+#!/bin/sh
+# Install or copy LetsEncrypt certificates on/from server.
+#
+# First argument: server
+# Second argument: "get" or "put"
+#
+# "get" copies the server's /etc/letsencrypt to a local letsencrypt.tar.
+#
+# "set" copies a local letsencrypt.tar to the server's /etc/letsencrypt.
+set -e
+
+# Ensure we have a server name as argument.
+if [ $# -lt 2 ]; then
+ echo "Need server and action as arguments."
+ false
+fi
+server="$1"
+action="$2"
+
+# So we only get asked once for decrypting our key.
+eval $(ssh-agent)
+ssh-add ~/.ssh/id_rsa
+
+if [ "${action}" = "get" ]; then
+ # Get /etc/letsencrypt/ as tar file.
+ ssh -t plom@${server} 'su -c "cd /etc/ && tar cf letsencrypt.tar letsencrypt && chown plom:plom letsencrypt.tar && mv letsencrypt.tar /home/plom/"'
+ scp plom@${server}:~/letsencrypt.tar .
+elif [ "${action}" = "put" ]; then
+ # Expand letsencrypt.tar to /etc/letsencrypt/ on server.
+ scp letsencrypt.tar plom@${server}:~/
+ ssh -t plom@${server} 'su -c "rmdir /etc/letsencrypt && mv letsencrypt.tar /etc/ && cd /etc/ && tar xf letsencrypt.tar && rm letsencrypt.tar"'
+else
+ echo "Action must be 'get', or 'put'."
+ false
+fi