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|
{ pkgs, config, lib, ... }:
with lib;
let
cfg = config.networking.namespaces;
containerOpts = { name, ... }: {
options = {
config = mkOption {
description = ''
A specification of the desired configuration of this
container, as a NixOS module.
'';
type = let
confPkgs = if config.pkgs == null then pkgs else config.pkgs;
in mkOptionType {
name = "Toplevel NixOS config";
merge = loc: defs: (import (pkgs.path + "/nixos/lib/eval-config.nix") {
inherit (config.nixpkgs.localSystem) system;
inherit pkgs;
baseModules = import (pkgs.path + "/nixos/modules/module-list.nix");
inherit (pkgs) lib;
modules =
let
extraConfig = {
_file = "module at ${__curPos.file}:${toString __curPos.line}";
config = {
boot.isContainer = true;
networking.hostName = mkDefault name;
system.stateVersion = config.system.nixos.release; # No state
};
};
in [ extraConfig ] ++ (map (x: x.value) defs);
prefix = [ "containers" "upstream" ];
}).config;
};
};
netns = mkOption {
example = "upstream";
type = types.str;
description = "Name of network namespace to put the container in.";
};
};
config = {
netns = mkDefault name;
};
};
mkContainerService = containerName: containerCfg: nameValuePair "netns-container@${containerName}" {
after = ["network.target" "systemd-udevd.service" "systemd-sysctl.service" "netns@${containerCfg.netns}.service"];
bindsTo = ["netns@${containerCfg.netns}.service"];
before = ["shutdown.target"];
wants = ["network.target"];
conflicts = ["shutdown.target"];
path = with pkgs; [ iproute2 config.systemd.package ];
serviceConfig = {
SyslogIdentifier = "netns container ${containerName}";
Type = "notify";
RestartForceExitStatus = "133";
SuccessExitStatus = "133";
Restart = "no";
DevicePolicy = "closed";
RuntimeDirectory = ["netns-containers/${containerName}"];
};
unitConfig = {
ConditionCapability = ["CAP_SYS_TTY_CONFIG" "CAP_NET_ADMIN" "CAP_NET_RAW" "CAP_SYS_ADMIN"];
};
script = let
containerInit = pkgs.writeScript "container-init" ''
#!${pkgs.runtimeShell} -e
exec "$1"
'';
in ''
mkdir -p -m 0755 "''${RUNTIME_DIRECTORY}/etc" "''${RUNTIME_DIRECTORY}/var/lib"
mkdir -p -m 0700 "''${RUNTIME_DIRECTORY}/var/lib/private" "''${RUNTIME_DIRECTORY}/root" /run/containers
if ! [ -e "''${RUNTIME_DIRECTORY}/etc/os-release" ]; then
touch "''${RUNTIME_DIRECTORY}/etc/os-release"
fi
if ! [ -e "''${RUNTIME_DIRECTORY}/etc/machine-id" ]; then
touch "''${RUNTIME_DIRECTORY}/etc/machine-id"
fi
mkdir -p -m 0755 \
"/nix/var/nix/profiles/per-container/${containerName}" \
"/nix/var/nix/gcroots/per-container/${containerName}"
credsBind=()
if [ -n "''${CREDENTIALS_DIRECTORY}" ]; then
while IFS= read -r -d $'\0' credFile; do
credsBind+=("--load-credential=$(basename "''${credFile}"):''${credFile}")
done < <(find ''${CREDENTIALS_DIRECTORY} -type f -print0)
fi
# Run systemd-nspawn without startup notification (we'll
# wait for the container systemd to signal readiness).
exec ${config.systemd.package}/bin/systemd-nspawn \
--keep-unit \
-M "${containerName}" -D "''${RUNTIME_DIRECTORY}" \
--notify-ready=yes \
--bind-ro=/nix/store \
--bind-ro=/nix/var/nix/db \
--bind-ro=/nix/var/nix/daemon-socket \
''${credsBind} \
--bind="/nix/var/nix/profiles/per-container/${containerName}:/nix/var/nix/profiles" \
--bind="/nix/var/nix/gcroots/per-container/${containerName}:/nix/var/nix/gcroots" \
--setenv PATH="$PATH" \
--capability=CAP_SYS_TTY_CONFIG,CAP_NET_ADMIN,CAP_NET_RAW,CAP_SYS_ADMIN \
--ephemeral \
--network-namespace-path=/run/netns/${containerCfg.netns} \
${containerInit} "${containerCfg.config.system.build.toplevel}/init"
'';
};
in {
options = {
networking.namespaces = {
enable = mkEnableOption "netns@ service template";
containers = mkOption {
default = {};
type = types.attrsOf (types.submodule containerOpts);
};
};
};
config = {
assertions = [
{ assertion = cfg.containers != {} -> cfg.enable; message = "netns containers require netns@ service template"; }
];
systemd.services = {
"netns@" = mkIf cfg.enable {
description = "%I network namspace";
before = [ "network-pre.target" ];
wants = [ "network-pre.target" ];
path = with pkgs; [ iproute2 util-linux ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
PrivateNetwork = true;
ExecStart = "${pkgs.writers.writeDash "netns-up" ''
ip netns add "$1"
umount /var/run/netns/"$1"
mount --bind /proc/self/ns/net /var/run/netns/"$1"
''} %I";
ExecStop = "${pkgs.iproute2}/bin/ip netns del %I";
};
};
} // mapAttrs' mkContainerService cfg.containers;
};
}
|
