeCmds))
  70                 natcmds = opts.valueOf(nativeCmds);
  71             File configs = null;
  72             if (opts.has(configFiles))
  73                 configs = opts.valueOf(configFiles);
  74 
  75             Set<StorageOption> createOpts = new HashSet<>();
  76             if (opts.has("z"))
  77                 createOpts.add(StorageOption.DEFLATED);
  78 
  79             try {
  80                 lib = SimpleLibrary.create(lp, pp, natlibs, natcmds,
  81                                            configs, createOpts);
  82             } catch (IOException x) {
  83                 throw new Command.Exception(x);
  84             }
  85         }
  86     }
  87 
  88     static class DumpClass extends Command<SimpleLibrary> {
  89         protected void go(SimpleLibrary lib)
  90             throws Command.Exception
  91         {
  92             noDry();
  93             String mids = takeArg();
  94             ModuleId mid = null;
  95             try {
  96                 mid = jms.parseModuleId(mids);
  97             } catch (IllegalArgumentException x) {
  98                 throw new Command.Exception(x.getMessage());
  99             }
 100             String cn = takeArg();
 101             String ops = takeArg();
 102             finishArgs();
 103             byte[] bs = null;
 104             try {
 105                 bs = lib.readClass(mid, cn);
 106                 if (bs == null)
 107                     throw new Command.Exception("%s: No such class in module %s",
 108                                                 cn, mid);
 109                 OutputStream fout = null;
 110                 try {
 111                     fout = (ops.equals("-")
 112                             ? System.out
 113                             : new FileOutputStream(ops));
 114                     fout.write(bs);
 115                 } finally {
 116                     if (fout != null)
 117                         fout.close();
 118                 }
 119             } catch (IllegalArgumentException x) {
 120                 throw new Command.Exception(x.getMessage());
 121             } catch (IOException x) {
 122                 throw new Command.Exception(x);
 123             }
 124         }
 125     }
 126 
 127     static class Identify extends Command<SimpleLibrary> {
 128         protected void go(SimpleLibrary lib)
 129             throws Command.Exception
 130         {
 131             noDry();
 132             finishArgs();
 133             out.format("path %s%n", lib.root());
 134             out.format("version %d.%d%n",
 135                        lib.majorVersion(), lib.minorVersion());
 136             if (lib.natlibs() != null)
 137                 out.format("natlibs %s%n", lib.natlibs());
 138             if (lib.natcmds() != null)
 139                 out.format("natcmds %s%n", lib.natcmds());
 140             if (lib.configs() != null)
 141                 out.format("configs %s%n", lib.configs());
 142             SimpleLibrary plib = lib.parent();
 143             while (plib != null) {
 144                 out.format("parent %s%n", plib.root());
 145                 plib = plib.parent();
 146             }
 147         }
 148     }
 149 
 150     static class Extract extends Command<SimpleLibrary> {
 151         protected void go(SimpleLibrary lib)
 152             throws Command.Exception
 153         {
 154             noDry();
 155             while (hasArg()) {
 156                 File module = new File(takeArg());
 157                 File destination = null;
 158                 try (FileInputStream fis = new FileInputStream(module)) {
 159                     ModuleFile.Reader reader = new ModuleFile.Reader(fis);
 160 
 161                     ModuleInfo mi = jms.parseModuleInfo(reader.getModuleInfoBytes());
 162                     destination = new File(mi.id().name());
 163                     Path path = destination.toPath();
 164                     Files.deleteIfExists(path);
 165                     Files.createDirectory(path);
 166                     reader.extractTo(destination, false);
 167                 } catch (IOException | ModuleFileParserException x) {
 168                     // Try to cleanup if an exception is thrown
 169                     if (destination != null && destination.exists())
 170                         try {
 171                             FilePaths.deleteTree(destination.toPath());
 172                         } catch (IOException y) {
 173                             throw (Command.Exception)
 174                                 new Command.Exception(y).initCause(x);
 175                         }
 176                     throw new Command.Exception(x);
 177                 }
 178             }
 179             finishArgs();
 180         }
 181     }
 182 
 183     static class Install extends Command<SimpleLibrary> {
 184         protected void go(SimpleLibrary lib)
 185             throws Command.Exception
 186         {
 187             String key = takeArg();
 188             File kf = new File(key);
 189             boolean verifySignature = !opts.has("noverify");
 190             boolean strip = opts.has("G");
 191 
 192             // Old form: install <classes-dir> <module-name> ...
