1 """SCons.Script.SConscript
3 This module defines the Python API provided to SConscript and SConstruct
11 # Permission is hereby granted, free of charge, to any person obtaining
12 # a copy of this software and associated documentation files (the
13 # "Software"), to deal in the Software without restriction, including
14 # without limitation the rights to use, copy, modify, merge, publish,
15 # distribute, sublicense, and/or sell copies of the Software, and to
16 # permit persons to whom the Software is furnished to do so, subject to
17 # the following conditions:
19 # The above copyright notice and this permission notice shall be included
20 # in all copies or substantial portions of the Software.
22 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
23 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
24 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
26 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 from __future__ import generators ### KEEP FOR COMPATIBILITY FIXERS
32 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
38 import SCons.Environment
41 import SCons.Node.Alias
45 import SCons.Script.Main
57 # The following variables used to live in this module. Some
58 # SConscript files out there may have referred to them directly as
59 # SCons.Script.SConscript.*. This is now supported by some special
60 # handling towards the bottom of the SConscript.__init__.py module.
63 #BuildTargets = TargetList()
64 #CommandLineTargets = []
67 class SConscriptReturn(Exception):
70 launch_dir = os.path.abspath(os.curdir)
74 # global exports set by Export():
80 def get_calling_namespaces():
81 """Return the locals and globals for the function that called
82 into this module in the current call stack."""
84 except ZeroDivisionError:
85 # Don't start iterating with the current stack-frame to
86 # prevent creating reference cycles (f_back is safe).
87 frame = sys.exc_info()[2].tb_frame.f_back
89 # Find the first frame that *isn't* from this file. This means
90 # that we expect all of the SCons frames that implement an Export()
91 # or SConscript() call to be in this file, so that we can identify
92 # the first non-Script.SConscript frame as the user's local calling
93 # environment, and the locals and globals dictionaries from that
94 # frame as the calling namespaces. See the comment below preceding
95 # the DefaultEnvironmentCall block for even more explanation.
96 while frame.f_globals.get("__name__") == __name__:
99 return frame.f_locals, frame.f_globals
102 def compute_exports(exports):
103 """Compute a dictionary of exports given one of the parameters
104 to the Export() function or the exports argument to SConscript()."""
106 loc, glob = get_calling_namespaces()
110 for export in exports:
111 if SCons.Util.is_Dict(export):
112 retval.update(export)
115 retval[export] = loc[export]
117 retval[export] = glob[export]
119 raise SCons.Errors.UserError, "Export of non-existent variable '%s'"%x
124 """A frame on the SConstruct/SConscript call stack"""
125 def __init__(self, fs, exports, sconscript):
126 self.globals = BuildDefaultGlobals()
128 self.prev_dir = fs.getcwd()
129 self.exports = compute_exports(exports) # exports from the calling SConscript
130 # make sure the sconscript attr is a Node.
131 if isinstance(sconscript, SCons.Node.Node):
132 self.sconscript = sconscript
133 elif sconscript == '-':
134 self.sconscript = None
136 self.sconscript = fs.File(str(sconscript))
138 # the SConstruct/SConscript call stack:
141 # For documentation on the methods in this file, see the scons man-page
143 def Return(*vars, **kw):
146 fvars = SCons.Util.flatten(vars)
148 for v in var.split():
149 retval.append(call_stack[-1].globals[v])
151 raise SCons.Errors.UserError, "Return of non-existent variable '%s'"%x
154 call_stack[-1].retval = retval[0]
156 call_stack[-1].retval = tuple(retval)
158 stop = kw.get('stop', True)
161 raise SConscriptReturn
164 stack_bottom = '% Stack boTTom %' # hard to define a variable w/this name :)
166 def _SConscript(fs, *files, **kw):
168 sd = fs.SConstruct_dir.rdir()
169 exports = kw.get('exports', [])
171 # evaluate each SConscript file
174 call_stack.append(Frame(fs, exports, fn))
175 old_sys_path = sys.path
177 SCons.Script.sconscript_reading = SCons.Script.sconscript_reading + 1
179 exec sys.stdin in call_stack[-1].globals
181 if isinstance(fn, SCons.Node.Node):
187 # Change directory to the top of the source
188 # tree to make sure the os's cwd and the cwd of
189 # fs match so we can open the SConscript.
190 fs.chdir(top, change_os_dir=1)
193 _file_ = open(actual.get_abspath(), "r")
194 elif f.srcnode().rexists():
195 actual = f.srcnode().rfile()
196 _file_ = open(actual.get_abspath(), "r")
197 elif f.has_src_builder():
198 # The SConscript file apparently exists in a source
199 # code management system. Build it, but then clear
200 # the builder so that it doesn't get built *again*
201 # during the actual build phase.
