Where is my umask being set to 0002?

[Chris Green]

On Wed, Apr 13, 2022 at 09:42:00AM -0400, Bijan Soleymani wrote:
> On 2022-04-13 08:06, Chris Green wrote:
> > On Wed, Apr 13, 2022 at 05:02:06AM -0700, Smoot Carl-Mitchell via ubuntu-users wrote:
> > > On Wed, 2022-04-13 at 11:41 +0200, Ralf Mardorf via ubuntu-users wrote:
> > > > Maybe in /etc/login.defs ?
> > > 
> > > You can set it in your .profile or your.bashrc startup file for the
> > > bash shell or in /etc/profile globally.
> > 
> > OP here, yes I know how to set the umask, what I was asking was where
> > is the default value set?
> > 
> 
> Seems it is set to 022 in /etc/logins.def
> 
> With the following comment:
> # If USERGROUPS_ENAB is set to "yes", that will modify this UMASK default
> value
> # for private user groups, i. e. the uid is the same as gid, and username is
> # the same as the primary group name: for these, the user permissions will
> be
> # used as group permissions, e. g. 022 will become 002.
> 
> And by default USERGROUPS_ENAB is set to yes. More comment from there:
> # Enable setting of the umask group bits to be the same as owner bits
> # (examples: 022 -> 002, 077 -> 007) for non-root users, if the uid is
> # the same as gid, and username is the same as the primary group name.
> #
> # If set to yes, userdel will remove the user's group if it contains no
> # more members, and useradd will create by default a group with the name
> # of the user.
> #
> USERGROUPS_ENAB yes
> 
> I can confirm that setting USERGROUPS_ENAB to no will change user umask to
> 0022.
> 
Brilliant, thank you!  That's the bit of information I had been
searching for and it explains the values of umask I'm seeing.  :-)

-- 
Chris Green