 193             //
 194             if (kf.exists() && kf.isDirectory()) {
 195                 noDry();
 196                 List<Manifest> mfs = new ArrayList<>();
 197                 while (hasArg())
 198                     mfs.add(Manifest.create(takeArg(), kf));
 199                 finishArgs();
 200                 if (mfs.isEmpty())
 201                     throw new Command.Exception("%s: no module-name specified",
 202                                                  command);
 203                 try {
 204                     lib.installFromManifests(mfs, strip);
 205                 } catch (ConfigurationException | IOException x) {
 206                     throw new Command.Exception(x);
 207                 }
 208                 return;
 209             }
 210 
 211             // Install one or more module file(s)
 212             //
 213             if (kf.exists() && kf.isFile()) {
 214                 noDry();
 215                 List<File> fs = new ArrayList<>();
 216                 fs.add(kf);
 217                 while (hasArg())
 218                     fs.add(new File(takeArg()));
 219                 finishArgs();
 220                 try {
 221                     lib.install(fs, verifySignature, strip);
 222                 } catch (ConfigurationException | IOException |
 223                          SignatureException | ModuleFileParserException x) {
 224                     throw new Command.Exception(x);
 225                 }
 226                 return;
 227             }
 228 
 229             // Otherwise treat args as module-id queries
 230             List<ModuleIdQuery> midqs = new ArrayList<>();
 231             String s = key;
 232             for (;;) {
 233                 ModuleIdQuery mq = null;
 234                 try {
 235                     mq = jms.parseModuleIdQuery(s);
 236                 } catch (IllegalArgumentException x) {
 237                     throw new Command.Exception(x);
 238                 }
 239                 midqs.add(mq);
 240                 if (!hasArg())
 241                     break;
 242                 s = takeArg();
 243             }
 244             try {
 245                 boolean quiet = false;  // ## Need -q
 246                 Resolution res = lib.resolve(midqs);
 247                 if (res.modulesNeeded().isEmpty()) {
 248                     if (!quiet)
 249                         out.format("Nothing to install%n");
 250                     return;
 251                 }
 252                 if (!quiet) {
 253                     out.format("To install: %s%n",
 254                                res.modulesNeeded()
 255                                .toString().replaceAll("^\\[|\\]$", ""));
 256                     out.format("%d bytes to download/transfer%n",
 257                                res.downloadRequired());
 258                     out.format("%d bytes to store%n",
 259                                res.spaceRequired());
 260                 }
 261                 if (dry)
 262                     return;
 263                 lib.install(res, verifySignature, strip);
 264             } catch (ConfigurationException | IOException | SignatureException |
 265                      ModuleFileParserException x) {
 266                 throw new Command.Exception(x);
 267             }
 268 
 269         }
 270     }
 271 
 272     // ## preinstall is used by jpkg for creating debian package.
