Revamp hidden timeout handling
Add a new timeout_style environment variable and a corresponding GRUB_TIMEOUT_STYLE configuration key for grub-mkconfig. This controls hidden-timeout handling more simply than the previous arrangements, and pressing any hotkeys associated with menu entries during the hidden timeout will now boot the corresponding menu entry immediately. GRUB_HIDDEN_TIMEOUT=<non-empty> + GRUB_TIMEOUT=<non-zero> now generates a warning, and if it shows the menu it will do so as if the second timeout were not present. Other combinations are translated into reasonable equivalents.
This commit is contained in:
Colin Watson
parent
2d76b4d81e
commit
8f236c1419
6 changed files with 255 additions and 37 deletions
14
ChangeLog
14
ChangeLog
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@ -1,3 +1,17 @@
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2013-11-28 Colin Watson <cjwatson@ubuntu.com>
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Add a new timeout_style environment variable and a corresponding
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GRUB_TIMEOUT_STYLE configuration key for grub-mkconfig. This
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controls hidden-timeout handling more simply than the previous
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arrangements, and pressing any hotkeys associated with menu entries
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during the hidden timeout will now boot the corresponding menu entry
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immediately.
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GRUB_HIDDEN_TIMEOUT=<non-empty> + GRUB_TIMEOUT=<non-zero> now
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generates a warning, and if it shows the menu it will do so as if
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the second timeout were not present. Other combinations are
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translated into reasonable equivalents.
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2013-11-27 Vladimir Serbinenko <phcoder@gmail.com>
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Eliminate variable length arrays in grub_vsnprintf_real.
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@ -1298,19 +1298,46 @@ a key is pressed. The default is @samp{5}. Set to @samp{0} to boot
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immediately without displaying the menu, or to @samp{-1} to wait
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indefinitely.
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If @samp{GRUB_TIMEOUT_STYLE} is set to @samp{countdown} or @samp{hidden},
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the timeout is instead counted before the menu is displayed.
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@item GRUB_TIMEOUT_STYLE
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If this option is unset or set to @samp{menu}, then GRUB will display the
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menu and then wait for the timeout set by @samp{GRUB_TIMEOUT} to expire
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before booting the default entry. Pressing a key interrupts the timeout.
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If this option is set to @samp{countdown} or @samp{hidden}, then, before
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displaying the menu, GRUB will wait for the timeout set by
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@samp{GRUB_TIMEOUT} to expire. If @key{ESC} is pressed during that time, it
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will display the menu and wait for input according to @samp{GRUB_TIMEOUT}.
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If a hotkey associated with a menu entry is pressed, it will boot the
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associated menu entry immediately. If the timeout expires before either of
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these happens, it will display the menu. In the @samp{countdown} case, it
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will show a one-line indication of the remaining time.
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@item GRUB_HIDDEN_TIMEOUT
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Wait this many seconds for @key{ESC} to be pressed before displaying the menu.
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If no @key{ESC} is pressed during that time, display the menu for the number of
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seconds specified in GRUB_TIMEOUT before booting the default entry. We expect
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that most people who use GRUB_HIDDEN_TIMEOUT will want to have GRUB_TIMEOUT set
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to @samp{0} so that the menu is not displayed at all unless @key{ESC} is
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pressed.
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Unset by default.
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Wait this many seconds before displaying the menu. If @key{ESC} is pressed
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during that time, display the menu and wait for input according to
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@samp{GRUB_TIMEOUT}. If a hotkey associated with a menu entry is pressed,
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boot the associated menu entry immediately. If the timeout expires before
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either of these happens, display the menu for the number of seconds
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specified in @samp{GRUB_TIMEOUT} before booting the default entry.
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If you set @samp{GRUB_HIDDEN_TIMEOUT}, you should also set
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@samp{GRUB_TIMEOUT=0} so that the menu is not displayed at all unless
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@key{ESC} is pressed.
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This option is unset by default, and is deprecated in favour of the less
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confusing @samp{GRUB_TIMEOUT_STYLE=countdown} or
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@samp{GRUB_TIMEOUT_STYLE=hidden}.
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@item GRUB_HIDDEN_TIMEOUT_QUIET
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In conjunction with @samp{GRUB_HIDDEN_TIMEOUT}, set this to @samp{true} to
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suppress the verbose countdown while waiting for a key to be pressed before
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displaying the menu. Unset by default.
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displaying the menu.
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This option is unset by default, and is deprecated in favour of the less
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confusing @samp{GRUB_TIMEOUT_STYLE=countdown}.
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@item GRUB_DEFAULT_BUTTON
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@itemx GRUB_TIMEOUT_BUTTON
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@ -3030,6 +3057,7 @@ These variables have special meaning to GRUB.
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* superusers::
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* theme::
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* timeout::
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* timeout_style::
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@end menu
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@ -3462,10 +3490,23 @@ keyboard input before booting the default menu entry. A timeout of @samp{0}
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means to boot the default entry immediately without displaying the menu; a
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timeout of @samp{-1} (or unset) means to wait indefinitely.
