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

Ivan Pozdeev vano at mail.mipt.ru
Sat Mar 30 14:26:30 EDT 2019

On 30.03.2019 19:00, Steve Dower 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/testpython5154/@test5154tmp-tardir/tmp.tar", OWRONLY|OCREAT|OTRUNC|OCLOEXEC, 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/testpython5154/@test5154tmp-tardir/tmp.tar", {stmode=SIFREG|0666, stsize=46, ...}) = 0 Happy to take more suggestions if anyone has them.

According to https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops&tabs=yaml#use-a-microsoft-hosted-agent , MS uses Ubuntu 16.04

http://manpages.ubuntu.com/manpages/xenial/man2/umask.2.html suggests that umask is ignored if the parent directory has a default ACL (a newly-created dir inherits those from its parent).

As per https://linuxconfig.org/how-to-manage-acls-on-linux , the following commands should show if acls are enabled on the current FS and if any are active on the dir:

DEVICE=$(df | tail -n +2 | awk '{print $1}') sudo tune2fs -l $DEVICE | grep -w "Default mount options" mount | grep -w $DEVICE getfacl

In `getfacl' output for a directory, entries that start with "default:" list the default ACL .

`setfacl -b ' removes all ACLs from location.

Thanks, Steve

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-- Regards, Ivan

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