fixup! generate_payload: handle the downloading of releases

generate_payload

@@ -2,11 +2,14 @@
 
 set -e
 
-if [ $# -ne 1 ]; then
+if [ $# -lt 1 ]; then
     echo "usage: $0 alpha:1786.0.0 beta:1781.2.0"
     exit 1
 fi
 
+# DOWNLOAD can be set to 1 to download release artifacts automatically.
+DOWNLOAD="${DOWNLOAD:-0}"
+
 if [ -z "${PRIVATE_KEYS}" ]; then
     echo "PRIVATE_KEYS must be set using the URI form (https://www.rfc-editor.org/rfc/rfc7512#section-2.3)"
     echo "or using an absolute or relative path."
@@ -366,10 +369,12 @@ mkdir -p "${GNUPGHOME}"
 chmod 700 "${GNUPGHOME}"
 trap 'rm -rf ${GNUPGHOME}' EXIT
 
-echo "Downloading files"
-pushd ./data
-./download_payloads "$@"
-popd
+if [ "${DOWNLOAD}" != 0 ]; then
+    echo "Downloading files"
+    pushd ./data
+    ./download_payloads "$@"
+    popd
+fi
 
 # Setup GnuPG for verifying the image signature
 gpg --batch --quiet --import <<< "${GPG_KEY}"