test/Decider/switch-rebuild.py

   1 #!/usr/bin/env python
   2 #
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   6 # a copy of this software and associated documentation files (the
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  10 # permit persons to whom the Software is furnished to do so, subject to
  11 # the following conditions:
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  16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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  21 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23 #
  24
  25 __revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
  26
  27 """
  28 Test that switching Decider() types between MD5 and timestamp-match
  29 does not cause unnecessary rebuilds.
  30 """
  31
  32 import TestSCons
  33
  34 test = TestSCons.TestSCons(match=TestSCons.match_re_dotall)
  35
  36 base_sconstruct_contents = """\
  37 DefaultEnvironment(tools=[])
  38 Decider('%s')
  39
  40 def build(env, target, source):
  41     with open(str(target[0]), 'wt') as f, open(str(source[0]), 'rt') as ifp:
  42         f.write(ifp.read())
  43 B = Builder(action=build)
  44 env = Environment(tools=[], BUILDERS = { 'B' : B })
  45 env.B(target='switch.out', source='switch.in')
  46 """
  47
  48 def write_SConstruct(test, sig_type):
  49     contents = base_sconstruct_contents % sig_type
  50     test.write('SConstruct', contents)
  51
  52
  53 # Build first MD5 checksums.
  54 write_SConstruct(test, 'MD5')
  55
  56 test.write('switch.in', "switch.in\n")
  57
  58 switch_out_switch_in = test.wrap_stdout(r'build\(\["switch.out"\], \["switch.in"\]\)\n')
  59
  60 test.run(arguments='switch.out', stdout=switch_out_switch_in)
  61
  62 test.up_to_date(arguments='switch.out')
  63
  64
  65 # Now rebuild with timestamp-match.  Because we always store timestamps,
  66 # even when making the decision based on MD5 checksums, the build is
  67 # still up to date.
  68 write_SConstruct(test, 'timestamp-match')
  69
  70 test.up_to_date(arguments='switch.out')
  71
  72
  73 # Now switch back to MD5 checksums.  When we rebuilt with the timestamp,
  74 # it wiped out the MD5 value (because the point of timestamps is to not
  75 # open up and checksum the contents), so the file is considered *not*
  76 # up to date and must be rebuilt to generate a checksum.
  77 write_SConstruct(test, 'MD5')
  78
  79 test.not_up_to_date(arguments='switch.out')
  80
  81
  82 # And just for good measure, make sure that we now rebuild in response
  83 # to a content change.
  84 test.write('switch.in', "switch.in 2\n")
  85
  86 test.run(arguments='switch.out', stdout=switch_out_switch_in)
  87
  88
  89 test.pass_test()
  90
  91 # Local Variables:
  92 # tab-width:4
  93 # indent-tabs-mode:nil
  94 # End:
  95 # vim: set expandtab tabstop=4 shiftwidth=4: