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
  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 = buildenv.get_selections().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                 command = src_impl.attrs[XMLNS_0COMPILE + ' command']
 283
 284                 # Remove any existing log files
 285                 for log in ['build.log', 'build-success.log', 'build-failure.log']:
 286                         if os.path.exists(log):
 287                                 os.unlink(log)
 288
 289                 # Run the command, copying output to a new log
 290                 log = file('build.log', 'w')
 291                 try:
 292                         print >>log, "Build log for %s-%s" % (src_iface.get_name(),
 293                                                               src_impl.version)
 294                         print >>log, "\nBuilt using 0compile-%s" % __main__.version
 295                         print >>log, "\nBuild system: " + ', '.join(uname)
 296                         print >>log, "\n%s:\n" % ENV_FILE
 297                         shutil.copyfileobj(file("../" + ENV_FILE), log)
 298
 299                         log.write('\n')
 300
 301                         if os.path.exists(patch_file):
 302                                 print >>log, "\nPatched with:\n"
 303                                 shutil.copyfileobj(file(patch_file), log)
 304                                 log.write('\n')
 305
 306                         print "Executing: " + command
 307                         print >>log, "Executing: " + command
 308
 309                         # Tee the output to the console and to the log
 310                         child = subprocess.Popen(command, shell = True, stdout = subprocess.PIPE, stderr = subprocess.STDOUT)
 311                         while True:
 312                                 data = os.read(child.stdout.fileno(), 100)
 313                                 if not data: break
 314                                 sys.stdout.write(data)
 315                                 log.write(data)
 316                         status = child.wait()
 317                         failure = None
 318                         if status == 0:
 319                                 print >>log, "Build successful"
 320                                 fixup_generated_pkgconfig_files()
 321                                 remove_la_files()
 322                         elif status > 0:
 323                                 failure = "Build failed with exit code %d" % status
 324                         else:
 325                                 failure = "Build failure: exited due to signal %d" % (-status)
 326                         if failure:
 327                                 print >>log, failure
 328                                 os.rename('build.log', 'build-failure.log')
 329                                 raise SafeException("Command '%s': %s" % (command, failure))
 330                         else:
 331                                 os.rename('build.log', 'build-success.log')
 332                 finally:
 333                         log.close()
 334
 335 def do_build(args):
 336         """build [ --no-sandbox ] [ --shell | --force | --clean ]"""
 337         buildenv = BuildEnv()
 338         sels = buildenv.get_selections()
 339
 340         parser = OptionParser(usage="usage: %prog build [options]")
 341
 342         parser.add_option('', "--no-sandbox", help="disable use of sandboxing", action='store_true')
 343         parser.add_option("-s", "--shell", help="run a shell instead of building", action='store_true')
 344         parser.add_option("-c", "--clean", help="remove the build directories", action='store_true')
 345         parser.add_option("-f", "--force", help="build even if dependencies have changed", action='store_true')
 346
 347         parser.disable_interspersed_args()
 348
 349         (options, args2) = parser.parse_args(args)
 350
 351         builddir = os.path.realpath('build')
 352
 353         changes = buildenv.get_build_changes()
 354         if changes:
 355                 if not (options.force or options.clean):
 356                         raise SafeException("Build dependencies have changed:\n" +
 357                                         '\n'.join(changes) + "\n\n" +
 358                                         "To build anyway, use: 0compile build --force\n" +
 359                                         "To do a clean build:  0compile build --clean")
 360                 if not options.no_sandbox:
 361                         print "Build dependencies have changed:\n" + '\n'.join(changes)
 362
 363         ensure_dir(builddir, options.clean)
 364         ensure_dir(buildenv.distdir, options.clean)
 365
 366         if options.no_sandbox:
 367                 return do_build_internal(options, args2)
 368
 369         tmpdir = tempfile.mkdtemp(prefix = '0compile-')
 370         try:
 371                 my_dir = os.path.dirname(__file__)
