On Mon, Sep 25, 2023 at 11:58:13AM +0900, John Crawley wrote: > adduser tmp > adduser tmp sudo > > Log in to tmp (no graphical session set up), and the results are the same: > behaviour in a bash shell is wrong, everything else works.
I simply can't reproduce your results at all. unicorn:~$ sudo adduser test2 [...] unicorn:~$ sudo adduser test2 sudo [...] unicorn:~$ su - test2 Password: test2@unicorn:~$ id uid=1001(test2) gid=1001(test2) groups=1001(test2),27(sudo),100(users) test2@unicorn:~$ errors=$(sudo apt-get install mirage 2>&1 1>/dev/tty) [sudo] password for test2: Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be installed: gir1.2-gexiv2-0.10 gir1.2-gtk-3.0 libexiv2-27 libgexiv2-2 python3-cairo python3-gi python3-gi-cairo Suggested packages: exiv2 gimp The following NEW packages will be installed: gir1.2-gexiv2-0.10 gir1.2-gtk-3.0 libexiv2-27 libgexiv2-2 mirage python3-cairo python3-gi python3-gi-cairo 0 upgraded, 8 newly installed, 0 to remove and 0 not upgraded. Need to get 2,249 kB of archives. After this operation, 10.5 MB of additional disk space will be used. Do you want to continue? [Y/n] n Abort. test2@unicorn:~$ This leaves me very confused. There's something different about your systems compared to mine (and the other person who also could not reproduce your results), but damned if I can guess *what*. The only other experiment I can think of at this time would be: 4) In a bash shell as root (e.g. "su" or "sudo -s"), do: errors=$(apt-get install mirage 2>&1 1>/dev/tty) This removes sudo from the picture. But I don't know what the results will tell us. I can generate the *message* that you get by redirecting stdin: unicorn:~$ sudo apt-get install mirage 0</dev/null Reading package lists... Done Building dependency tree... Done Reading state information... Done The following additional packages will be installed: gir1.2-gexiv2-0.10 gir1.2-gtk-3.0 libexiv2-27 libgexiv2-2 python3-cairo python3-gi python3-gi-cairo Suggested packages: exiv2 gimp The following NEW packages will be installed: gir1.2-gexiv2-0.10 gir1.2-gtk-3.0 libexiv2-27 libgexiv2-2 mirage python3-cairo python3-gi python3-gi-cairo 0 upgraded, 8 newly installed, 0 to remove and 0 not upgraded. Need to get 2,249 kB of archives. After this operation, 10.5 MB of additional disk space will be used. Do you want to continue? [Y/n] Abort. But there's nothing you've shown that's redirecting stdin, so I don't know whether this is what's causing your problem or not. If it *is* what's causing your problem, I still don't have a clue what's *doing* it. Is there any unusual configuration of sudo on your system? Sudo configuration is utterly baffling, and about 2 orders of magnitude more stupidly complex than it should be, so I don't even know what kind of atrocities are *possible* in sudoers, let alone which of them might be capable of doing something insane like closing stdin on commands run via sudo. But if you've changed anything in sudoers or sudoers.d you might want to report on those changes. (But why would this only happen when sudo's parent is bash? None of this makes *any* sense.)
