qdo revision 1884 
1#! /usr/bin/env python
2
3# Copyright (c) 2004-2005 The Regents of The University of Michigan
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are
8# met: redistributions of source code must retain the above copyright
9# notice, this list of conditions and the following disclaimer;
10# redistributions in binary form must reproduce the above copyright
11# notice, this list of conditions and the following disclaimer in the
12# documentation and/or other materials provided with the distribution;
13# neither the name of the copyright holders nor the names of its
14# contributors may be used to endorse or promote products derived from
15# this software without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29import sys
30import os
31import re
32import time
33import optparse
34
35import pexpect
36
37progname = os.path.basename(sys.argv[0])
38
39usage = "%prog [options] command [command arguments]"
40optparser = optparse.OptionParser(usage=usage)
41optparser.allow_interspersed_args=False
42optparser.add_option('-e', dest='stderr_file',
43                     help='command stderr output file')
44optparser.add_option('-o', dest='stdout_file',
45                     help='command stdout output file')
46optparser.add_option('-l', dest='save_log', action='store_true',
47                     help='save qsub output log file')
48optparser.add_option('-q', dest='qsub_timeout', type='int',
49                     help='qsub queue wait timeout', default=30*60)
50optparser.add_option('-t', dest='cmd_timeout', type='int',
51                     help='command execution timeout', default=600*60)
52
53(options, cmd) = optparser.parse_args()
54
55if cmd == []:
56    print >>sys.stderr, "%s: missing command" % progname
57    sys.exit(1)
58
59cwd = os.getcwd()
60
61# Deal with systems where /n is a symlink to /.automount
62if cwd.startswith('/.automount/'):
63    cwd = cwd.replace('/.automount/', '/n/', 1)
64
65if not cwd.startswith('/n/poolfs/'):
66    print >>sys.stderr, "Error: current directory must be under /n/poolfs."
67    sys.exit(1)
68
69# The Shell class wraps pexpect.spawn with some handy functions that
70# assume the thing on the other end is a Bourne/bash shell.
71class Shell(pexpect.spawn):
72    # Regexp to match the shell prompt.  We change the prompt to
73    # something fixed and distinctive to make it easier to match
74    # reliably.
75    prompt_re = re.compile('qdo\$ ')
76
77    def __init__(self, cmd):
78        # initialize base pexpect.spawn object
79	try:
80            pexpect.spawn.__init__(self, cmd)
81	except pexpect.ExceptionPexpect, exc:
82	    print "%s:" % progname, exc
83	    sys.exit(1)
84        # full_output accumulates the full output of the session
85        self.full_output = ""
86        self.quick_timeout = 15
87        # wait for a prompt, then change it
88        try:
89            self.expect('\$ ', options.qsub_timeout)
90        except pexpect.TIMEOUT:
91            print >>sys.stderr, "%s: qsub timed out." % progname
92            self.kill(15)
93            self.close(wait=True)
94            sys.exit(1)
95        self.do_command('PS1="qdo$ "')
96
97    # version of expect that updates full_output too
98    def expect(self, regexp, timeout = -1):
99        pexpect.spawn.expect(self, regexp, timeout)
100        self.full_output += self.before + self.after
101
102    # Just issue a command and wait for the next prompt.
103    # Returns a string containing the output of the command.
104    def do_bare_command(self, cmd, timeout = -1):
105        global full_output
106        self.sendline(cmd)
107        # read back the echo of the command
108        self.readline()
109        # wait for the next prompt
110        self.expect(self.prompt_re, timeout)
111        output = self.before.rstrip()
112        return output
113
114    # Issue a command, then query its exit status.
115    # Returns a (string, int) tuple with the command output and the status.
116    def do_command(self, cmd, timeout = -1):
117        # do the command itself
118        output = self.do_bare_command(cmd, timeout)
119        # collect status
120        status = int(self.do_bare_command("echo $?", self.quick_timeout))
121        return (output, status)
122
123    # Check to see if the given directory exists.
124    def dir_exists(self, dirname):
125        (output, status) = shell.do_command('[ -d %s ]' % dirname,
126                                            self.quick_timeout)
127        return status == 0
128
129
130# Spawn the interactive pool job.
131
132# Hack to do link on poolfs... disabled for now since
133# compiler/linker/library versioning problems between poolfs and
134# nodes.  May never work since poolfs is x86-64 and nodes are 32-bit.
135if False and len(cmd) > 50:
136    shell_cmd = 'ssh -t poolfs /bin/sh -l'
137    print "%s: running %s on poolfs" % (progname, cmd[0])
138else:
139    shell_cmd = 'qsub -I -S /bin/sh'
140
141shell = Shell(shell_cmd)
142
143try:
144    # chdir to cwd
145    (output, status) = shell.do_command('cd ' + cwd)
146
147    if status != 0:
148        raise OSError, "Can't chdir to %s" % cwd
149
150    # wacky hack: sometimes scons will create an output directory then
151    # fork a job to generate files in that directory, and the job will
152    # get run before the directory creation propagates through NFS.
153    # This hack looks for a '-o' option indicating an output file and
154    # waits for the corresponding directory to appear if necessary.
155    try:
156        if 'cc' in cmd[0] or 'g++' in cmd[0]:
157            output_dir = os.path.dirname(cmd[cmd.index('-o')+1])
158        elif 'm5' in cmd[0]:
159            output_dir = cmd[cmd.index('-d')+1]
160        else:
161            output_dir = None
162    except (ValueError, IndexError):
163        # no big deal if there's no '-o'/'-d' or if it's the final argument
164        output_dir = None
165
166    if output_dir:
167        secs_waited = 0
168        while not shell.dir_exists(output_dir) and secs_waited < 45:
169            time.sleep(5)
170            secs_waited += 5
171        if secs_waited > 10:
172            print "waited", secs_waited, "seconds for", output_dir
173
174    # run command
175    if options.stdout_file:
176        cmd += ['>', options.stdout_file]
177    if options.stderr_file:
178        cmd += ['2>', options.stderr_file]
179    try:
180        (output, status) = shell.do_command(' '.join(cmd), options.cmd_timeout)
181    except pexpect.TIMEOUT:
182            print >>sys.stderr, "%s: command timed out after %d seconds." \
183                  % (progname, options.cmd_timeout)
184            shell.sendline('~.') # qsub/ssh termination escape sequence
185            shell.close(wait=True)
186            status = 3
187    if output:
188        print output
189
190finally:
191    # end job
192    if shell.isalive():
193        shell.sendline('exit')
194        shell.expect('qsub: job .* completed\r\n')
195        shell.close(wait=True)
196
197    # if there was an error, log the output even if not requested
198    if status != 0 or options.save_log:
199        log = file('qdo-log.' + str(os.getpid()), 'w')
200        log.write(shell.full_output)
201        log.close()
202
203del shell
204
205sys.exit(status)
206