Add a test of switching back and forth between Decider() values

(specifically 'MD5' and 'timestamp-match'), copied from back when
this functionality was configured with the SourceSignatures() function.

1 files changed, 93 insertions, 0 deletions

diff --git a/test/Decider/switch-rebuild.py b/test/Decider/switch-rebuild.py
new file mode 100644
index 00000000..45becbeb
--- /dev/null
+++ b/test/Decider/switch-rebuild.py
@@ -0,0 +1,93 @@
+#!/usr/bin/env python
+#
+# __COPYRIGHT__
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+#
+
+__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
+
+"""
+Test that switching Decider() types between MD5 and timestamp-match
+does not cause unnecessary rebuilds.
+"""
+
+import TestSCons
+
+test = TestSCons.TestSCons(match=TestSCons.match_re_dotall)
+
+base_sconstruct_contents = """\
+Decider('%s')
+
+def build(env, target, source):
+    open(str(target[0]), 'wt').write(open(str(source[0]), 'rt').read())
+B = Builder(action=build)
+env = Environment(BUILDERS = { 'B' : B })
+env.B(target='switch.out', source='switch.in')
+"""
+
+def write_SConstruct(test, sig_type):
+    contents = base_sconstruct_contents % sig_type
+    test.write('SConstruct', contents)
+
+
+# Build first MD5 checksums.
+write_SConstruct(test, 'MD5')
+
+test.write('switch.in', "switch.in\n")
+
+switch_out_switch_in = test.wrap_stdout(r'build\(\["switch.out"\], \["switch.in"\]\)\n')
+
+test.run(arguments='switch.out', stdout=switch_out_switch_in)
+
+test.up_to_date(arguments='switch.out')
+
+
+# Now rebuild with timestamp-match.  Because we always store timestamps,
+# even when making the decision based on MD5 checksums, the build is
+# still up to date.
+write_SConstruct(test, 'timestamp-match')
+
+test.up_to_date(arguments='switch.out')
+
+
+# Now switch back to MD5 checksums.  When we rebuilt with the timestamp,
+# it wiped out the MD5 value (because the point of timestamps is to not
+# open up and checksum the contents), so the file is considered *not*
+# up to date and must be rebuilt to generate a checksum.
+write_SConstruct(test, 'MD5')
+
+test.not_up_to_date(arguments='switch.out')
+
+
+# And just for good measure, make sure that we now rebuild in response
+# to a content change.
+test.write('switch.in', "switch.in 2\n")
+
+test.run(arguments='switch.out', stdout=switch_out_switch_in)
+
+
+test.pass_test()
+
+# Local Variables:
+# tab-width:4
+# indent-tabs-mode:nil
+# End:
+# vim: set expandtab tabstop=4 shiftwidth=4: