From 594b65f8960c38fde1a8ffd567df852a69a670ff Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Wed, 9 Dec 2015 00:10:14 +0100
Subject: Add an option --min-age.

---
 letsencrypt | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/letsencrypt b/letsencrypt
index 5c10ea1..4c932e4 100755
--- a/letsencrypt
+++ b/letsencrypt
@@ -17,6 +17,7 @@ declare -l GENKEY
 declare RUNAS QUIET= DEBUG=
 
 declare SRVCRT= CHAIN= CSR SRVKEY
+delcale -i MIN_AGE=0
 declare -l HASH=
 declare SUBJECT=/
 declare SAN=
@@ -62,6 +63,8 @@ usage() {
 		                      (default: "digitalSignature,keyEncipherment,keyCertSign")
 		    --chain           Store not only the server certificate in the file specified with --output, but
 		                      also the CA's
+		    --min-age=SECONDS Don't do anything if the certificate specified by --output exists and its expiration
+		                      is more than SECONDS ahead.
 		    --output=FILE     Where to store the issued (signed) X.509 certificate
 		    --notify=COMMAND  Command to run upon success.  (This option can be repeated.)
 
@@ -97,6 +100,7 @@ while [ $# -gt 0 ]; do
         --debug) DEBUG=1;;
 
         --output=*) SRVCRT="${1#*=}";;
+        --min-age=*) MIN_AGE="${1#*=}";;
         --chain) CHAIN=1;;
         --csr=*) CSR="${1#*=}";;
         --key=*) SRVKEY="${1#*=}";;
@@ -164,6 +168,12 @@ elif [ "$COMMAND" = 'new-cert' ]; then
         echo "Error: Missing --output" >&2
         exit 1
     fi
+    if [ -s "$SRVCRT" ] && \
+         exp=$(openssl x509 -noout -enddate <"$SRVCRT" 2>/dev/null) && \
+         [ $(( $(date -d "${exp#*=}" +%s) - $(date +%s))) -gt $MIN_AGE ]; then
+        [ ! "$DEBUG" ] || echo "Expiration date ($(date -d"${exp#*=}")) is too far away, come back later." >&2
+        exit 0
+    fi
 
     # Generate a Certificate Signing Request if need be
     if [ ${CSR+x} ]; then
-- 
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