206 _file_ = open(f.get_abspath(), "r")
208 # Chdir to the SConscript directory. Use a path
209 # name relative to the SConstruct file so that if
210 # we're using the -f option, we're essentially
211 # creating a parallel SConscript directory structure
212 # in our local directory tree.
214 # XXX This is broken for multiple-repository cases
215 # where the SConstruct and SConscript files might be
216 # in different Repositories. For now, cross that
217 # bridge when someone comes to it.
219 src_dir = kw['src_dir']
221 ldir = fs.Dir(f.dir.get_path(sd))
223 ldir = fs.Dir(src_dir)
224 if not ldir.is_under(f.dir):
225 # They specified a source directory, but
226 # it's above the SConscript directory.
227 # Do the sensible thing and just use the
228 # SConcript directory.
229 ldir = fs.Dir(f.dir.get_path(sd))
231 fs.chdir(ldir, change_os_dir=sconscript_chdir)
233 # There was no local directory, so we should be
234 # able to chdir to the Repository directory.
235 # Note that we do this directly, not through
236 # fs.chdir(), because we still need to
237 # interpret the stuff within the SConscript file
238 # relative to where we are logically.
239 fs.chdir(ldir, change_os_dir=0)
240 os.chdir(actual.dir.get_abspath())
242 # Append the SConscript directory to the beginning
243 # of sys.path so Python modules in the SConscript
244 # directory can be easily imported.
245 sys.path = [ f.dir.get_abspath() ] + sys.path
247 # This is the magic line that actually reads up
248 # and executes the stuff in the SConscript file.
249 # The locals for this frame contain the special
250 # bottom-of-the-stack marker so that any
251 # exceptions that occur when processing this
252 # SConscript can base the printed frames at this
253 # level and not show SCons internals as well.
254 call_stack[-1].globals.update({stack_bottom:1})
255 old_file = call_stack[-1].globals.get('__file__')
257 del call_stack[-1].globals['__file__']
262 exec _file_ in call_stack[-1].globals
263 except SConscriptReturn:
266 if old_file is not None:
267 call_stack[-1].globals.update({__file__:old_file})
269 SCons.Warnings.warn(SCons.Warnings.MissingSConscriptWarning,
270 "Ignoring missing SConscript '%s'" % f.path)
273 SCons.Script.sconscript_reading = SCons.Script.sconscript_reading - 1
274 sys.path = old_sys_path
275 frame = call_stack.pop()
277 fs.chdir(frame.prev_dir, change_os_dir=sconscript_chdir)
279 # There was no local directory, so chdir to the
280 # Repository directory. Like above, we do this
282 fs.chdir(frame.prev_dir, change_os_dir=0)
283 rdir = frame.prev_dir.rdir()
284 rdir._create() # Make sure there's a directory there.
286 os.chdir(rdir.get_abspath())
288 # We still couldn't chdir there, so raise the error,
289 # but only if actions are being executed.
291 # If the -n option was used, the directory would *not*
292 # have been created and we should just carry on and
293 # let things muddle through. This isn't guaranteed
294 # to work if the SConscript files are reading things
295 # from disk (for example), but it should work well
296 # enough for most configurations.
297 if SCons.Action.execute_actions:
300 results.append(frame.retval)
302 # if we only have one script, don't return a tuple
303 if len(results) == 1:
306 return tuple(results)
308 def SConscript_exception(file=sys.stderr):
309 """Print an exception stack trace just for the SConscript file(s).
310 This will show users who have Python errors where the problem is,
311 without cluttering the output with all of the internal calls leading
312 up to where we exec the SConscript."""
313 exc_type, exc_value, exc_tb = sys.exc_info()
315 while tb and stack_bottom not in tb.tb_frame.f_locals:
318 # We did not find our exec statement, so this was actually a bug
319 # in SCons itself. Show the whole stack.
321 stack = traceback.extract_tb(tb)
323 type = exc_type.__name__
324 except AttributeError:
326 if type[:11] == "exceptions.":
328 file.write('%s: %s:\n' % (type, exc_value))
329 for fname, line, func, text in stack:
330 file.write(' File "%s", line %d:\n' % (fname, line))
331 file.write(' %s\n' % text)
334 """Annotate a node with the stack frame describing the
335 SConscript file and line number that created it."""
336 tb = sys.exc_info()[2]
337 while tb and stack_bottom not in tb.tb_frame.f_locals:
340 # We did not find any exec of an SConscript file: what?!
