thorny (for me) permissions problem

[Valentin Bud]

Hello mr. John,

On Tue, Oct 7, 2008 at 2:54 PM, John Almberg <jalmberg at identry.com> wrote:

> The following permissions problem has me stumped:
>
> 1. User A uploads a file (using ftp) to the server, into a directory called
> 'data' owned by user B. Permissions on directory set to allow this, like
> this:
>        drwxrwxr-x  2 user_b user_b   512 Oct  7 08:40 data
>
> 2. A cron job, run by user B, then processes the file
>
> 3. When the processing is complete, the cron job needs to delete the file
> from the server
>
> 4. however, after upload, the file has the ownership A:B (i.e, owned by A,
> group B) with permissions -rw-r--r--. So B does not have permission to
> delete the file.
>        -rw-r--r-- 1 user_a user_b 154879 Oct 7 08:40 data_file.csv
>
> The ftp user can manually change the permissions on the file to -rw-rw-r--,
> but I do not want to depend on the user remembering to change permissions.
> If he forgets, the cronjob will process the file over and over again. I need
> the server to handle this, so it gets done correctly 100% of the time.
>
> B does not have sufficient permissions to delete the file or change it's
> permissions. The only thing I can think of is to have ANOTHER cron job, run
> by A, run every few minutes to check for the existence of a file, and change
> the permissions so B can delete it. But this smells like a kludge to me.
>
> Is there a correct way to handle this? For instance, is there something I
> can set in A's profile, so when he uploads a file, the group permission is
> set to rw? That would be a nice clean way to do it, but I can't find
> anything like that.
>
> Any help, much appreciated.
>
> -- John


 Depends on what ftp daemon you use. All the ftp server programs
have a way to enforce the umask. See http://en.wikipedia.org/wiki/Umask for
a better understanding to what umask is.

all the best,
v

>
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