mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-18 19:51:17 +00:00
659 lines
21 KiB
Nix
659 lines
21 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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# The container's init script, a small wrapper around the regular
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# NixOS stage-2 init script.
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containerInit = (cfg:
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let
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renderExtraVeth = (name: cfg:
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''
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echo "Bringing ${name} up"
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ip link set dev ${name} up
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${optionalString (cfg.localAddress != null) ''
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echo "Setting ip for ${name}"
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ip addr add ${cfg.localAddress} dev ${name}
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''}
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${optionalString (cfg.localAddress6 != null) ''
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echo "Setting ip6 for ${name}"
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ip -6 addr add ${cfg.localAddress6} dev ${name}
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''}
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${optionalString (cfg.hostAddress != null) ''
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echo "Setting route to host for ${name}"
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ip route add ${cfg.hostAddress} dev ${name}
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''}
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${optionalString (cfg.hostAddress6 != null) ''
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echo "Setting route6 to host for ${name}"
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ip -6 route add ${cfg.hostAddress6} dev ${name}
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''}
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''
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);
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in
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pkgs.writeScript "container-init"
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''
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#! ${pkgs.stdenv.shell} -e
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# Initialise the container side of the veth pair.
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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ip link set host0 name eth0
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ip link set dev eth0 up
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if [ -n "$LOCAL_ADDRESS" ]; then
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ip addr add $LOCAL_ADDRESS dev eth0
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fi
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if [ -n "$LOCAL_ADDRESS6" ]; then
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ip -6 addr add $LOCAL_ADDRESS6 dev eth0
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fi
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if [ -n "$HOST_ADDRESS" ]; then
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ip route add $HOST_ADDRESS dev eth0
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ip route add default via $HOST_ADDRESS
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fi
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if [ -n "$HOST_ADDRESS6" ]; then
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ip -6 route add $HOST_ADDRESS6 dev eth0
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ip -6 route add default via $HOST_ADDRESS6
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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fi
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# Start the regular stage 1 script.
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exec "$1"
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''
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);
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nspawnExtraVethArgs = (name: cfg: "--network-veth-extra=${name}");
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startScript = cfg:
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''
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mkdir -p -m 0755 "$root/etc" "$root/var/lib"
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mkdir -p -m 0700 "$root/var/lib/private" "$root/root" /run/containers
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if ! [ -e "$root/etc/os-release" ]; then
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touch "$root/etc/os-release"
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fi
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if ! [ -e "$root/etc/machine-id" ]; then
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touch "$root/etc/machine-id"
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fi
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mkdir -p -m 0755 \
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"/nix/var/nix/profiles/per-container/$INSTANCE" \
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"/nix/var/nix/gcroots/per-container/$INSTANCE"
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cp --remove-destination /etc/resolv.conf "$root/etc/resolv.conf"
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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extraFlags+=" --network-veth"
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if [ -n "$HOST_BRIDGE" ]; then
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extraFlags+=" --network-bridge=$HOST_BRIDGE"
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fi
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fi
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extraFlags+=" ${concatStringsSep " " (mapAttrsToList nspawnExtraVethArgs cfg.extraVeths)}"
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for iface in $INTERFACES; do
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extraFlags+=" --network-interface=$iface"
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done
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for iface in $MACVLANS; do
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extraFlags+=" --network-macvlan=$iface"
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done
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# If the host is 64-bit and the container is 32-bit, add a
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# --personality flag.
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${optionalString (config.nixpkgs.system == "x86_64-linux") ''
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if [ "$(< ''${SYSTEM_PATH:-/nix/var/nix/profiles/per-container/$INSTANCE/system}/system)" = i686-linux ]; then
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extraFlags+=" --personality=x86"
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fi
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''}
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# Run systemd-nspawn without startup notification (we'll
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# wait for the container systemd to signal readiness).
