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

Steve Dower steve.dower at python.org
Sat Mar 30 12:00:13 EDT 2019

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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