396 lines
11 KiB
Python
396 lines
11 KiB
Python
#!/usr/bin/env python
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# ex:ts=4:sw=4:sts=4:et
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# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
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"""
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BitBake 'Build' implementation
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Core code for function execution and task handling in the
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BitBake build tools.
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Copyright (C) 2003, 2004 Chris Larson
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Based on Gentoo's portage.py.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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Based on functions from the base bb module, Copyright 2003 Holger Schurig
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"""
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from bb import debug, data, fetch, fatal, error, note, event, mkdirhier
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import bb, os
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# data holds flags and function name for a given task
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_task_data = data.init()
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# graph represents task interdependencies
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_task_graph = bb.digraph()
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# stack represents execution order, excepting dependencies
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_task_stack = []
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# events
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class FuncFailed(Exception):
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"""Executed function failed"""
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class EventException(Exception):
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"""Exception which is associated with an Event."""
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def __init__(self, msg, event):
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self.args = msg, event
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class TaskBase(event.Event):
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"""Base class for task events"""
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def __init__(self, t, d ):
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self._task = t
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event.Event.__init__(self, d)
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def getTask(self):
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return self._task
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def setTask(self, task):
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self._task = task
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task = property(getTask, setTask, None, "task property")
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class TaskStarted(TaskBase):
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"""Task execution started"""
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class TaskSucceeded(TaskBase):
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"""Task execution completed"""
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class TaskFailed(TaskBase):
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"""Task execution failed"""
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class InvalidTask(TaskBase):
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"""Invalid Task"""
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# functions
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def init(data):
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global _task_data, _task_graph, _task_stack
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_task_data = data.init()
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_task_graph = bb.digraph()
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_task_stack = []
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def exec_func(func, d, dirs = None):
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"""Execute an BB 'function'"""
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body = data.getVar(func, d)
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if not body:
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return
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if not dirs:
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dirs = (data.getVarFlag(func, 'dirs', d) or "").split()
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for adir in dirs:
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adir = data.expand(adir, d)
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mkdirhier(adir)
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if len(dirs) > 0:
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adir = dirs[-1]
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else:
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adir = data.getVar('B', d, 1)
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adir = data.expand(adir, d)
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try:
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prevdir = os.getcwd()
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except OSError:
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prevdir = data.expand('${TOPDIR}', d)
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if adir and os.access(adir, os.F_OK):
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os.chdir(adir)
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if data.getVarFlag(func, "python", d):
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exec_func_python(func, d)
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else:
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exec_func_shell(func, d)
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if os.path.exists(prevdir):
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os.chdir(prevdir)
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def exec_func_python(func, d):
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"""Execute a python BB 'function'"""
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import re, os
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tmp = "def " + func + "():\n%s" % data.getVar(func, d)
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comp = compile(tmp + '\n' + func + '()', bb.data.getVar('FILE', d, 1) + ':' + func, "exec")
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prevdir = os.getcwd()
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g = {} # globals
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g['bb'] = bb
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g['os'] = os
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g['d'] = d
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exec comp in g
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if os.path.exists(prevdir):
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os.chdir(prevdir)
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def exec_func_shell(func, d):
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"""Execute a shell BB 'function' Returns true if execution was successful.
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For this, it creates a bash shell script in the tmp dectory, writes the local
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data into it and finally executes. The output of the shell will end in a log file and stdout.
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Note on directory behavior. The 'dirs' varflag should contain a list
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of the directories you need created prior to execution. The last
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item in the list is where we will chdir/cd to.
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"""
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import sys
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deps = data.getVarFlag(func, 'deps', d)
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check = data.getVarFlag(func, 'check', d)
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if check in globals():
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if globals()[check](func, deps):
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return
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global logfile
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t = data.getVar('T', d, 1)
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if not t:
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return 0
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mkdirhier(t)
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logfile = "%s/log.%s.%s" % (t, func, str(os.getpid()))
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runfile = "%s/run.%s.%s" % (t, func, str(os.getpid()))
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f = open(runfile, "w")
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f.write("#!/bin/sh -e\n")
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if bb.debug_level > 0: f.write("set -x\n")
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data.emit_env(f, d)
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f.write("cd %s\n" % os.getcwd())
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if func: f.write("%s\n" % func)
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f.close()
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os.chmod(runfile, 0775)
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if not func:
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error("Function not specified")
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raise FuncFailed()
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# open logs
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si = file('/dev/null', 'r')
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try:
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if bb.debug_level > 0:
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so = os.popen("tee \"%s\"" % logfile, "w")
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else:
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so = file(logfile, 'w')
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except OSError, e:
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bb.error("opening log file: %s" % e)
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pass
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se = so
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# dup the existing fds so we dont lose them
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osi = [os.dup(sys.stdin.fileno()), sys.stdin.fileno()]
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oso = [os.dup(sys.stdout.fileno()), sys.stdout.fileno()]
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ose = [os.dup(sys.stderr.fileno()), sys.stderr.fileno()]
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# replace those fds with our own
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os.dup2(si.fileno(), osi[1])
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os.dup2(so.fileno(), oso[1])
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os.dup2(se.fileno(), ose[1])
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# execute function
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prevdir = os.getcwd()
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if data.getVarFlag(func, "fakeroot", d):
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maybe_fakeroot = "PATH=\"%s\" fakeroot " % bb.data.getVar("PATH", d, 1)
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else:
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maybe_fakeroot = ''
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ret = os.system('%ssh -e %s' % (maybe_fakeroot, runfile))
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os.chdir(prevdir)
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# restore the backups
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os.dup2(osi[0], osi[1])
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os.dup2(oso[0], oso[1])
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os.dup2(ose[0], ose[1])
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# close our logs
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si.close()
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so.close()
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se.close()
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# close the backup fds
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os.close(osi[0])
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os.close(oso[0])
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os.close(ose[0])
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if ret==0:
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if bb.debug_level > 0:
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os.remove(runfile)
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# os.remove(logfile)
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return
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else:
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error("function %s failed" % func)
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if data.getVar("BBINCLUDELOGS", d):
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error("log data follows (%s)" % logfile)
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f = open(logfile, "r")
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while True:
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l = f.readline()
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if l == '':
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break
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l = l.rstrip()
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print '| %s' % l
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f.close()
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else:
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error("see log in %s" % logfile)
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raise FuncFailed( logfile )
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def exec_task(task, d):
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"""Execute an BB 'task'
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The primary difference between executing a task versus executing
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a function is that a task exists in the task digraph, and therefore
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has dependencies amongst other tasks."""
