cleanlogs.py

#!/bin/python3
# created_at: 03.11.2023
# Truncates Log Files to size 0 in /var/log, /tmp and /var/lib/docker/containers
# returns metric message
import logging
import sys
import os

from operator import add
from pathlib import Path

logging.basicConfig(stream=sys.stdout, level=logging.ERROR)

dockerContainerPath="/var/lib/docker/containers"
sysLogPath="/var/log"
tmpLogPath="/tmp"

def cleanLogsInPath(p, selector="*.log"):
    amount=0
    cleanedAmount=0
    failedAmount=0
    for path in Path(p).rglob(selector):
        fpath=path.resolve()

        if not os.path.isfile(path):
            continue

        amount+=1

        try:
            with open(fpath, 'r+') as f:
                f.truncate(0)
                logging.info("[+] truncated logfile '{}'".format(fpath))
                cleanedAmount+=1
        except Exception as e:
                logging.exception(e)
                print("[-] ERROR".format(e))
                failedAmount+=1
    
    return [amount, cleanedAmount, failedAmount]

def calcSums (ar=[]):
    previous=[]
    for i in range(0, len(ar)):
        if i == 0:
            previous=ar[i]
        else:
            previous=list( map(add, previous, ar[i]) )
    return previous


amounts = [
    cleanLogsInPath (dockerContainerPath),
    cleanLogsInPath (sysLogPath, selector="*"),
    cleanLogsInPath (tmpLogPath)
]

sums = calcSums(amounts)

totalFiles=sums[0]
totalCleaned=sums[1]
totalFailed=sums[2]

totalOperations = len(amounts)

percentageSuccess = round((totalCleaned/totalFiles), 2)*100

print("[+] Truncated Log Files. [operations: {}, total: {}, success: {}, failed: {}, percent:{:.2f}]".format(totalOperations, totalFiles, totalCleaned, totalFailed, percentageSuccess))