196 lines
6.8 KiB
Python
Executable File
196 lines
6.8 KiB
Python
Executable File
#!/usr/bin/python -u
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"""
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Allocates resources from Murphy and/or a make jobserver while running
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some command.
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"""
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import time
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import os
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import re
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import subprocess
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import signal
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from optparse import OptionParser
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usage = "usage: %prog [options] [--] command arg1 arg2 ..."
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parser = OptionParser(usage=usage)
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parser.add_option("-r", "--murphy-resource",
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dest="resources",
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action="append",
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help="Name of a Muprhy resource which gets locked while running the command.")
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parser.add_option("-j", "--jobs",
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default=1,
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type='int',
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action="store",
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help="Number of jobs to allocate from job server. Ignored if not running under a job server.")
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(options, args) = parser.parse_args()
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def log(format, *args):
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now = time.time()
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print time.asctime(time.gmtime(now)), 'UTC', '(+ %.1fs / %.1fs)' % (now - log.latest, now - log.start), format % args
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log.latest = now
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log.start = time.time()
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log.latest = log.start
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# Murphy support: as a first step, lock one resource named like the
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# test before running the test.
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gobject = None
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if options.resources:
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try:
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import gobject
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except ImportError:
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from gi.repository import GObject as gobject
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import dbus
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from dbus.mainloop.glib import DBusGMainLoop
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DBusGMainLoop(set_as_default=True)
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if not os.environ.get('DBUS_SESSION_BUS_ADDRESS', None):
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# Try to set up Murphy with a murphy-launch.py helper script
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# which is expected to be provided by the test environment
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# (not included in SyncEvolution).
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vars = subprocess.check_output(['murphy-launch.py'])
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for line in vars.split('\n'):
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if line:
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var, value = line.split('=', 1)
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os.environ[var] = value
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bus = dbus.SessionBus()
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loop = gobject.MainLoop()
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murphy = dbus.Interface(bus.get_object('org.Murphy', '/org/murphy/resource'), 'org.murphy.manager')
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# Support mapping of resource "foo" to "bar" with RESOURCES_FOO=bar.
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resources = []
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for name in options.resources:
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replacement = os.environ.get('RESOURCES_%s' % name.upper(), None)
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if replacement is not None:
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resources.extend(replacement.split(','))
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else:
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resources.append(name)
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if resources != options.resources:
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log('replaced resource set %s with %s based on RESOURCES_* env vars', options.resources, resources)
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if resources:
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log('=== locking resource(s) %s ===', resources)
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resourcesetpath = murphy.createResourceSet()
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resourceset = dbus.Interface(bus.get_object('org.Murphy', resourcesetpath), 'org.murphy.resourceset')
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for name in resources:
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resourcepath = resourceset.addResource(name)
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# Allow sharing of the resource. Only works if the resource
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# was marked as "shareable" in the murphy config, otherwise
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# we get exclusive access.
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resource = dbus.Interface(bus.get_object('org.Murphy', resourcepath), 'org.murphy.resource')
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resource.setProperty('shared', dbus.Boolean(True, variant_level=1))
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# Track pending request separately, because status == 'pending'
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# either means something else ('unknown'?) or is buggy/unreliable.
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# See https://github.com/01org/murphy/issues/5
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pending = False
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def propertyChanged(prop, value):
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global pending
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log('property changed: %s = %s', prop, value)
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if prop == 'status':
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if value == 'acquired':
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# Success!
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loop.quit()
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elif value == 'lost':
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# Not yet?!
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log('Murphy request failed, waiting for resource to become available.')
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pending = False
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elif value == 'pending':
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pass
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elif value == 'available':
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if not pending:
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log('Murphy request may succeed now, try again.')
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resourceset.request()
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pending = True
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else:
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log('Unexpected status: %s', value)
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try:
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match = bus.add_signal_receiver(propertyChanged, 'propertyChanged', 'org.murphy.resourceset', 'org.Murphy', resourcesetpath)
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resourceset.request()
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pending = True
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loop.run()
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finally:
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match.remove()
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class Jobserver:
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'''Allocates the given number of job slots from the "make -j"
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jobserver, then runs the command and finally returns the slots.
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See http://mad-scientist.net/make/jobserver.html'''
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def __init__(self):
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self.havejobserver = False
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self.allocated = 0
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# MAKEFLAGS= --jobserver-fds=3,4 -j
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flags = os.environ.get('MAKEFLAGS', '')
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m = re.search(r'--jobserver-fds=(\d+),(\d+)', flags)
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if m:
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self.receiveslots = int(m.group(1))
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self.returnslots = int(m.group(2))
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self.blocked = {}
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self.havejobserver = True
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log('using jobserver')
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else:
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log('not using jobserver')
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def active(self):
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return self.havejobserver
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def alloc(self, numjobs = 1):
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if not self.havejobserver:
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return
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n = 0
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self._block()
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try:
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while n < numjobs:
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os.read(self.receiveslots, 1)
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n += 1
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self.allocated += n
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n = 0
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except:
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os.write(self.returnslots, ' ' * n)
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raise
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finally:
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self._unblock()
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def free(self, numjobs = 1):
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if not self.havejobserver:
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return
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try:
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self.allocated -= numjobs
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os.write(self.returnslots, ' ' * numjobs)
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finally:
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self._unblock()
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def _block(self):
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'''Block signals if not already done.'''
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if not self.blocked:
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for sig in [ signal.SIGINT, signal.SIGTERM ]:
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self.blocked[sig] = signal.signal(sig, signal.SIG_IGN)
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def _unblock(self):
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'''Unblock signals if blocked and we currently own no slots.'''
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if self.blocked and not self.allocated:
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for sig, handler in self.blocked.items():
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signal.signal(sig, handler)
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self.blocked = {}
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jobserver = Jobserver()
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jobs = 0
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if jobserver.active() and options.jobs:
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log('=== allocating %d job slot(s) ===', options.jobs)
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jobserver.alloc(options.jobs)
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log('=== allocated %d job slot(s) ===', options.jobs)
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jobs = options.jobs
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try:
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subprocess.check_call(args)
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finally:
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log('=== cleaning up ===')
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# Return job tokens.
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if jobs:
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jobserver.free(jobs)
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# We don't need to unlock the Murphy resource. Quitting will do
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# that automatically.
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