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Re: Integration of the Nix daemon

From: Andreas Enge
Subject: Re: Integration of the Nix daemon
Date: Sun, 16 Dec 2012 12:16:51 +0100
User-agent: KMail/1.13.7 (Linux/3.2.0-4-amd64; KDE/4.8.4; x86_64; ; )

Am Samstag, 15. Dezember 2012 schrieb Ludovic Courtès:

> First, guix-daemon is running as root, right?


Yes, in a separate terminal as

NIX_SUBSTITUTERS="" guix-daemon --build-users-group=nixbld


> That seems to suggest that there’s a lock on each of these. What does

> ‘ls -l /nix/var/nix/userpool/’ report?


-rw------- 1 root root 0 Dez 10 23:30 30001


/etc/group contains a line



and /etc/passwd:

nixbld1:x:30001:65534:Nix build user 1:/var/empty:/noshell


nixbld10:x:30001:65534:Nix build user 10:/var/empty:/noshell


> Can you also try running guix-daemon in strace, and then check then

> fcntl(fd, F_SETLKW, _) calls for user locks?


I find none of these:

strace ./pre-inst-env guix-build hello 2>&1 | grep fcntl | grep F_SETLKW

returns nothing.




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