Justfile: prototype remote drive unlock

Justfile

@@ -114,25 +114,52 @@ verify-vnc sshserver attempts="10":
 	export MAGICK_ARGS="-filter Catrom -density 72 -resample 300 -contrast -normalize -despeckle -type grayscale -sharpen 1 -posterize 3 -negate -gamma 100 -blur 1x65535"
 	export TESS_ARGS="-c debug_file=/dev/null --psm 4"
 
-	send_and_compare() {
-		local EXPECT="$(pwgen -0 12)"
-		ssh -4 ${SSHOPTS} root@{{sshserver}} "echo -e '\0033\0143'${EXPECT}>> /dev/tty0" 1>/dev/null 2>&1
+	function send() {
+		local what="${1:?need something to send}"
+		ssh -4 ${SSHOPTS:?need sshopts} root@{{sshserver}} "echo -e ${what}>> /dev/tty0" &>/dev/null
+	}
+
+	function expect() {
+		local what="${1:?need something to expect}"
 		vncdo --server=${VNCSOCK} --password=${VNCPW} --disable-desktop-resizing --nocursor capture $PWD/screenshot.bmp
 		convert ${MAGICK_ARGS} screenshot.bmp screenshot.tiff
 		tesseract ${TESS_ARGS} screenshot.tiff screenshot
-		grep --quiet ${EXPECT} screenshot.txt
+		grep --quiet "${what}" screenshot.txt
 	}
 
-	trap "E=$?; set +e; rm screenshot.*; echo Exiting...; exit $E" INT TERM HUP
+	function send_and_expect() {
+		local send="${1:?need something to send}"
+		local expect="${2:?need something to expect}"
+		send "${send}"
+		expect "${expect}"
+	}
+
+	trap 'E=$?; set +e; rm screenshot.*; echo Exiting...; kill $(jobs -p | cut -d " " -f 4); exit $E' EXIT
 
 	for i in `seq 1 {{attempts}}`; do
-		if send_and_compare; then
+		echo Attempt $i...
+		expect="$(pwgen -0 12)"
+		send="'\0033\0143'${expect}"
+		if send_and_expect "${send}" "${expect}"; then
+			pipe=$(mktemp -u)
+			mkfifo ${pipe}
+			exec 3<>${pipe}
+			rm ${pipe}
+
 			echo Verification succeeded at attempt $i. Unlocking remote drive...
-			if $GETPWD | head -n1 | ssh -4 ${SSHOPTS} root@{{sshserver}} "cryptsetup-askpass && exit 0" 1>/dev/null 2>&1 > /dev/null; then
-				echo Unlock successful!
+			ssh -4 ${SSHOPTS} root@{{sshserver}} "cryptsetup-askpass" <&3 &>/dev/null &
+			eval ${GETPW} | head -n1 >&3
+
+			for j in `seq 1 120`; do
+				sleep 0.5
+				if expect '— success'; then
+					echo Unlock successful.
 					exit 0
 				fi
+			done
+
 			echo Unlock failed...
+			exit 1
 		fi
 	done
 	echo Verification failed {{attempts}} times. Giving up...