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EXIT_ON_REBOOT=1 \
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exec ${config.systemd.package}/bin/systemd-nspawn \
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--keep-unit \
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-M "$INSTANCE" -D "$root" $extraFlags \
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$EXTRA_NSPAWN_FLAGS \
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--notify-ready=yes \
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--bind-ro=/nix/store \
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--bind-ro=/nix/var/nix/db \
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--bind-ro=/nix/var/nix/daemon-socket \
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--bind="/nix/var/nix/profiles/per-container/$INSTANCE:/nix/var/nix/profiles" \
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--bind="/nix/var/nix/gcroots/per-container/$INSTANCE:/nix/var/nix/gcroots" \
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--setenv PRIVATE_NETWORK="$PRIVATE_NETWORK" \
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--setenv HOST_BRIDGE="$HOST_BRIDGE" \
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--setenv HOST_ADDRESS="$HOST_ADDRESS" \
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--setenv LOCAL_ADDRESS="$LOCAL_ADDRESS" \
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--setenv HOST_ADDRESS6="$HOST_ADDRESS6" \
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--setenv LOCAL_ADDRESS6="$LOCAL_ADDRESS6" \
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--setenv PATH="$PATH" \
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${if cfg.additionalCapabilities != null then
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''--capability="${concatStringsSep " " cfg.additionalCapabilities}"'' else ""
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} \
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${containerInit cfg} "''${SYSTEM_PATH:-/nix/var/nix/profiles/system}/init"
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'';
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preStartScript = cfg:
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''
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# Clean up existing machined registration and interfaces.
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machinectl terminate "$INSTANCE" 2> /dev/null || true
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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ip link del dev "ve-$INSTANCE" 2> /dev/null || true
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ip link del dev "vb-$INSTANCE" 2> /dev/null || true
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fi
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${concatStringsSep "\n" (
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mapAttrsToList (name: cfg:
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''ip link del dev ${name} 2> /dev/null || true ''
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) cfg.extraVeths
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)}
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'';
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postStartScript = (cfg:
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let
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ipcall = cfg: ipcmd: variable: attribute:
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if cfg.${attribute} == null then
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''
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if [ -n "${variable}" ]; then
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${ipcmd} add ${variable} dev $ifaceHost
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fi
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''
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else
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''${ipcmd} add ${cfg.${attribute}} dev $ifaceHost'';
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renderExtraVeth = name: cfg:
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if cfg.hostBridge != null then
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''
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# Add ${name} to bridge ${cfg.hostBridge}
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ip link set dev ${name} master ${cfg.hostBridge} up
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''
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else
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''
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# Set IPs and routes for ${name}
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${optionalString (cfg.hostAddress != null) ''
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ip addr add ${cfg.hostAddress} dev ${name}
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''}
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${optionalString (cfg.hostAddress6 != null) ''
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ip -6 addr add ${cfg.hostAddress6} dev ${name}
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''}
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${optionalString (cfg.localAddress != null) ''
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ip route add ${cfg.localAddress} dev ${name}
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''}
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${optionalString (cfg.localAddress6 != null) ''
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ip -6 route add ${cfg.localAddress6} dev ${name}
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''}
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'';
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in
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''
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if [ "$PRIVATE_NETWORK" = 1 ]; then
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if [ -z "$HOST_BRIDGE" ]; then
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ifaceHost=ve-$INSTANCE
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ip link set dev $ifaceHost up
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${ipcall cfg "ip addr" "$HOST_ADDRESS" "hostAddress"}
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${ipcall cfg "ip -6 addr" "$HOST_ADDRESS6" "hostAddress6"}
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${ipcall cfg "ip route" "$LOCAL_ADDRESS" "localAddress"}
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${ipcall cfg "ip -6 route" "$LOCAL_ADDRESS6" "localAddress6"}
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fi
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${concatStringsSep "\n" (mapAttrsToList renderExtraVeth cfg.extraVeths)}
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fi
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# Get the leader PID so that we can signal it in
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# preStop. We can't use machinectl there because D-Bus
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# might be shutting down. FIXME: in systemd 219 we can
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# just signal systemd-nspawn to do a clean shutdown.
