CODEWITHSUNDEEP
pythonlinuxchmod
ScotchAndSoda
ScotchAndSoda

Reputation: 4191

chmod with group inheritance rights rwx for user & group only

In order to create a shared folder for a given group of users, I need restricted directory rights with inheritance. The goal is that only root and users members to the specified group can read & wright inside, by inheritating these rights for future content in my directory. Something like:

drwxrws--- 2 root terminator  6 28 mai   11:15 test

I am able to obtain this with 2 calls of chmod:

chgrp terminator test

chmod 770 test
chmod g+s

It would be nice to do this in one command using a numeric mask. I need to use a mask, because it is a python script who is supposed to do the job using os.chmod(). Thanks!

Upvotes: 3

Views: 4288

Answers (3)

Robert Hoffman
Robert Hoffman

Reputation: 24

You can set the sticky bit from the command line with one call of the chmod command like so:

chmod 2770 test

The preceding '2' sets the sticky bit for the group.

os.chmod() appears to need a preceeding zero so that it knows the digits are octal. I've tested the following successfully:

import os
os.chmod('test', 02770)

Upvotes: 0

mata
mata

Reputation: 69082

os.chmod does exactly the same as the chmod utility, but you need to remember that the argument to chmod is a string representing a bitmap in octal notation, not decimal. That means the equivalent to

chmod 2770 test

is

os.chmod('test', 0o2770)

You probably used os.chmod('test', 2770), which would be 5322 in octal, which is consistent whit the bitmask you seem to get.

Upvotes: 3

devnull
devnull

Reputation: 123608

chmod u+rwx,g+rws,o-rwx test should do what you want.

Alternatively, the following should do it from within a script:

import os
import stat
os.chmod('test', stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR | stat.S_IRGRP | stat.S_IWGRP | stat.S_ISGID)

Upvotes: 2

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