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* Move the definition of the Nix build users out of user-groups.nix to

Browse source 
nix-daemon.nix.
* Add an option ‘nix.nrBuildUsers’ to allow the number of build users
  to be overriden.

svn path=/nixos/trunk/; revision=20571
This commit is contained in:
Eelco Dolstra 2010-03-11 16:50:08 +00:00
parent 131b1e57fe
commit a104f07a07
2 changed files with 29 additions and 15 deletions
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16
modules/config/users-groups.nix
View file

@ -24,20 +24,6 @@ let
}
];
makeNixBuildUser = nr:
{ name = "nixbld${toString nr}";
description = "Nix build user ${toString nr}";
/* For consistency with the setgid(2), setuid(2), and setgroups(2)
calls in `libstore/build.cc', don't add any supplementary group
here. */
uid = builtins.add ids.uids.nixbld nr;
group = "nixbld";
extraGroups = [];
};
nixBuildUsers = map makeNixBuildUser (pkgs.lib.range 1 10);
addAttrs =
{ name
, description
@ -52,7 +38,7 @@ let
}:
{ inherit name description uid group extraGroups home shell createHome password; };
in map addAttrs (defaultUsers ++ nixBuildUsers ++ config.users.extraUsers);
in map addAttrs (defaultUsers ++ config.users.extraUsers);
# Groups to be created/updated by NixOS.

28
modules/services/misc/nix-daemon.nix
View file

@ -5,6 +5,18 @@ with pkgs.lib;
let
inherit (config.environment) nix;
makeNixBuildUser = nr:
{ name = "nixbld${toString nr}";
description = "Nix build user ${toString nr}";
/* For consistency with the setgid(2), setuid(2), and setgroups(2)
calls in `libstore/build.cc', don't add any supplementary group
here. */
uid = builtins.add config.ids.uids.nixbld nr;
group = "nixbld";
extraGroups = [];
};
in
@ -148,6 +160,17 @@ in
Environment variables used by Nix.
";
};
nrBuildUsers = mkOption {
default = 10;
description = ''
Number of <literal>nixbld</literal> user accounts created to
perform secure concurrent builds. If you receive an error
message saying that “all build users are currently in use”,
you should increase this value.
'';
};
};
};
@ -213,6 +236,9 @@ in
''
export PATH=${if config.nix.distributedBuilds then "${pkgs.openssh}/bin:${pkgs.gzip}/bin:" else ""}${pkgs.openssl}/bin:${nix}/bin:$PATH
${config.nix.envVars}
# To reduce the load on Hydra, don't start all those
# unnecessary substituter processes.
export NIX_SUBSTITUTERS=
exec \
nice -n ${builtins.toString config.nix.daemonNiceLevel} \
${pkgs.utillinux}/bin/ionice -n ${builtins.toString config.nix.daemonIONiceLevel} \
@ -261,6 +287,8 @@ in
export ftp_proxy=${config.nix.proxy}
'';
users.extraUsers = map makeNixBuildUser (pkgs.lib.range 1 config.nix.nrBuildUsers);
};
}