From 422ae44cf64849d043240e9b4e0aec60fc628dad Mon Sep 17 00:00:00 2001
From: Mike Crute <mike@crute.us>
Date: Sat, 8 Oct 2022 10:37:24 -0700
Subject: More notes on dbus

---
 .config/awesome/dbus_test.lua | 65 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/.config/awesome/dbus_test.lua b/.config/awesome/dbus_test.lua
index 4394029..50b9ff8 100644
--- a/.config/awesome/dbus_test.lua
+++ b/.config/awesome/dbus_test.lua
@@ -42,3 +42,68 @@ Gio.Async.call(function()
         "GetAll"
     )
 end)()
+
+
+
+-- https://docs.gtk.org/gio/index.html
+
+-- From https://stackoverflow.com/questions/43588324/how-to-call-dbus-methods-in-awesome-wm
+
+local lgi = require("lgi")
+local Gio = lgi.require("Gio")
+local GLib = lgi.require("GLib")
+
+-- Workaround for https://github.com/pavouk/lgi/issues/142
+local function bus_get_async(type)
+    Gio.bus_get(type, nil, coroutine.running())
+    local a, b = coroutine.yield()
+    return Gio.bus_get_finish(b)
+end
+
+local function inhibit(bus, what, who, why, mode)
+    local name = "org.freedesktop.login1"
+    local object = "/org/freedesktop/login1"
+    local interface = "org.freedesktop.login1.Manager"
+    local message = Gio.DBusMessage.new_method_call(name, object, interface, "Inhibit")
+    message:set_body(GLib.Variant("(ssss)",
+        { what, who, why, mode }))
+
+    local timeout = -1 -- Just use the default
+    local result, err = bus:async_send_message_with_reply(message, Gio.DBusSendMessageFlags.NONE,
+        timeout, nil)
+
+    if err then
+        print("error: " .. tostring(err))
+        return
+    end
+
+    if result:get_message_type() == "ERROR" then
+        local _, err = result:to_gerror()
+        print("error: " .. tostring(err))
+        return
+    end
+
+    local fd_list = result:get_unix_fd_list()
+    local fd, err = fd_list:get(0)
+    if err then
+        print("error: " .. tostring(err))
+        return
+    end
+
+    -- Now... somehow turn this fd into something we can close
+    return Gio.UnixInputStream.new(fd, true)
+end
+
+Gio.Async.call(function()
+    local bus = bus_get_async(Gio.BusType.SYSTEM)
+    local a = inhibit(bus, "shutdown:sleep", "hi, it's me!", "Just because", "delay")
+    print("got lock")
+    io.popen("sleep 10"):read("*a")
+    a:async_close()
+    -- Speed up deletion of the GDBusMessage that still references the FD
+    collectgarbage("collect")
+    collectgarbage("collect")
+
+    print("released lock")
+    io.popen("sleep 10"):read("*a")
+end)()
-- 
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