tty-ask-password-agent: log when starting a query on the console

When looking at logs from a boot with an encrypted device, I see
(with unrelevant messages snipped):
[    2.751692] systemd[1]: Started Dispatch Password Requests to Console.
[    7.929199] systemd-cryptsetup[258]: Set cipher aes, mode xts-plain64, key size 512 bits for device /dev/disk/by-uuid/2d9b648a-15b1-4204-988b-ec085089f8ce.
[    9.499483] systemd[1]: Finished Cryptography Setup for luks-2d9b648a-15b1-4204-988b-ec085089f8ce.

There is a hug gap in timing without any explanatory message. If I didn't type
in the password, there would be no way to figure out why things blocked from
this log, so let's log something to the log too.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/tty-ask-password-agent/tty-ask-password-agent.c b/src/tty-ask-password-agent/tty-ask-password-agent.c
index 80f5408e12..08e191faf0 100644
--- a/src/tty-ask-password-agent/tty-ask-password-agent.c
+++ b/src/tty-ask-password-agent/tty-ask-password-agent.c
@@ -143,10 +143,9 @@ static int agent_ask_password_tty(
                 char ***ret) {
 
         int tty_fd = -1, r;
+        const char *con = arg_device ?: "/dev/console";
 
         if (arg_console) {
-                const char *con = arg_device ?: "/dev/console";
-
                 tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY);
                 if (tty_fd < 0)
                         return log_error_errno(tty_fd, "Failed to acquire %s: %m", con);
@@ -155,6 +154,7 @@ static int agent_ask_password_tty(
                 if (r < 0)
                         log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
 
+                log_info("Starting password query on %s.", con);
         }
 
         r = ask_password_tty(tty_fd, message, NULL, until, flags, flag_file, ret);
@@ -162,6 +162,9 @@ static int agent_ask_password_tty(
         if (arg_console) {
                 tty_fd = safe_close(tty_fd);
                 release_terminal();
+
+                if (r >= 0)
+                        log_info("Password query on %s finished successfully.", con);
         }
 
         return r;