Add ncurses UI support

Add helper routines to support ncurses UI programs.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

2 files changed, 601 insertions, 0 deletions

diff --git a/ui/ncurses/nc-cui.c b/ui/ncurses/nc-cui.c
new file mode 100644
index 0000000..2a4c971
--- /dev/null
+++ b/ui/ncurses/nc-cui.c
@@ -0,0 +1,513 @@
+/*
+ *  Copyright (C) 2009 Sony Computer Entertainment Inc.
+ *  Copyright 2009 Sony Corp.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#define _GNU_SOURCE
+
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "log/log.h"
+#include "talloc/talloc.h"
+#include "waiter/waiter.h"
+#include "ui/common/discover-client.h"
+#include "nc-cui.h"
+
+
+static struct cui_opt_data *cod_from_item(struct pmenu_item *item)
+{
+	return item->data;
+}
+
+/**
+ * cui_abort - Signal the main cui program loop to exit.
+ *
+ * Sets cui.abort, which causes the cui_run() routine to return.
+ */
+
+void cui_abort(struct cui *cui)
+{
+	pb_log("%s: exiting\n", __func__);
+	cui->abort = 1;
+}
+
+/**
+ * cui_resize - Signal the main cui program loop to resize
+ *
+ * Called at SIGWINCH.
+ */
+
+void cui_resize(struct cui *cui)
+{
+	pb_log("%s: resizing\n", __func__);
+	cui->resize = 1;
+}
+
+/**
+ * cui_on_exit - A generic main menu ESC callback.
+ */
+
+void cui_on_exit(struct pmenu *menu)
+{
+	cui_abort(cui_from_pmenu(menu));
+}
+
+/**
+ * cui_run_cmd - A generic cb to run the supplied command.
+ */
+
+int cui_run_cmd(struct pmenu_item *item)
+{
+	int result;
+	struct cui *cui = cui_from_item(item);
+	const char *const *cmd_argv = item->data;
+
+	nc_scr_status_printf(cui->current, "Running %s...", cmd_argv[0]);
+
+	def_prog_mode();
+
+	result = pb_run_cmd(cmd_argv);
+
+	reset_prog_mode();
+	redrawwin(cui->current->main_ncw);
+
+	if (result) {
+		pb_log("%s: failed: '%s'\n", __func__, cmd_argv[0]);
+		nc_scr_status_printf(cui->current, "Failed: %s", cmd_argv[0]);
+	}
+
+	return result;
+}
+
+/**
+ * cui_run_kexec - A generic cb to run kexec.
+ */
+
+static int cui_run_kexec(struct pmenu_item *item)
+{
+	int result;
+	struct cui *cui = cui_from_item(item);
+	struct cui_opt_data *cod = cod_from_item(item);
+
+	assert(cui->current == &cui->main->scr);
+	assert(cui->on_kexec);
+
+	pb_log("%s: %s\n", __func__, cod->dev->name, cod->opt->name);
+	nc_scr_status_printf(cui->current, "Booting %s...", cod->opt->name);
+
+	def_prog_mode();
+
+	result = cui->on_kexec(cui, cod);
+
+	reset_prog_mode();
+	redrawwin(cui->current->main_ncw);
+
+	if (!result) {
+		clear();
+		mvaddstr(1, 0, "system is going down now...");
+		refresh();
+		sleep(60);
+	}
+
+	pb_log("%s: failed: %s\n", __func__, cod->kd->image);
+	nc_scr_status_printf(cui->current, "Failed: kexec %s", cod->kd->image);
+
+	return 0;
+}
+
+/**
+ * cui_ked_on_exit - The ked on_exit callback.
+ */
+
+static void cui_ked_on_exit(struct ked *ked, enum ked_result ked_result,
+	struct pb_kexec_data *kd)
+{
+	struct cui *cui = cui_from_arg(ked->scr.ui_ctx);
+
+	if (ked_result == ked_update || ked_result == ked_boot) {
+		struct pmenu_item *i = pmenu_find_selected(cui->main);
+		struct cui_opt_data *cod = cod_from_item(i);
+
+		assert(kd);
+
+		talloc_steal(i, kd);
+		talloc_free(cod->kd);
+		cod->kd = kd;
+
+		pb_log("%s: updating opt '%s'\n", __func__, cod->opt->name);
+		pb_log(" image  '%s'\n", cod->kd->image);
+		pb_log(" initrd '%s'\n", cod->kd->initrd);
+		pb_log(" args   '%s'\n", cod->kd->args);
+	}
+
+	cui_set_current(cui, &cui->main->scr);
+
+	talloc_free(ked);
+
+	if (ked_result == ked_boot) {
+		struct pmenu_item *i = pmenu_find_selected(cui->main);
+		i->on_execute(i);
+	}
+}
+
+int cui_ked_run(struct pmenu_item *item)
+{
+	struct cui *cui = cui_from_item(item);
+	struct ked *ked;
+
+	ked = ked_init(cui, cod_from_item(item)->kd, cui_ked_on_exit);
+
+	cui_set_current(cui, &ked->scr);
+
+	return 0;
+}
+
+/**
+ * cui_set_current - Set the currently active screen and redraw it.
