Mail Archives: cygwin/2014/01/08/12:49:54
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On Jan 8 12:07, John Smith wrote:
> >That's not how it works for me, even with Notepad. It only changes
> >the file content, not the ownership.
>=20
> If you create a file outside of cygwin, you should see it as a group
> of none, correct? Then if you update that file's group using cygwin
> to "chgrp Users", cygwin reports that file correctly changed groups.
> But the problem comes now when I that file again outside of cygwin,
> then look at the file again in cygwin, the group has once again
> reverted to ?????. I don't recall seeing this happen on a previous
> install (I've used cygwin for years) but some new things for me is
> that I'm running Win 8.1 (user is that windows live account) and I'm
> also trying out cygwin64.
>=20
> Are you able to test this
Almost. I'm using a domain user account but the mechanism is the same.
> and say you are not seeing this?
I'm not seeing this. Creating the file with Notepad sets user and group
to myself and my primary domain group. `Chgrp Users' on that file
changes the group to the group Users, which is a local (=3D=3Dnon-domain)
predefined group, which is confirmed by ls -l. Then I start Notepad
on the same file again, change it, and save the changes. Afterwards,
the file's group is still "Users".
> >>In *nix, once you change a group, just editing a file won't change
> >>the group back to something else.
> >
> >That doesn't happen on Cygwin, too.
>=20
> This is the behavior I'm seeing -- so maybe cygwin isn't really able
> to change the group, then?
Yes, it can. Changing the group does change the security descriptor on
disk. The effect you're seeing is weird, but it's not how Cygwin
usually works.
> But again once I
> edit that file the group reverts to ???? and I lose group
> permissions again. I don't get it.
Me neither. But see below.
> My apologies, I was just thinking that if I could get my programs to
> open up and make them set the default group to Users whenever they
> add/edit/update/etc a file that might solve the issue, but I am not
> sure that will at this point. And I'd have to find some way to do
> that across the board, which I think you said wouldn't work.
It works for Cygwin and non-Cygwin processes started from a Cygwin process.
It does not work for processes started from explorer.
OTOH, I don't understand what you're trying to accomplish. You can just
change the name of the "none" (or "HomeUser", see below) group in
/etc/group and be happy. The group membership doesn't really matter on
a non-domain standalone system anyway.
> > Try the icacls command on a file to see
> >what it prints and compare the info with your passwd and group files.
>=20
> I'm not sure how to read this. It's giving me a list of
> permissions, but how do I know what group cygwin sees?
You don't. Windows doesn't use the primary group field for any
purpose, so there's no reason for a WIndows tool to print the
primary group. At least, so far Windows never used the primary
group for any purpose, but see below.
> I can
> understand this is the hierarchy of permissions, but I don't see a
> "none" group anywhere --
It's not a hirarchy. It's just a list. And, yes, the None group
is missing. But here I'm wondering. Do you have the HomeUsers
group in /etc/group? If not, add it.
I can't be sure, but it seems that Windows uses that group as primary
group if you're using the HomeGroup sharing stuff, which I have no
experience with. I tried to reproduce this, but this is apparently not
enabled on enterprise systems. But I read a bit about it, and it
seems to have a life on its own, for instance:
http://www.tomshardware.co.uk/forum/27119-63-remove-user-homeusers-win7
http://social.technet.microsoft.com/Forums/windows/en-US/4d059295-838e-4e=
81-9658-823897a5bda2/
Probably best not to use it and only use normal workgroup sharing.
> icacls cc.txt
> cc.txt WHITELANCER\John:(RX)
> Whitelancer\HomeUsers:(I)(RX)
> BUILTIN\Administrators:(I)(F)
> NT AUTHORITY\SYSTEM:(I)(F)
> WHITELANCER\John:(I)(F)
> Everyone:(I)(RX)
>=20
> If that is the case, how do I make a manual entry in my /etc/group
> for a "John" group?
Don't. That's your user account. It doesn't belong into /etc/group.
Corinna
--=20
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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