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-rw-r--r--pugl/waflib/extras/stracedeps.py174
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diff --git a/pugl/waflib/extras/stracedeps.py b/pugl/waflib/extras/stracedeps.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2015 (ita)
+
+"""
+Execute tasks through strace to obtain dependencies after the process is run. This
+scheme is similar to that of the Fabricate script.
+
+To use::
+
+ def configure(conf):
+ conf.load('strace')
+
+WARNING:
+* This will not work when advanced scanners are needed (qt4/qt5)
+* The overhead of running 'strace' is significant (56s -> 1m29s)
+* It will not work on Windows :-)
+"""
+
+import os, re, threading
+from waflib import Task, Logs, Utils
+
+#TRACECALLS = 'trace=access,chdir,clone,creat,execve,exit_group,fork,lstat,lstat64,mkdir,open,rename,stat,stat64,symlink,vfork'
+TRACECALLS = 'trace=process,file'
+
+BANNED = ('/tmp', '/proc', '/sys', '/dev')
+
+s_process = r'(?:clone|fork|vfork)\(.*?(?P<npid>\d+)'
+s_file = r'(?P<call>\w+)\("(?P<path>([^"\\]|\\.)*)"(.*)'
+re_lines = re.compile(r'^(?P<pid>\d+)\s+(?:(?:%s)|(?:%s))\r*$' % (s_file, s_process), re.IGNORECASE | re.MULTILINE)
+strace_lock = threading.Lock()
+
+def configure(conf):
+ conf.find_program('strace')
+
+def task_method(func):
+ # Decorator function to bind/replace methods on the base Task class
+ #
+ # The methods Task.exec_command and Task.sig_implicit_deps already exists and are rarely overridden
+ # we thus expect that we are the only ones doing this
+ try:
+ setattr(Task.Task, 'nostrace_%s' % func.__name__, getattr(Task.Task, func.__name__))
+ except AttributeError:
+ pass
+ setattr(Task.Task, func.__name__, func)
+ return func
+
+@task_method
+def get_strace_file(self):
+ try:
+ return self.strace_file
+ except AttributeError:
+ pass
+
+ if self.outputs:
+ ret = self.outputs[0].abspath() + '.strace'
+ else:
+ ret = '%s%s%d%s' % (self.generator.bld.bldnode.abspath(), os.sep, id(self), '.strace')
+ self.strace_file = ret
+ return ret
+
+@task_method
+def get_strace_args(self):
+ return (self.env.STRACE or ['strace']) + ['-e', TRACECALLS, '-f', '-o', self.get_strace_file()]
+
+@task_method
+def exec_command(self, cmd, **kw):
+ bld = self.generator.bld
+ if not 'cwd' in kw:
+ kw['cwd'] = self.get_cwd()
+
+ args = self.get_strace_args()
+ fname = self.get_strace_file()
+ if isinstance(cmd, list):
+ cmd = args + cmd
+ else:
+ cmd = '%s %s' % (' '.join(args), cmd)
+
+ try:
+ ret = bld.exec_command(cmd, **kw)
+ finally:
+ if not ret:
+ self.parse_strace_deps(fname, kw['cwd'])
+ return ret
+
+@task_method
+def sig_implicit_deps(self):
+ # bypass the scanner functions
+ return
+
+@task_method
+def parse_strace_deps(self, path, cwd):
+ # uncomment the following line to disable the dependencies and force a file scan
+ # return
+ try:
+ cnt = Utils.readf(path)
+ finally:
+ try:
+ os.remove(path)
+ except OSError:
+ pass
+
+ if not isinstance(cwd, str):
+ cwd = cwd.abspath()
+
+ nodes = []
+ bld = self.generator.bld
+ try:
+ cache = bld.strace_cache
+ except AttributeError:
+ cache = bld.strace_cache = {}
+
+ # chdir and relative paths
+ pid_to_cwd = {}
+
+ global BANNED
+ done = set()
+ for m in re.finditer(re_lines, cnt):
+ # scraping the output of strace
+ pid = m.group('pid')
+ if m.group('npid'):
+ npid = m.group('npid')
+ pid_to_cwd[npid] = pid_to_cwd.get(pid, cwd)
+ continue
+
+ p = m.group('path').replace('\\"', '"')
+
+ if p == '.' or m.group().find('= -1 ENOENT') > -1:
+ # just to speed it up a bit
+ continue
+
+ if not os.path.isabs(p):
+ p = os.path.join(pid_to_cwd.get(pid, cwd), p)
+
+ call = m.group('call')
+ if call == 'chdir':
+ pid_to_cwd[pid] = p
+ continue
+
+ if p in done:
+ continue
+ done.add(p)
+
+ for x in BANNED:
+ if p.startswith(x):
+ break
+ else:
+ if p.endswith('/') or os.path.isdir(p):
+ continue
+
+ try:
+ node = cache[p]
+ except KeyError:
+ strace_lock.acquire()
+ try:
+ cache[p] = node = bld.root.find_node(p)
+ if not node:
+ continue
+ finally:
+ strace_lock.release()
+ nodes.append(node)
+
+ # record the dependencies then force the task signature recalculation for next time
+ if Logs.verbose:
+ Logs.debug('deps: real scanner for %r returned %r', self, nodes)
+ bld = self.generator.bld
+ bld.node_deps[self.uid()] = nodes
+ bld.raw_deps[self.uid()] = []
+ try:
+ del self.cache_sig
+ except AttributeError:
+ pass
+ self.signature()
+