[Scons-users] Intermittent Install() failure

Bill Deegan bill at baddogconsulting.com
Tue Jul 19 13:22:57 EDT 2016 

Steve,

Do you have any python logic creating the files in the SCons process? (a
builder where the builder actuall does open('file','w').. to create the
file?

-Bill

On Tue, Jul 19, 2016 at 7:55 AM, William Blevins <wblevins001 at gmail.com>
wrote:

> Steve,
>
> As a final thought, I have used SCons to build HT 24-core server blades
> (so 48 w/ HT) that RAM boot (no harddrive at RT). If it was specific to the
> core package, I imagine I would have seen this issue tons.
>
> V/R,
> William
>
> On Tue, Jul 19, 2016 at 12:52 PM, William Blevins <wblevins001 at gmail.com>
> wrote:
>
>> Vasily,
>>
>> I think you are referring to Precious.
>>
>> V/R,
>> William
>>
>> On Tue, Jul 19, 2016 at 9:51 AM, Vasily <just.one.man at yandex.ru> wrote:
>>
>>> Hi Steve,
>>>
>>> What does your build do with this file except installing it? Is it used
>>> by a compiler or some other tool?
>>>
>>> Also, if I'm not mistaken, default SCons behavior is to remove the
>>> target before performing any action to regenerate it, so this might be the
>>> source of the exception you're seeing. There seems to be a way to turn off
>>> the removal part of the action, so you may want to check the manual and see
>>> if it helps you.
>>>
>>> P.S. Based on file path I assume you're working on Windows, is this path
>>> a network one?
>>>
>>> Thanks,
>>> Vasily
>>> 19 июля 2016 г. 11:02 пользователь "Hill, Steve (FP COM)" <
>>> Steve.Hill at cobham.com> написал:
>>>
>>> Thanks William.
>>>>
>>>>
>>>>
>>>> I’ve checked the dependency tree and, as far as I can tell, it looks OK.
>>>>
>>>> We do have custom scanners – using env.Scanner(_scan_domain_header) –
>>>> but not for the files that are affected.
>>>>
>>>> As far as I can see, the fix for that Python bug never made it into
>>>> 2.6.x but it appears always to result in a “No child processes” OSError so
>>>> I don’t believe that is what I am seeing.
>>>>
>>>>
>>>>
>>>> Note that I have (temporarily) changed the decider below to simply
>>>> return True (without doing anything with the file) and I still see the
>>>> issue so the decider doesn’t seem to be relevant to the issue.
>>>>
>>>>
>>>>
>>>> Does anyone have any more ideas? This is becoming a major issue for our
>>>> automated builds…
>>>>
>>>>
>>>>
>>>> S.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Steve,
>>>>
>>>> I of course should have asked the obvious question, do you know if you
>>>> dependency tree has missing dependencies? This tends to be a common issue.
>>>>
>>>> V/R,
>>>>
>>>> William
>>>>
>>>>
>>>>
>>>> On Fri, Jul 15, 2016 at 5:14 PM, William Blevins <wblevins001 at gmail.com>
>>>> wrote:
>>>>
>>>> Steve,
>>>>
>>>> I'm not aware of any specific issue with install, but there are some
>>>> possible issues that I am aware:
>>>>
>>>>    1. If you have custom scanners, make sure they implement from
>>>>    SCons.Scanner.Current and not SCons.Scanner.Base; otherwise, you might have
>>>>    concurrent file access between implicit scanning operations and other
>>>>    processes.
>>>>    2. There was a big subprocess bug in python 2.6 that carried
>>>>    through several other major versions:
>>>>    https://bugs.python.org/issue1731717. I would check to see that
>>>>    your version of 2.6 contains the patch for this issue.
>>>>
>>>> V/R,
>>>>
>>>> William
>>>>
>>>>
>>>>
>>>> On Fri, Jul 15, 2016 at 9:30 AM, Hill, Steve (FP COM) <
>>>> Steve.Hill at cobham.com> wrote:
>>>>
>>>> I’m having a problem where, with parallel builds (most people use 8, 12
>>>> or 16 threads), we occasionally get failures like the following:
>>>>
>>>>
>>>>
>>>> F:\<directory path>\hw_cfgs\1Server_1TM_6C66_2U.cfg: The process cannot access the file because it is being used by another process
>>>> scons: building terminated because of errors.
>>>>
>>>>
>>>>
>>>> We are running Python 2.6.5 (with pywin32) and SCons 2.3.6. This file
>>>> is being copied due to a Install() call. Note that, for various historical
>>>> reasons, we have the following decider for these Installs:
>>>>
>>>>
>>>>
>>>> def _copy_decider(dependency, target, prev_ni):
>>>>
>>>>     target = str(target.abspath)
>>>>
>>>>     dependency = str(dependency.abspath)
>>>>
>>>>     if os.path.isfile(target) and os.path.isfile(dependency):
>>>>
>>>> *        # By default, filecmp.cmp assumes that files with identical
>>>> os.stat signatures*
>>>>
>>>> *        # (which includes the inode) are the same file and, hence,
>>>> must be the same.*
>>>>
>>>> *        # However, on Windows, there is no inode - it appears to be
>>>> set to zero - so*
>>>>
>>>> *        # any two files with the same size and
>>>> access/creation/modification times*
>>>>
>>>> *        # will have the same os.stat signature, leading to a false
>>>> positive. For this*
>>>>
>>>> *        # reason, we must force it to do an actual file comparison by
>>>> setting shallow*
>>>>
>>>> *        # to False*
>>>>
>>>>         return not filecmp.cmp(target, dependency, shallow = False)
>>>>
>>>>     else:
>>>>
>>>> *        # Either one of the dependency or target isn't a file or one
>>>> of the files*
>>>>
>>>> *        # (presumably the target) isn't there so do the copy*
>>>>
>>>>         return True
>>>>
>>>>
>>>>
>>>> Note also that our IT department claims that virus checkers are
>>>> disabled within the directory where the build is being performed (and we
>>>> certainly have not seen any indication in the virus checker console to
>>>> suggest that to be incorrect).
>>>>
>>>>
>>>>
>>>> Does anyone have any thoughts as to what the problem might be?
>>>>
>>>>
>>>>
>>>> Thanks in advance,
>>>>
>>>>
>>>>
>>>> S.
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Scons-users mailing list
>>>> Scons-users at scons.org
>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Scons-users mailing list
>>>> Scons-users at scons.org
>>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>>
>>>>
>>> _______________________________________________
>>> Scons-users mailing list
>>> Scons-users at scons.org
>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>
>>>
>>
>
> _______________________________________________
> Scons-users mailing list
> Scons-users at scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist4.pair.net/pipermail/scons-users/attachments/20160719/5b91cb4f/attachment.html>

More information about the Scons-users mailing list