adding linking scripts

scripts/signal/authorize.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+if [[ "$(hostname)" != "jeeves" ]]; then
+  echo "Signal device authorization must run on jeeves." >&2
+  exit 1
+fi
+if [[ "$EUID" -ne 0 ]]; then
+  echo "Signal device authorization must run as root." >&2
+  exit 1
+fi
+if [[ "$#" -ne 1 ]]; then
+  echo "Usage: signal_authorize.sh DEVICE_URI" >&2
+  exit 2
+fi
+if [[ "$1" != sgnl://linkdevice\?* ]]; then
+  echo "Invalid Signal device link URI." >&2
+  exit 2
+fi
+
+service_name="signal-cli"
+data_dir="/var/lib/signal-cli"
+device_uri="$1"
+restart_service=false
+
+cleanup() {
+  if [[ "$restart_service" == true ]]; then
+    systemctl start "$service_name"
+  fi
+}
+trap cleanup EXIT
+
+restart_service=true
+systemctl stop "$service_name"
+runuser -u signal-cli -- \
+  signal-cli --data-dir "$data_dir" -a +12016554378 addDevice --uri "$device_uri"