341 raise SCons.Errors.InternalError, "could not find SConscript stack frame"
342 node.creator = traceback.extract_stack(tb)[0]
344 # The following line would cause each Node to be annotated using the
345 # above function. Unfortunately, this is a *huge* performance hit, so
346 # leave this disabled until we find a more efficient mechanism.
347 #SCons.Node.Annotate = annotate
349 class SConsEnvironment(SCons.Environment.Base):
350 """An Environment subclass that contains all of the methods that
351 are particular to the wrapper SCons interface and which aren't
352 (or shouldn't be) part of the build engine itself.
354 Note that not all of the methods of this class have corresponding
355 global functions, there are some private methods.
359 # Private methods of an SConsEnvironment.
361 def _exceeds_version(self, major, minor, v_major, v_minor):
362 """Return 1 if 'major' and 'minor' are greater than the version
363 in 'v_major' and 'v_minor', and 0 otherwise."""
364 return (major > v_major or (major == v_major and minor > v_minor))
366 def _get_major_minor_revision(self, version_string):
367 """Split a version string into major, minor and (optionally)
370 This is complicated by the fact that a version string can be
371 something like 3.2b1."""
372 version = version_string.split(' ')[0].split('.')
373 v_major = int(version[0])
374 v_minor = int(re.match('\d+', version[1]).group())
375 if len(version) >= 3:
376 v_revision = int(re.match('\d+', version[2]).group())
379 return v_major, v_minor, v_revision
381 def _get_SConscript_filenames(self, ls, kw):
383 Convert the parameters passed to # SConscript() calls into a list
384 of files and export variables. If the parameters are invalid,
385 throws SCons.Errors.UserError. Returns a tuple (l, e) where l
386 is a list of SConscript filenames and e is a list of exports.
394 raise SCons.Errors.UserError, \
395 "Invalid SConscript usage - no parameters"
397 if not SCons.Util.is_List(dirs):
399 dirs = list(map(str, dirs))
401 name = kw.get('name', 'SConscript')
403 files = [os.path.join(n, name) for n in dirs]
412 exports = self.Split(ls[1])
416 raise SCons.Errors.UserError, \
417 "Invalid SConscript() usage - too many arguments"
419 if not SCons.Util.is_List(files):
422 if kw.get('exports'):
423 exports.extend(self.Split(kw['exports']))
425 variant_dir = kw.get('variant_dir') or kw.get('build_dir')
428 raise SCons.Errors.UserError, \
429 "Invalid SConscript() usage - can only specify one SConscript with a variant_dir"
430 duplicate = kw.get('duplicate', 1)
431 src_dir = kw.get('src_dir')
433 src_dir, fname = os.path.split(str(files[0]))
434 files = [os.path.join(str(variant_dir), fname)]
436 if not isinstance(src_dir, SCons.Node.Node):
437 src_dir = self.fs.Dir(src_dir)
439 if not isinstance(fn, SCons.Node.Node):
440 fn = self.fs.File(fn)
441 if fn.is_under(src_dir):
442 # Get path relative to the source directory.
443 fname = fn.get_path(src_dir)
444 files = [os.path.join(str(variant_dir), fname)]
447 kw['src_dir'] = variant_dir
448 self.fs.VariantDir(variant_dir, src_dir, duplicate)
450 return (files, exports)
453 # Public methods of an SConsEnvironment. These get
454 # entry points in the global name space so they can be called
455 # as global functions.
458 def Configure(self, *args, **kw):
459 if not SCons.Script.sconscript_reading:
460 raise SCons.Errors.UserError, "Calling Configure from Builders is not supported."
461 kw['_depth'] = kw.get('_depth', 0) + 1
462 return SCons.Environment.Base.Configure(self, *args, **kw)
464 def Default(self, *targets):
465 SCons.Script._Set_Default_Targets(self, targets)
467 def EnsureSConsVersion(self, major, minor, revision=0):
468 """Exit abnormally if the SCons version is not late enough."""
469 scons_ver = self._get_major_minor_revision(SCons.__version__)
470 if scons_ver < (major, minor, revision):
472 scons_ver_string = '%d.%d.%d' % (major, minor, revision)
474 scons_ver_string = '%d.%d' % (major, minor)
475 print "SCons %s or greater required, but you have SCons %s" % \
476 (scons_ver_string, SCons.__version__)
479 def EnsurePythonVersion(self, major, minor):
480 """Exit abnormally if the Python version is not late enough."""
