init: Add support for WorkingDirectory keys

apps/init.cpp

@@ -34,6 +34,7 @@ struct Service
     String standard_output;
     String standard_error;
     String standard_input;
+    String working_directory;
     Option<uid_t> user {};
     Option<gid_t> group {};
     bool wait { false };
@@ -85,6 +86,8 @@ static Result<void> service_child(const Service& service, SharedPtr<os::File> ou
     if (error) dup2(error->fd(), STDERR_FILENO);
     if (input) dup2(input->fd(), STDIN_FILENO);
 
+    if (!service.working_directory.is_empty()) chdir(service.working_directory.chars());
+
     if (service.user.has_value())
     {
         setgid(service.group.value());
@@ -240,6 +243,12 @@ static Result<void> load_service(const os::Path& path)
             continue;
         }
 
+        if (parts[0].view() == "WorkingDirectory")
+        {
+            service.working_directory = move(parts[1]);
+            continue;
+        }
+
         if (g_is_system && parts[0].view() == "User")
         {
             auto* pw = getpwnam(parts[1].chars());

base/etc/user/00-taskbar

@@ -1,4 +1,5 @@
 Name=taskbar
 Description=Start the taskbar.
 Command=/usr/bin/taskbar
+WorkingDirectory=/home/selene
 Restart=true

base/etc/user/01-terminal

@@ -1,3 +1,4 @@
 Name=terminal
 Description=Start the terminal.
+WorkingDirectory=/home/selene
 Command=/usr/bin/terminal