Delete a file from a CGI

[Matias Surdi]

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!