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SCons / test / Alias / srcdir.py

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#!/usr/bin/env python
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"""
Verify that an Alias for a VariantDir()'s source directory works as
expected.

This tests for a 0.96.93 bug uncovered by the LilyPond project's build.

The specific problem is that, in 0.96.93, the simple act of trying to
disambiguate a target file in the VariantDir() would call srcnode(), which
would create a "phantom" Node for the target in the *source* directory:

        +-minimal
          +-python
            +-foo               <= this doesn't belong!
            +-foo.py
            +-out-scons
              +-foo             <= this is all right
              +-foo.py

As part of deciding if the 'minimal' Alias is up-to-date, the 'python'
source directory would get scanned for files, including the "phantom"
'python/foo' target Node.  Since this didn't exist, the build would die:

    scons: *** Source `python/foo' not found, needed by target `minimal'.  Stop.

The specific 0.96.94 solution was to make the Node.FS.Entry.disambiguate()
smarter about looking on disk.  Future versions may solve this in other
ways as the architecture evolves, of course, but this will still make
for good test case regardless.
"""

import TestSCons

test = TestSCons.TestSCons()

test.subdir('python')

test.write('SConstruct', """\
import os.path

env = Environment ()

def at_copy_ext (target, source, env):
    n = str (source[0])
    s = open (n, 'rb').read ()
    e = os.path.splitext (n)[1]
    t = str (target[0]) + e
    open (t, 'wb').write (s)

AT_COPY_EXT = Builder (action = at_copy_ext, src_suffix=['.py', '.sh',])
env.Append (BUILDERS = {'AT_COPY_EXT': AT_COPY_EXT})

env.Alias ('minimal', ['python'])

Export ('env')

b = 'python/out-scons'

env.VariantDir(b, 'python', duplicate=0)

SConscript(b + '/SConscript')
""")

test.write(['python', 'SConscript'], """\
Import ('env')
env.AT_COPY_EXT('foo.py')
""")

test.write(['python', 'foo.py'], 'python/foo.py\n')

test.run('minimal')

test.must_match(['python', 'out-scons', 'foo.py'], "python/foo.py\n")

test.pass_test()

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