482 v_major, v_minor, v_micro, release, serial = sys.version_info
483 python_ver = (v_major, v_minor)
484 except AttributeError:
485 python_ver = self._get_major_minor_revision(sys.version)[:2]
486 if python_ver < (major, minor):
487 v = sys.version.split(" ", 1)[0]
488 print "Python %d.%d or greater required, but you have Python %s" %(major,minor,v)
491 def Exit(self, value=0):
494 def Export(self, *vars, **kw):
496 global_exports.update(compute_exports(self.Split(var)))
497 global_exports.update(kw)
499 def GetLaunchDir(self):
503 def GetOption(self, name):
504 name = self.subst(name)
505 return SCons.Script.Main.GetOption(name)
507 def Help(self, text):
508 text = self.subst(text, raw=1)
509 SCons.Script.HelpFunction(text)
511 def Import(self, *vars):
513 frame = call_stack[-1]
514 globals = frame.globals
515 exports = frame.exports
517 var = self.Split(var)
520 globals.update(global_exports)
521 globals.update(exports)
524 globals[v] = exports[v]
526 globals[v] = global_exports[v]
528 raise SCons.Errors.UserError, "Import of non-existent variable '%s'"%x
530 def SConscript(self, *ls, **kw):
531 def subst_element(x, subst=self.subst):
532 if SCons.Util.is_List(x):
533 x = list(map(subst, x))
537 ls = list(map(subst_element, ls))
539 for key, val in kw.items():
540 if SCons.Util.is_String(val):
541 val = self.subst(val)
542 elif SCons.Util.is_List(val):
545 if SCons.Util.is_String(v):
551 files, exports = self._get_SConscript_filenames(ls, subst_kw)
552 subst_kw['exports'] = exports
553 return _SConscript(self.fs, *files, **subst_kw)
555 def SConscriptChdir(self, flag):
556 global sconscript_chdir
557 sconscript_chdir = flag
559 def SetOption(self, name, value):
560 name = self.subst(name)
561 SCons.Script.Main.SetOption(name, value)
566 SCons.Environment.Environment = SConsEnvironment
568 def Configure(*args, **kw):
569 if not SCons.Script.sconscript_reading:
570 raise SCons.Errors.UserError, "Calling Configure from Builders is not supported."
572 return SCons.SConf.SConf(*args, **kw)
574 # It's very important that the DefaultEnvironmentCall() class stay in this
575 # file, with the get_calling_namespaces() function, the compute_exports()
576 # function, the Frame class and the SConsEnvironment.Export() method.
577 # These things make up the calling stack leading up to the actual global
578 # Export() or SConscript() call that the user issued. We want to allow
579 # users to export local variables that they define, like so:
585 # To support this, the get_calling_namespaces() function assumes that
586 # the *first* stack frame that's not from this file is the local frame
587 # for the Export() or SConscript() call.
589 _DefaultEnvironmentProxy = None
591 def get_DefaultEnvironmentProxy():
592 global _DefaultEnvironmentProxy
593 if not _DefaultEnvironmentProxy:
594 default_env = SCons.Defaults.DefaultEnvironment()
595 _DefaultEnvironmentProxy = SCons.Environment.NoSubstitutionProxy(default_env)
596 return _DefaultEnvironmentProxy
598 class DefaultEnvironmentCall:
599 """A class that implements "global function" calls of
600 Environment methods by fetching the specified method from the
601 DefaultEnvironment's class. Note that this uses an intermediate
602 proxy class instead of calling the DefaultEnvironment method
603 directly so that the proxy can override the subst() method and
604 thereby prevent expansion of construction variables (since from
605 the user's point of view this was called as a global function,
606 with no associated construction environment)."""
607 def __init__(self, method_name, subst=0):
608 self.method_name = method_name
610 self.factory = SCons.Defaults.DefaultEnvironment
612 self.factory = get_DefaultEnvironmentProxy
613 def __call__(self, *args, **kw):
615 method = getattr(env, self.method_name)
616 return method(*args, **kw)
619 def BuildDefaultGlobals():
621 Create a dictionary containing all the default globals for
622 SConstruct and SConscript files.
626 if GlobalDict is None:
630 d = SCons.Script.__dict__
631 def not_a_module(m, d=d, mtype=type(SCons.Script)):
632 return type(d[m]) != mtype
633 for m in filter(not_a_module, dir(SCons.Script)):
636 return GlobalDict.copy()
640 # indent-tabs-mode:nil
642 # vim: set expandtab tabstop=4 shiftwidth=4: