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1 """SCons.Script.SConscript
2
3 This module defines the Python API provided to SConscript and SConstruct
4 files.
5
6 """
7
8 #
9 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 The SCons Foundation
10 #
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:
18 #
19 # The above copyright notice and this permission notice shall be included
20 # in all copies or substantial portions of the Software.
21 #
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.
29 from __future__ import division
30
31 __revision__ = "src/engine/SCons/Script/SConscript.py 5023 2010/06/14 22:05:46 scons"
32
33 import SCons
34 import SCons.Action
35 import SCons.Builder
36 import SCons.Defaults
37 import SCons.Environment
38 import SCons.Errors
39 import SCons.Node
40 import SCons.Node.Alias
41 import SCons.Node.FS
42 import SCons.Platform
43 import SCons.SConf
44 import SCons.Script.Main
45 import SCons.Tool
46 import SCons.Util
47
48 import collections
49 import os
50 import os.path
51 import re
52 import sys
53 import traceback
54
55 # The following variables used to live in this module. Some
56 # SConscript files out there may have referred to them directly as
57 # SCons.Script.SConscript.*. This is now supported by some special
58 # handling towards the bottom of the SConscript.__init__.py module.
59 #Arguments = {}
60 #ArgList = []
61 #BuildTargets = TargetList()
62 #CommandLineTargets = []
63 #DefaultTargets = []
64
67
68 launch_dir = os.path.abspath(os.curdir)
69
70 GlobalDict = None
71
72 # global exports set by Export():
73 global_exports = {}
74
75 # chdir flag
76 sconscript_chdir = 1
77
79 """Return the locals and globals for the function that called
80 into this module in the current call stack."""
81 try: 1//0
82 except ZeroDivisionError:
83 # Don't start iterating with the current stack-frame to
84 # prevent creating reference cycles (f_back is safe).
85 frame = sys.exc_info()[2].tb_frame.f_back
86
87 # Find the first frame that *isn't* from this file. This means
88 # that we expect all of the SCons frames that implement an Export()
89 # or SConscript() call to be in this file, so that we can identify
90 # the first non-Script.SConscript frame as the user's local calling
91 # environment, and the locals and globals dictionaries from that
92 # frame as the calling namespaces. See the comment below preceding
93 # the DefaultEnvironmentCall block for even more explanation.
94 while frame.f_globals.get("__name__") == __name__:
95 frame = frame.f_back
96
97 return frame.f_locals, frame.f_globals
98
99
101 """Compute a dictionary of exports given one of the parameters
102 to the Export() function or the exports argument to SConscript()."""
103
104 loc, glob = get_calling_namespaces()
105
106 retval = {}
107 try:
108 for export in exports:
109 if SCons.Util.is_Dict(export):
110 retval.update(export)
111 else:
112 try:
113 retval[export] = loc[export]
114 except KeyError:
115 retval[export] = glob[export]
116 except KeyError, x:
117 raise SCons.Errors.UserError("Export of non-existent variable '%s'"%x)
118
119 return retval
120
122 """A frame on the SConstruct/SConscript call stack"""
124 self.globals = BuildDefaultGlobals()
125 self.retval = None
126 self.prev_dir = fs.getcwd()
127 self.exports = compute_exports(exports) # exports from the calling SConscript
128 # make sure the sconscript attr is a Node.
