On 05/12/2025 19:48, Corinna Vinschen via Cygwin wrote:
On Dec 5 19:30, Corinna Vinschen via Cygwin wrote:
On Dec 5 13:40, Corinna Vinschen via Cygwin wrote:
On Dec 5 09:28, Marco Atzeri via Cygwin wrote:
On 04/12/2025 21:50, Brian Inglis via Cygwin wrote:
On 2025-12-04 08:00, Jon Turney via Cygwin wrote:
Actually, I think this is a shortcoming of the cygwin version of newgrp.
The SUS description [1] of newgrp allows a numeric group id to be
specified.
(In fact, it includes the clarifying remark "If group is a non-
negative numeric string and exists in the group database as a group
name, the numeric group ID associated with that group name will be
used as the group ID", which suggests a, um, straightforward
implementation)
But it seems that our implementation only currently handles a group
name (See [2]).
[1] https://pubs.opengroup.org/onlinepubs/7908799/xcu/newgrp.html
That's OG SUSV2 1997 - current is at:
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/newgrp.html
[2] https://cygwin.com/cgit/newlib-cygwin/tree/winsup/utils/newgrp.c#n166
Shouldn't be too hard to add to our newgrp(1).
Uhm... there's a problem here.
Right now, our newgrp is commandline compatible with Linux' newgrp from
shadow-utils:
- A single '-' reinitializes the environment.
- The group must be given as name, not as GID.
This is not commandline compatible with the POSIX definition:
- A '-l' reinitializes the environment.
- The group may be given as name or GID.
I can't just change it to POSIX compatible because this potentially
breaks Linux compatibility.
What we could do is to check the POSIXLY_CORRECT environment variable
and switch the identity to POSIX if this variable is set.
Make sense?
No, scratch that, it's much eaiser. shadow-utils newgrp let's -l slip
through, any other -X results in a usage message. I can change Cygwin's
newgrp accordingly.
The only non-compatibility is that Cygwin's newgrp allows to specify a
command. shadow-utils nad POSIX newgrp only create a new shell
environment.
I guess we can ignore this...
Corinna
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