make-release: Add a script for generating Raspberry Pi Imager releases

Create an EEPROM update zip files for use with the Raspberry Pi Imager.
The Raspberry Pi Imager JSON will soon be updated to support the 3
different boot priority choices offered by raspi-config.

imager/make-release

@@ -0,0 +1,65 @@
+#!/bin/sh
+
+# Generates three variants of the rpi-eeprom-recovery.zip file for
+# SD, USB and NETWORK priority matching the raspi-config options.
+
+set -e
+
+script_dir=$(cd "$(dirname "$0")" && pwd)
+tmp_dir=""
+
+die() {
+   echo "$@" >&2
+   exit 1
+}
+
+cleanup() {
+   if [ -d "${tmp_dir}" ]; then
+      rm -rf "${tmp_dir}"
+   fi
+   tmp_dir=""
+}
+
+gen_release() {
+   config="${1}"
+   out="${2}"
+
+   [ -f "${config}" ] || die "File not found \"${config}\""
+
+   (
+      tmp_dir="$(mktemp -d)"
+      cd "${tmp_dir}"
+      cp "${script_dir}/vl805.bin" .
+      cp "${script_dir}/README.txt" .
+      sha256sum vl805.bin | awk '{print $1}' > vl805.sig
+
+      "${script_dir}/../rpi-eeprom-config" \
+         --config "${script_dir}/${config}" --out pieeprom.bin \
+         "${script_dir}/pieeprom.bin" || die "Failed to create update EEPROM config with  \"${config}\""
+      sha256sum pieeprom.bin | awk '{print $1}' > pieeprom.sig
+      echo "Creating ${out}"
+      zip "${out}" *
+   )
+}
+
+usage() {
+cat <<EOF
+   make-release <tag>
+
+   Example tag "2020-09-03-vl805-000138a1"
+EOF
+exit
+}
+
+trap cleanup EXIT
+tag="${1}"
+[ -n "${tag}" ] || usage
+release_dir="${script_dir}/release"
+rm -rf "${release_dir}"
+mkdir "${release_dir}"
+
+# Build the different boot priority flavours
+gen_release boot-conf-default.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}.zip"
+gen_release boot-conf-sd.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-sd.zip"
+gen_release boot-conf-usb.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-usb.zip"
+gen_release boot-conf-network.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-network.zip"