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bug#60116: ‘herd stop guix-daemon’ doesn’t stop running sessions
From: |
Ludovic Courtès |
Subject: |
bug#60116: ‘herd stop guix-daemon’ doesn’t stop running sessions |
Date: |
Fri, 16 Dec 2022 12:12:06 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Suppose you run a bunch of clients, ‘guix shell’, ‘guix build’,
whatever. For each of these connections, guix-daemon creates a child
process to handle it. (You can see them as “SessionPID” in the output
of ‘guix processes’.)
‘herd stop guix-daemon’ won’t stop these guix-daemon child processes,
only the parent process.
This is because those sub-processes put themselves in a separate process
group by calling ‘setsid’ (see ‘daemonLoop’ in ‘nix-daemon.cc’);
shepherd terminates the whole process group, but that group contains
nothing but the parent guix-daemon process. I traced back this ‘setsid’
call to 2006 in Nix (Nix commit
0130ef88ea280e67037fa76bcedc59db17d9a8ca), but there’s no justification.
I would be tempted to just remove that ‘setsid’ call, but I wonder if
there’s something subtle I’m overlooking.
Thoughts?
Ludo’.
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