build.py

   1 # Copyright (C) 2006, Thomas Leonard
   2 # See http://0install.net/0compile.html
   3
   4 import sys, os, __main__, time, shutil, glob, codecs, subprocess
   5 from os.path import join
   6 from logging import info, warn
   7 from xml.dom import minidom, XMLNS_NAMESPACE
   8 from optparse import OptionParser
   9 import tempfile
  10
  11 from zeroinstall import SafeException
  12 from zeroinstall.injector import model, namespaces
  13 from zeroinstall.injector.iface_cache import iface_cache
  14
  15 from support import BuildEnv, ensure_dir, XMLNS_0COMPILE, is_package_impl, parse_bool, depth
  16 from support import spawn_and_check, find_in_path, ENV_FILE, lookup, spawn_maybe_sandboxed, Prefixes
  17
  18 if hasattr(os.path, 'relpath'):
  19         relpath = os.path.relpath
  20 else:
  21         # Copied from Python 2.6 (GPL compatible license)
  22         # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006 Python Software Foundation; All Rights Reserved
  23
  24         # Return the longest prefix of all list elements.
  25         def commonprefix(m):
  26                 "Given a list of pathnames, returns the longest common leading component"
  27                 if not m: return ''
  28                 s1 = min(m)
  29                 s2 = max(m)
  30                 for i, c in enumerate(s1):
  31                         if c != s2[i]:
  32                                 return s1[:i]
  33                 return s1
  34
  35         def relpath(path, start):
  36                 """Return a relative version of a path"""
  37
  38                 if not path:
  39                         raise ValueError("no path specified")
  40
  41                 start_list = os.path.abspath(start).split('/')
  42                 path_list = os.path.abspath(path).split('/')
  43
  44                 # Work out how much of the filepath is shared by start and path.
  45                 i = len(commonprefix([start_list, path_list]))
  46
  47                 rel_list = ['..'] * (len(start_list)-i) + path_list[i:]
  48                 if not rel_list:
  49                         return '.'
  50                 return join(*rel_list)
  51
  52 # If we have to modify any pkg-config files, we put the new versions in $TMPDIR/PKG_CONFIG_OVERRIDES
  53 PKG_CONFIG_OVERRIDES = 'pkg-config-overrides'
  54
  55 def env(name, value):
  56         os.environ[name] = value
  57         print "%s=%s" % (name, value)
  58
  59 def do_env_binding(binding, path):
  60         env(binding.name, binding.get_value(path, os.environ.get(binding.name, None)))
  61
  62 def correct_for_64bit(base, rel_path):
  63         """If rel_path starts lib or usr/lib and doesn't exist, try with lib64 instead."""
  64         if os.path.exists(os.path.join(base, rel_path)):
  65                 return rel_path
  66
  67         if rel_path.startswith('lib/') or rel_path.startswith('usr/lib/'):
  68                 new_rel_path = rel_path.replace('lib/', 'lib64/', 1)
  69                 if os.path.exists(os.path.join(base, new_rel_path)):
  70                         return new_rel_path
  71
  72         return rel_path
  73
  74 def write_pc(name, lines):
  75         overrides_dir = os.path.join(os.environ['TMPDIR'], PKG_CONFIG_OVERRIDES)
  76         if not os.path.isdir(overrides_dir):
  77                 os.mkdir(overrides_dir)
  78         stream = open(os.path.join(overrides_dir, name), 'w')
  79         stream.write(''.join(lines))
  80         stream.close()
  81
  82 def do_pkg_config_binding(binding, impl):
  83         feed_name = impl.feed.split('/')[-1]
  84         path = lookup(impl)
  85         new_insert = correct_for_64bit(path, binding.insert)
  86         if new_insert != binding.insert:
  87                 print "PKG_CONFIG_PATH dir <%s>/%s not found; using %s instead" % (feed_name, binding.insert, new_insert)
  88                 binding = model.EnvironmentBinding(binding.name,
  89                                         new_insert,
  90                                         binding.default,
  91                                         binding.mode)
  92
  93         orig_path = os.path.join(path, binding.insert)
  94         if os.path.isdir(orig_path):
  95                 for pc in os.listdir(orig_path):
  96                         stream = open(os.path.join(orig_path, pc))
  97                         lines = stream.readlines()
  98                         stream.close()
  99                         for i, line in enumerate(lines):
 100                                 if '=' not in line: continue
 101                                 name, value = [x.strip() for x in line.split('=', 1)]
