From c1a6ad0a3681328704743bb4a3508cc88d594ff9 Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Thu, 1 May 2014 00:31:43 +0100
Subject: [PATCH] Make rerendering of low zoom tiles on a style change more
 robust

---
 .../tile/templates/default/update-lowzoom.erb | 27 ++++++++++++-------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/cookbooks/tile/templates/default/update-lowzoom.erb b/cookbooks/tile/templates/default/update-lowzoom.erb
index a9a55cb48..946aa2996 100644
--- a/cookbooks/tile/templates/default/update-lowzoom.erb
+++ b/cookbooks/tile/templates/default/update-lowzoom.erb
@@ -5,15 +5,24 @@
 # Send output to the log
 exec > /var/log/tile/update-lowzoom-<%= @style %>.log 2>&1
 
-# Update tiles from z0 to z12 for style "<%= @style %>"
-render_list \
-  --all --force \
-  --tile-dir=/srv/tile.openstreetmap.org/tiles \
-  --socket=/var/run/renderd/renderd.sock \
-  --num-threads=<%= ( node[:cpu][:total] - 2 ) / 2 %> \
-  --map="<%= @style %>" \
-  --max-load=70 \
-  --min-zoom=0 --max-zoom=12
+# Define function to update tiles from z0 to z12 for style "<%= @style %>"
+function update_tiles
+{
+  render_old \
+    --timestamp=$(stat -c %Y "/srv/tile.openstreetmap.org/styles/<%= @style %>/project.xml") \
+    --tile-dir=/srv/tile.openstreetmap.org/tiles \
+    --socket=/var/run/renderd/renderd.sock \
+    --num-threads=<%= ( node[:cpu][:total] - 2 ) / 2 %> \
+    --map="<%= @style %>" \
+    --max-load=70 \
+    --min-zoom=0 --max-zoom=12
+}
+
+# Loop running the update command until it suceeds
+until update_tiles
+do
+  sleep 30
+done
 
 # Update timestamp for style "<%= @style %>"
 touch \
-- 
2.43.2