routeros_firmware: Initial version of role

roles/routeros_firmware/files/download-routeros-firmware.sh

@@ -0,0 +1,40 @@
+#!/bin/sh
+
+set -eu
+
+umask 022
+
+cd /srv/web/oob.foo.sh/routeros
+
+verbose=false
+if [ "${1:-}" = "-v" ]; then
+    verbose=true
+    shift
+fi
+
+if [ $# -gt 0 ]; then
+    echo "Usage: $(basename "$0") [-v]" 1>&2
+    exit 1
+fi
+
+packageurl="$(curl -sSf "https://mikrotik.com/download" | \
+    sed -n 's/.*<a href="\(.*routeros-[0-9\.]*-arm\.npk\)">.*/\1/p')"
+packagename="$(basename "$packageurl")"
+if [ -f "$packagename" ]; then
+    "$verbose" && echo "Already up to date"
+    exit 0
+fi
+
+checksum="$(curl -sSf "https://mikrotik.com/download" | \
+	sed -n 's/.*routeros-[0-9\.]*-arm\.npk<\/td>.*<td>SHA256<\/td><td>\(.*\)<\/td>.*/\1/p')"
+
+echo "Downloading new package '${packagename}'"
+trap 'rm -f -- "${packagename}.tmp"' EXIT
+curl -sSf -o "${packagename}.tmp" "$packageurl"
+
+if [ "$(sha256sum "${packagename}.tmp" | cut -d " " -f 1)" != "$checksum" ]; then
+    echo "ERR: Checksum check failed, not saving package" 1>&2
+    exit 1
+fi
+
+mv "${packagename}.tmp" "$packagename"