Partially fixes#2788. This change makes it so the lock screen is
redrawn whenever the caps lock modifier state changes, rather
on relying on the keypress event. This didn't work because
caps lock is disabled when the key is released, not pressed,
so the caps lock indicator does not go away until the next
keypress event.
Ctrl-D functions as EOF in most cases on the terminal. login(1) & many other
programs check the password on EOF, same as Enter. To make behavior consistent,
have swaylock submit the password on Ctrl-D.
This commit moves the handling for Enter into its own static function, which is
now also called on Ctrl-D.
I've got in the habit of using Ctrl-C with login(1) to restart password entry.
If Sway does the same thing I don't have to retrain my login muscle memory ;)
This involves setuid'ing swaylock, which then forks and drops perms on
the parent process. The child process remains root and listens on a pipe
for requests to validate passwords against /etc/shadow.
The whole state->xcb.modifiers thing didn't work at all (always 0)
The xkb doc says "[xkb_state_serialize_mods] should not be used in
regular clients; please use the xkb_state_mod_*_is_active API instead"
so here it is
- Replace char* with static array. Any chars > 1024 will be discarded.
- mlock() password buffer so it can't be written to swap.
- Clear password buffer after auth succeeds or fails.
This is basically the same treatment I gave the 0.15 branch in https://github.com/swaywm/sway/pull/1519
