From a7117c08a9a8253f2fcb849199f1334be204ad74 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 9 Oct 2018 21:13:54 +0200
Subject: removeOldBackups new

---
 .gitignore          |  1 +
 Makefile            |  6 ++---
 removeOldBackups.in | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 3 deletions(-)
 create mode 100755 removeOldBackups.in

diff --git a/.gitignore b/.gitignore
index c636107..e0a3b50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ backup
 backupStatistics
 fastRepair
 lastBackups
+removeOldBackups
 man.commons
 *.common
 *.1
diff --git a/Makefile b/Makefile
index 8e76d11..67ae044 100644
--- a/Makefile
+++ b/Makefile
@@ -27,7 +27,7 @@ MANDIR	 = /usr/share/man
 
 VERSION  = 1.2.2
 
-all: man.commons backup backup.1 lastBackups lastBackups.1 backupStatistics backupStatistics.1
+all: man.commons backup backup.1 backupStatistics backupStatistics.1 lastBackups lastBackups.1 removeOldBackups removeOldBackups.1
 
 %: %.in
 	sed " \
@@ -46,8 +46,8 @@ all: man.commons backup backup.1 lastBackups lastBackups.1 backupStatistics back
 .PHONY:	install dist clean
 
 install: all
-	install -D -m0755 -t $(DESTDIR)$(BINDIR) backup backupStatistics lastBackups
-	install -D -m0644 -t $(DESTDIR)$(MANDIR)/man1 backup.1 lastBackups.1 backupStatistics.1
+	install -D -m0755 -t $(DESTDIR)$(BINDIR) backup backupStatistics lastBackups removeOldBackups
+	install -D -m0644 -t $(DESTDIR)$(MANDIR)/man1 backup.1 backupStatistics.1 lastBackups.1 removeOldBackups.1
 	install -D -m0644 -t $(DESTDIR)$(ETCDIR) backup.conf
 
 clean:
diff --git a/removeOldBackups.in b/removeOldBackups.in
new file mode 100755
index 0000000..67d0828
--- /dev/null
+++ b/removeOldBackups.in
@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# removeOldBackups version #VERSION#
+
+[ -r "#ETCDIR#/backup.conf" ] && \
+  . "#ETCDIR#/backup.conf"
+
+usage () {
+  >&2 echo \
+'Usage: removeOldBackups
+Remove old backups keeping only one backup per month for all but the present year.
+
+Options:
+#HELPTEXT#  #'
+  [ -n "$1" ] && exit $1
+  exit 1
+}
+
+if [ $# -eq 1 ]
+then
+  if [ "$1" == "--help" ]
+  then
+    usage 0
+  elif [ "$1" == "--version" ]
+  then
+    >&2 echo '#VERSION#'
+    exit 0
+  fi
+  usage
+elif [ $# -gt 1 ]
+then
+  usage
+fi
+
+backups=$(
+  printf '%s\n' "${backups[@]}" | \
+    cut -d' ' -f1 | \
+    while read -r dir; do \
+      if [ $(ls "$dir" | wc -l) -lt 30 ]; then
+        continue;
+      fi
+      ls -1 "$dir" | \
+        sed -n '
+          s,^\([0-9]\{4\}\)_\([0-9]\{2\}\)_\([0-9]\{2\}\)$,'"${dir}"'\0 \3 \2 \1 '"${dir}"',
+          T
+          p
+        '
+    done
+)
+
+{
+  printf '%s\n' "${backups}" | \
+    sort -k5,5 -k4,4 -k3,3 -k2,2 -k1,1 | \
+    uniq -f2
+  printf '%s\n' "${backups}" | \
+    sed '
+      / '"$(date +%Y)"' \S\+$/p
+    '
+} | \
+  cut -d' ' -f1 | \
+  sort | \
+  uniq -u | \
+  while read -r dir; do
+    echo rm -rf --one-file-system "${dir}"
+    rm -rf --one-file-system "${dir}"
+  done
-- 
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