129 if isinstance(sconscript, SCons.Node.Node):
130 self.sconscript = sconscript
131 elif sconscript == '-':
132 self.sconscript = None
133 else:
134 self.sconscript = fs.File(str(sconscript))
135
136 # the SConstruct/SConscript call stack:
137 call_stack = []
138
139 # For documentation on the methods in this file, see the scons man-page
140
142 retval = []
143 try:
144 fvars = SCons.Util.flatten(vars)
145 for var in fvars:
146 for v in var.split():
147 retval.append(call_stack[-1].globals[v])
148 except KeyError, x:
149 raise SCons.Errors.UserError("Return of non-existent variable '%s'"%x)
150
151 if len(retval) == 1:
152 call_stack[-1].retval = retval[0]
153 else:
154 call_stack[-1].retval = tuple(retval)
155
156 stop = kw.get('stop', True)
157
158 if stop:
159 raise SConscriptReturn
160
161
162 stack_bottom = '% Stack boTTom %' # hard to define a variable w/this name :)
163
165 top = fs.Top
166 sd = fs.SConstruct_dir.rdir()
167 exports = kw.get('exports', [])
168
169 # evaluate each SConscript file
170 results = []
171 for fn in files:
172 call_stack.append(Frame(fs, exports, fn))
173 old_sys_path = sys.path
174 try:
175 SCons.Script.sconscript_reading = SCons.Script.sconscript_reading + 1
176 if fn == "-":
177 exec sys.stdin in call_stack[-1].globals
178 else:
179 if isinstance(fn, SCons.Node.Node):
180 f = fn
181 else:
182 f = fs.File(str(fn))
183 _file_ = None
184
185 # Change directory to the top of the source
186 # tree to make sure the os's cwd and the cwd of
187 # fs match so we can open the SConscript.
188 fs.chdir(top, change_os_dir=1)
189 if f.rexists():
190 actual = f.rfile()
191 _file_ = open(actual.get_abspath(), "r")
192 elif f.srcnode().rexists():
193 actual = f.srcnode().rfile()
194 _file_ = open(actual.get_abspath(), "r")
195 elif f.has_src_builder():
196 # The SConscript file apparently exists in a source
197 # code management system. Build it, but then clear
198 # the builder so that it doesn't get built *again*
199 # during the actual build phase.
200 f.build()
201 f.built()
202 f.builder_set(None)
203 if f.exists():
204 _file_ = open(f.get_abspath(), "r")
205 if _file_:
206 # Chdir to the SConscript directory. Use a path
207 # name relative to the SConstruct file so that if
208 # we're using the -f option, we're essentially
209 # creating a parallel SConscript directory structure
210 # in our local directory tree.
211 #
212 # XXX This is broken for multiple-repository cases
213 # where the SConstruct and SConscript files might be
214 # in different Repositories. For now, cross that
215 # bridge when someone comes to it.
216 try:
217 src_dir = kw['src_dir']
218 except KeyError:
219 ldir = fs.Dir(f.dir.get_path(sd))
220 else:
221 ldir = fs.Dir(src_dir)
222 if not ldir.is_under(f.dir):
223 # They specified a source directory, but
224 # it's above the SConscript directory.
225 # Do the sensible thing and just use the
226 # SConcript directory.
227 ldir = fs.Dir(f.dir.get_path(sd))
228 try:
229 fs.chdir(ldir, change_os_dir=sconscript_chdir)
230 except OSError:
231 # There was no local directory, so we should be
232 # able to chdir to the Repository directory.
233 # Note that we do this directly, not through
234 # fs.chdir(), because we still need to
235 # interpret the stuff within the SConscript file
236 # relative to where we are logically.
237 fs.chdir(ldir, change_os_dir=0)
238 os.chdir(actual.dir.get_abspath())
239
240 # Append the SConscript directory to the beginning
241 # of sys.path so Python modules in the SConscript
242 # directory can be easily imported.
243 sys.path = [ f.dir.get_abspath() ] + sys.path
244
245 # This is the magic line that actually reads up
246 # and executes the stuff in the SConscript file.
247 # The locals for this frame contain the special
248 # bottom-of-the-stack marker so that any
249 # exceptions that occur when processing this
250 # SConscript can base the printed frames at this
251 # level and not show SCons internals as well.