+ */
+
+struct nc_scr *cui_set_current(struct cui *cui, struct nc_scr *scr)
+{
+	struct nc_scr *old;
+
+	DBGS("%p -> %p\n", cui->current, scr);
+
+	assert(cui->current != scr);
+
+	old = cui->current;
+	old->unpost(old);
+
+	cui->current = scr;
+	cui->current->post(cui->current);
+
+	return old;
+}
+
+static int cui_process_key(void *arg)
+{
+	struct cui *cui = cui_from_arg(arg);
+
+	assert(cui->current);
+	cui->current->process_key(cui->current);
+	return 0;
+}
+
+static int cui_client_process_socket(void *arg)
+{
+	struct discover_client *client = arg;
+
+	discover_client_process(client);
+	return 0;
+}
+
+/**
+ * cui_handle_resize - Handle the term resize.
+ */
+
+static void cui_handle_resize(struct cui *cui)
+{
+	struct winsize ws;
+
+	if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
+		pb_log("%s: ioctl failed: %s\n", __func__, strerror(errno));
+		return;
+	}
+
+	pb_log("%s: {%u,%u}\n", __func__, ws.ws_row, ws.ws_col);
+
+	wclear(cui->current->main_ncw);
+	resize_term(ws.ws_row, ws.ws_col);
+	cui->current->resize(cui->current);
+
+	/* For some reason this makes ncurses redraw the screen */
+	getch();
+	redrawwin(cui->current->main_ncw);
+	wrefresh(cui->current->main_ncw);
+}
+
+/**
+ * cui_device_add - Client device_add callback.
+ *
+ * Creates menu_items for all the device boot_options and inserts those
+ * menu_items into the main menu.  Redraws the main menu if it is active.
+ */
+
+static int cui_device_add(struct device *dev, void *arg)
+{
+	struct cui *cui = cui_from_arg(arg);
+	int result;
+	struct boot_option *opt;
+	unsigned int o_count; /* device opts */
+	unsigned int insert_pt;
+	ITEM *selected;
+
+	pb_log("%s: %p %s\n", __func__, dev, dev->id);
+
+	selected = current_item(cui->main->ncm);
+
+	if (cui->current == &cui->main->scr)
+		cui->current->unpost(cui->current);
+
+	/* This disconnects items array from menu. */
+
+	result = set_menu_items(cui->main->ncm, NULL);
+
+	if (result)
+		pb_log("%s: set_menu_items failed: %d\n", __func__, result);
+
+	o_count = 0;
+	list_for_each_entry(&dev->boot_options, opt, list)
+		o_count++;
+
+	/* Insert new items at insert_pt. */
+
+	insert_pt = pmenu_grow(cui->main, o_count);
+
+	list_for_each_entry(&dev->boot_options, opt, list) {
+		struct pmenu_item *i;
+		struct cui_opt_data *cod;
+		char *name;
+		char *description;
+
+		/* Save the item in opt->ui_info for cui_device_remove() */
+
+		opt->ui_info = i = pmenu_item_alloc(cui->main);
+
+		name = talloc_asprintf(i, "%s: %s", opt->name,
+			opt->description);
+
+		description = talloc_asprintf(i,
+			" kexec: image='%s' initrd='%s' args='%s'",
+			opt->boot_image_file,
+			opt->initrd_file,
+			opt->boot_args);
+
+		pmenu_item_setup(cui->main, i, insert_pt, name, description);
+
+		i->on_edit = cui_ked_run;
+		i->on_execute = cui_run_kexec;
+		i->data = cod = talloc(i, struct cui_opt_data);
+
+		cod->dev = dev;
+		cod->opt = opt;
+		cod->opt_hash = pb_opt_hash(dev, opt);
+		cod->kd = talloc(i, struct pb_kexec_data);
+
+		cod->kd->image = talloc_strdup(cod->kd, opt->boot_image_file);
+		cod->kd->initrd = talloc_strdup(cod->kd, opt->initrd_file);
+		cod->kd->args = talloc_strdup(cod->kd, opt->boot_args);
+
+		insert_pt++;
+
+		/* If this is the default_item select it. */
+
+		if (cod->opt_hash == cui->default_item)
+			selected = i->nci;
+
+		pb_log("%s: adding opt '%s'\n", __func__, cod->opt->name);
+		pb_log("   image  '%s'\n", cod->kd->image);
+		pb_log("   initrd '%s'\n", cod->kd->initrd);
+		pb_log("   args   '%s'\n", cod->kd->args);
+	}
+
