159 lines
3.5 KiB
Bash
159 lines
3.5 KiB
Bash
#!/bin/bash
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#
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###############################################################################
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# Author : Louwrentius
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# Contact : louwrentius@gmail.com
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# Initial release : August 2011
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# Licence : Simplified BSD License
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###############################################################################
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VERSION=1.01
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#
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# Mounted volume to be monitored.
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#
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MOUNT="$1"
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#
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# Maximum threshold of volume used as an integer that represents a percentage:
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# 95 = 95%.
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#
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MAX_USAGE="$2"
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#
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# Failsafe mechansim. Delete a maxium of MAX_CYCLES files, raise an error after
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# that. Prevents possible runaway script. Disable by choosing a high value.
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#
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MAX_CYCLES=10
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show_header () {
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echo
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echo DELETE OLD FILES $VERSION
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echo
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}
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show_header
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reset () {
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CYCLES=0
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OLDEST_FILE=""
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OLDEST_DATE=0
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ARCH=`uname`
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}
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reset
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if [ -z "$MOUNT" ] || [ ! -e "$MOUNT" ] || [ ! -d "$MOUNT" ] || [ -z "$MAX_USAGE" ]
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then
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echo "Usage: $0 <mountpoint> <threshold>"
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echo "Where threshold is a percentage."
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echo
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echo "Example: $0 /storage 90"
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echo "If disk usage of /storage exceeds 90% the oldest"
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echo "file(s) will be deleted until usage is below 90%."
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echo
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echo "Wrong command line arguments or another error:"
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echo
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echo "- Directory not provided as argument or"
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echo "- Directory does not exist or"
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echo "- Argument is not a directory or"
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echo "- no/wrong percentage supplied as argument."
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echo
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exit 1
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fi
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check_capacity () {
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USAGE=`df -h | grep "$MOUNT" | awk '{ print $5 }' | sed s/%//g`
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if [ ! "$?" == "0" ]
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then
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echo "Error: mountpoint $MOUNT not found in df output."
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exit 1
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fi
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if [ -z "$USAGE" ]
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then
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echo "Didn't get usage information of $MOUNT"
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echo "Mountpoint does not exist or please remove trailing slash."
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exit 1
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fi
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if [ "$USAGE" -gt "$MAX_USAGE" ]
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then
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echo "Usage of $USAGE% exceeded limit of $MAX_USAGE percent."
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return 0
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else
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echo "Usage of $USAGE% is within limit of $MAX_USAGE percent."
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return 1
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fi
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}
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check_age () {
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FILE="$1"
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if [ "$ARCH" == "Linux" ]
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then
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FILE_DATE=`stat -c %Z "$FILE"`
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elif [ "$ARCH" == "Darwin" ]
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then
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FILE_DATE=`stat -f %Sm -t %s "$FILE"`
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else
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echo "Error: unsupported architecture."
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echo "Send a patch for the correct stat arguments for your architecture."
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fi
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NOW=`date +%s`
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AGE=$((NOW-FILE_DATE))
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if [ "$AGE" -gt "$OLDEST_DATE" ]
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then
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export OLDEST_DATE="$AGE"
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export OLDEST_FILE="$FILE"
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fi
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}
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process_file () {
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FILE="$1"
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#
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# Replace the following commands with wathever you want to do with
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# this file. You can delete files but also move files or do something else.
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#
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echo "Deleting oldest file $FILE"
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rm -f "$FILE"
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}
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while check_capacity
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do
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if [ "$CYCLES" -gt "$MAX_CYCLES" ]
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then
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echo "Error: after $MAX_CYCLES deleted files still not enough free space."
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exit 1
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fi
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reset
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FILES=`find "$MOUNT" -type f`
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IFS=$'\n'
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for x in $FILES
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do
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check_age "$x"
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done
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if [ -e "$OLDEST_FILE" ]
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then
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#
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# Do something with file.
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#
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process_file "$OLDEST_FILE"
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else
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echo "Error: somehow, item $OLDEST_FILE disappeared."
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fi
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((CYCLES++))
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done
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# Delete empty directories while we’re at it
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find "$MOUNT" -type d -empty -delete
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echo
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