252 call_stack[-1].globals.update({stack_bottom:1})
253 old_file = call_stack[-1].globals.get('__file__')
254 try:
255 del call_stack[-1].globals['__file__']
256 except KeyError:
257 pass
258 try:
259 try:
260 exec _file_ in call_stack[-1].globals
261 except SConscriptReturn:
262 pass
263 finally:
264 if old_file is not None:
265 call_stack[-1].globals.update({__file__:old_file})
266 else:
267 SCons.Warnings.warn(SCons.Warnings.MissingSConscriptWarning,
268 "Ignoring missing SConscript '%s'" % f.path)
269
270 finally:
271 SCons.Script.sconscript_reading = SCons.Script.sconscript_reading - 1
272 sys.path = old_sys_path
273 frame = call_stack.pop()
274 try:
275 fs.chdir(frame.prev_dir, change_os_dir=sconscript_chdir)
276 except OSError:
277 # There was no local directory, so chdir to the
278 # Repository directory. Like above, we do this
279 # directly.
280 fs.chdir(frame.prev_dir, change_os_dir=0)
281 rdir = frame.prev_dir.rdir()
282 rdir._create() # Make sure there's a directory there.
283 try:
284 os.chdir(rdir.get_abspath())
285 except OSError, e:
286 # We still couldn't chdir there, so raise the error,
287 # but only if actions are being executed.
288 #
289 # If the -n option was used, the directory would *not*
290 # have been created and we should just carry on and
291 # let things muddle through. This isn't guaranteed
292 # to work if the SConscript files are reading things
293 # from disk (for example), but it should work well
294 # enough for most configurations.
295 if SCons.Action.execute_actions:
296 raise e
297
298 results.append(frame.retval)
299
300 # if we only have one script, don't return a tuple
301 if len(results) == 1:
302 return results[0]
303 else:
304 return tuple(results)
305
307 """Print an exception stack trace just for the SConscript file(s).
308 This will show users who have Python errors where the problem is,
309 without cluttering the output with all of the internal calls leading
310 up to where we exec the SConscript."""
311 exc_type, exc_value, exc_tb = sys.exc_info()
312 tb = exc_tb
313 while tb and stack_bottom not in tb.tb_frame.f_locals:
314 tb = tb.tb_next
315 if not tb:
316 # We did not find our exec statement, so this was actually a bug
317 # in SCons itself. Show the whole stack.
318 tb = exc_tb
319 stack = traceback.extract_tb(tb)
320 try:
321 type = exc_type.__name__
322 except AttributeError:
323 type = str(exc_type)
324 if type[:11] == "exceptions.":
325 type = type[11:]
326 file.write('%s: %s:\n' % (type, exc_value))
327 for fname, line, func, text in stack:
328 file.write(' File "%s", line %d:\n' % (fname, line))
329 file.write(' %s\n' % text)
330
332 """Annotate a node with the stack frame describing the
333 SConscript file and line number that created it."""
334 tb = sys.exc_info()[2]
335 while tb and stack_bottom not in tb.tb_frame.f_locals:
336 tb = tb.tb_next
337 if not tb:
338 # We did not find any exec of an SConscript file: what?!
339 raise SCons.Errors.InternalError("could not find SConscript stack frame")
340 node.creator = traceback.extract_stack(tb)[0]
341
342 # The following line would cause each Node to be annotated using the
343 # above function. Unfortunately, this is a *huge* performance hit, so
344 # leave this disabled until we find a more efficient mechanism.
345 #SCons.Node.Annotate = annotate
346
348 """An Environment subclass that contains all of the methods that
349 are particular to the wrapper SCons interface and which aren't
350 (or shouldn't be) part of the build engine itself.
351
352 Note that not all of the methods of this class have corresponding
353 global functions, there are some private methods.
354 """
355
356 #
357 # Private methods of an SConsEnvironment.
358 #
360 """Return 1 if 'major' and 'minor' are greater than the version
361 in 'v_major' and 'v_minor', and 0 otherwise."""
362 return (major > v_major or (major == v_major and minor > v_minor))
363
365 """Split a version string into major, minor and (optionally)
366 revision parts.
367
368 This is complicated by the fact that a version string can be
369 something like 3.2b1."""
370 version = version_string.split(' ')[0].split('.')
