sgid bit is not inherited by few directories

suchitpati · 10-11-2016, 03:16 PM

OS : RHEL 7.2 64 bit
I have set the SGID bit on the parent directory using the command :

chmod 2775 <directory name>

Then I installed a tomcat based application on that directory (Just by unzipping the software zip file.. no other step).

However, some folder created during the unzipping process (and some directories may have been created afterwards by the application) did not inherit the SGID bit. (So, all the files under such directories were created with the default group, which is not correct).

But, Most of the directory got the Sgid bit from the parent directory, but few did not.

Has anyone faced this problem before? Any idea, what could have caused it?

MadeInGermany · 10-14-2016, 02:14 PM

Yes that happens when a directory is created with explicit permissions.
Like

Code:

mkdir -m 755 newdir

The explicit permissions override the inherited permissions.
When extracting a zip|tar|cpio archive, it tries to also restore the permissions from the archive - again overriding the inherited permissions.

suchitpati · 10-14-2016, 02:35 PM

Thanks a lot for your reply. I will check with our app team.

By the way, is there an option to use in order to prevent zip/tar/cpio from restoring permission from archive?

MadeInGermany · 10-15-2016, 09:49 AM

I think there is no such option.
You can study the man pages e.g.

Code:

man unzip

You better run a

Code:

find . -type d -exec chmod 2775 {} +

after an extraction.