 273     // ## need to revisit this
 274     static class PreInstall extends Command<SimpleLibrary> {
 275         protected void go(SimpleLibrary lib)
 276             throws Command.Exception
 277         {
 278             noDry();
 279             File classes = new File(takeArg());
 280             File dst = new File(takeArg());
 281             List<Manifest> mfs = new ArrayList<Manifest>();
 282             while (hasArg())
 283                 mfs.add(Manifest.create(takeArg(), classes));
 284             finishArgs();
 285             try {
 286                 lib.preInstall(mfs, dst);
 287             } catch (IOException x) {
 288                 throw new Command.Exception(x);
 289             }
 290         }
 291     }
 292 
 293     static class Remove extends Command<SimpleLibrary> {
 294         protected void go(SimpleLibrary lib)
 295             throws Command.Exception
 296         {
 297             if (dry && force)
 298                 throw new Command.Exception("%s: specify only one of "
 299                                         + "-n (--dry-run) or -f (--force)",
 300                                         command);
 301             List<ModuleId> mids = new ArrayList<ModuleId>();
 302             try {
 303                 while (hasArg())
 304                     mids.add(jms.parseModuleId(takeArg()));
 305             } catch (IllegalArgumentException x) {
 306                 throw new Command.Exception(x.getMessage());
 307             }
 308             boolean quiet = false;  // ## Need -q
 309             try {
 310                 if (force)
 311                     lib.removeForcibly(mids);
 312                 else
 313                     lib.remove(mids, dry);
 314             } catch (ConfigurationException x) {
 315                 throw new Command.Exception(x);
 316             } catch (IOException x) {
 317                 if (!quiet) {
 318                     for (Throwable t : x.getSuppressed())
 319                         err.format("Warning: %s%n", t.getMessage());
 320                 }
 321                 throw new Command.Exception(x);
 322             }
 323         }
 324     }
 325 
 326     static class DumpConfig extends Command<SimpleLibrary> {
 327         protected void go(SimpleLibrary lib)
 328             throws Command.Exception
 329         {
 330             noDry();
 331             String midqs = takeArg();
 332             ModuleIdQuery midq = null;
 333             try {
 334                 midq = jms.parseModuleIdQuery(midqs);
 335             } catch (IllegalArgumentException x) {
 336                 throw new Command.Exception(x.getMessage());
 337             }
 338             finishArgs();
 339             try {
 340                 ModuleId mid = lib.findLatestModuleId(midq);
 341                 if (mid == null)
 342                     throw new Command.Exception(midq + ": No such module");
 343                 Configuration<Context> cf = lib.readConfiguration(mid);
 344                 if (cf == null)
 345                     throw new Command.Exception(mid + ": Not a root module");
 346                 cf.dump(out, verbose);
 347             } catch (IOException x) {
 348                 throw new Command.Exception(x);
 349             }
 350         }
 351     }
 352 
 353     static class Config extends Command<SimpleLibrary> {
 354         protected void go(SimpleLibrary lib)
 355             throws Command.Exception
 356         {
 357             noDry();
 358             List<ModuleId> mids = new ArrayList<ModuleId>();
 359             try {
 360                 while (hasArg())
 361                     mids.add(jms.parseModuleId(takeArg()));
 362             } catch (IllegalArgumentException x) {
 363                 throw new Command.Exception(x.getMessage());
 364             }
 365             try {
 366                 lib.configure(mids);
 367             } catch (ConfigurationException x) {
 368                 throw new Command.Exception(x);
 369             } catch (IOException x) {
 370                 throw new Command.Exception(x);
 371             }
 372         }
 373     }
 374 
 375     static class ReIndex extends Command<SimpleLibrary> {
 376         protected void go(SimpleLibrary lib)
 377             throws Command.Exception
 378         {
 379             noDry();
 380             List<ModuleId> mids = new ArrayList<ModuleId>();
 381             try {
 382                 while (hasArg())
 383                     mids.add(jms.parseModuleId(takeArg()));
 384             } catch (IllegalArgumentException x) {
 385                 throw new Command.Exception(x.getMessage());
 386             }
 387             try {
 388                 lib.reIndex(mids);
