buildtools/wafsamba/samba_cross.py

   1 # functions for handling cross-compilation
   2
   3 import Utils, Logs, sys, os, Options, re
   4 from Configure import conf
   5 import shlex
   6
   7 real_Popen = None
   8
   9 ANSWER_UNKNOWN = (254, "")
  10 ANSWER_NO      = (1, "")
  11 ANSWER_OK      = (0, "")
  12
  13 cross_answers_incomplete = False
  14
  15
  16 def add_answer(ca_file, msg, answer):
  17     '''add an answer to a set of cross answers'''
  18     try:
  19         f = open(ca_file, 'a')
  20     except:
  21         Logs.error("Unable to open cross-answers file %s" % ca_file)
  22         sys.exit(1)
  23     (retcode, retstring) = answer
  24     # if retstring is more than one line then we probably
  25     # don't care about its actual content (the tests should
  26     # yield one-line output in order to comply with the cross-answer
  27     # format)
  28     retstring = retstring.strip()
  29     if len(retstring.split('\n')) > 1:
  30         retstring = ''
  31     answer = (retcode, retstring)
  32
  33     if answer == ANSWER_OK:
  34         f.write('%s: OK\n' % msg)
  35     elif answer == ANSWER_UNKNOWN:
  36         f.write('%s: UNKNOWN\n' % msg)
  37     elif answer == ANSWER_NO:
  38         f.write('%s: NO\n' % msg)
  39     else:
  40         if retcode == 0:
  41             f.write('%s: "%s"\n' % (msg, retstring))
  42         else:
  43             f.write('%s: (%d, "%s")\n' % (msg, retcode, retstring))
  44     f.close()
  45
  46
  47 def cross_answer(ca_file, msg):
  48     '''return a (retcode,retstring) tuple from a answers file'''
  49     try:
  50         f = open(ca_file, 'r')
  51     except:
  52         return ANSWER_UNKNOWN
  53     for line in f:
  54         line = line.strip()
  55         if line == '' or line[0] == '#':
  56             continue
  57         if line.find(':') != -1:
  58             a = line.split(':', 1)
  59             thismsg = a[0].strip()
  60             if thismsg != msg:
  61                 continue
  62             ans = a[1].strip()
  63             if ans == "OK" or ans == "YES":
  64                 f.close()
  65                 return ANSWER_OK
  66             elif ans == "UNKNOWN":
  67                 f.close()
  68                 return ANSWER_UNKNOWN
  69             elif ans == "FAIL" or ans == "NO":
  70                 f.close()
  71                 return ANSWER_NO
  72             elif ans[0] == '"':
  73                 f.close()
  74                 return (0, ans.strip('"'))
  75             elif ans[0] == "'":
  76                 f.close()
  77                 return (0, ans.strip("'"))
  78             else:
  79                 m = re.match('\(\s*(-?\d+)\s*,\s*\"(.*)\"\s*\)', ans)
  80                 if m:
  81                     f.close()
  82                     return (int(m.group(1)), m.group(2))
  83                 else:
  84                     raise Utils.WafError("Bad answer format '%s' in %s" % (line, ca_file))
  85     f.close()
  86     return ANSWER_UNKNOWN
  87
  88
  89 class cross_Popen(Utils.pproc.Popen):
  90     '''cross-compilation wrapper for Popen'''
  91     def __init__(*k, **kw):
  92         (obj, args) = k
  93         use_answers = False
  94         ans = ANSWER_UNKNOWN
  95
  96         # Three possibilities:
  97         #   1. Only cross-answers - try the cross-answers file, and if
  98         #      there's no corresponding answer, add to the file and mark
  99         #      the configure process as unfinished.
 100         #   2. Only cross-execute - get the answer from cross-execute
 101         #   3. Both - try the cross-answers file, and if there is no
 102         #      corresponding answer - use cross-execute to get an answer,
 103         #       and add that answer to the file.
 104         if '--cross-answers' in args:
 105             # when --cross-answers is set, then change the arguments
 106             # to use the cross answers if available
 107             use_answers = True
 108             i = args.index('--cross-answers')
 109             ca_file = args[i+1]
 110             msg     = args[i+2]
 111             ans = cross_answer(ca_file, msg)
 112
 113         if '--cross-execute' in args and ans == ANSWER_UNKNOWN:
 114             # when --cross-execute is set, then change the arguments
 115             # to use the cross emulator
 116             i = args.index('--cross-execute')
 117             newargs = shlex.split(args[i+1])
 118             newargs.extend(args[0:i])
 119             if use_answers:
 120                 p = real_Popen(newargs,
 121                                stdout=Utils.pproc.PIPE,
 122                                stderr=Utils.pproc.PIPE)
 123                 ce_out, ce_err = p.communicate()
 124                 ans = (p.returncode, ce_out)
 125                 add_answer(ca_file, msg, ans)
 126             else:
 127                 args = newargs
 128
 129         if use_answers:
 130             if ans == ANSWER_UNKNOWN:
 131                 global cross_answers_incomplete
 132                 cross_answers_incomplete = True
 133                 add_answer(ca_file, msg, ans)
 134             (retcode, retstring) = ans
 135             args = ['/bin/sh', '-c', "echo -n '%s'; exit %d" % (retstring, retcode)]
 136         real_Popen.__init__(*(obj, args), **kw)
 137
 138
 139 @conf
 140 def SAMBA_CROSS_ARGS(conf, msg=None):
 141     '''get exec_args to pass when running cross compiled binaries'''
 142     if not conf.env.CROSS_COMPILE:
 143         return []
 144
 145     global real_Popen
 146     if real_Popen is None:
 147         real_Popen  = Utils.pproc.Popen
 148         Utils.pproc.Popen = cross_Popen
 149
 150     ret = []
 151
 152     if conf.env.CROSS_EXECUTE:
 153         ret.extend(['--cross-execute', conf.env.CROSS_EXECUTE])
 154
 155     if conf.env.CROSS_ANSWERS:
 156         if msg is None:
 157             raise Utils.WafError("Cannot have NULL msg in cross-answers")
 158         ret.extend(['--cross-answers', os.path.join(Options.launch_dir, conf.env.CROSS_ANSWERS), msg])
 159
 160     if ret == []:
 161         raise Utils.WafError("Cannot cross-compile without either --cross-execute or --cross-answers")
 162
 163     return ret
 164
 165 @conf
 166 def SAMBA_CROSS_CHECK_COMPLETE(conf):
 167     '''check if we have some unanswered questions'''
 168     global cross_answers_incomplete
 169     if conf.env.CROSS_COMPILE and cross_answers_incomplete:
 170         raise Utils.WafError("Cross answers file %s is incomplete" % conf.env.CROSS_ANSWERS)
 171     return True