def _build(t): if (os.path.exists(t) and not state.is_generated(t) and not os.path.exists('%s.do' % t)): # an existing source file that is not marked as a generated file. # This step is mentioned by djb in his notes. It turns out to be # important to prevent infinite recursion. For example, a rule # called default.c.do could be used to try to produce hello.c, # which is undesirable since hello.c existed already. state.stamp(t) return # success state.start(t) (dofile, basename, ext) = _find_do_file(t) if not dofile: raise BuildError('no rule to make %r' % t) state.stamp(dofile) tmpname = '%s.redo.tmp' % t unlink(tmpname) f = open(tmpname, 'w+') # this will run in the dofile's directory, so use only basenames here argv = ['sh', '-e', os.path.basename(dofile), os.path.basename(basename), # target name (extension removed) ext, # extension (if any), including leading dot os.path.basename(tmpname) # randomized output file name ] if vars.VERBOSE: argv[1] += 'v' log_('\n') log('%s\n' % relpath(t, vars.STARTDIR)) rv = subprocess.call(argv, preexec_fn=lambda: _preexec(t), stdout=f.fileno()) if rv==0: if os.path.exists(tmpname) and os.stat(tmpname).st_size: # there's a race condition here, but if the tmpfile disappears # at *this* point you deserve to get an error, because you're # doing something totally scary. os.rename(tmpname, t) else: unlink(tmpname) state.stamp(t) else: unlink(tmpname) state.unstamp(t) f.close() if rv != 0: raise BuildError('%s: exit code %d' % (t,rv)) if vars.VERBOSE: log('%s (done)\n\n' % relpath(t, vars.STARTDIR))
def dirty_deps(t, depth, fromdir=None): if _dirty_deps(t, depth, fromdir): state.unstamp(t, fromdir) return True return False