Added FileGrouper class for .tar genereation.

import os

import shutil

import sys

import subprocess

class FileGrouper(object):    

    # Constructor requiring the path of the folder, the minimum number of files

    # and the maximum folder size in bytes

    def __init__(self, folderPath, minNumOfFiles, maxFolderSize):

        self.folderPath = folderPath

        self.minNumOfFiles = minNumOfFiles

        self.maxFolderSize = maxFolderSize

    # Returns a list of all the 'leaves' (directories not

    # containing subdirectories) within the path

    def getLeaves(self):

        leaves = []

        for root, dirs, files in os.walk(self.folderPath):

            if not dirs:

                leaves.append(root)    

        return leaves

    # Returns the folder size in bytes

    def getFolderSize(self, folder):

        files = [ os.path.abspath(f) for f in os.listdir() ]

        folderSize = 0

        for f in files:

            statinfo = os.stat(f)

            folderSize += statinfo.st_size

        return folderSize

    # Returns the number of files contained into a folder

    def getNumOfFiles(self, folder):

        return len(os.listdir(folder))

    # Start the .tar creation procedure

    def start(self):

        leaves = self.getLeaves()

        for folder in leaves:

            if(self.getNumOfFiles(folder) > self.minNumOfFiles and self.getFolderSize(folder) < self.maxFolderSize):

                cwd = os.getcwd()

                parent = os.path.dirname(folder)

                os.chdir(parent)

                sp = subprocess.run(["tar", "-cf", os.path.basename(folder) + ".tar", os.path.basename(folder)], capture_output = True)

                if(sp.returncode or sp.stderr):

                    sys.exit(f"Error: cannot create a .tar for {folder}")

                else:

                    try:

                        shutil.rmtree(folder)

                    except OSError as e:

                        print(f"Error: {folder} => {e.strerror}")

                os.chdir(cwd)

# Test (creates a .tar of all the leaves containing at least 2 files and having size lower than 100G, 

# than removes that directories)

fg = FileGrouper("/home/cristiano/Lavoro/md5_test/store/a", 1, 100 * (2 ** 30))

fg.start()

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