 102                                 if name == 'prefix' and value.startswith('/'):
 103                                         print "Absolute prefix=%s in %s; overriding..." % (value, feed_name)
 104                                         lines[i] = 'prefix=%s/%s\n' % (path, value[1:])
 105                                         write_pc(pc, lines)
 106                                         break
 107         do_env_binding(binding, path)
 108
 109 def fixup_generated_pkgconfig_file(pc_file):
 110         stream = open(pc_file)
 111         lines = stream.readlines()
 112         stream.close()
 113         for i, line in enumerate(lines):
 114                 if '=' not in line: continue
 115                 name, value = [x.strip() for x in line.split('=', 1)]
 116                 if name == 'prefix' and value.startswith('/'):
 117                         print "Absolute prefix=%s in %s; fixing..." % (value, pc_file)
 118                         rel_path = relpath(value, os.path.dirname(pc_file))     # Requires Python 2.6
 119                         lines[i] = 'prefix=${pcfiledir}/%s\n' % rel_path
 120                         write_pc(pc_file, lines)
 121                         break
 122
 123 # After doing a build, check that we didn't generate pkgconfig files with absolute paths
 124 # Rewrite if so
 125 def fixup_generated_pkgconfig_files():
 126         for root, dirs, files in os.walk(os.environ['DISTDIR']):
 127                 if os.path.basename(root) == 'pkgconfig':
 128                         for f in files:
 129                                 if f.endswith('.pc'):
 130                                         info("Checking generated pkgconfig file '%s'", f)
 131                                         fixup_generated_pkgconfig_file(os.path.join(root, f))
 132
 133 def remove_la_file(path):
 134         # Read the contents...
 135         stream = open(path)
 136         data = stream.read()
 137         stream.close()
 138
 139         # Check it really is a libtool archive...
 140         if 'Please DO NOT delete this file' not in data:
 141                 warn("Ignoring %s; doesn't look like a libtool archive", path)
 142                 return
 143
 144         os.unlink(path)
 145         print "Removed %s (.la files contain absolute paths)" % path
 146
 147 # libtool archives contain hard-coded paths. Lucky, modern systems don't need them, so remove
 148 # them.
 149 def remove_la_files():
 150         for root, dirs, files in os.walk(os.environ['DISTDIR']):
 151                 if os.path.basename(root) == 'lib':
 152                         for f in files:
 153                                 if f.endswith('.la'):
 154                                         remove_la_file(os.path.join(root, f))
 155                                 if f.endswith('.a'):
 156                                         warn("Found static archive '%s'; maybe build with --disable-static?", f)
 157
 158 def do_build_internal(options, args):
 159         """build-internal"""
 160         # If a sandbox is being used, we're in it now.
 161         import getpass, socket
 162
 163         buildenv = BuildEnv()
 164         sels = buildenv.get_selections()
 165
 166         builddir = os.path.realpath('build')
 167         ensure_dir(buildenv.metadir)
 168
 169         build_env_xml = join(buildenv.metadir, 'build-environment.xml')
 170
 171         buildenv_doc = sels.toDOM()
 172
 173         # Create build-environment.xml file
 174         root = buildenv_doc.documentElement
 175         info = buildenv_doc.createElementNS(XMLNS_0COMPILE, 'build-info')
 176         root.appendChild(info)
 177         info.setAttributeNS(None, 'time', time.strftime('%Y-%m-%d %H:%M').strip())
 178         info.setAttributeNS(None, 'host', socket.getfqdn())
 179         info.setAttributeNS(None, 'user', getpass.getuser())
 180         uname = os.uname()
 181         info.setAttributeNS(None, 'arch', '%s-%s' % (uname[0], uname[4]))
 182         stream = file(build_env_xml, 'w')
 183         buildenv_doc.writexml(stream, addindent="  ", newl="\n")
 184         stream.close()
 185
 186         # Create local binary interface file
 187         src_iface = iface_cache.get_interface(buildenv.interface)
 188         src_impl = buildenv.chosen_impl(buildenv.interface)
 189         write_sample_interface(buildenv, src_iface, src_impl)
 190
 191         # Check 0compile is new enough
 192         min_version = model.parse_version(src_impl.attrs.get(XMLNS_0COMPILE + ' min-version', None))
 193         if min_version and min_version > model.parse_version(__main__.version):