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machinectl show "$INSTANCE" | sed 's/Leader=\(.*\)/\1/;t;d' > "/run/containers/$INSTANCE.pid"
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''
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);
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serviceDirectives = cfg: {
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ExecReload = pkgs.writeScript "reload-container"
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''
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#! ${pkgs.stdenv.shell} -e
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${pkgs.nixos-container}/bin/nixos-container run "$INSTANCE" -- \
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bash --login -c "''${SYSTEM_PATH:-/nix/var/nix/profiles/system}/bin/switch-to-configuration test"
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'';
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SyslogIdentifier = "container %i";
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EnvironmentFile = "-/etc/containers/%i.conf";
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Type = "notify";
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# Note that on reboot, systemd-nspawn returns 133, so this
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# unit will be restarted. On poweroff, it returns 0, so the
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# unit won't be restarted.
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RestartForceExitStatus = "133";
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SuccessExitStatus = "133";
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Restart = "on-failure";
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# Hack: we don't want to kill systemd-nspawn, since we call
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# "machinectl poweroff" in preStop to shut down the
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# container cleanly. But systemd requires sending a signal
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# (at least if we want remaining processes to be killed
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# after the timeout). So send an ignored signal.
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KillMode = "mixed";
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KillSignal = "WINCH";
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DevicePolicy = "closed";
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DeviceAllow = map (d: "${d.node} ${d.modifier}") cfg.allowedDevices;
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};
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system = config.nixpkgs.system;
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bindMountOpts = { name, config, ... }: {
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options = {
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mountPoint = mkOption {
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example = "/mnt/usb";
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type = types.str;
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description = "Mount point on the container file system.";
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};
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hostPath = mkOption {
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default = null;
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example = "/home/alice";
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type = types.nullOr types.str;
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description = "Location of the host path to be mounted.";
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};
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isReadOnly = mkOption {
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default = true;
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example = true;
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type = types.bool;
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description = "Determine whether the mounted path will be accessed in read-only mode.";
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};
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};
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config = {
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mountPoint = mkDefault name;
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};
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};
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allowedDeviceOpts = { name, config, ... }: {
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options = {
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node = mkOption {
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example = "/dev/net/tun";
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type = types.str;
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description = "Path to device node";
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};
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modifier = mkOption {
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example = "rw";
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type = types.str;
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description = ''
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Device node access modifier. Takes a combination
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<literal>r</literal> (read), <literal>w</literal> (write), and
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<literal>m</literal> (mknod). See the
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<literal>systemd.resource-control(5)</literal> man page for more
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information.'';
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};
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};
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};
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mkBindFlag = d:
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let flagPrefix = if d.isReadOnly then " --bind-ro=" else " --bind=";
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mountstr = if d.hostPath != null then "${d.hostPath}:${d.mountPoint}" else "${d.mountPoint}";
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in flagPrefix + mountstr ;
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mkBindFlags = bs: concatMapStrings mkBindFlag (lib.attrValues bs);
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networkOptions = {
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hostBridge = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "br0";
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description = ''
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Put the host-side of the veth-pair into the named bridge.
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Only one of hostAddress* or hostBridge can be given.
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'';
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};
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hostAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.231.136.1";
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description = ''
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The IPv4 address assigned to the host interface.
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(Not used when hostBridge is set.)
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'';
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};
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hostAddress6 = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "fc00::1";
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description = ''
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The IPv6 address assigned to the host interface.
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(Not used when hostBridge is set.)
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'';
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};
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localAddress = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "10.231.136.2";
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description = ''
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The IPv4 address assigned to the interface in the container.
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If a hostBridge is used, this should be given with netmask to access
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the whole network. Otherwise the default netmask is /32 and routing is
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set up from localAddress to hostAddress and back.
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'';
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};
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localAddress6 = mkOption {
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type = types.nullOr types.string;
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default = null;
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example = "fc00::2";
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description = ''
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The IPv6 address assigned to the interface in the container.
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If a hostBridge is used, this should be given with netmask to access
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the whole network. Otherwise the default netmask is /128 and routing is
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set up from localAddress6 to hostAddress6 and back.
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'';
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};
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};
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dummyConfig =
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{
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extraVeths = {};
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additionalCapabilities = [];
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allowedDevices = [];
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hostAddress = null;
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hostAddress6 = null;
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localAddress = null;
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localAddress6 = null;
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};
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in
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{
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options = {
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boot.isContainer = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether this NixOS machine is a lightweight container running
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in another NixOS system.
