WIP: Choose WAL-G backup by start time when deleting

postgres-appliance/scripts/postgres_backup.sh

@@ -44,18 +44,18 @@ LEFT=0
 
 NOW=$(date +%s -u)
 readonly NOW
-while read -r name last_modified rest; do
-    last_modified=$(date +%s -ud "$last_modified")
-    if [ $(((NOW-last_modified)/86400)) -ge $DAYS_TO_RETAIN ]; then
-        if [ -z "$BEFORE" ] || [ "$last_modified" -gt "$BEFORE_TIME" ]; then
-            BEFORE_TIME=$last_modified
+while read -r name last_modified wal_segment_backup_start start_time rest; do
+    start_time=$(date +%s -ud "$start_time")
+    if [ $(((NOW-start_time)/86400)) -ge $DAYS_TO_RETAIN ]; then
+        if [ -z "$BEFORE" ] || [ "$start_time" -gt "$BEFORE_TIME" ]; then
+            BEFORE_TIME=$start_time
             BEFORE=$name
         fi
     else
         # count how many backups will remain after we remove everything up to certain date
         ((LEFT=LEFT+1))
     fi
-done < <($WAL_E backup-list 2> /dev/null | sed '0,/^name\s*\(last_\)\?modified\s*/d')
+done < <($WAL_E backup-list --detail 2> /dev/null | sed '0,/^name\s*\(last_\)\?modified\s*/d')
 
 # we want keep at least N backups even if the number of days exceeded
 if [ -n "$BEFORE" ] && [ $LEFT -ge $DAYS_TO_RETAIN ]; then