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#! /usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2015
"""
Force tasks to use file timestamps to force partial rebuilds when touch-ing build files
touch out/libfoo.a
... rebuild what depends on libfoo.a
to use::
def options(opt):
opt.tool_options('build_file_tracker')
"""
import os
import Task, Utils
def signature(self):
try: return self.cache_sig[0]
except AttributeError: pass
self.m = Utils.md5()
# explicit deps
exp_sig = self.sig_explicit_deps()
# env vars
var_sig = self.sig_vars()
# implicit deps
imp_sig = Task.SIG_NIL
if self.scan:
try:
imp_sig = self.sig_implicit_deps()
except ValueError:
return self.signature()
# timestamp dependency on build files only (source files are hashed)
buf = []
for k in self.inputs + getattr(self, 'dep_nodes', []) + self.generator.bld.node_deps.get(self.unique_id(), []):
if k.id & 3 == 3:
t = os.stat(k.abspath(self.env)).st_mtime
buf.append(t)
self.m.update(str(buf))
# we now have the signature (first element) and the details (for debugging)
ret = self.m.digest()
self.cache_sig = (ret, exp_sig, imp_sig, var_sig)
return ret
Task.Task.signature_bak = Task.Task.signature # unused, kept just in case
Task.Task.signature = signature # overridden
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