 389             } catch (ConfigurationException x) {
 390                 throw new Command.Exception(x);
 391             } catch (IOException x) {
 392                 throw new Command.Exception(x);
 393             }
 394         }
 395     }
 396 
 397     static class Repos extends Command<SimpleLibrary> {
 398         protected void go(SimpleLibrary lib)
 399             throws Command.Exception
 400         {
 401             noDry();
 402             finishArgs();
 403             try {
 404                 RemoteRepositoryList rl = lib.repositoryList();
 405                 int i = 0;
 406                 for (RemoteRepository rr : rl.repositories())
 407                     out.format("%d %s%n", i++, rr.location());
 408             } catch (IOException x) {
 409                 throw new Command.Exception(x);
 410             }
 411         }
 412     }
 413 
 414     static URI parseURI(String s)
 415         throws Command.Exception
 416     {
 417         try {
 418             // if a scheme isn't specified then assume that a file path
 419             if (s.indexOf(':') == -1)
 420                 return Paths.get(s).toUri();
 421             return new URI(s);
 422         } catch (URISyntaxException x) {
 423             throw new Command.Exception("URI syntax error: "
 424                                         + x.getMessage());
 425         }
 426     }
 427 
 428     static class AddRepo extends Command<SimpleLibrary> {
 429         protected void go(SimpleLibrary lib)
 430             throws Command.Exception
 431         {
 432             noDry();
 433             URI u = parseURI(takeArg());
 434             int i = (opts.has(repoIndex)
 435                      ? opts.valueOf(repoIndex)
 436                      : Integer.MAX_VALUE);
 437             finishArgs();
 438             try {
 439                 RemoteRepositoryList rl = lib.repositoryList();
 440                 rl.add(u, i);
 441             } catch (IOException x) {
 442                 throw new Command.Exception(x);
 443             }
 444         }
 445     }
 446 
 447     static class DelRepo extends Command<SimpleLibrary> {
 448         protected void go(SimpleLibrary lib)
 449             throws Command.Exception
 450         {
 451             noDry();
 452             URI u = null;
 453             int i = -1;
 454             if (hasArg()) {
 455                 String s = takeArg();
 456                 if (!s.endsWith("/"))
 457                     s += "/";
 458                 u = parseURI(s);
 459                 finishArgs();
 460             }
 461             if (opts.has(repoIndex))
 462                 i = opts.valueOf(repoIndex);
 463             if (u != null && i != -1) {
 464                 throw new Command.Exception("del-repo: Cannot specify"
 465                                             + " both -i and a URL");
 466             }
 467             if (u == null && i == -1) {
 468                 throw new Command.Exception("del-repo: One of -i <index>"
 469                                             + " or a URL required");
 470             }
 471             try {
 472                 RemoteRepositoryList rl = lib.repositoryList();
 473                 if (i != -1) {
 474                     rl.remove(rl.repositories().get(i));
 475                     return;
 476                 }
 477                 for (RemoteRepository rr : rl.repositories()) {
 478                     if (rr.location().equals(u)) {
 479                         rl.remove(rr);
 480                         return;
 481                     }
 482                 }
 483                 throw new Command.Exception("No repository found for deletion");
 484             } catch (IOException x) {
 485                 throw new Command.Exception(x);
 486             }
 487         }
 488     }
 489 
 490     static class Refresh extends Command<SimpleLibrary> {
 491         protected void go(SimpleLibrary lib)
 492             throws Command.Exception
 493         {
 494             finishArgs();
 495             try {
 496                 // refresh the module directory
 497                 lib.refresh();
 498 
 499                 // refresh the repository catalog
 500                 RemoteRepositoryList rl = lib.repositoryList();
 501                 int n = 0;
 502                 for (RemoteRepository rr : rl.repositories()) {
 503                     out.format("%s - ", rr.location());
 504                     out.flush();
 505                     boolean stale
 506                         = dry ? rr.isCatalogStale() : rr.updateCatalog(force);
 507                     if (stale) {
 508                         n++;
 509                         out.format(dry ? "out of date%n" : "updated%n");