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'';
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};
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boot.enableContainers = mkOption {
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type = types.bool;
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default = !config.boot.isContainer;
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description = ''
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Whether to enable support for nixos containers.
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'';
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};
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containers = mkOption {
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type = types.attrsOf (types.submodule (
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{ config, options, name, ... }:
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{
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options = {
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config = mkOption {
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description = ''
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A specification of the desired configuration of this
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container, as a NixOS module.
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'';
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type = lib.mkOptionType {
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name = "Toplevel NixOS config";
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merge = loc: defs: (import ../../lib/eval-config.nix {
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inherit system;
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modules =
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let extraConfig =
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{ boot.isContainer = true;
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networking.hostName = mkDefault name;
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networking.useDHCP = false;
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};
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in [ extraConfig ] ++ (map (x: x.value) defs);
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prefix = [ "containers" name ];
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}).config;
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};
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};
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path = mkOption {
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type = types.path;
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example = "/nix/var/nix/profiles/containers/webserver";
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description = ''
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As an alternative to specifying
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<option>config</option>, you can specify the path to
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the evaluated NixOS system configuration, typically a
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symlink to a system profile.
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'';
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};
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additionalCapabilities = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "CAP_NET_ADMIN" "CAP_MKNOD" ];
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description = ''
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Grant additional capabilities to the container. See the
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capabilities(7) and systemd-nspawn(1) man pages for more
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information.
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'';
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};
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enableTun = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Allows the container to create and setup tunnel interfaces
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by granting the <literal>NET_ADMIN</literal> capability and
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enabling access to <literal>/dev/net/tun</literal>.
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'';
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};
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privateNetwork = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to give the container its own private virtual
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Ethernet interface. The interface is called
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<literal>eth0</literal>, and is hooked up to the interface
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<literal>ve-<replaceable>container-name</replaceable></literal>
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on the host. If this option is not set, then the
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container shares the network interfaces of the host,
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and can bind to any port on any interface.
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'';
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};
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interfaces = mkOption {
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type = types.listOf types.string;
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default = [];
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example = [ "eth1" "eth2" ];
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description = ''
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The list of interfaces to be moved into the container.
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'';
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};
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extraVeths = mkOption {
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type = with types; attrsOf (submodule { options = networkOptions; });
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default = {};
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description = ''
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Extra veth-pairs to be created for the container
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'';
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};
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autoStart = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Wether the container is automatically started at boot-time.
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'';
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};
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bindMounts = mkOption {
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type = with types; loaOf (submodule bindMountOpts);
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default = {};
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example = { "/home" = { hostPath = "/home/alice";
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isReadOnly = false; };
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};
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description =
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''
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An extra list of directories that is bound to the container.
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'';
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};
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allowedDevices = mkOption {
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type = with types; listOf (submodule allowedDeviceOpts);
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default = [];
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example = [ { node = "/dev/net/tun"; modifier = "rw"; } ];
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description = ''
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A list of device nodes to which the containers has access to.