+	/* Re-attach the items array. */
+
+	result = set_menu_items(cui->main->ncm, cui->main->items);
+
+	if (result)
+		pb_log("%s: set_menu_items failed: %d\n", __func__, result);
+
+	if (0) {
+		pb_log("%s\n", __func__);
+		pmenu_dump_items(cui->main->items,
+			item_count(cui->main->ncm) + 1);
+	}
+
+	set_current_item(cui->main->ncm, selected);
+
+	if (cui->current == &cui->main->scr)
+		cui->current->post(cui->current);
+
+	return 0;
+}
+
+/**
+ * cui_device_remove - Client device remove callback.
+ *
+ * Removes all the menu_items for the device from the main menu and redraws the
+ * main menu if it is active.
+ */
+
+static void cui_device_remove(struct device *dev, void *arg)
+{
+	struct cui *cui = cui_from_arg(arg);
+	int result;
+	struct boot_option *opt;
+
+	pb_log("%s: %p %s\n", __func__, dev, dev->id);
+
+	if (cui->current == &cui->main->scr)
+		cui->current->unpost(cui->current);
+
+	/* This disconnects items array from menu. */
+
+	result = set_menu_items(cui->main->ncm, NULL);
+
+	if (result)
+		pb_log("%s: set_menu_items failed: %d\n", __func__, result);
+
+	list_for_each_entry(&dev->boot_options, opt, list) {
+		struct pmenu_item *i = pmenu_item_from_arg(opt->ui_info);
+
+		assert(pb_protocol_device_cmp(dev, cod_from_item(i)->dev));
+		pmenu_remove(cui->main, i);
+	}
+
+	/* Re-attach the items array. */
+
+	result = set_menu_items(cui->main->ncm, cui->main->items);
+
+	if (result)
+		pb_log("%s: set_menu_items failed: %d\n", __func__, result);
+
+	if (0) {
+		pb_log("%s\n", __func__);
+		pmenu_dump_items(cui->main->items,
+			item_count(cui->main->ncm) + 1);
+	}
+
+	if (cui->current == &cui->main->scr)
+		cui->current->post(cui->current);
+}
+
+/**
+ * cui_client_process_socket - Process a socket event from the discover server.
+ */
+
+static struct discover_client_ops cui_client_ops = {
+	.device_add = cui_device_add,
+	.device_remove = cui_device_remove,
+};
+
+/**
+ * cui_init - Setup the cui instance.
+ * @platform_info: A value for the struct cui platform_info member.
+ *
+ * Returns a pointer to a struct cui on success, or NULL on error.
+ *
+ * Allocates the cui instance, sets up the client and stdin waiters, and
+ * sets up the ncurses menu screen.
+ */
+
+struct cui *cui_init(void* platform_info,
+	int (*on_kexec)(struct cui *, struct cui_opt_data *))
+{
+	struct cui *cui;
+	struct discover_client *client;
+	unsigned int i;
+
+	cui = talloc_zero(NULL, struct cui);
+
+	if (!cui) {
+		pb_log("%s: alloc cui failed.\n", __func__);
+		fprintf(stderr, "%s: alloc cui failed.\n", __func__);
+		goto fail_alloc;
+	}
+
+	cui->c_sig = pb_cui_sig;
+	cui->platform_info = platform_info;
+	cui->on_kexec = on_kexec;
+
+	/* Loop here for scripts that just started the server. */
+
+	for (i = 10; i; i--) {
+		client = discover_client_init(&cui_client_ops, cui);
+		if (client)
+			break;
+		pb_log("%s: waiting for server %d\n", __func__, i);
+		sleep(1);
+	}
+
+	if (!client) {
+		pb_log("%s: discover_client_init failed.\n", __func__);
+		fprintf(stderr, "%s: error: discover_client_init failed.\n",
+			__func__);
+		fprintf(stderr, "check that pb-discover, "
+			"the petitboot daemon is running.\n");
+		goto fail_client_init;
+	}
+
+	atexit(nc_atexit);
+	nc_start();
+
+	waiter_register(discover_client_get_fd(client), WAIT_IN,
+		cui_client_process_socket, client);
+
+	waiter_register(STDIN_FILENO, WAIT_IN, cui_process_key, cui);
+
+	return cui;
+
+fail_client_init:
+	talloc_free(cui);
+fail_alloc:
+	return NULL;
+}
+
+/**
+ * cui_run - The main cui program loop.
