#!/usr/bin/env python
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Test the --cache-readonly option when retrieving derived files from a
CacheDir. It should retrieve as normal but not update files.
"""

import os.path
import shutil

import TestSCons

test = TestSCons.TestSCons()

test.subdir('cache', 'src')

test.write(['src', 'SConstruct'], """
DefaultEnvironment(tools=[])
def cat(env, source, target):
    target = str(target[0])
    with open('cat.out', 'a') as f:
        f.write(target + "\\n")
    with open(target, "w") as f:
        for src in source:
            with open(str(src), "r") as f2:
                f.write(f2.read())
env = Environment(tools=[], BUILDERS={'Cat':Builder(action=cat)})
env.Cat('aaa.out', 'aaa.in')
env.Cat('bbb.out', 'bbb.in')
env.Cat('ccc.out', 'ccc.in')
env.Cat('all', ['aaa.out', 'bbb.out', 'ccc.out'])
CacheDir(r'%s')
""" % test.workpath('cache'))

test.write(['src', 'aaa.in'], "aaa.in\n")
test.write(['src', 'bbb.in'], "bbb.in\n")
test.write(['src', 'ccc.in'], "ccc.in\n")

# Verify that a normal build works correctly, and clean up.
# This should populate the cache with our derived files.
test.run(chdir = 'src', arguments = '.')

test.must_match(['src', 'all'], "aaa.in\nbbb.in\nccc.in\n", mode='r')
test.must_match(['src', 'cat.out'], "aaa.out\nbbb.out\nccc.out\nall\n", mode='r')

test.up_to_date(chdir = 'src', arguments = '.')

test.run(chdir = 'src', arguments = '-c .')
test.unlink(['src', 'cat.out'])

# Verify that we now retrieve the derived files from cache,
# not rebuild them.  Then clean up.
test.run(chdir = 'src', arguments = '--cache-readonly .',
         stdout = test.wrap_stdout("""\
Retrieved `aaa.out' from cache
Retrieved `bbb.out' from cache
Retrieved `ccc.out' from cache
Retrieved `all' from cache
"""))

test.must_match(['src', 'all'], "aaa.in\nbbb.in\nccc.in\n", mode='r')
test.must_not_exist(test.workpath('src', 'cat.out'))

test.up_to_date(chdir = 'src', arguments = '.')

test.run(chdir = 'src', arguments = '-c .')

# What we do now is to change one of the files and rebuild
test.write(['src', 'aaa.in'], "aaa.rebuild\n")

# This should just rebuild aaa.out (and all)
test.run(chdir = 'src',
         arguments = '--cache-readonly .',
         stdout = test.wrap_stdout("""\
cat(["aaa.out"], ["aaa.in"])
Retrieved `bbb.out' from cache
Retrieved `ccc.out' from cache
cat(["all"], ["aaa.out", "bbb.out", "ccc.out"])
"""))

test.must_match(['src', 'all'], "aaa.rebuild\nbbb.in\nccc.in\n", mode='r')
# cat.out contains only the things we built (not got from cache)
test.must_match(['src', 'cat.out'], "aaa.out\nall\n", mode='r')

test.up_to_date(chdir = 'src', arguments = '.')

test.run(chdir = 'src', arguments = '-c .')
test.unlink(['src', 'cat.out'])

# Verify that aaa.out contents weren't updated with the last build
# Then clean up.
test.run(chdir = 'src',
         arguments = '--cache-readonly .',
         stdout = test.wrap_stdout("""\
cat(["aaa.out"], ["aaa.in"])
Retrieved `bbb.out' from cache
Retrieved `ccc.out' from cache
cat(["all"], ["aaa.out", "bbb.out", "ccc.out"])
"""))

test.must_match(['src', 'all'], "aaa.rebuild\nbbb.in\nccc.in\n", mode='r')
test.must_match(['src', 'cat.out'], "aaa.out\nall\n", mode='r')

test.up_to_date(chdir = 'src', arguments = '.')

test.run(chdir = 'src', arguments = '-c .')
test.unlink(['src', 'cat.out'])

# All done.
test.pass_test()

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