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# check if the task is in the graph..
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task_graph = data.getVar('_task_graph', d)
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if not task_graph:
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task_graph = bb.digraph()
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data.setVar('_task_graph', task_graph, d)
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task_cache = data.getVar('_task_cache', d)
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if not task_cache:
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task_cache = []
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data.setVar('_task_cache', task_cache, d)
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if not task_graph.hasnode(task):
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raise EventException("Missing node in task graph", InvalidTask(task, d))
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# check whether this task needs executing..
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if not data.getVarFlag(task, 'force', d):
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if stamp_is_current(task, d):
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return 1
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# follow digraph path up, then execute our way back down
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def execute(graph, item):
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if data.getVarFlag(item, 'task', d):
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if item in task_cache:
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return 1
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if task != item:
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# deeper than toplevel, exec w/ deps
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exec_task(item, d)
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return 1
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try:
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debug(1, "Executing task %s" % item)
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old_overrides = data.getVar('OVERRIDES', d, 0)
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localdata = data.createCopy(d)
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data.setVar('OVERRIDES', 'task_%s:%s' % (item, old_overrides), localdata)
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data.update_data(localdata)
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event.fire(TaskStarted(item, localdata))
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exec_func(item, localdata)
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event.fire(TaskSucceeded(item, localdata))
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task_cache.append(item)
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data.setVar('_task_cache', task_cache, d)
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except FuncFailed, reason:
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note( "Task failed: %s" % reason )
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failedevent = TaskFailed(item, d)
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event.fire(failedevent)
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raise EventException("Function failed in task: %s" % reason, failedevent)
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# execute
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task_graph.walkdown(task, execute)
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# make stamp, or cause event and raise exception
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if not data.getVarFlag(task, 'nostamp', d):
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mkstamp(task, d)
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def stamp_is_current(task, d, checkdeps = 1):
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"""Check status of a given task's stamp. returns 0 if it is not current and needs updating."""
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task_graph = data.getVar('_task_graph', d)
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if not task_graph:
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task_graph = bb.digraph()
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data.setVar('_task_graph', task_graph, d)
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stamp = data.getVar('STAMP', d)
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if not stamp:
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return 0
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stampfile = "%s.%s" % (data.expand(stamp, d), task)
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if not os.access(stampfile, os.F_OK):
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return 0
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if checkdeps == 0:
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return 1
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import stat
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tasktime = os.stat(stampfile)[stat.ST_MTIME]
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_deps = []
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def checkStamp(graph, task):
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# check for existance
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if data.getVarFlag(task, 'nostamp', d):
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return 1
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if not stamp_is_current(task, d, 0):
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return 0
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depfile = "%s.%s" % (data.expand(stamp, d), task)
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deptime = os.stat(depfile)[stat.ST_MTIME]
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if deptime > tasktime:
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return 0
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return 1
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return task_graph.walkdown(task, checkStamp)
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def md5_is_current(task):
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"""Check if a md5 file for a given task is current"""
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def mkstamp(task, d):
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"""Creates/updates a stamp for a given task"""
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stamp = data.getVar('STAMP', d)
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if not stamp:
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return
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stamp = "%s.%s" % (data.expand(stamp, d), task)
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mkdirhier(os.path.dirname(stamp))
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open(stamp, "w+")
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def add_task(task, deps, d):
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task_graph = data.getVar('_task_graph', d)
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if not task_graph:
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task_graph = bb.digraph()
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data.setVarFlag(task, 'task', 1, d)
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task_graph.addnode(task, None)
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for dep in deps:
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if not task_graph.hasnode(dep):
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task_graph.addnode(dep, None)
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task_graph.addnode(task, dep)
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# don't assume holding a reference
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data.setVar('_task_graph', task_graph, d)
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def remove_task(task, kill, d):
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"""Remove an BB 'task'.
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If kill is 1, also remove tasks that depend on this task."""
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task_graph = data.getVar('_task_graph', d)
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if not task_graph:
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task_graph = bb.digraph()
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if not task_graph.hasnode(task):
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return
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data.delVarFlag(task, 'task', d)
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ref = 1
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if kill == 1:
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ref = 2
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task_graph.delnode(task, ref)
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data.setVar('_task_graph', task_graph, d)
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def task_exists(task, d):
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task_graph = data.getVar('_task_graph', d)
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if not task_graph:
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task_graph = bb.digraph()
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data.setVar('_task_graph', task_graph, d)
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return task_graph.hasnode(task)
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def get_task_data():
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return _task_data
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