[Scons-users] Possible bug with cache and Value()

[Bill Deegan]

Rob,

At first glance looks like a bug on a code path which must not be covered
by our tests.
string vs bytes is a dead giveaway.

You must be running scons 3.0.1 with python 3.5+?
Can you try running with python 2.7.x? (It should work)

-Bill

On Wed, Nov 22, 2017 at 3:36 AM, Rob Spanton <rob at robspanton.com> wrote:

> Hi,
>
> I recently upgraded to scons 3.0.1, and I'm encountering a problem with
> using
> CacheDir() in combination with Value().  I can replicate the issue with
> this
> minimal SConstruct:
>
>     CacheDir("cache")
>     Command("somefile", Value("test"), "echo hi > $TARGET")
>
>     I've included the traceback that this produces at the end of this
> email.  I
>     think what I'm doing with CacheDir, Command and Value is legitimate
> but am
>     entirely happy to be persuaded that it is not!
>
>     I can work with this for the moment by disabling the cache, but it
> would be
>     useful if someone with some more in-depth scons knowledge than me
> could shed
>     some light on what's going on.
>
>     Thanks,
>
>     Rob Spanton
>
>     ---
>
>     scons: Reading SConscript files ...
>     scons: done reading SConscript files.
>     scons: Building targets ...
>     scons: *** [somefile] TypeError : sequence item 0: expected str
> instance, bytes found
>     Traceback (most recent call last):
>       File "/usr/lib/scons/SCons/Action.py", line 689, in __call__
>         cmd = self.strfunction(target, source, env, executor)
>     TypeError: CacheRetrieveString() takes 3 positional arguments but 4
> were given
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File "/usr/lib/scons/SCons/Taskmaster.py", line 241, in execute
>         if not t.retrieve_from_cache():
>       File "/usr/lib/scons/SCons/Node/FS.py", line 2925, in
> retrieve_from_cache
>         return self.get_build_env().get_CacheDir().retrieve(self)
>       File "/usr/lib/scons/SCons/CacheDir.py", line 263, in retrieve
>         if CacheRetrieve(node, [], env, execute=1) == 0:
>       File "/usr/lib/scons/SCons/Action.py", line 691, in __call__
>         cmd = self.strfunction(target, source, env)
>       File "/usr/lib/scons/SCons/CacheDir.py", line 66, in
> CacheRetrieveString
>         cachedir, cachefile = cd.cachepath(t)
>       File "/usr/lib/scons/SCons/CacheDir.py", line 224, in cachepath
>         sig = node.get_cachedir_bsig()
>       File "/usr/lib/scons/SCons/Node/FS.py", line 3391, in
> get_cachedir_bsig
>         result = self.cachesig = SCons.Util.MD5collect(sigs)
>       File "/usr/lib/scons/SCons/Util.py", line 1550, in MD5collect
>         return MD5signature(', '.join(signatures))
>     TypeError: sequence item 0: expected str instance, bytes found
>     scons: building terminated because of errors.
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