 194                 raise SafeException("%s-%s requires 0compile >= %s, but we are only version %s" %
 195                                 (src_iface.get_name(), src_impl.version, model.format_version(min_version), __main__.version))
 196
 197         # Create the patch
 198         patch_file = join(buildenv.metadir, 'from-%s.patch' % src_impl.version)
 199         if buildenv.user_srcdir:
 200                 # (ignore errors; will already be shown on stderr)
 201                 os.system("diff -urN '%s' src > %s" %
 202                         (buildenv.orig_srcdir.replace('\\', '\\\\').replace("'", "\\'"),
 203                          patch_file))
 204                 if os.path.getsize(patch_file) == 0:
 205                         os.unlink(patch_file)
 206         elif os.path.exists(patch_file):
 207                 os.unlink(patch_file)
 208
 209         env('BUILDDIR', builddir)
 210         env('DISTDIR', buildenv.distdir)
 211         env('SRCDIR', buildenv.user_srcdir or buildenv.orig_srcdir)
 212         os.chdir(builddir)
 213         print "cd", builddir
 214
 215         for needed_iface in sels.selections:
 216                 impl = buildenv.chosen_impl(needed_iface)
 217                 assert impl
 218
 219                 def process_bindings(bindings, dep_impl):
 220                         if dep_impl.id.startswith('package:'):
 221                                 return
 222                         for b in bindings:
 223                                 if isinstance(b, model.EnvironmentBinding):
 224                                         if b.name == 'PKG_CONFIG_PATH':
 225                                                 do_pkg_config_binding(b, dep_impl)
 226                                         else:
 227                                                 do_env_binding(b, lookup(dep_impl))
 228
 229                 # Bindings that tell this component how to find itself...
 230                 process_bindings(impl.bindings, impl)
 231
 232                 # Bindings that tell this component how to find its dependencies...
 233                 for dep in impl.dependencies:
 234                         dep_impl = buildenv.chosen_impl(dep.interface)
 235                         process_bindings(dep.bindings, dep_impl)
 236
 237         # These mappings are needed when mixing Zero Install -dev packages with
 238         # native package binaries.
 239         mappings = {}
 240         for impl in sels.selections.values():
 241                 # Add mappings that have been set explicitly...
 242                 new_mappings = impl.attrs.get(XMLNS_0COMPILE + ' lib-mappings', '')
 243                 if new_mappings:
 244                         new_mappings = new_mappings.split(' ')
 245                         for mapping in new_mappings:
 246                                 assert ':' in mapping, "lib-mappings missing ':' in '%s' from '%s'" % (mapping, impl.feed)
 247                                 name, major_version = mapping.split(':', 1)
 248                                 assert '/' not in mapping, "lib-mappings '%s' contains a / in the version number (from '%s')!" % (mapping, impl.feed)
 249                                 if sys.platform == 'darwin':
 250                                         mappings[name] = 'lib%s.%s.dylib' % (name, major_version)
 251                                 else:
 252                                         mappings[name] = 'lib%s.so.%s' % (name, major_version)
 253                 # Auto-detect required mappings where possible...
 254                 # (if the -dev package is native, the symlinks will be OK)
 255                 if not is_package_impl(impl):
 256                         impl_path = lookup(impl)
 257                         for libdirname in ['lib', 'usr/lib', 'lib64', 'usr/lib64']:
 258                                 libdir = os.path.join(impl_path, libdirname)
 259                                 if os.path.isdir(libdir):
 260                                         find_broken_version_symlinks(libdir, mappings)
 261
 262         if mappings:
 263                 set_up_mappings(mappings)
 264
 265         overrides_dir = os.path.join(os.environ['TMPDIR'], PKG_CONFIG_OVERRIDES)
 266         if os.path.isdir(overrides_dir):
 267                 add_overrides = model.EnvironmentBinding('PKG_CONFIG_PATH', PKG_CONFIG_OVERRIDES)
 268                 do_env_binding(add_overrides, os.environ['TMPDIR'])
 269
 270         # Some programs want to put temporary build files in the source directory.
 271         # Make a copy of the source if needed.
