mdw@git.distorted.org.uk Git - stgit/blob - stgit/run.py

   1 # -*- coding: utf-8 -*-
   2
   3 __copyright__ = """
   4 Copyright (C) 2007, Karl Hasselström <kha@treskal.com>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License version 2 as
   8 published by the Free Software Foundation.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 """
  19
  20 import datetime, os, subprocess
  21
  22 from stgit.exception import *
  23 from stgit.out import *
  24
  25 class RunException(StgException):
  26     """Thrown when something bad happened when we tried to run the
  27     subprocess."""
  28     pass
  29
  30 _all_log_modes = ['debug', 'profile']
  31 _log_mode = os.environ.get('STGIT_SUBPROCESS_LOG', '')
  32 if _log_mode and not _log_mode in _all_log_modes:
  33     out.warn(('Unknown log mode "%s" specified in $STGIT_SUBPROCESS_LOG.'
  34               % _log_mode),
  35              'Valid values are: %s' % ', '.join(_all_log_modes))
  36
  37 class Run:
  38     exc = RunException
  39     def __init__(self, *cmd):
  40         self.__cmd = list(cmd)
  41         for c in cmd:
  42             if type(c) != str:
  43                 raise Exception, 'Bad command: %r' % (cmd,)
  44         self.__good_retvals = [0]
  45         self.__env = self.__cwd = None
  46         self.__indata = None
  47         self.__discard_stderr = False
  48     def __log_start(self):
  49         if _log_mode == 'debug':
  50             out.start('Running subprocess %s' % self.__cmd)
  51             if self.__cwd != None:
  52                 out.info('cwd: %s' % self.__cwd)
  53             if self.__env != None:
  54                 for k in sorted(self.__env.iterkeys()):
  55                     if k not in os.environ or os.environ[k] != self.__env[k]:
  56                         out.info('%s: %s' % (k, self.__env[k]))
  57         elif _log_mode == 'profile':
  58             out.start('Running subprocess %s' % self.__cmd[0])
  59             self.__starttime = datetime.datetime.now()
  60     def __log_end(self, retcode):
  61         if _log_mode == 'debug':
  62             out.done('return code: %d' % retcode)
  63         elif _log_mode == 'profile':
  64             duration = datetime.datetime.now() - self.__starttime
  65             out.done('%1.3f s' % (duration.microseconds/1e6 + duration.seconds))
  66     def __check_exitcode(self):
  67         if self.__good_retvals == None:
  68             return
  69         if self.exitcode not in self.__good_retvals:
  70             raise self.exc('%s failed with code %d'
  71                            % (self.__cmd[0], self.exitcode))
  72     def __run_io(self):
  73         """Run with captured IO."""
  74         self.__log_start()
  75         try:
  76             p = subprocess.Popen(self.__cmd, env = self.__env, cwd = self.__cwd,
  77                                  stdin = subprocess.PIPE,
  78                                  stdout = subprocess.PIPE,
  79                                  stderr = subprocess.PIPE)
  80             outdata, errdata = p.communicate(self.__indata)
  81             self.exitcode = p.returncode
  82         except OSError, e:
  83             raise self.exc('%s failed: %s' % (self.__cmd[0], e))
  84         if errdata and not self.__discard_stderr:
  85             out.err_raw(errdata)
  86         self.__log_end(self.exitcode)
  87         self.__check_exitcode()
  88         return outdata
  89     def __run_noio(self):
  90         """Run without captured IO."""
  91         assert self.__indata == None
  92         self.__log_start()
  93         try:
  94             p = subprocess.Popen(self.__cmd, env = self.__env, cwd = self.__cwd)
  95             self.exitcode = p.wait()
  96         except OSError, e:
  97             raise self.exc('%s failed: %s' % (self.__cmd[0], e))
  98         self.__log_end(self.exitcode)
  99         self.__check_exitcode()
 100     def returns(self, retvals):
 101         self.__good_retvals = retvals
 102         return self
 103     def discard_exitcode(self):
 104         self.__good_retvals = None
 105         return self
 106     def discard_stderr(self, discard = True):
 107         self.__discard_stderr = discard
 108         return self
 109     def env(self, env):
 110         self.__env = dict(os.environ)
 111         self.__env.update(env)
 112         return self
 113     def cwd(self, cwd):
 114         self.__cwd = cwd
 115         return self
 116     def raw_input(self, indata):
 117         self.__indata = indata
 118         return self
 119     def input_lines(self, lines):
 120         self.__indata = ''.join(['%s\n' % line for line in lines])
 121         return self
 122     def input_nulterm(self, lines):
 123         self.__indata = ''.join('%s\0' % line for line in lines)
 124         return self
 125     def no_output(self):
 126         outdata = self.__run_io()
 127         if outdata:
 128             raise self.exc, '%s produced output' % self.__cmd[0]
 129     def discard_output(self):
 130         self.__run_io()
 131     def raw_output(self):
 132         return self.__run_io()
 133     def output_lines(self):
 134         outdata = self.__run_io()
 135         if outdata.endswith('\n'):
 136             outdata = outdata[:-1]
 137         if outdata:
 138             return outdata.split('\n')
 139         else:
 140             return []
 141     def output_one_line(self):
 142         outlines = self.output_lines()
 143         if len(outlines) == 1:
 144             return outlines[0]
 145         else:
 146             raise self.exc('%s produced %d lines, expected 1'
 147                            % (self.__cmd[0], len(outlines)))
 148     def run(self):
 149         """Just run, with no IO redirection."""
 150         self.__run_noio()
 151     def xargs(self, xargs):
 152         """Just run, with no IO redirection. The extra arguments are
 153         appended to the command line a few at a time; the command is
 154         run as many times as needed to consume them all."""
 155         step = 100
 156         basecmd = self.__cmd
 157         for i in xrange(0, len(xargs), step):
 158             self.__cmd = basecmd + xargs[i:i+step]
 159             self.__run_noio()
 160         self.__cmd = basecmd