Kyle Isom
baf09e8b1f
- Add mcp flake input (git+ssh://git@git.wntrmute.dev/mc/mcp.git) - Add mcp CLI to mcpkg.nix system packages (installed on all machines) - Update mcp.nix to use Nix-managed mcp-agent binary path instead of hardcoded /usr/local/bin/mcp-agent Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
60 lines
1.8 KiB
Nix
60 lines
1.8 KiB
Nix
# MCP (Metacircular Control Plane) agent user and configuration.
|
|
#
|
|
# Creates a dedicated 'mcp' system user with rootless podman support
|
|
# and a systemd service for the agent daemon.
|
|
{ pkgs, inputs, ... }:
|
|
|
|
let
|
|
mcpUid = 995;
|
|
in
|
|
{
|
|
users.users.mcp = {
|
|
isSystemUser = true;
|
|
uid = mcpUid; # Pin UID so systemd Environment references stay stable.
|
|
group = "mcp";
|
|
home = "/srv/mcp";
|
|
shell = pkgs.shadow; # nologin equivalent
|
|
subUidRanges = [{ startUid = 100000; count = 65536; }];
|
|
subGidRanges = [{ startGid = 100000; count = 65536; }];
|
|
linger = true;
|
|
};
|
|
|
|
users.groups.mcp = {};
|
|
|
|
systemd.services.mcp-agent = {
|
|
description = "MCP Agent";
|
|
after = [ "network-online.target" ];
|
|
wants = [ "network-online.target" ];
|
|
wantedBy = [ "multi-user.target" ];
|
|
|
|
serviceConfig = {
|
|
Type = "simple";
|
|
ExecStart = "${inputs.mcp.packages.x86_64-linux.mcp-agent}/bin/mcp-agent server --config /srv/mcp/mcp-agent.toml";
|
|
Restart = "on-failure";
|
|
RestartSec = 5;
|
|
|
|
User = "mcp";
|
|
Group = "mcp";
|
|
Environment = [
|
|
"HOME=/srv/mcp"
|
|
"XDG_RUNTIME_DIR=/run/user/${toString mcpUid}"
|
|
"PATH=/run/current-system/sw/bin:/usr/local/bin"
|
|
];
|
|
|
|
NoNewPrivileges = true;
|
|
ProtectSystem = "full"; # "strict" blocks /run/user; "full" protects /usr and /boot
|
|
# ProtectHome makes /run/user inaccessible, which breaks rootless podman.
|
|
# The agent's home is /srv/mcp (not /home), so this is acceptable.
|
|
ProtectHome = false;
|
|
PrivateTmp = true;
|
|
PrivateDevices = true;
|
|
ProtectKernelTunables = true;
|
|
ProtectKernelModules = true;
|
|
RestrictSUIDSGID = true;
|
|
LockPersonality = true;
|
|
RestrictRealtime = true;
|
|
ReadWritePaths = [ "/srv" ];
|
|
};
|
|
};
|
|
}
|