console: add user console daemon

This adds a first draft of systemd-consoled. This is still missing a lot
of features and does some rather primitive rendering. However, it shows
the direction this code is going and serves as basis for further testing.

The systemd-consoled binary should be run as `systemd --user' unit. It
automatically picks up any session marked as Desktop=SYSTEMD-CONSOLE.
Therefore, you can use any login-manager you want (ranging from /bin/login
to gdm) to create sessions for systemd-consoled. However, the sessions
managers must be prepared to set the Desktop= variable properly.

The user-session is called `systemd-console', only the daemon providing
the terminal environment is called `systemd-consoled' (mind the 'd').

So far, only a single terminal session is provided on each opened
user-session. However, we support multiple user-sessions (even across
multiple seats) just fine. In the future, the workspace logic will get
extended so you can have multiple terminal sessions in a single
user-session for easier access.

Note that this is still experimental! Instructions on how to run it will
follow shortly.

1 files changed, 170 insertions, 0 deletions

diff --git a/src/console/consoled.h b/src/console/consoled.h
new file mode 100644
index 0000000000..f8a3df4487
--- /dev/null
+++ b/src/console/consoled.h
@@ -0,0 +1,170 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <inttypes.h>
+#include <libudev.h>
+#include <stdlib.h>
+#include "grdev.h"
+#include "hashmap.h"
+#include "idev.h"
+#include "list.h"
+#include "macro.h"
+#include "pty.h"
+#include "sd-bus.h"
+#include "sd-event.h"
+#include "sysview.h"
+#include "term.h"
+#include "unifont.h"
+#include "util.h"
+
+typedef struct Manager Manager;
+typedef struct Session Session;
+typedef struct Display Display;
+typedef struct Workspace Workspace;
+typedef struct Terminal Terminal;
+
+/*
+ * Terminals
+ */
+
+struct Terminal {
+        Workspace *workspace;
+        LIST_FIELDS(Terminal, terminals_by_workspace);
+
+        term_utf8 utf8;
+        term_parser *parser;
+        term_screen *screen;
+        Pty *pty;
+};
+
+int terminal_new(Terminal **out, Workspace *w);
+Terminal *terminal_free(Terminal *t);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Terminal*, terminal_free);
+
+void terminal_resize(Terminal *t);
+void terminal_run(Terminal *t);
+void terminal_feed(Terminal *t, idev_data *data);
+bool terminal_draw(Terminal *t, const grdev_display_target *target);
+
+/*
+ * Workspaces
+ */
+
+struct Workspace {
+        unsigned long ref;
+        Manager *manager;
+        LIST_FIELDS(Workspace, workspaces_by_manager);
+
+        LIST_HEAD(Terminal, terminal_list);
+        Terminal *current;
+
+        LIST_HEAD(Session, session_list);
+        uint32_t width;
+        uint32_t height;
+};
+
+int workspace_new(Workspace **out, Manager *m);
+Workspace *workspace_ref(Workspace *w);
+Workspace *workspace_unref(Workspace *w);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Workspace*, workspace_unref);
+
+Workspace *workspace_attach(Workspace *w, Session *s);
+Workspace *workspace_detach(Workspace *w, Session *s);
+void workspace_refresh(Workspace *w);
+
+void workspace_dirty(Workspace *w);
+void workspace_feed(Workspace *w, idev_data *data);
+bool workspace_draw(Workspace *w, const grdev_display_target *target);
+
+/*
+ * Displays
+ */
+
+struct Display {
+        Session *session;
+        LIST_FIELDS(Display, displays_by_session);
+        grdev_display *grdev;
+        uint32_t width;
+        uint32_t height;
+};
+
+int display_new(Display **out, Session *s, grdev_display *grdev);
+Display *display_free(Display *d);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Display*, display_free);
+
+void display_refresh(Display *d);
+void display_render(Display *d, Workspace *w);
+
+/*
+ * Sessions
+ */
+
+struct Session {
+        Manager *manager;
+        sysview_session *sysview;
+        grdev_session *grdev;
+        idev_session *idev;
+
+        LIST_FIELDS(Session, sessions_by_workspace);
+        Workspace *my_ws;
+        Workspace *active_ws;
+
+        LIST_HEAD(Display, display_list);
+        sd_event_source *redraw_src;
+};
+
+int session_new(Session **out, Manager *m, sysview_session *session);
+Session *session_free(Session *s);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Session*, session_free);
+
+void session_dirty(Session *s);
+
+void session_add_device(Session *s, sysview_device *device);
+void session_remove_device(Session *s, sysview_device *device);
+void session_refresh_device(Session *s, sysview_device *device, struct udev_device *ud);
+
+/*
+ * Managers
+ */
+
+struct Manager {
+        sd_event *event;
+        sd_bus *sysbus;
+        unifont *uf;
+        sysview_context *sysview;
+        grdev_context *grdev;
+        idev_context *idev;
+        LIST_HEAD(Workspace, workspace_list);
+};
+
+int manager_new(Manager **out);
+Manager *manager_free(Manager *m);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
+
+int manager_run(Manager *m);