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If @samp{timeout_style} (@pxref{timeout_style}) is set to @samp{countdown}
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or @samp{hidden}, the timeout is instead counted before the menu is
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displayed.
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This variable is often set by @samp{GRUB_TIMEOUT} or
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@samp{GRUB_HIDDEN_TIMEOUT} (@pxref{Simple configuration}).
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@node timeout_style
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@subsection timeout_style
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This variable may be set to @samp{menu}, @samp{countdown}, or @samp{hidden}
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to control the way in which the timeout (@pxref{timeout}) interacts with
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displaying the menu. See the documentation of @samp{GRUB_TIMEOUT_STYLE}
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(@pxref{Simple configuration}) for details.
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@node Environment block
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@section The GRUB environment block
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@ -523,7 +523,7 @@ static const char *features[] = {
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"feature_chainloader_bpb", "feature_ntldr", "feature_platform_search_hint",
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"feature_default_font_path", "feature_all_video_module",
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"feature_menuentry_id", "feature_menuentry_options", "feature_200_final",
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"feature_nativedisk_cmd"
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"feature_nativedisk_cmd", "feature_timeout_style"
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};
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GRUB_MOD_INIT(normal)
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@ -40,6 +40,22 @@
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grub_err_t (*grub_gfxmenu_try_hook) (int entry, grub_menu_t menu,
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int nested) = NULL;
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enum timeout_style {
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TIMEOUT_STYLE_MENU,
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TIMEOUT_STYLE_COUNTDOWN,
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TIMEOUT_STYLE_HIDDEN
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};
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struct timeout_style_name {
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const char *name;
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enum timeout_style style;
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} timeout_style_names[] = {
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{"menu", TIMEOUT_STYLE_MENU},
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{"countdown", TIMEOUT_STYLE_COUNTDOWN},
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{"hidden", TIMEOUT_STYLE_HIDDEN},
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{NULL, 0}
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};
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/* Wait until the user pushes any key so that the user
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can see what happened. */
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void
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@ -70,6 +86,38 @@ grub_menu_get_entry (grub_menu_t menu, int no)
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return e;
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}
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/* Get the index of a menu entry associated with a given hotkey, or -1. */
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static int
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get_entry_index_by_hotkey (grub_menu_t menu, int hotkey)
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{
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grub_menu_entry_t entry;
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int i;
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for (i = 0, entry = menu->entry_list; i < menu->size;
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i++, entry = entry->next)
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if (entry->hotkey == hotkey)
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return i;
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return -1;
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}
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/* Return the timeout style. If the variable "timeout_style" is not set or
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invalid, default to TIMEOUT_STYLE_MENU. */
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static enum timeout_style
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get_timeout_style (void)
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{
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const char *val;
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struct timeout_style_name *style_name;
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val = grub_env_get ("timeout_style");
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if (val)
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for (style_name = timeout_style_names; style_name->name; style_name++)
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if (grub_strcmp (style_name->name, val) == 0)
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return style_name->style;
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return TIMEOUT_STYLE_MENU;
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}
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/* Return the current timeout. If the variable "timeout" is not set or
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invalid, return -1. */
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int
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@ -488,6 +536,33 @@ get_entry_number (grub_menu_t menu, const char *name)
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return entry;
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}
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/* Check whether a second has elapsed since the last tick. If so, adjust
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the timer and return 1; otherwise, return 0. */
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static int
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has_second_elapsed (grub_uint64_t *saved_time)
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{
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grub_uint64_t current_time;
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current_time = grub_get_time_ms ();
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if (current_time - *saved_time >= 1000)
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{
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*saved_time = current_time;
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return 1;
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}
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else
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return 0;
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}
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static void
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print_countdown (struct grub_term_coordinate *pos, int n)
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{
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grub_term_restore_pos (pos);
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/* NOTE: Do not remove the trailing space characters.