+ * @cui: The cui instance.
+ * @main: The menu to use as the main menu.
+ *
+ * Runs the cui engine.  Does not return until indicated to do so by some
+ * user action, or an error occurs.  Frees the cui object on return.
+ * Returns 0 on success (return to shell), -1 on error (should restart).
+ */
+
+int cui_run(struct cui *cui, struct pmenu *main, unsigned int default_item)
+{
+	assert(main);
+
+	cui->main = main;
+	cui->current = &cui->main->scr;
+	cui->default_item = default_item;
+
+	cui->current->post(cui->current);
+
+	while (1) {
+		int result = waiter_poll();
+
+		if (result < 0 && errno != EINTR) {
+			pb_log("%s: poll: %s\n", __func__, strerror(errno));
+			break;
+		}
+
+		if (cui->abort)
+			break;
+
+		while (cui->resize) {
+			cui->resize = 0;
+			cui_handle_resize(cui);
+		}
+	}
+
+	nc_atexit();
+
+	return cui->abort ? 0 : -1;
+}
diff --git a/ui/ncurses/nc-cui.h b/ui/ncurses/nc-cui.h
new file mode 100644
index 0000000..668776e
--- /dev/null
+++ b/ui/ncurses/nc-cui.h
@@ -0,0 +1,88 @@
+/*
+ *  Copyright (C) 2009 Sony Computer Entertainment Inc.
+ *  Copyright 2009 Sony Corp.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#if !defined(_PB_NC_CUI_H)
+#define _PB_NC_CUI_H
+
+#include <signal.h>
+
+#include "nc-menu.h"
+#include "nc-ked.h"
+
+
+struct cui_opt_data {
+	const struct device *dev;
+	const struct boot_option *opt;
+	uint32_t opt_hash;
+	struct pb_kexec_data *kd;
+};
+
+/**
+ * struct cui - Data structure defining a cui state machine.
+ * @c_sig: Signature for callback type checking, should be cui_sig.
+ * @abort: When set to true signals the state machine to exit.
+ * @current: Pointer to the active nc object.
+ * @main: Pointer to the user supplied main menu.
+ *
+ * Device boot_options are dynamically added and removed from the @main
+ * menu.
+ */
+
+struct cui {
+	enum pb_nc_sig c_sig;
+	sig_atomic_t abort;
+	sig_atomic_t resize;
+	struct nc_scr *current;
+	struct pmenu *main;
+	void *platform_info;
+	unsigned int default_item;
+	int (*on_kexec)(struct cui *cui, struct cui_opt_data *cod);
+};
+
+struct cui *cui_init(void* platform_info,
+	int (*on_kexec)(struct cui *, struct cui_opt_data *));
+struct nc_scr *cui_set_current(struct cui *cui, struct nc_scr *scr);
+int cui_run(struct cui *cui, struct pmenu *main, unsigned int default_item);
+int cui_ked_run(struct pmenu_item *item);
+
+/* convenience routines */
+
+void cui_abort(struct cui *cui);
+void cui_resize(struct cui *cui);
+void cui_on_exit(struct pmenu *menu);
+int cui_run_cmd(struct pmenu_item *item);
+
+static inline struct cui *cui_from_arg(void *arg)
+{
+	struct cui *cui = (struct cui *)arg;
+
+	assert(cui->c_sig == pb_cui_sig);
+	return cui;
+}
+
+static inline struct cui *cui_from_pmenu(struct pmenu *menu)
+{
+	return cui_from_arg(menu->scr.ui_ctx);
+}
+
+static inline struct cui *cui_from_item(struct pmenu_item *item)
+{
+	return cui_from_pmenu(item->pmenu);
+}
+
+#endif