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 -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