 372                 readable = ['.', my_dir]
 373                 writable = ['build', buildenv.distdir, tmpdir]
 374                 env('TMPDIR', tmpdir)
 375
 376                 for selection in sels.selections.values():
 377                         if not is_package_impl(selection):
 378                                 readable.append(lookup(selection))
 379
 380                 options = []
 381                 if __main__.options.verbose:
 382                         options.append('--verbose')
 383
 384                 readable.append('/etc') # /etc/ld.*
 385
 386                 spawn_maybe_sandboxed(readable, writable, tmpdir, sys.executable, ['-u', sys.argv[0]] + options + ['build', '--no-sandbox'] + args)
 387         finally:
 388                 info("Deleting temporary directory '%s'" % tmpdir)
 389                 shutil.rmtree(tmpdir)
 390
 391 def write_sample_interface(buildenv, iface, src_impl):
 392         path = buildenv.local_iface_file
 393         target_arch = buildenv.target_arch
 394
 395         impl = minidom.getDOMImplementation()
 396
 397         XMLNS_IFACE = namespaces.XMLNS_IFACE
 398
 399         doc = impl.createDocument(XMLNS_IFACE, "interface", None)
 400
 401         root = doc.documentElement
 402         root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns', XMLNS_IFACE)
 403
 404         def addSimple(parent, name, text = None):
 405                 elem = doc.createElementNS(XMLNS_IFACE, name)
 406
 407                 parent.appendChild(doc.createTextNode('\n' + '  ' * (1 + depth(parent))))
 408                 parent.appendChild(elem)
 409                 if text:
 410                         elem.appendChild(doc.createTextNode(text))
 411                 return elem
 412
 413         def close(element):
 414                 element.appendChild(doc.createTextNode('\n' + '  ' * depth(element)))
 415
 416         addSimple(root, 'name', iface.name)
 417         addSimple(root, 'summary', iface.summary)
 418         addSimple(root, 'description', iface.description)
 419         feed_for = addSimple(root, 'feed-for')
 420
 421         uri = iface.uri
 422         if uri.startswith('/'):
 423                 print "Note: source %s is a local feed" % iface.uri
 424                 for feed_uri in iface.feed_for or []:
 425                         uri = feed_uri
 426                         print "Will use <feed-for interface='%s'> instead..." % uri
 427                         break
 428                 else:
 429                         master_feed = minidom.parse(uri).documentElement
 430                         if master_feed.hasAttribute('uri'):
 431                                 uri = master_feed.getAttribute('uri')
 432                                 print "Will use <feed-for interface='%s'> instead..." % uri
 433
 434         feed_for.setAttributeNS(None, 'interface', uri)
 435
 436         group = addSimple(root, 'group')
 437         main = src_impl.attrs.get(XMLNS_0COMPILE + ' binary-main', None)
 438         if main:
 439                 group.setAttributeNS(None, 'main', main)
 440
 441         lib_mappings = src_impl.attrs.get(XMLNS_0COMPILE + ' binary-lib-mappings', None)
 442         if lib_mappings:
 443                 root.setAttributeNS(XMLNS_NAMESPACE, 'xmlns:compile', XMLNS_0COMPILE)
 444                 group.setAttributeNS(XMLNS_0COMPILE, 'compile:lib-mappings', lib_mappings)
 445
 446         for d in src_impl.dependencies:
 447                 # 0launch < 0.32 messed up the namespace...
 448                 if parse_bool(d.metadata.get('include-binary', 'false')) or \
 449                    parse_bool(d.metadata.get(XMLNS_0COMPILE + ' include-binary', 'false')):
 450                         requires = addSimple(group, 'requires')
 451                         requires.setAttributeNS(None, 'interface', d.interface)
 452                         for b in d.bindings:
 453                                 if isinstance(b, model.EnvironmentBinding):
 454                                         env_elem = addSimple(requires, 'environment')
 455                                         env_elem.setAttributeNS(None, 'name', b.name)
 456                                         env_elem.setAttributeNS(None, 'insert', b.insert)
 457                                         if b.default:
 458                                                 env_elem.setAttributeNS(None, 'default', b.default)
 459                                 else:
 460                                         raise Exception('Unknown binding type ' + b)
 461                         close(requires)
 462
 463         group.setAttributeNS(None, 'arch', target_arch)
 464         impl_elem = addSimple(group, 'implementation')
 465         impl_elem.setAttributeNS(None, 'version', src_impl.version)
 466
 467         version_modifier = buildenv.version_modifier
 468         if version_modifier:
 469                 impl_elem.setAttributeNS(None, 'version-modifier', version_modifier)
 470
 471         impl_elem.setAttributeNS(None, 'id', '..')