371 v_major = int(version[0])
372 v_minor = int(re.match('\d+', version[1]).group())
373 if len(version) >= 3:
374 v_revision = int(re.match('\d+', version[2]).group())
375 else:
376 v_revision = 0
377 return v_major, v_minor, v_revision
378
380 """
381 Convert the parameters passed to SConscript() calls into a list
382 of files and export variables. If the parameters are invalid,
383 throws SCons.Errors.UserError. Returns a tuple (l, e) where l
384 is a list of SConscript filenames and e is a list of exports.
385 """
386 exports = []
387
388 if len(ls) == 0:
389 try:
390 dirs = kw["dirs"]
391 except KeyError:
392 raise SCons.Errors.UserError("Invalid SConscript usage - no parameters")
393
394 if not SCons.Util.is_List(dirs):
395 dirs = [ dirs ]
396 dirs = list(map(str, dirs))
397
398 name = kw.get('name', 'SConscript')
399
400 files = [os.path.join(n, name) for n in dirs]
401
402 elif len(ls) == 1:
403
404 files = ls[0]
405
406 elif len(ls) == 2:
407
408 files = ls[0]
409 exports = self.Split(ls[1])
410
411 else:
412
413 raise SCons.Errors.UserError("Invalid SConscript() usage - too many arguments")
414
415 if not SCons.Util.is_List(files):
416 files = [ files ]
417
418 if kw.get('exports'):
419 exports.extend(self.Split(kw['exports']))
420
421 variant_dir = kw.get('variant_dir') or kw.get('build_dir')
422 if variant_dir:
423 if len(files) != 1:
424 raise SCons.Errors.UserError("Invalid SConscript() usage - can only specify one SConscript with a variant_dir")
425 duplicate = kw.get('duplicate', 1)
426 src_dir = kw.get('src_dir')
427 if not src_dir:
428 src_dir, fname = os.path.split(str(files[0]))
429 files = [os.path.join(str(variant_dir), fname)]
430 else:
431 if not isinstance(src_dir, SCons.Node.Node):
432 src_dir = self.fs.Dir(src_dir)
433 fn = files[0]
434 if not isinstance(fn, SCons.Node.Node):
435 fn = self.fs.File(fn)
436 if fn.is_under(src_dir):
437 # Get path relative to the source directory.
438 fname = fn.get_path(src_dir)
439 files = [os.path.join(str(variant_dir), fname)]
440 else:
441 files = [fn.abspath]
442 kw['src_dir'] = variant_dir
443 self.fs.VariantDir(variant_dir, src_dir, duplicate)
444
445 return (files, exports)
446
447 #
448 # Public methods of an SConsEnvironment. These get
449 # entry points in the global name space so they can be called
450 # as global functions.
451 #
452
454 if not SCons.Script.sconscript_reading:
455 raise SCons.Errors.UserError("Calling Configure from Builders is not supported.")
456 kw['_depth'] = kw.get('_depth', 0) + 1
457 return SCons.Environment.Base.Configure(self, *args, **kw)
458
461
463 """Exit abnormally if the SCons version is not late enough."""
464 scons_ver = self._get_major_minor_revision(SCons.__version__)
465 if scons_ver < (major, minor, revision):
466 if revision:
467 scons_ver_string = '%d.%d.%d' % (major, minor, revision)
468 else:
469 scons_ver_string = '%d.%d' % (major, minor)
470 print "SCons %s or greater required, but you have SCons %s" % \
471 (scons_ver_string, SCons.__version__)
472 sys.exit(2)
473
475 """Exit abnormally if the Python version is not late enough."""
476 try:
477 v_major, v_minor, v_micro, release, serial = sys.version_info
478 python_ver = (v_major, v_minor)
479 except AttributeError:
480 python_ver = self._get_major_minor_revision(sys.version)[:2]
481 if python_ver < (major, minor):
482 v = sys.version.split(" ", 1)[0]
483 print "Python %d.%d or greater required, but you have Python %s" %(major,minor,v)
484 sys.exit(2)
485
488
490 for var in vars:
491 global_exports.update(compute_exports(self.Split(var)))
492 global_exports.update(kw)
493
497
501
505
507 try:
508 frame = call_stack[-1]
509 globals = frame.globals
510 exports = frame.exports
511 for var in vars:
512 var = self.Split(var)
513 for v in var:
514 if v == '*':
515 globals.update(global_exports)
516 globals.update(exports)
517 else:
518 if v in exports:
519 globals[v] = exports[v]
520 else:
521 globals[v] = global_exports[v]
522 except KeyError,x:
523 raise SCons.Errors.UserError("Import of non-existent variable '%s'"%x)
524
526 if 'build_dir' in kw:
527 msg = """The build_dir keyword has been deprecated; use the variant_dir keyword instead."""
