python grep reverse matching

Question

Hi Alls,

I would like to build a small python script that basicaly does the reverse of grep. I want to match the files in a directory/subdirectory that doesn't have a "searched_string".

So far i've done that:

import os

filefilter = ['java','.jsp'] 
path= "/home/patate/code/project"
for path, subdirs, files in os.walk(path):
    for name in files:
        if name[-4:] in filefilter :
        print os.path.join(path, name)

This small script will be listing everyfiles with "java" or "jsp" extension inside each subdirectory, and will output them full path.

I'm now wondering how to do the rest, for example i would like to be able if I forgot a session management entry in one file (allowing anyone a direct file access), to search for : "if (!user.hasPermission" and list the file which does not contain this string.

Any help would be greatly appreciated !

Thanks

Answer 1

To check if a file with a path bound to variable f contains a string bound to name s, simplest (and acceptable for most reasonably-sized files) is something like

with open(f) as fp:
    if s in fp.read():
        print '%s has the string' % f
    else:
        print '%s doesn't have the string' % f

In your os.walk loop, you have the root path and filename separately, so

f = os.path.join(path, name)

(what you're unconditionally printing) is the path you want to open and check.

Answer 2

Instead of printing file name call function that will check if file content do not match texts you want to have in source files. In such cases I use check_file() that looks like this:

WARNING_RX = (
    (re.compile(r'if\s+\(!\s+user.hasPermission'), 'user.hasPermission'),
    (re.compile(r'other regexp you want to have'), 'very important'),
    )

def check_file(fn):
    f = open(fn, 'r')
    content = f.read()
    f.close()
    for rx, rx_desc in WARNING_RX:
        if not rx.search(content):
            print('%s: not found: %s' % (fn, rx_desc))

Answer 3

I'm trying to get alex code to work, unfortunatly I'm a python beginner :(

I'm probably doing something wrong :

import sys,os

filefilter = ['.xml','java','.jsp','lass']

path= "/home/patate/code/project"

s = "helloworld"

for path, subdirs, files in os.walk(path):

for name in files:
    if name[-4:] in filefilter :
       f = str(os.path.join(path, name))
       with open(f) as fp:
           if s in f.read():
              print "%s has the string" % f
           else:
              print "%s doesn't have the string" % f

It exit with :

Traceback (most recent call last):

File "test.py", line 18, in

if s in f.read():

AttributeError: 'str' object has no attribute 'read'

Thanks for your help !