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'';
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};
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} // networkOptions;
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config = mkMerge
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[
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(mkIf options.config.isDefined {
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path = config.config.system.build.toplevel;
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})
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];
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}));
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default = {};
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example = literalExample
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''
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{ webserver =
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{ path = "/nix/var/nix/profiles/webserver";
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};
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database =
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{ config =
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{ config, pkgs, ... }:
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{ services.postgresql.enable = true;
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services.postgresql.package = pkgs.postgresql92;
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};
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};
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}
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'';
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description = ''
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A set of NixOS system configurations to be run as lightweight
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containers. Each container appears as a service
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<literal>container-<replaceable>name</replaceable></literal>
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on the host system, allowing it to be started and stopped via
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|
<command>systemctl</command>.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
|
|
config = mkIf (config.boot.enableContainers) (let
|
|
|
|
unit = {
|
|
description = "Container '%i'";
|
|
|
|
unitConfig.RequiresMountsFor = [ "/var/lib/containers/%i" ];
|
|
|
|
path = [ pkgs.iproute ];
|
|
|
|
environment.INSTANCE = "%i";
|
|
environment.root = "/var/lib/containers/%i";
|
|
|
|
preStart = preStartScript dummyConfig;
|
|
|
|
script = startScript dummyConfig;
|
|
|
|
postStart = postStartScript dummyConfig;
|
|
|
|
preStop =
|
|
''
|
|
pid="$(cat /run/containers/$INSTANCE.pid)"
|
|
if [ -n "$pid" ]; then
|
|
kill -RTMIN+4 "$pid"
|
|
fi
|
|
rm -f "/run/containers/$INSTANCE.pid"
|
|
'';
|
|
|
|
restartIfChanged = false;
|
|
|
|
serviceConfig = serviceDirectives dummyConfig;
|
|
};
|
|
in {
|
|
systemd.services = listToAttrs (filter (x: x.value != null) (
|
|
# The generic container template used by imperative containers
|
|
[{ name = "container@"; value = unit; }]
|
|
# declarative containers
|
|
++ (mapAttrsToList (name: cfg: nameValuePair "container@${name}" (let
|
|
config = cfg // (
|
|
if cfg.enableTun then
|
|
{
|
|
allowedDevices = cfg.allowedDevices
|
|
++ [ { node = "/dev/net/tun"; modifier = "rw"; } ];
|
|
additionalCapabilities = cfg.additionalCapabilities
|
|
++ [ "CAP_NET_ADMIN" ];
|
|
}
|
|
else {});
|
|
in
|
|
unit // {
|
|
preStart = preStartScript config;
|
|
script = startScript config;
|
|
postStart = postStartScript config;
|
|
serviceConfig = serviceDirectives config;
|
|
} // (
|
|
if config.autoStart then
|
|
{
|
|
wantedBy = [ "multi-user.target" ];
|
|
wants = [ "network.target" ];
|
|
after = [ "network.target" ];
|
|
restartTriggers = [ config.path ];
|
|
reloadIfChanged = true;
|
|
}
|
|
else {})
|
|
)) config.containers)
|
|
));
|
|
|
|
# Generate a configuration file in /etc/containers for each
|
|
# container so that container@.target can get the container
|
|
# configuration.
|
|
environment.etc = mapAttrs' (name: cfg: nameValuePair "containers/${name}.conf"
|
|
{ text =
|
|
''
|
|
SYSTEM_PATH=${cfg.path}
|
|
${optionalString cfg.privateNetwork ''
|
|
PRIVATE_NETWORK=1
|
|
${optionalString (cfg.hostBridge != null) ''
|
|
HOST_BRIDGE=${cfg.hostBridge}
|
|
''}
|
|
${optionalString (cfg.hostAddress != null) ''
|
|
HOST_ADDRESS=${cfg.hostAddress}
|
|
''}
|
|
${optionalString (cfg.hostAddress6 != null) ''
|
|
HOST_ADDRESS6=${cfg.hostAddress6}
|
|
''}
|
|
${optionalString (cfg.localAddress != null) ''
|
|
LOCAL_ADDRESS=${cfg.localAddress}
|
|
''}
|
|
${optionalString (cfg.localAddress6 != null) ''
|
|
LOCAL_ADDRESS6=${cfg.localAddress6}
|
|
''}
|
|
''}
|
|
INTERFACES="${toString cfg.interfaces}"
|
|
${optionalString cfg.autoStart ''
|
|
AUTO_START=1
|
|
''}
|
|
EXTRA_NSPAWN_FLAGS="${mkBindFlags cfg.bindMounts}"
|
|
'';
|
|
}) config.containers;
|
|
|
|
# Generate /etc/hosts entries for the containers.
|
|
networking.extraHosts = concatStrings (mapAttrsToList (name: cfg: optionalString (cfg.localAddress != null)
|
|
''
|
|
${cfg.localAddress} ${name}.containers
|
|
'') config.containers);
|
|
|
|
networking.dhcpcd.denyInterfaces = [ "ve-*" ];
|
|
|
|
environment.systemPackages = [ pkgs.nixos-container ];
|
|
});
|
|
}
|