X-Git-Url: https://git.openstreetmap.org/chef.git/blobdiff_plain/e873a471eb6f2311dc4aab6362949f453ce917a9..6766749acda8c73f24cdb134f697f24942bfe50f:/cookbooks/tile/templates/default/replicate.erb

diff --git a/cookbooks/tile/templates/default/replicate.erb b/cookbooks/tile/templates/default/replicate.erb
index 5d940375b..37925c52f 100644
--- a/cookbooks/tile/templates/default/replicate.erb
+++ b/cookbooks/tile/templates/default/replicate.erb
@@ -2,9 +2,15 @@
 
 # DO NOT EDIT - This file is being maintained by Chef
 
-# Initialize timestamp with day of latest planet dump
-# Setting to midnight ensures we get conistent data after first run
-# osmosis --read-replication-interval-init
+# Before running updates, the replication needs to be set up with the timestamp
+# set to the day of the latest planet dump. Setting to midnight ensures we get
+# conistent data after first run. osmosis --read-replication-interval-init is
+# used to initially create the state file
+
+# Define exit handler
+function onexit {
+    [ -f state-prev.txt ] && mv state-prev.txt state.txt
+}
 
 # Send output to the log
 exec > /var/log/tile/replicate.log 2>&1
@@ -12,6 +18,9 @@ exec > /var/log/tile/replicate.log 2>&1
 # Change to the replication state directory
 cd /var/lib/replicate
 
+# Install exit handler
+trap onexit EXIT
+
 # Read in initial state
 . state.txt
 
@@ -21,6 +30,9 @@ do
     # Work out the name of the next file
     file="changes-${sequenceNumber}.osm.gz"
 
+    # Save state file so we can rollback if an error occurs
+    cp state.txt state-prev.txt
+
     # Fetch the next set of changes
     osmosis --read-replication-interval --simc --write-xml-change file="${file}" compressionMethod="gzip"
 
@@ -28,28 +40,31 @@ do
     if [ $? -eq 0 ]
     then
         # Enable exit on error
-	set -e
+        set -e
 
         # Remember the previous sequence number
-	prevSequenceNumber=$sequenceNumber
+        prevSequenceNumber=$sequenceNumber
 
         # Read in new state
-	. state.txt
+        . state.txt
 
         # Did we get any new data?
-	if [ "${sequenceNumber}" == "${prevSequenceNumber}" ]
+        if [ "${sequenceNumber}" == "${prevSequenceNumber}" ]
         then
             # Log the lack of data
-	    echo "No new data available. Sleeping..."
+            echo "No new data available. Sleeping..."
 
-	    # Remove file, it will just be an empty changeset
-	    rm ${file}
+            # Remove file, it will just be an empty changeset
+            rm ${file}
+
+            # No need to rollback now
+            rm state-prev.txt
 
             # Sleep for a short while
-	    sleep 30
-	else
+            sleep 30
+        else
             # Log the new data
-	    echo "Fetched new data from ${prevSequenceNumber} to ${sequenceNumber} into ${file}"
+            echo "Fetched new data from ${prevSequenceNumber} to ${sequenceNumber} into ${file}"
 
             # Apply the changes to the database
 <% if node[:tile][:node_file] -%>
@@ -58,20 +73,23 @@ do
             osm2pgsql --slim --append ${file}
 <% end -%>
 
+            # No need to rollback now
+            rm state-prev.txt
+
             # Expire tiles which are touched by the changes
             sudo -u www-data /usr/local/bin/expire-tiles ${file} > /dev/null 2>&1 &
-	fi
+        fi
 
         # Delete old downloads
-	find . -name 'changes-*.gz' -mmin +300 -exec rm -f {} \;
+        find . -name 'changes-*.gz' -mmin +300 -exec rm -f {} \;
 
         # Disable exit on error
         set +e
     else
         # Log our failure to fetch changes
-	echo "Failed to fetch changes - waiting a few minutes before retry"
+        echo "Failed to fetch changes - waiting a few minutes before retry"
 
         # Wait five minutes and have another go
-	sleep 300
+        sleep 300
     fi
 done