From d6044b2c13b73613d72a3d4f769aa9d0be33336b Mon Sep 17 00:00:00 2001
From: Tom Wilkie <tom@weave.works>
Date: Mon, 17 Aug 2015 15:21:33 +0000
Subject: [PATCH] Rebuild images every 24hrs

---
 rebuild-image | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rebuild-image b/rebuild-image
index 3fcc9a490..0e582b0ba 100755
--- a/rebuild-image
+++ b/rebuild-image
@@ -33,6 +33,11 @@ has_changes() {
 	[ "$changes" -gt 0 ]
 }
 
+commit_timestamp() {
+	local rev=$1
+	git show -s --format=%ct $rev
+}
+
 cached_revision=$(cached_image_rev)
 if [ -z "$cached_revision" ]; then
 	echo ">>> No cached image found; rebuilding"
@@ -47,6 +52,12 @@ if has_changes $cached_revision $CIRCLE_SHA1 ; then
 	exit 0
 fi
 
+if [ "$(commit_timestamp $cached_revision)" -lt "$(( $(date +%s) - 86400 ))" ]; then
+	echo ">>> Image is more the 24hrs old; rebuilding"
+	rebuild
+	exit 0
+fi
+
 # we didn't rebuild; import cached version
 echo ">>> No changes found, importing cached image"
 docker load -i $CACHEDIR/$SAVEDNAME-$cached_revision