[Python-Dev] Strange umask(?)/st_mode issue

[Gregory P. Smith]

I wouldn't expect it to be the case in a CI environment but I believe a
umask can be overridden if the filesystem is mounted and configured with
acls set?  (oh, hah, Ivan just said the same thing)

-gps

On Sat, Mar 30, 2019 at 9:05 AM Steve Dower <steve.dower at python.org> wrote:

> On 29Mar.2019 1944, Steve Dower wrote:
> > On 29Mar.2019 1939, Cameron Simpson wrote:
> >> Can you get a branch into your pipeline? Then you could just hack the
> >> tarfile test with something quick and dirty like:
> >>
> >>    pid = os.getpid()
> >>    system("strace -p %d 2>/path/to/strace.out &" % pid)
> >>    time.sleep(2)   # get strace heaps of time to start
> >>
> >> just before the tarfile open. A ghastly hack but it would get you
> >> debugging info. You could even decide to remove the strace.out file if
> >> the umask issue doesn't show, if it is erratic (can't see why it would
> >> be though).
> >
> > Perfect, I'll give this a go. Thanks!
>
> I set up a PR to collect this trace and the results are at:
> https://github.com/python/cpython/pull/12625
>
> However, I suspect it's a non-result:
>
> umask(022)                              = 022
>
> open("/home/vsts/work/1/s/build/test_python_5154/@test_5154_tmp-tardir/tmp.tar",
> O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 3
> write(3, "BZh91AY&SYY{\270\344\0\0\24P\0\300\0\4\0\0\10
> \0000\314\5)\246"..., 46) = 46
> close(3)                                = 0
>
> stat("/home/vsts/work/1/s/build/test_python_5154/@test_5154_tmp-tardir/tmp.tar",
> {st_mode=S_IFREG|0666, st_size=46, ...}) = 0
>
> Happy to take more suggestions if anyone has them.
>
> Thanks,
> Steve
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