 272         dup_src_type = src_impl.attrs.get(XMLNS_0COMPILE + ' dup-src', None)
 273         if dup_src_type == 'true':
 274                 dup_src(shutil.copy2)
 275                 env('SRCDIR', builddir)
 276         elif dup_src_type:
 277                 raise Exception("Unknown dup-src value '%s'" % dup_src_type)
 278
 279         if options.shell:
 280                 spawn_and_check(find_in_path('sh'), [])
 281         else:
 282                 compile_command = sels.commands[0]
 283                 if compile_command:
 284                         command = compile_command.qdom.attrs['shell-command']
 285                 else:
 286                         command = src_impl.attrs[XMLNS_0COMPILE + ' command']
 287
 288                 # Remove any existing log files
 289                 for log in ['build.log', 'build-success.log', 'build-failure.log']:
 290                         if os.path.exists(log):
 291                                 os.unlink(log)
 292
 293                 # Run the command, copying output to a new log
 294                 log = file('build.log', 'w')
 295                 try:
 296                         print >>log, "Build log for %s-%s" % (src_iface.get_name(),
 297                                                               src_impl.version)
 298                         print >>log, "\nBuilt using 0compile-%s" % __main__.version
 299                         print >>log, "\nBuild system: " + ', '.join(uname)
 300                         print >>log, "\n%s:\n" % ENV_FILE
 301                         shutil.copyfileobj(file("../" + ENV_FILE), log)
 302
 303                         log.write('\n')
 304
 305                         if os.path.exists(patch_file):
 306                                 print >>log, "\nPatched with:\n"
 307                                 shutil.copyfileobj(file(patch_file), log)
 308                                 log.write('\n')
 309
 310                         print "Executing: " + command, args
 311                         print >>log, "Executing: " + command, args
 312
 313                         # Tee the output to the console and to the log
 314                         child = subprocess.Popen(['/bin/sh', '-c', command + ' "$@"', '-'] + args, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
 315                         while True:
 316                                 data = os.read(child.stdout.fileno(), 100)
 317                                 if not data: break
 318                                 sys.stdout.write(data)
 319                                 log.write(data)
 320                         status = child.wait()
 321                         failure = None
 322                         if status == 0:
 323                                 print >>log, "Build successful"
 324                                 fixup_generated_pkgconfig_files()
 325                                 remove_la_files()
 326                         elif status > 0:
 327                                 failure = "Build failed with exit code %d" % status
 328                         else:
 329                                 failure = "Build failure: exited due to signal %d" % (-status)
 330                         if failure:
 331                                 print >>log, failure
 332                                 os.rename('build.log', 'build-failure.log')
 333                                 raise SafeException("Command '%s': %s" % (command, failure))
 334                         else:
 335                                 os.rename('build.log', 'build-success.log')
 336                 finally:
 337                         log.close()
 338
 339 def do_build(args):
 340         """build [ --no-sandbox ] [ --shell | --force | --clean ]"""
 341         buildenv = BuildEnv()
 342         sels = buildenv.get_selections()
 343
 344         parser = OptionParser(usage="usage: %prog build [options]")
 345
 346         parser.add_option('', "--no-sandbox", help="disable use of sandboxing", action='store_true')
 347         parser.add_option("-s", "--shell", help="run a shell instead of building", action='store_true')
 348         parser.add_option("-c", "--clean", help="remove the build directories", action='store_true')
 349         parser.add_option("-f", "--force", help="build even if dependencies have changed", action='store_true')
 350
 351         parser.disable_interspersed_args()
 352
 353         (options, args2) = parser.parse_args(args)
 354
 355         builddir = os.path.realpath('build')
 356
 357         changes = buildenv.get_build_changes()
 358         if changes:
 359                 if not (options.force or options.clean):
 360                         raise SafeException("Build dependencies have changed:\n" +
 361                                         '\n'.join(changes) + "\n\n" +
 362                                         "To build anyway, use: 0compile build --force\n" +
 363                                         "To do a clean build:  0compile build --clean")
 364                 if not options.no_sandbox:
 365                         print "Build dependencies have changed:\n" + '\n'.join(changes)
 366
 367         ensure_dir(builddir, options.clean)
 368         ensure_dir(buildenv.distdir, options.clean)
 369
 370         if options.no_sandbox:
 371                 return do_build_internal(options, args2)
 372
 373         tmpdir = tempfile.mkdtemp(prefix = '0compile-')
 374         try:
 375                 my_dir = os.path.dirname(__file__)
 376                 readable = ['.', my_dir]
 377                 writable = ['build', buildenv.distdir, tmpdir]
 378                 env('TMPDIR', tmpdir)
 379
