Added sample script

1) Added sample script for deleting cache
   Added sample script file which removes cache file and stats file
   by limiting disk space.
   This script is based DPeuscher posted codes, special thanks.

   Issue 364: Feature request: Control cache size



git-svn-id: http://s3fs.googlecode.com/svn/trunk@472 df820570-a93a-0410-bd06-b72b767a4274

test/sample_delcache.sh

@@ -0,0 +1,107 @@
+#!/bin/sh
+#
+# This is unsupport sample deleting cache files script.
+# So s3fs's local cache files(stats and objects) grow up,
+# you need to delete these.
+# This script deletes these files with total size limit
+# by sorted atime of files.
+# You can modify this script for your system.
+#
+# [Usage] script <bucket name> <cache path> <limit size> [-silent]
+#
+
+func_usage()
+{
+  echo ""
+  echo "Usage:  $1 <bucket name> <cache path> <limit size> [-silent]"
+  echo "        $1 -h"
+  echo "Sample: $1 mybucket /tmp/s3fs/cache 1073741824"
+  echo ""
+  echo "  bucket name = bucket name which specified s3fs option"
+  echo "  cache path  = cache directory path which specified by"
+  echo "                use_cache s3fs option."
+  echo "  limit size  = limit for total cache files size."
+  echo "                specify by BYTE"
+  echo "  -silent     = silent mode"
+  echo ""
+}
+
+PRGNAME=`basename $0`
+
+if [ "X$1" = "X-h" -o "X$1" = "X-H" ]; then
+  func_usage $PRGNAME
+  exit 0
+fi
+if [ "X$1" = "X" -o "X$2" = "X" -o "X$3" = "X" ]; then
+  func_usage $PRGNAME
+  exit -1
+fi
+
+BUCKET=$1
+CDIR=$2
+LIMIT=$3
+SILENT=0
+if [ "X$4" = "X-silent" ]; then
+  SILENT=1
+fi
+FILES_CDIR=$CDIR/$BUCKET
+STATS_CDIR=$CDIR/\.$BUCKET\.stat
+
+#
+# Check total size
+#
+if [ $LIMIT -ge `du -sb $FILES_CDIR | awk '{print $1}'` ]; then
+  if [ $SILENT -ne 1 ]; then
+    echo "$FILES_CDIR is below allowed $LIMIT"
+  fi
+  exit 0
+fi
+
+#
+# Make file list by sorted access time
+#
+ALL_STATS_ATIMELIST=`find $STATS_CDIR -type f -exec echo -n {} \; -exec echo -n " " \; -exec stat -c %X {} \; | awk '{print $2":"$1}' | sort`
+
+#
+# Remove loop
+#
+TMP_ATIME=0
+TMP_STATS=""
+TMP_CFILE=""
+for part in $ALL_STATS_ATIMELIST; do
+  TMP_ATIME=`echo $part | sed 's/\:/ /' | awk '{print $1}'`
+  TMP_STATS=`echo $part | sed 's/\:/ /' | awk '{print $2}'`
+  TMP_CFILE=`echo $TMP_STATS | sed s/\.$BUCKET\.stat/$BUCKET/`
+
+  if [ `stat -c %X $TMP_STATS` -eq $TMP_ATIME ]; then
+    rm -f $TMP_STATS $TMP_CFILE > /dev/null 2>&1
+    if [ $? -ne 0 ]; then
+      if [ $SILENT -ne 1 ]; then
+        echo "ERROR: Could not remove files($TMP_STATS,$TMP_CFILE)"
+      fi
+      exit -1
+    else
+      if [ $SILENT -ne 1 ]; then
+        echo "remove file: $TMP_CFILE	$TMP_STATS"
+      fi
+    fi
+  fi
+
+  if [ $LIMIT -ge `du -sb $FILES_CDIR | awk '{print $1}'` ]; then
+    if [ $SILENT -ne 1 ]; then
+      echo "finish removing files"
+    fi
+    break
+  fi
+done
+
+if [ $SILENT -ne 1 ]; then
+  TOTAL_SIZE=`du -sb $FILES_CDIR | awk '{print $1}'`
+  echo "Finish: $FILES_CDIR total size is $TOTAL_SIZE"
+fi
+
+exit 0
+
+#
+# End
+#