Make usb4-pd safer

you-ass-bee-see/usb4-pd.sh

@@ -1,12 +1,25 @@
 #!/usr/bin/env bash
 
-shopt -s nullglob
+MODEL="$(cat /sys/class/dmi/id/product_version)"
-set -ex
+if [[ "${MODEL}" != "galp5" ]]
+then
+	echo "${MODEL} is not galp5" >&2
+	exit 1
+fi
 
 I2C_PCI_SYSFS="/sys/bus/pci/devices/0000:00:15.1"
 I2C_SYSFS="$(echo "${I2C_PCI_SYSFS}/i2c_designware."*"/i2c-"*)"
 I2C_DEV="/dev/$(basename "${I2C_SYSFS}")"
 
+if [[ ! -c "${I2C_DEV}" ]]
+then
+	echo "failed to find I2C device" >&2
+	exit 1
+fi
+
+shopt -s nullglob
+set -ex
+
 cargo build \
     --release \
     --manifest-path ../tools/coreboot-collector/Cargo.toml \
@@ -23,7 +36,7 @@ sudo ./eeprog-0.7.6-tear12/eeprog \
     -r 0:32768 \
     -o eeprom.rom
 
-echo sudo ./eeprog-0.7.6-tear12/eeprog \
+sudo ./eeprog-0.7.6-tear12/eeprog \
     "${I2C_DEV}" \
     0x50 \
     -16 \