cros-build: add octopus.sh build script

Add octopus.sh script to set up the CrOS SDK chroot for octopus, build
a custom branch of Depthcharge and replace the payload in the Coreboot
firmware image.  The output is stored in a new file in
firmware/octopus-new.bin which can be accessed from the host.
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>

cros-build/setup/Dockerfile

@@ -57,3 +57,4 @@ RUN git config --global user.email cros-sdk-firmware@collabora.com
 ARG cros_device
 ENV CROS_DEVICE=$cros_device
 ADD --chown=cros-build create-chroot.sh create-chroot.sh
+ADD --chown=cros-build $cros_device.* src/scripts/

cros-build/setup/octopus.sh

+#!/bin/bash
+
+set -e
+
+export ACCEPT_LICENSE=Google-TOS
+export BOARD=octopus
+
+cmd_setup() {
+    ./setup_board --board=$BOARD
+}
+
+cmd_checkout() {
+    echo "board: ${BOARD}"
+    cros_workon --board ${BOARD} start depthcharge
+    cd ../platform/depthcharge
+    git fetch \
+        https://gitlab.collabora.com/chromium/depthcharge.git \
+        firmware-octopus-11297.83.B-gtucker
+    git checkout FETCH_HEAD
+    cd -
+}
+
+cmd_build() {
+    emerge-${BOARD} depthcharge
+}
+
+cmd_image() {
+    local output=firmware/${BOARD}-new.bin
+
+    cp firmware/${BOARD}.bin ${output}
+    cbfstool \
+        ${output} \
+        remove \
+        -n fallback/payload \
+        -r COREBOOT
+    cbfstool \
+        ${output} \
+        add-payload \
+        -r COREBOOT \
+        -n fallback/payload \
+        -f /build/octopus/firmware/depthcharge/dev.elf
+
+    ls -l ${output}
+}
+
+cmd_$1
+
+exit 0