 472         impl_elem.setAttributeNS(None, 'released', time.strftime('%Y-%m-%d'))
 473         close(group)
 474         close(root)
 475
 476         stream = codecs.open(path, 'w', encoding = 'utf-8')
 477         try:
 478                 doc.writexml(stream)
 479         finally:
 480                 stream.close()
 481
 482 def find_broken_version_symlinks(libdir, mappings):
 483         """libdir may be a legacy -devel package containing lib* symlinks whose
 484         targets would be provided by the corresponding runtime package. If so,
 485         create fixed symlinks under $TMPDIR with the real location."""
 486         prefix = 'lib'
 487         if sys.platform == 'darwin':
 488                 extension = '.dylib'
 489         else:
 490                 extension = '.so'
 491
 492         for x in os.listdir(libdir):
 493                 if x.startswith(prefix) and x.endswith(extension):
 494                         path = os.path.join(libdir, x)
 495                         if os.path.islink(path):
 496                                 target = os.readlink(path)
 497                                 if '/' not in target and not os.path.exists(os.path.join(libdir, target)):
 498                                         print "Broken link %s -> %s; will relocate..." % (x, target)
 499                                         mappings[x[len(prefix):-len(extension)]] = target
 500
 501 def set_up_mappings(mappings):
 502         """Create a temporary directory with symlinks for each of the library mappings."""
 503         libdirs = []
 504         if sys.platform == 'darwin':
 505                 LD_LIBRARY_PATH='DYLD_LIBRARY_PATH'
 506         else:
 507                 LD_LIBRARY_PATH='LD_LIBRARY_PATH'
 508         for d in os.environ.get(LD_LIBRARY_PATH, '').split(':'):
 509                 if d: libdirs.append(d)
 510         libdirs += ['/lib', '/usr/lib']
 511
 512         def add_ldconf(config_file):
 513                 if not os.path.isfile(config_file):
 514                         return
 515                 for line in file(config_file):
 516                         d = line.strip()
 517                         if d.startswith('include '):
 518                                 glob_pattern = d.split(' ', 1)[1]
 519                                 for conf in glob.glob(glob_pattern):
 520                                         add_ldconf(conf)
 521                         elif d and not d.startswith('#'):
 522                                 libdirs.append(d)
 523         add_ldconf('/etc/ld.so.conf')
 524
 525         def find_library(name, wanted):
 526                 # Takes a short-name and target name of a library and returns
 527                 # the full path of the library.
 528                 for d in libdirs:
 529                         path = os.path.join(d, wanted)
 530                         if os.path.exists(path):
 531                                 return path
 532                 print "WARNING: library '%s' not found (searched '%s')!" % (wanted, libdirs)
 533                 return None
 534
 535         mappings_dir = os.path.join(os.environ['TMPDIR'], 'lib-mappings')
 536         os.mkdir(mappings_dir)
 537
 538         old_path = os.environ.get('LIBRARY_PATH', '')
 539         if old_path: old_path = ':' + old_path
 540         os.environ['LIBRARY_PATH'] = mappings_dir + old_path
 541
 542         if sys.platform == 'darwin':
 543                 soext='.dylib'
 544         else:
 545                 soext='.so'
 546         for name, wanted in mappings.items():
 547                 target = find_library(name, wanted)
 548                 if target:
 549                         print "Adding mapping lib%s%s -> %s" % (name, soext, target)
 550                         os.symlink(target, os.path.join(mappings_dir, 'lib' + name + soext))
 551
 552 def dup_src(fn):
 553         srcdir = os.environ['SRCDIR'] + '/'
 554         for root, dirs, files in os.walk(srcdir):
 555                 assert root.startswith(srcdir)
 556                 reldir = root[len(srcdir):]
 557                 for f in files:
 558                         target = os.path.join(reldir, f)
 559                         #print "Copy %s -> %s" % (os.path.join(root, f), target)
 560                         if os.path.exists(target):
 561                                 os.unlink(target)
 562                         fn(os.path.join(root, f), target)
 563                 for d in dirs:
 564                         target = os.path.join(reldir, d)
 565                         if not os.path.isdir(target):
 566                                 os.mkdir(target)
 567
 568 __main__.commands.append(do_build)