change-time: Ask whether to retry, don't say "any key", loop instead of recurse

Ask whether to retry instead of always retrying, so users can escape
if there is a problem setting the date instead of being forced to enter
values until it works.

Ask to press Enter instead of "any key".  "Any key" prompts are
generally misleading, because there are usually keys that won't
actually work (e.g. Ctrl, Caps Lock, Shift).

Loop to retry if setting the date fails instead of recursing.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

initrd/bin/change-time

@@ -28,31 +28,40 @@ get_date () {
     value="$(printf "%0${#max}u" "$value")"
 }
 
-get_date "year" "2024" "2200"
-year=$value
-get_date "month" "01" "12"
-month=$value
-get_date "day" "01" "31"
-day=$value
-get_date "hour" "00" "23"
-hour=$value
-get_date "minute" "00" "59"
-min=$value
-get_date "second" "00" "59"
-sec=$value
+enter_time_and_change()
+{
+    get_date "year" "2024" "2200"
+    year=$value
+    get_date "month" "01" "12"
+    month=$value
+    get_date "day" "01" "31"
+    day=$value
+    get_date "hour" "00" "23"
+    hour=$value
+    get_date "minute" "00" "59"
+    min=$value
+    get_date "second" "00" "59"
+    sec=$value
 
-if ! date -s "$year-$month-$day $hour:$min:$sec" &>/dev/null; then
-    echo "The date is not correct, press any key to try again"
-    echo -e "\n"
-    read -n 1 nothing
-    clear
-    change-time
-else
-    hwclock -w
-    echo -e "The system date has been sucessfully set to $year-$month-$day $hour:$min:$sec"
-    echo -e "\n"
+    if ! date -s "$year-$month-$day $hour:$min:$sec" &>/dev/null; then
+        return 1
+    fi
+    return 0
+}
 
-    echo -e "Press any key to return to the menu"
-    echo -e "\n"
-    read -n 1 nothing
-fi
+while ! enter_time_and_change; do
+    echo "Could not set the date to $year-$month-$day $hour:$min:$sec"
+    read -rp "Try again? [Y/n]: " try_again_confirm
+    if [ "${try_again_confirm^^}" = N ]; then
+            exit 1
+    fi
+    echo
+done
+
+hwclock -w
+echo "The system date has been sucessfully set to $year-$month-$day $hour:$min:$sec"
+echo
+
+echo "Press Enter to return to the menu"
+echo
+read -r nothing