528 SCons.Warnings.warn(SCons.Warnings.DeprecatedBuildDirWarning, msg)
529 def subst_element(x, subst=self.subst):
530 if SCons.Util.is_List(x):
531 x = list(map(subst, x))
532 else:
533 x = subst(x)
534 return x
535 ls = list(map(subst_element, ls))
536 subst_kw = {}
537 for key, val in kw.items():
538 if SCons.Util.is_String(val):
539 val = self.subst(val)
540 elif SCons.Util.is_List(val):
541 result = []
542 for v in val:
543 if SCons.Util.is_String(v):
544 v = self.subst(v)
545 result.append(v)
546 val = result
547 subst_kw[key] = val
548
549 files, exports = self._get_SConscript_filenames(ls, subst_kw)
550 subst_kw['exports'] = exports
551 return _SConscript(self.fs, *files, **subst_kw)
552
556
560
561 #
562 #
563 #
564 SCons.Environment.Environment = SConsEnvironment
565
567 if not SCons.Script.sconscript_reading:
568 raise SCons.Errors.UserError("Calling Configure from Builders is not supported.")
569 kw['_depth'] = 1
570 return SCons.SConf.SConf(*args, **kw)
571
572 # It's very important that the DefaultEnvironmentCall() class stay in this
573 # file, with the get_calling_namespaces() function, the compute_exports()
574 # function, the Frame class and the SConsEnvironment.Export() method.
575 # These things make up the calling stack leading up to the actual global
576 # Export() or SConscript() call that the user issued. We want to allow
577 # users to export local variables that they define, like so:
578 #
579 # def func():
580 # x = 1
581 # Export('x')
582 #
583 # To support this, the get_calling_namespaces() function assumes that
584 # the *first* stack frame that's not from this file is the local frame
585 # for the Export() or SConscript() call.
586
587 _DefaultEnvironmentProxy = None
588
590 global _DefaultEnvironmentProxy
591 if not _DefaultEnvironmentProxy:
592 default_env = SCons.Defaults.DefaultEnvironment()
593 _DefaultEnvironmentProxy = SCons.Environment.NoSubstitutionProxy(default_env)
594 return _DefaultEnvironmentProxy
595
597 """A class that implements "global function" calls of
598 Environment methods by fetching the specified method from the
599 DefaultEnvironment's class. Note that this uses an intermediate
600 proxy class instead of calling the DefaultEnvironment method
601 directly so that the proxy can override the subst() method and
602 thereby prevent expansion of construction variables (since from
603 the user's point of view this was called as a global function,
604 with no associated construction environment)."""
606 self.method_name = method_name
607 if subst:
608 self.factory = SCons.Defaults.DefaultEnvironment
609 else:
610 self.factory = get_DefaultEnvironmentProxy
615
616
618 """
619 Create a dictionary containing all the default globals for
620 SConstruct and SConscript files.
621 """
622
623 global GlobalDict
624 if GlobalDict is None:
625 GlobalDict = {}
626
627 import SCons.Script
628 d = SCons.Script.__dict__
629 def not_a_module(m, d=d, mtype=type(SCons.Script)):
630 return not isinstance(d[m], mtype)
631 for m in filter(not_a_module, dir(SCons.Script)):
632 GlobalDict[m] = d[m]
633
634 return GlobalDict.copy()
635
636 # Local Variables:
637 # tab-width:4
638 # indent-tabs-mode:nil
639 # End:
640 # vim: set expandtab tabstop=4 shiftwidth=4:
641
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