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They are required to clear the line. */
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grub_printf ("%d ", n);
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grub_refresh ();
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}
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#define GRUB_MENU_PAGE_SIZE 10
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/* Show the menu and handle menu entry selection. Returns the menu entry
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@ -502,6 +577,7 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
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grub_uint64_t saved_time;
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int default_entry, current_entry;
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int timeout;
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enum timeout_style timeout_style;
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default_entry = get_entry_number (menu, "default");
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@ -510,8 +586,71 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
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if (default_entry < 0 || default_entry >= menu->size)
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default_entry = 0;
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timeout = grub_menu_get_timeout ();
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if (timeout < 0)
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/* If there is no timeout, the "countdown" and "hidden" styles result in
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the system doing nothing and providing no or very little indication
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why. Technically this is what the user asked for, but it's not very
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useful and likely to be a source of confusion, so we disallow this. */
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grub_env_unset ("timeout_style");
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timeout_style = get_timeout_style ();
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if (timeout_style == TIMEOUT_STYLE_COUNTDOWN
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|| timeout_style == TIMEOUT_STYLE_HIDDEN)
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{
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static struct grub_term_coordinate *pos;
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int entry = -1;
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if (timeout_style == TIMEOUT_STYLE_COUNTDOWN && timeout)
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{
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pos = grub_term_save_pos ();
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print_countdown (pos, timeout);
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}
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/* Enter interruptible sleep until Escape or a menu hotkey is pressed,
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or the timeout expires. */
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saved_time = grub_get_time_ms ();
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while (1)
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{
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int key;
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key = grub_getkey_noblock ();
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if (key != GRUB_TERM_NO_KEY)
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{
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entry = get_entry_index_by_hotkey (menu, key);
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if (entry >= 0)
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break;
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}
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if (key == GRUB_TERM_ESC)
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{
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timeout = -1;
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break;
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}
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if (timeout > 0 && has_second_elapsed (&saved_time))
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{
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timeout--;
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if (timeout_style == TIMEOUT_STYLE_COUNTDOWN)
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print_countdown (pos, timeout);
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}
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if (timeout == 0)
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/* We will fall through to auto-booting the default entry. */
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break;
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}
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grub_env_unset ("timeout");
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grub_env_unset ("timeout_style");
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if (entry >= 0)
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{
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*auto_boot = 0;
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return entry;
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}
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}
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/* If timeout is 0, drawing is pointless (and ugly). */
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if (grub_menu_get_timeout () == 0)
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if (timeout == 0)
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{
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*auto_boot = 1;
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return default_entry;
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@ -540,18 +679,11 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
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if (grub_normal_exit_level)
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return -1;
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if (timeout > 0)
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if (timeout > 0 && has_second_elapsed (&saved_time))
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{
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grub_uint64_t current_time;
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current_time = grub_get_time_ms ();
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if (current_time - saved_time >= 1000)
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{
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timeout--;
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grub_menu_set_timeout (timeout);
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saved_time = current_time;
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menu_print_timeout (timeout);
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}
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timeout--;
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grub_menu_set_timeout (timeout);
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menu_print_timeout (timeout);
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}
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if (timeout == 0)
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@ -653,16 +785,15 @@ run_menu (grub_menu_t menu, int nested, int *auto_boot)
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default:
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{
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grub_menu_entry_t entry;
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int i;
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for (i = 0, entry = menu->entry_list; i < menu->size;
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i++, entry = entry->next)
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if (entry->hotkey == c)
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{
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menu_fini ();
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*auto_boot = 0;
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return i;
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}
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int entry;
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entry = get_entry_index_by_hotkey (menu, c);
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if (entry >= 0)
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{
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menu_fini ();
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*auto_boot = 0;
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return entry;
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}
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}
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break;
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}
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@ -186,6 +186,7 @@ export GRUB_DEFAULT \
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GRUB_HIDDEN_TIMEOUT \
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GRUB_HIDDEN_TIMEOUT_QUIET \
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GRUB_TIMEOUT \
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GRUB_TIMEOUT_STYLE \
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GRUB_DEFAULT_BUTTON \
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GRUB_HIDDEN_TIMEOUT_BUTTON \
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GRUB_TIMEOUT_BUTTON \
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@ -282,14 +282,45 @@ fi
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make_timeout ()
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{
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if [ "x${1}" != "x" ] ; then
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if [ "x${GRUB_HIDDEN_TIMEOUT_QUIET}" = "xtrue" ] ; then
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verbose=
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else
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verbose=" --verbose"
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if [ "x${GRUB_TIMEOUT_STYLE}" != "x" ] ; then
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cat << EOF
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if [ x\$feature_timeout_style = xy ] ; then
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set timeout_style=${GRUB_TIMEOUT_STYLE}
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set timeout=${2}
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EOF
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if [ "x${GRUB_TIMEOUT_STYLE}" != "xmenu" ] ; then
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# Fallback hidden-timeout code in case the timeout_style feature
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# is unavailable. Note that we now ignore GRUB_HIDDEN_TIMEOUT
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# and take the hidden-timeout from GRUB_TIMEOUT instead.
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if [ "x${GRUB_TIMEOUT_STYLE}" = "xhidden" ] ; then
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verbose=
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else
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verbose=" --verbose"
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fi
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cat << EOF
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elif sleep$verbose --interruptible ${2} ; then
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set timeout=0
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EOF
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fi
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cat << EOF
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if sleep$verbose --interruptible ${1} ; then
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fi
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EOF
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elif [ "x${1}" != "x" ] ; then
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if [ "x${2}" != "x0" ] ; then
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grub_warn "$(gettext "Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.")"
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fi
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if [ "x${GRUB_HIDDEN_TIMEOUT_QUIET}" = "xtrue" ] ; then
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verbose=
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style="hidden"
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else
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verbose=" --verbose"
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style="countdown"
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fi
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cat << EOF
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if [ x\$feature_timeout_style = xy ] ; then
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set timeout_style=$style
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set timeout=${1}
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elif sleep$verbose --interruptible ${1} ; then
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set timeout=${2}
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fi
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EOF
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