 510                     } else {
 511                         out.format("up to date%n");
 512                     }
 513                 }
 514             } catch (IOException x) {
 515                 throw new Command.Exception(x);
 516             }
 517         }
 518     }
 519 
 520     private static final Map<String,Class<? extends Command<SimpleLibrary>>> commands
 521         = new HashMap<>();
 522 
 523     static {
 524         commands.put("add-repo", AddRepo.class);
 525         commands.put("config", Config.class);
 526         commands.put("create", Create.class);
 527         commands.put("del-repo", DelRepo.class);
 528         commands.put("dump-class", DumpClass.class);
 529         commands.put("dump-config", DumpConfig.class);
 530         commands.put("extract", Extract.class);
 531         commands.put("id", Identify.class);
 532         commands.put("identify", Identify.class);
 533         commands.put("install", Install.class);
 534         commands.put("list", Commands.ListLibrary.class);
 535         commands.put("ls", Commands.ListLibrary.class);
 536         commands.put("preinstall", PreInstall.class);
 537         commands.put("refresh", Refresh.class);
 538         commands.put("reindex", ReIndex.class);
 539         commands.put("remove", Remove.class);
 540         commands.put("rm", Remove.class);
 541         commands.put("repos", Repos.class);
 542     }
 543 
 544     private OptionParser parser;
 545 
 546     private static OptionSpec<Integer> repoIndex; // ##
 547     private static OptionSpec<File> libPath;
 548     private static OptionSpec<File> parentPath;
 549     private static OptionSpec<File> nativeLibs;
 550     private static OptionSpec<File> nativeCmds;
 551     private static OptionSpec<File> configFiles;
 552 
 553     private void usage() {
 554         out.format("%n");
 555         out.format("usage: jmod add-repo [-i <index>] URL%n");
 556         out.format("       jmod config [<module-id> ...]%n");
 557         out.format("       jmod create [-L <library>] [-P <parent>]" +
 558                 " [--natlib <natlib>] [--natcmd <natcmd>] [--config <config>]%n");
 559         out.format("       jmod del-repo URL%n");
 560         out.format("       jmod dump-class <module-id> <class-name> <output-file>%n");
 561         out.format("       jmod dump-config <module-id>%n");
 562         out.format("       jmod extract <module-file> ...%n");
 563         out.format("       jmod identify%n");
 564         out.format("       jmod install [--noverify] [-n] <module-id-query> ...%n");
 565         out.format("       jmod install [--noverify] <module-file> ...%n");
 566         out.format("       jmod install <classes-dir> <module-name> ...%n");
 567         out.format("       jmod list [-v] [-p] [-R] [<module-id-query>]%n");
 568         out.format("       jmod preinstall <classes-dir> <dst-dir> <module-name> ...%n");
 569         out.format("       jmod refresh [-f] [-n] [-v]%n");
 570         out.format("       jmod reindex [<module-id> ...]%n");
 571         out.format("       jmod remove [-f] [-n] [<module-id> ...]%n");
 572         out.format("       jmod repos [-v]%n");
 573         out.format("%n");
 574         try {
 575             parser.printHelpOn(out);
 576         } catch (IOException x) {
 577             throw new AssertionError(x);
 578         }
 579         out.format("%n");
 580         System.exit(0);
 581     }
 582 
 583     public static void run(String [] args) throws OptionException, Command.Exception {
 584         new Librarian().exec(args);
 585     }
 586 
 587     private void exec(String[] args) throws OptionException, Command.Exception {
 588         parser = new OptionParser();
 589 
 590         // ## Need subcommand-specific option parsing
 591         libPath
 592             = (parser.acceptsAll(Arrays.asList("L", "library"),
 593                                  "Module-library location"
 594                                  + " (default $JAVA_MODULES)")
 595                .withRequiredArg()
 596                .describedAs("path")
 597                .ofType(File.class));
 598         parentPath
 599             = (parser.acceptsAll(Arrays.asList("P", "parent-path"),
 600                                  "Parent module-library location")
 601                .withRequiredArg()
 602                .describedAs("path")
 603                .ofType(File.class));
 604         nativeLibs
 605             = (parser.accepts("natlib", "Directory to store native libs")
 606                .withRequiredArg()
 607                .describedAs("dir")
 608                .ofType(File.class));
 609         nativeCmds
 610             = (parser.accepts("natcmd", "Directory to store native launchers")