 380                 for selection in sels.selections.values():
 381                         if not is_package_impl(selection):
 382                                 readable.append(lookup(selection))
 383
 384                 options = []
 385                 if __main__.options.verbose:
 386                         options.append('--verbose')
 387
 388                 readable.append('/etc') # /etc/ld.*
 389
 390                 spawn_maybe_sandboxed(readable, writable, tmpdir, sys.executable, ['-u', sys.argv[0]] + options + ['build', '--no-sandbox'] + args)
 391         finally:
 392                 info("Deleting temporary directory '%s'" % tmpdir)
 393                 shutil.rmtree(tmpdir)
 394
 395 def write_sample_interface(buildenv, iface, src_impl):
 396         path = buildenv.local_iface_file
 397         target_arch = buildenv.target_arch
 398
 399         impl = minidom.getDOMImplementation()
 400
 401         XMLNS_IFACE = namespaces.XMLNS_IFACE
 402
 403         doc = impl.createDocument(XMLNS_IFACE, "interface", None)
 404
 405         root = doc.documentElement
 406         root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns', XMLNS_IFACE)
 407         prefixes = Prefixes(XMLNS_IFACE)
 408
 409         def addSimple(parent, name, text = None):
 410                 elem = doc.createElementNS(XMLNS_IFACE, name)
 411
 412                 parent.appendChild(doc.createTextNode('\n' + '  ' * (1 + depth(parent))))
 413                 parent.appendChild(elem)
 414                 if text:
 415                         elem.appendChild(doc.createTextNode(text))
 416                 return elem
 417
 418         def close(element):
 419                 element.appendChild(doc.createTextNode('\n' + '  ' * depth(element)))
 420
 421         addSimple(root, 'name', iface.name)
 422         addSimple(root, 'summary', iface.summary)
 423         addSimple(root, 'description', iface.description)
 424         feed_for = addSimple(root, 'feed-for')
 425
 426         uri = iface.uri
 427         if uri.startswith('/'):
 428                 print "Note: source %s is a local feed" % iface.uri
 429                 for feed_uri in iface.feed_for or []:
 430                         uri = feed_uri
 431                         print "Will use <feed-for interface='%s'> instead..." % uri
 432                         break
 433                 else:
 434                         master_feed = minidom.parse(uri).documentElement
 435                         if master_feed.hasAttribute('uri'):
 436                                 uri = master_feed.getAttribute('uri')
 437                                 print "Will use <feed-for interface='%s'> instead..." % uri
 438
 439         feed_for.setAttributeNS(None, 'interface', uri)
 440
 441         group = addSimple(root, 'group')
 442         main = src_impl.attrs.get(XMLNS_0COMPILE + ' binary-main', None)
 443         if main:
 444                 group.setAttributeNS(None, 'main', main)
 445
 446         lib_mappings = src_impl.attrs.get(XMLNS_0COMPILE + ' binary-lib-mappings', None)
 447         if lib_mappings:
 448                 prefixes.setAttributeNS(group, XMLNS_0COMPILE, 'lib-mappings', lib_mappings)
 449
 450         for d in src_impl.dependencies:
 451                 # 0launch < 0.32 messed up the namespace...
 452                 if parse_bool(d.metadata.get('include-binary', 'false')) or \
 453                    parse_bool(d.metadata.get(XMLNS_0COMPILE + ' include-binary', 'false')):
 454                         requires = addSimple(group, 'requires')
 455                         requires.setAttributeNS(None, 'interface', d.interface)
 456                         for b in d.bindings:
 457                                 if isinstance(b, model.EnvironmentBinding):
 458                                         env_elem = addSimple(requires, 'environment')
 459                                         env_elem.setAttributeNS(None, 'name', b.name)
 460                                         env_elem.setAttributeNS(None, 'insert', b.insert)
 461                                         if b.default:
 462                                                 env_elem.setAttributeNS(None, 'default', b.default)
 463                                 else:
 464                                         raise Exception('Unknown binding type ' + b)
 465                         close(requires)
 466
 467         impl_elem = addSimple(group, 'implementation')
 468         impl_template = buildenv.get_binary_template()
 469         if impl_template:
 470                 # Copy attributes from template
 471                 for fullname, value in impl_template.attrs.iteritems():
 472                         if fullname == 'arch' and value == '*-*': continue
 473                         if ' ' in fullname:
 474                                 ns, localName = fullname.split(' ', 1)
 475                         else:
 476                                 ns, localName = None, fullname
 477                         prefixes.setAttributeNS(impl_elem, ns, localName, value)
 478                 # Copy child nodes
 479                 for child in impl_template.childNodes:
 480                         impl_elem.appendChild(child.toDOM(doc, prefixes))
 481                 if impl_template.content:
 482                         impl_elem.appendChild(doc.createTextNode(impl_template.content))
 483
 484         impl_elem.setAttributeNS(None, 'version', src_impl.version)
 485
 486         version_modifier = buildenv.version_modifier
 487         if version_modifier:
 488                 impl_elem.setAttributeNS(None, 'version-modifier', version_modifier)
 489
 490         impl_elem.setAttributeNS(None, 'id', '..')
