why.py (1891B)
1 #! /usr/bin/env python 2 # encoding: utf-8 3 # Thomas Nagy, 2010 (ita) 4 5 """ 6 This tool modifies the task signature scheme to store and obtain 7 information about the task execution (why it must run, etc):: 8 9 def configure(conf): 10 conf.load('why') 11 12 After adding the tool, a full rebuild is necessary: 13 waf clean build --zones=task 14 """ 15 16 from waflib import Task, Utils, Logs, Errors 17 18 def signature(self): 19 # compute the result one time, and suppose the scan_signature will give the good result 20 try: 21 return self.cache_sig 22 except AttributeError: 23 pass 24 25 self.m = Utils.md5() 26 self.m.update(self.hcode) 27 id_sig = self.m.digest() 28 29 # explicit deps 30 self.m = Utils.md5() 31 self.sig_explicit_deps() 32 exp_sig = self.m.digest() 33 34 # env vars 35 self.m = Utils.md5() 36 self.sig_vars() 37 var_sig = self.m.digest() 38 39 # implicit deps / scanner results 40 self.m = Utils.md5() 41 if self.scan: 42 try: 43 self.sig_implicit_deps() 44 except Errors.TaskRescan: 45 return self.signature() 46 impl_sig = self.m.digest() 47 48 ret = self.cache_sig = impl_sig + id_sig + exp_sig + var_sig 49 return ret 50 51 52 Task.Task.signature = signature 53 54 old = Task.Task.runnable_status 55 def runnable_status(self): 56 ret = old(self) 57 if ret == Task.RUN_ME: 58 try: 59 old_sigs = self.generator.bld.task_sigs[self.uid()] 60 except (KeyError, AttributeError): 61 Logs.debug("task: task must run as no previous signature exists") 62 else: 63 new_sigs = self.cache_sig 64 def v(x): 65 return Utils.to_hex(x) 66 67 Logs.debug('Task %r', self) 68 msgs = ['* Implicit or scanner dependency', '* Task code', '* Source file, explicit or manual dependency', '* Configuration data variable'] 69 tmp = 'task: -> %s: %s %s' 70 for x in range(len(msgs)): 71 l = len(Utils.SIG_NIL) 72 a = new_sigs[x*l : (x+1)*l] 73 b = old_sigs[x*l : (x+1)*l] 74 if (a != b): 75 Logs.debug(tmp, msgs[x].ljust(35), v(a), v(b)) 76 return ret 77 Task.Task.runnable_status = runnable_status 78