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74 lines
1.7 KiB
Python
74 lines
1.7 KiB
Python
#! /usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2010 (ita)
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"""
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This tool modifies the task signature scheme to store and obtain
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information about the task execution (why it must run, etc)::
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def configure(conf):
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conf.load('why')
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After adding the tool, a full rebuild is necessary.
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"""
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from waflib import Task, Utils, Logs, Errors
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def signature(self):
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# compute the result one time, and suppose the scan_signature will give the good result
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try: return self.cache_sig
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except AttributeError: pass
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self.m = Utils.md5()
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self.m.update(self.hcode.encode())
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id_sig = self.m.digest()
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# explicit deps
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self.sig_explicit_deps()
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exp_sig = self.m.digest()
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# env vars
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self.sig_vars()
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var_sig = self.m.digest()
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# implicit deps / scanner results
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if self.scan:
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try:
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self.sig_implicit_deps()
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except Errors.TaskRescan:
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return self.signature()
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ret = self.cache_sig = self.m.digest() + id_sig + exp_sig + var_sig
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return ret
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Task.Task.signature = signature
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old = Task.Task.runnable_status
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def runnable_status(self):
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ret = old(self)
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if ret == Task.RUN_ME:
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try:
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old_sigs = self.generator.bld.task_sigs[self.uid()]
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except (KeyError, AttributeError):
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Logs.debug("task: task must run as no previous signature exists")
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else:
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new_sigs = self.cache_sig
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def v(x):
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return Utils.to_hex(x)
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Logs.debug("Task %r" % self)
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msgs = ['Task must run', '* Task code', '* Source file or manual dependency', '* Configuration data variable']
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tmp = 'task: -> %s: %s %s'
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for x in range(len(msgs)):
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l = len(Utils.SIG_NIL)
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a = new_sigs[x*l : (x+1)*l]
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b = old_sigs[x*l : (x+1)*l]
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if (a != b):
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Logs.debug(tmp % (msgs[x].ljust(35), v(a), v(b)))
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if x > 0:
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break
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return ret
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Task.Task.runnable_status = runnable_status
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