buildtools/wafsamba/samba_cross.py

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