update/blobs/*: unified download/checksum logic

Use the same logic between blobs/download and blobs/mrc.

The logic is taken from blobs/download.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/include/fetch.sh b/include/fetch.sh
new file mode 100755
index 00000000..08a1d044
--- /dev/null
+++ b/include/fetch.sh
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-3.0-only
+# SPDX-FileCopyrightText: 2023 Leah Rowe <leah@libreboot.org>
+
+agent="Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0"
+dl_path=""
+
+fetch()
+{
+	dl_type="${1}"
+	dl="${2}"
+	dl_bkup="${3}"
+	dlsum="${4}"
+	dl_path="${5}"
+	_fail="${6}"
+
+	mkdir -p "${dl_path%/*}" || "${_fail}" "fetch: !mkdir ${dl_path%/*}"
+
+	dl_fail="y"
+	vendor_checksum "${dlsum}" "${dl_path}" && dl_fail="n"
+	for url in "${dl}" "${dl_bkup}"; do
+		[ "${dl_fail}" = "n" ] && break
+		[ -z "${url}" ] && continue
+		rm -f "${dl_path}" || "${_fail}" "fetch: !rm -f ${dl_path}"
+		wget --tries 3 -U "${agent}" "${url}" -O "${dl_path}" || \
+		    continue
+		vendor_checksum "${dlsum}" "${dl_path}" && dl_fail="n"
+	done
+	[ "${dl_fail}" = "y" ] && \
+		"${_fail}" "fetch ${dlsum}: matched file unavailable"
+
+	eval "extract_${dl_type}"
+}
+
+vendor_checksum()
+{
+	if [ "$(sha512sum ${2} | awk '{print $1}')" != "${1}" ]; then
+		printf "Bad checksum for file: %s\n" "${2}" 1>&2
+		rm -f "${2}" || :
+		return 1
+	fi
+}