 491         impl_elem.setAttributeNS(None, 'released', time.strftime('%Y-%m-%d'))
 492         close(group)
 493         close(root)
 494
 495         for ns, prefix in prefixes.prefixes.items():
 496                 root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns:' + prefix, ns)
 497
 498         stream = codecs.open(path, 'w', encoding = 'utf-8')
 499         try:
 500                 doc.writexml(stream)
 501         finally:
 502                 stream.close()
 503
 504 def find_broken_version_symlinks(libdir, mappings):
 505         """libdir may be a legacy -devel package containing lib* symlinks whose
 506         targets would be provided by the corresponding runtime package. If so,
 507         create fixed symlinks under $TMPDIR with the real location."""
 508         prefix = 'lib'
 509         if sys.platform == 'darwin':
 510                 extension = '.dylib'
 511         else:
 512                 extension = '.so'
 513
 514         for x in os.listdir(libdir):
 515                 if x.startswith(prefix) and x.endswith(extension):
 516                         path = os.path.join(libdir, x)
 517                         if os.path.islink(path):
 518                                 target = os.readlink(path)
 519                                 if '/' not in target and not os.path.exists(os.path.join(libdir, target)):
 520                                         print "Broken link %s -> %s; will relocate..." % (x, target)
 521                                         mappings[x[len(prefix):-len(extension)]] = target
 522
 523 def set_up_mappings(mappings):
 524         """Create a temporary directory with symlinks for each of the library mappings."""
 525         libdirs = []
 526         if sys.platform == 'darwin':
 527                 LD_LIBRARY_PATH='DYLD_LIBRARY_PATH'
 528         else:
 529                 LD_LIBRARY_PATH='LD_LIBRARY_PATH'
 530         for d in os.environ.get(LD_LIBRARY_PATH, '').split(':'):
 531                 if d: libdirs.append(d)
 532         libdirs += ['/lib', '/usr/lib']
 533
 534         def add_ldconf(config_file):
 535                 if not os.path.isfile(config_file):
 536                         return
 537                 for line in file(config_file):
 538                         d = line.strip()
 539                         if d.startswith('include '):
 540                                 glob_pattern = d.split(' ', 1)[1]
 541                                 for conf in glob.glob(glob_pattern):
 542                                         add_ldconf(conf)
 543                         elif d and not d.startswith('#'):
 544                                 libdirs.append(d)
 545         add_ldconf('/etc/ld.so.conf')
 546
 547         def find_library(name, wanted):
 548                 # Takes a short-name and target name of a library and returns
 549                 # the full path of the library.
 550                 for d in libdirs:
 551                         path = os.path.join(d, wanted)
 552                         if os.path.exists(path):
 553                                 return path
 554                 print "WARNING: library '%s' not found (searched '%s')!" % (wanted, libdirs)
 555                 return None
 556
 557         mappings_dir = os.path.join(os.environ['TMPDIR'], 'lib-mappings')
 558         os.mkdir(mappings_dir)
 559
 560         old_path = os.environ.get('LIBRARY_PATH', '')
 561         if old_path: old_path = ':' + old_path
 562         os.environ['LIBRARY_PATH'] = mappings_dir + old_path
 563
 564         if sys.platform == 'darwin':
 565                 soext='.dylib'
 566         else:
 567                 soext='.so'
 568         for name, wanted in mappings.items():
 569                 target = find_library(name, wanted)
 570                 if target:
 571                         print "Adding mapping lib%s%s -> %s" % (name, soext, target)
 572                         os.symlink(target, os.path.join(mappings_dir, 'lib' + name + soext))
 573
 574 def dup_src(fn):
 575         srcdir = os.environ['SRCDIR'] + '/'
 576         for root, dirs, files in os.walk(srcdir):
 577                 assert root.startswith(srcdir)
 578                 reldir = root[len(srcdir):]
 579                 for f in files:
 580                         target = os.path.join(reldir, f)
 581                         #print "Copy %s -> %s" % (os.path.join(root, f), target)
 582                         if os.path.exists(target):
 583                                 os.unlink(target)
 584                         fn(os.path.join(root, f), target)
 585                 for d in dirs:
 586                         target = os.path.join(reldir, d)
 587                         if not os.path.isdir(target):
 588                                 os.mkdir(target)
 589
 590 __main__.commands.append(do_build)