Fix environment of spawned processes

std.ChildProcess isn't handling environment variables set at runtime properly,
so just use libc directly.

 src/c.zig        |  1 +
 src/command.zig  | 12 +++++++++---
 src/config.zig   |  2 +-
 src/keyboard.zig |  4 ++--
 src/server.zig   |  4 ++--
 5 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/src/c.zig b/src/c.zig
index 30d7340..30a91a6 100644
--- a/src/c.zig
+++ b/src/c.zig
@@ -2,6 +2,7 @@ pub usingnamespace @cImport({
     @cDefine("WLR_USE_UNSTABLE", {});
     @cInclude("time.h");
     @cInclude("stdlib.h");
+    @cInclude("unistd.h");
     @cInclude("wayland-server-core.h");
     //@cInclude("wlr/backend.h");
     //@cInclude("wlr/render/wlr_renderer.h");
diff --git a/src/command.zig b/src/command.zig
index 7aac7f6..6b4ec07 100644
--- a/src/command.zig
+++ b/src/command.zig
@@ -1,6 +1,7 @@
 const std = @import("std");
 const c = @import("c.zig");
 
+const Log = @import("log.zig").Log;
 const Server = @import("server.zig").Server;
 const ViewStack = @import("view_stack.zig").ViewStack;
 
@@ -8,6 +9,7 @@ pub const Arg = union {
     int: i32,
     uint: u32,
     float: f64,
+    cstr: [*:0]const u8,
     none: void,
 };
 
@@ -107,9 +109,13 @@ pub fn toggleFocusedViewTags(server: *Server, arg: Arg) void {
 /// Spawn a program.
 /// TODO: make this take a program as a paramter and spawn that
 pub fn spawn(server: *Server, arg: Arg) void {
-    const argv = [_][]const u8{ "/bin/sh", "-c", "alacritty" };
-    const child = std.ChildProcess.init(&argv, std.heap.c_allocator) catch unreachable;
-    std.ChildProcess.spawn(child) catch unreachable;
+    const cmd = arg.cstr;
+    if (c.fork() == 0) {
+        const terminator: ?*u8 = null;
+        if (c.execl("/bin/sh", "/bin/sh", "-c", cmd, terminator) == -1) {
+            Log.Error.log("Failed to execute command {}", .{cmd});
+        }
+    }
 }
 
 /// Close the focused view, if any.
diff --git a/src/config.zig b/src/config.zig
index 1434f07..4159203 100644
--- a/src/config.zig
+++ b/src/config.zig
@@ -50,7 +50,7 @@ pub const Config = struct {
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_h, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.modifyMasterCount, .arg = .{ .int = 1 } });
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_l, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.modifyMasterCount, .arg = .{ .int = -1 } });
 
-        try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_Return, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.spawn, .arg = .{ .none = {} } });
+        try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_Return, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.spawn, .arg = .{ .cstr = "alacritty" } });
 
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_1, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.setFocusedViewTags, .arg = .{ .uint = 1 << 0 } });
         try self.keybinds.append(Keybind{ .keysym = c.XKB_KEY_2, .modifiers = mod | c.WLR_MODIFIER_SHIFT, .command = command.setFocusedViewTags, .arg = .{ .uint = 1 << 1 } });
diff --git a/src/keyboard.zig b/src/keyboard.zig
index af2786f..83bc745 100644
--- a/src/keyboard.zig
+++ b/src/keyboard.zig
@@ -17,7 +17,7 @@ pub const Keyboard = struct {
     pub fn init(self: *Self, seat: *Seat, device: *c.wlr_input_device) !void {
         self.seat = seat;
         self.device = device;
-        self.wlr_keyboard = device.unnamed_133.keyboard;
+        self.wlr_keyboard = device.unnamed_136.keyboard;
 
         // We need to prepare an XKB keymap and assign it to the keyboard. This
         // assumes the defaults (e.g. layout = "us").
@@ -78,7 +78,7 @@ pub const Keyboard = struct {
             @alignCast(@alignOf(*c.wlr_event_keyboard_key), data),
         );
 
-        const wlr_keyboard: *c.wlr_keyboard = keyboard.device.unnamed_133.keyboard;
+        const wlr_keyboard: *c.wlr_keyboard = keyboard.device.unnamed_136.keyboard;
 
         // Translate libinput keycode -> xkbcommon
         const keycode = event.keycode + 8;
diff --git a/src/server.zig b/src/server.zig
index c729fd3..94d4ff7 100644
--- a/src/server.zig
+++ b/src/server.zig
@@ -4,6 +4,7 @@ const command = @import("command.zig");
 
 const Config = @import("config.zig").Config;
 const DecorationManager = @import("decoration_manager.zig").DecorationManager;
+const Log = @import("log.zig").Log;
 const Output = @import("output.zig").Output;
 const Root = @import("root.zig").Root;
 const Seat = @import("seat.zig").Seat;
@@ -105,8 +106,7 @@ pub const Server = struct {
             return error.CantStartBackend;
         }
 
-        // Set the WAYLAND_DISPLAY environment variable to our socket and run the
-        // startup command if requested. */
+        // Set the WAYLAND_DISPLAY environment variable to our socket
         if (c.setenv("WAYLAND_DISPLAY", socket, 1) == -1) {
             return error.CantSetEnv;
         }