step2.sh: Detect non-1TR and issue a user-friendly diagnostic

Signed-off-by: Hector Martin <[email protected]>

Author: marcan

m1n1

@@ -15,6 +15,30 @@ echo
 echo "VGID: $VGID"
 echo "System volume: $system_dir"
 echo
+
+if ! bputil -d -v "$VGID" | grep -q 'one true recoveryOS'; then
+    echo "Your system did not boot in One True RecoveryOS (1TR) mode."
+    echo
+    echo "To perform step 2 of the installation, the system must be in"
+    echo "this special mode. Perhaps you forgot to hold down the power"
+    echo "button, or momentarily released it at some point?"
+    echo
+    echo "Note that tapping and then pressing the power button again will"
+    echo "allow you to see the boot picker screen, but you will not be"
+    echo "in the correct 1TR mode. You must hold down the power button"
+    echo "in one continuous motion as you power on the machine."
+    echo
+    echo "Your system will now shut down. Once the screen goes blank,"
+    echo "please wait 10 seconds, then press the power button and do not"
+    echo "release it until you see the 'Entering startup options...'"
+    echo "message, then try running this script from recoveryOS again."
+    echo
+    echo "Press enter to shut down your system."
+    read
+    shutdown -h now
+    exit 1
+fi
+
 echo "You will be prompted for login credentials two times."
 echo "Please enter your macOS credentials (for the macOS that you"
 echo "used to run the first step of the installation)."
@@ -26,6 +50,9 @@ read
 
 bputil -nc -v "$VGID"
 
+echo
+echo
+
 if [ -f m1n1.macho ]; then
     kmutil configure-boot -c m1n1.macho -v "$system_dir"
 else