Delete a file from a CGI

Steve Holden steve at holdenweb.com
Tue Jun 5 02:20:39 CEST 2007


Matias Surdi wrote:
> Steve Holden escribió:
> 
>> Matias Surdi wrote:
>>> Thanks for your reply.
>>>
>>> This is the code that creates the file:
>>> lock_file = open(".lock","w")
>>> lock_file.write("test")
>>> lock_file.close()
>>> #Change permissions so that CGI can write lock file
>>> os.chmod(".lock",stat.S_IMODE(stat.S_IRWXU | stat.S_IRWXO |
>>> stat.S_IRWXG))
>>>
>>> This script was run as root.
>>>
>>> Now, the code of the CGI that should delete the file:
>>>
>>> #As you see, I can write to the file
>>> lock_file = open(".lock","w")
>>> lock_file.write("")
>>> lock_file.close()
>>> # But the following line raises a "permission denied" OSError
>>> os.remove(".lock")
>>>
>>> I've seen that the script is running as "nobody", but, the file is rwx by
>>> everybody. I've also tryed changing the owner of the file to "nobody"
>>> also, but no luck anyway.
>>>
>>> Thanks a lot.
>>>
>>>
>>> Steve Holden wrote:
>>>
>>>> Matias Surdi wrote:
>>>>> HI!
>>>>>
>>>>> I want to delete a file from a CGI, but I always get a Permission
>>>>> denied error.
>>>>>
>>>>> I've tryed this after creating the file (from a normal script):
>>>>>
>>>>> os.chmod(".lock",stat.S_IMODE(stat.S_IRWXU | stat.S_IRWXO |
>>>>> stat.S_IRWXG))
>>>>> os.chown(".lock",pwd.getpwnam("nobody")[2],pwd.getpwnam("nobody")[3])
>>>>>
>>>>> but the CGI still can't delete the file.
>>>>>
>>>>> I will appreciate very much your help.
>>>>>
>>>>> Thanks a lot.
>>>>>
>>>>>
>>>> How was the file created in the first place? If you don't have
>>>> permissions to delete it you may well not have permissions to reown it
>>>> or change its permissions either!
>>>>
>> Most likely, your problem is that to delete a file you need write
>> permissions on the directory that contains it [1]. Apparently the web
>> user (nobody, or apache, or whatever) doesn't have those permissions.
>>
>> regards
>>   Steve
>>
>> [1]: Unless the sticky bit is set on the containing directory, when
>> other tests are applied instead. If this makes no sense to you, ignore it.
> 
> 
> Hi!
> 
> I feel so s**id.... it's very likely to be that the problem.... I'll try
> this next week at work.
> 
> Thanks a lot for the cold water on the face!
> 
Hey, it's just information: no need to overreact!

regards
  Steve
-- 
Steve Holden        +1 571 484 6266   +1 800 494 3119
Holden Web LLC/Ltd           http://www.holdenweb.com
Skype: holdenweb      http://del.icio.us/steve.holden
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