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
   6 real_Popen = None
   7
   8 ANSWER_UNKNOWN = (254, "")
   9 ANSWER_FAIL    = (255, "")
  10 ANSWER_OK      = (0, "")
  11
  12 cross_answers_incomplete = False
  13
  14
  15 def add_answer(ca_file, msg, answer):
  16     '''add an answer to a set of cross answers'''
  17     try:
  18         f = open(ca_file, 'a')
  19     except:
  20         Logs.error("Unable to open cross-answers file %s" % ca_file)
  21         sys.exit(1)
  22     if answer == ANSWER_OK:
  23         f.write('%s: OK\n' % msg)
  24     elif answer == ANSWER_UNKNOWN:
  25         f.write('%s: UNKNOWN\n' % msg)
  26     elif answer == ANSWER_FAIL:
  27         f.write('%s: FAIL\n' % msg)
  28     else:
  29         (retcode, retstring) = answer
  30         f.write('%s: (%d, "%s")' % (msg, retcode, retstring))
  31     f.close()
  32
  33
  34 def cross_answer(ca_file, msg):
  35     '''return a (retcode,retstring) tuple from a answers file'''
  36     try:
  37         f = open(ca_file, 'r')
  38     except:
  39         add_answer(ca_file, msg, ANSWER_UNKNOWN)
  40         return ANSWER_UNKNOWN
  41     for line in f:
  42         line = line.strip()
  43         if line == '' or line[0] == '#':
  44             continue
  45         if line.find(':') != -1:
  46             a = line.split(':')
  47             thismsg = a[0].strip()
  48             if thismsg != msg:
  49                 continue
  50             ans = a[1].strip()
  51             if ans == "OK" or ans == "YES":
  52                 f.close()
  53                 return ANSWER_OK
  54             elif ans == "UNKNOWN":
  55                 f.close()
  56                 return ANSWER_UNKNOWN
  57             elif ans == "FAIL" or ans == "NO":
  58                 f.close()
  59                 return ANSWER_FAIL
  60             elif ans[0] == '"':
  61                 return (0, ans.strip('"'))
  62             elif ans[0] == "'":
  63                 return (0, ans.strip("'"))
  64             else:
  65                 m = re.match('\(\s*(-?\d+)\s*,\s*\"(.*)\"\s*\)', ans)
  66                 if m:
  67                     f.close()
  68                     return (int(m.group(1)), m.group(2))
  69                 else:
  70                     raise Utils.WafError("Bad answer format '%s' in %s" % (line, ca_file))
  71     f.close()
  72     add_answer(ca_file, msg, ANSWER_UNKNOWN)
  73     return ANSWER_UNKNOWN
  74
  75
  76 class cross_Popen(Utils.pproc.Popen):
  77     '''cross-compilation wrapper for Popen'''
  78     def __init__(*k, **kw):
  79         (obj, args) = k
  80
  81         if '--cross-execute' in args:
  82             # when --cross-execute is set, then change the arguments
  83             # to use the cross emulator
  84             i = args.index('--cross-execute')
  85             newargs = args[i+1].split()
  86             newargs.extend(args[0:i])
  87             args = newargs
  88         elif '--cross-answers' in args:
  89             # when --cross-answers is set, then change the arguments
  90             # to use the cross answers if available
  91             i = args.index('--cross-answers')
  92             ca_file = args[i+1]
  93             msg     = args[i+2]
  94             ans = cross_answer(ca_file, msg)
  95             if ans == ANSWER_UNKNOWN:
  96                 global cross_answers_incomplete
  97                 cross_answers_incomplete = True
  98             (retcode, retstring) = ans
  99             args = ['/bin/sh', '-c', "echo -n '%s'; exit %d" % (retstring, retcode)]
 100         real_Popen.__init__(*(obj, args), **kw)
 101
 102
 103 @conf
 104 def SAMBA_CROSS_ARGS(conf, msg=None):
 105     '''get exec_args to pass when running cross compiled binaries'''
 106     if not conf.env.CROSS_COMPILE:
 107         return []
 108
 109     global real_Popen
 110     if real_Popen is None:
 111         real_Popen  = Utils.pproc.Popen
 112         Utils.pproc.Popen = cross_Popen
 113
 114     ret = []
 115
 116     if conf.env.CROSS_EXECUTE:
 117         ret.extend(['--cross-execute', conf.env.CROSS_EXECUTE])
 118     elif conf.env.CROSS_ANSWERS:
 119         if msg is None:
 120             raise Utils.WafError("Cannot have NULL msg in cross-answers")
 121         ret.extend(['--cross-answers', os.path.join(Options.launch_dir, conf.env.CROSS_ANSWERS), msg])
 122
 123     if ret == []:
 124         raise Utils.WafError("Cannot cross-compile without either --cross-execute or --cross-answers")
 125
 126     return ret
 127
 128 @conf
 129 def SAMBA_CROSS_CHECK_COMPLETE(conf):
 130     '''check if we have some unanswered questions'''
 131     global cross_answers_incomplete
 132     if conf.env.CROSS_COMPILE and cross_answers_incomplete:
 133         raise Utils.WafError("Cross answers file %s is incomplete" % conf.env.CROSS_ANSWERS)
 134     return True