Add info on accepting terms and conditions.

README.md

@@ -13,6 +13,17 @@ are added.
 
 ## Usage
 
+### Accepting Let's Encrypt's terms
+
+In order to issue certificates with Let's Encrypt, you must agree to the
+Let's Encrypt terms of service. You can do this by running the command
+`/dehydrated --register --accept-terms` from within the container.
+
+For ease of automation, you can define the `ACCEPT_CA_TERMS` env var
+(with any non-empty value) to automatically accept the terms. Be warned
+that doing so will automatically accept any future changes to the terms
+of service.
+
 ### Defining domains
 
 The container defines one volume at `/letsencrypt`, and expects there to be

run.sh

@@ -8,9 +8,15 @@ interrupt() {
 
 trap interrupt SIGINT
 
+if [ -n "${ACCEPT_CA_TERMS:-}" ]; then
+  DEHYDRATED_CMD="/dehydrated --accept-terms"
+else
+  DEHYDRATED_CMD="/dehydrated"
+fi
+
 while true; do
-  /dehydrated --cron --hook /dns/hook --challenge dns-01
-  /dehydrated --cleanup
+  $DEHYDRATED_CMD --cron --hook /dns/hook --challenge dns-01
+  $DEHYDRATED_CMD --cleanup
   inotifywait --timeout 86400 /letsencrypt/domains.txt
   sleep 60
 done