[Scons-users] Intermittent Install() failure

Wed Jul 20 10:03:10 EDT 2016

Copying via what means? shutils?

On Wed, Jul 20, 2016 at 9:18 AM, Hill, Steve (FP COM) <Steve.Hill at cobham.com
> wrote:

> We do have builders like this, though I hope that they all use the ‘with
> file(“file”, “w”) as f:…’ construct. It is possible that one has slipped in
> without that – but not on the files that are causing this problem as some
> of them are literally copying a file under source control to another
> location…
>
>
>
> S.
>
>
>
>
>
>
>
> William,
>
> Indeed..
>
> -Bill
>
>
>
> On Tue, Jul 19, 2016 at 1:48 PM, William Blevins <wblevins001 at gmail.com>
> wrote:
>
> Bill,
>
> I assume you think this may be a problem with not explicitly closing the
> file? Relying on python garbage collection in this case would certainly be
> dangerous.
>
> V/R,
>
> William
>
>
>
> On Tue, Jul 19, 2016 at 6:22 PM, Bill Deegan <bill at baddogconsulting.com>
> wrote:
>
> 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.
>
>
>
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