 611                .withRequiredArg()
 612                .describedAs("dir")
 613                .ofType(File.class));
 614         configFiles
 615             = (parser.accepts("config", "Directory to store config files")
 616                .withRequiredArg()
 617                .describedAs("dir")
 618                .ofType(File.class));
 619         parser.acceptsAll(Arrays.asList("N", "no-parent"),
 620                           "Use no parent library when creating");
 621         parser.acceptsAll(Arrays.asList("v", "verbose"),
 622                           "Enable verbose output");
 623         parser.acceptsAll(Arrays.asList("h", "?", "help"),
 624                           "Show this help message");
 625         parser.acceptsAll(Arrays.asList("p", "parent"),
 626                           "Apply operation to parent library, if any");
 627         parser.acceptsAll(Arrays.asList("z", "enable-compression"),
 628                           "Enable compression of module contents");
 629         repoIndex
 630             = (parser.acceptsAll(Arrays.asList("i"),
 631                                  "Repository-list index")
 632                .withRequiredArg()
 633                .describedAs("index")
 634                .ofType(Integer.class));
 635         parser.acceptsAll(Arrays.asList("f", "force"),
 636                           "Force the requested operation");
 637         parser.acceptsAll(Arrays.asList("n", "dry-run"),
 638                           "Dry-run the requested operation");
 639         parser.acceptsAll(Arrays.asList("R", "repos"),
 640                           "List contents of associated repositories");
 641         parser.acceptsAll(Arrays.asList("noverify"),
 642                           "Do not verify module signatures. "
 643                           + "Treat as unsigned.");
 644         parser.acceptsAll(Arrays.asList("G", "strip-debug"),
 645                           "Strip debug attributes during installation");
 646 
 647         if (args.length == 0)
 648             usage();
 649 
 650         OptionSet opts = parser.parse(args);
 651         if (opts.has("h"))
 652             usage();
 653         List<String> words = opts.nonOptionArguments();
 654         if (words.isEmpty())
 655             usage();
 656         String verb = words.get(0);
 657         Class<? extends Command<SimpleLibrary>> cmd = commands.get(verb);
 658         if (cmd == null)
 659             throw new Command.Exception("%s: unknown command", verb);
 660 
 661         // Every command, except 'create' and 'extract', needs
 662         // to have a valid reference to the library
 663         SimpleLibrary lib = null;
 664         if (!(verb.equals("create") || verb.equals("extract"))) {
 665             File lp = libPath(opts);
 666             try {
 667                 lib = SimpleLibrary.open(lp);
 668             } catch (FileNotFoundException x) {
 669                 String msg = null;
 670                 File f = new File(x.getMessage());
 671                 try {
 672                     f = f.getCanonicalFile();
 673                     if (lp.getCanonicalFile().equals(f))
 674                         msg = "No such library";
 675                     else
 676                         msg = "Cannot open parent library " + f;
 677                 } catch (IOException y) {
 678                     throw new Command.Exception(y);
 679                 }
 680                 throw new Command.Exception("%s: %s", lp, msg);
 681             } catch (IOException x) {
 682                 throw new Command.Exception(x);
 683             }
 684         }
 685         try {
 686             cmd.newInstance().run(lib, opts);
 687         } catch (InstantiationException x) {
 688             throw new AssertionError(x);
 689         } catch (IllegalAccessException x) {
 690             throw new AssertionError(x);
 691         }
 692     }
 693 
 694     private static File libPath(OptionSet opts) {
 695         if (opts.has(libPath)) {
 696             return opts.valueOf(libPath);
 697         } else {
 698             String jm = System.getenv("JAVA_MODULES");
 699             if (jm != null)
 700                 return new File(jm);
 701             else
 702                 return homeLibrary;
 703         }
 704     }
 705 
 706     private Librarian() { }
 707 
 708     public static void main(String[] args) {
 709         try {
 710             run(args);
 711         } catch (OptionException x) {
 712             err.println(x.getMessage());
 713             System.exit(1);
 714         } catch (Command.Exception x) {
 715             err.println(x.getMessage());
 716             x.printStackTrace();
 717             System.exit(1);
 718         }
 719     }
 720 
 721 }