GNU bug report logs - #72337
Add /etc/subuid and /etc/subgid support

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Message #50 received at 72337 <at> debbugs.gnu.org (full text, mbox):

From: paul <goodoldpaul <at> autistici.org>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 72337 <at> debbugs.gnu.org, Maxim Cournoyer <maxim.cournoyer <at> gmail.com>,
 Florian Pelz <pelzflorian <at> pelzflorian.de>,
 Matthew Trzcinski <matt <at> excalamus.com>
Subject: Re: bug#72337: Add /etc/subuid and /etc/subgid support
Date: Sat, 7 Sep 2024 22:44:19 +0200

Hi Ludo’ ,

I'm sending an updated v4 patchset that should address most your 
comments. One point I'm not sure about is still how to use newuidmap. 
I've added a smoke test checking the content of /proc/self/uid_map 
inside a podman unshare command. I'm not sure that is sufficient but for 
a full Guile implementation I would wait for another issue if you agree. 
I still have to find a reliable smoke test. This is something I've been 
trying, without success so far :( .

(use-modules (ice-9 popen)
             ;(ice-9 rdelim)
             )


(define pid (primitive-fork))

(if (= 0 pid)
    (let ((port (pk 'port (open-output-pipe "bash"))))
      (sleep 1)
      (display "whoami\n" port)
      (display "cat /proc/self/uid_map\n" port)
      (display "cat /proc/self/gid_map\n" port)
      (if (not (eqv? 0 (status:exit-val (close-pipe port))))
          (error "Cannot run command")))
    (begin
      (system* "newuidmap" (number->string pid) "paul" "165536" "65536")))



Thank you for all your help in polishing this service,


giacomo

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