systemd · JSON Structure

Systemd Structure

Cross-interface structural document describing the relationship between systemd's D-Bus and Varlink surfaces, their bus names/socket paths, and the resource families they expose.

Type: object Properties: 1

BootCgroupsContainerD-BusInitIPCJournalLinuxLoggingNetworkOpen SourcePID 1Service ManagerSystemSystemdVarlink

Systemd Structure is a JSON Structure definition published by systemd, describing 1 property. It conforms to the https://json-schema.org/draft/2020-12/schema meta-schema.

Properties

interfaces

Meta-schema: https://json-schema.org/draft/2020-12/schema

JSON Structure

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/systemd/refs/heads/main/json-structure/systemd-structure.json",
  "title": "systemd Interface Structure",
  "description": "Cross-interface structural document describing the relationship between systemd's D-Bus and Varlink surfaces, their bus names/socket paths, and the resource families they expose.",
  "type": "object",
  "properties": {
    "interfaces": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["interface", "transport", "bus_name_or_socket", "resources"],
        "properties": {
          "interface": { "type": "string" },
          "transport": { "type": "string", "enum": ["dbus", "varlink"] },
          "bus_name_or_socket": { "type": "string" },
          "object_path": { "type": "string" },
          "daemon": { "type": "string" },
          "resources": { "type": "array", "items": { "type": "string" } }
        }
      }
    }
  },
  "examples": [
    {
      "interfaces": [
        {
          "interface": "org.freedesktop.systemd1",
          "transport": "dbus",
          "bus_name_or_socket": "org.freedesktop.systemd1",
          "object_path": "/org/freedesktop/systemd1",
          "daemon": "systemd (PID 1)",
          "resources": ["units", "jobs", "manager"]
        },
        {
          "interface": "org.freedesktop.login1",
          "transport": "dbus",
          "bus_name_or_socket": "org.freedesktop.login1",
          "object_path": "/org/freedesktop/login1",
          "daemon": "systemd-logind",
          "resources": ["sessions", "users", "seats", "inhibitors", "power"]
        },
        {
          "interface": "org.freedesktop.network1",
          "transport": "dbus",
          "bus_name_or_socket": "org.freedesktop.network1",
          "object_path": "/org/freedesktop/network1",
          "daemon": "systemd-networkd",
          "resources": ["links", "manager"]
        },
        {
          "interface": "org.freedesktop.resolve1",
          "transport": "dbus",
          "bus_name_or_socket": "org.freedesktop.resolve1",
          "object_path": "/org/freedesktop/resolve1",
          "daemon": "systemd-resolved",
          "resources": ["resolve", "cache", "configuration"]
        },
        {
          "interface": "org.freedesktop.machine1",
          "transport": "dbus",
          "bus_name_or_socket": "org.freedesktop.machine1",
          "object_path": "/org/freedesktop/machine1",
          "daemon": "systemd-machined",
          "resources": ["machines", "images"]
        },
        {
          "interface": "io.systemd.UserDatabase",
          "transport": "varlink",
          "bus_name_or_socket": "/run/systemd/userdb/io.systemd.UserDatabase",
          "daemon": "nss-systemd / systemd-userdbd",
          "resources": ["identity"]
        },
        {
          "interface": "io.systemd.Credentials",
          "transport": "varlink",
          "bus_name_or_socket": "/run/systemd/io.systemd.Credentials",
          "daemon": "systemd-creds / PID 1",
          "resources": ["credentials"]
        }
      ]
    }
  ]
}