[Scons-users] Intermittent Install() failure

Tue Jul 19 07:52:47 EDT 2016

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.
>>
>>
>>
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