From ae97379c98c9d116b0fd062f61796b1652ba74c9 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 9 Oct 2018 22:10:22 +0200
Subject: removeOldBackups: only remove backups older than one year

---
 removeOldBackups.in | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/removeOldBackups.in b/removeOldBackups.in
index 67d0828..c1602d2 100755
--- a/removeOldBackups.in
+++ b/removeOldBackups.in
@@ -7,26 +7,33 @@
 
 usage () {
   >&2 echo \
-'Usage: removeOldBackups
-Remove old backups keeping only one backup per month for all but the present year.
+'Usage: removeOldBackups [-n]
+Remove backups older than one year, keeping only one backup per month.
 
 Options:
-#HELPTEXT#  #'
+#HELPTEXT#  #
+  -n         only print what would be removed'
   [ -n "$1" ] && exit $1
   exit 1
 }
 
+no_action=false
+
 if [ $# -eq 1 ]
 then
-  if [ "$1" == "--help" ]
+  if [ "x$1" == 'x--help' ]
   then
     usage 0
-  elif [ "$1" == "--version" ]
+  elif [ "x$1" == 'x--version' ]
   then
     >&2 echo '#VERSION#'
     exit 0
+  elif [ "x$1" == 'x-n' ]
+  then
+    no_action=true
+  else
+    usage
   fi
-  usage
 elif [ $# -gt 1 ]
 then
   usage
@@ -53,14 +60,19 @@ backups=$(
     sort -k5,5 -k4,4 -k3,3 -k2,2 -k1,1 | \
     uniq -f2
   printf '%s\n' "${backups}" | \
-    sed '
-      / '"$(date +%Y)"' \S\+$/p
-    '
+    sed "$(
+      for dist in $(seq 0 20 365); do
+        printf '/ %s \S\+$/p\n' \
+          "$(date '+%m %Y' -d@$(($(date +%s)-24*60*60*${dist})))"
+      done
+    )"
 } | \
   cut -d' ' -f1 | \
   sort | \
   uniq -u | \
   while read -r dir; do
     echo rm -rf --one-file-system "${dir}"
-    rm -rf --one-file-system "${dir}"
+    if ! ${no_action}; then
+      rm -rf --one-file-system "${dir}"
+    fi
   done
-- 
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