Preset file and folder permissions

[Mnyb]

I know how change permissions and owners on files and folders .

But this is applies to files and folders that's already there . So you have to fix such things after the fact.

I want a folder where new files and folders that are added get a specific set of permissions regardless of what the app that created it was ( or which user was running it )

[aubuti]

It sounds as if umask is what you're looking for. Here is one reference for it, I'm sure you can turn up a lot more on the 'net.
http://www.cyberciti.biz/tips/unders...lue-usage.html

[Mnyb]

Umask seems useful . Thank you

But it is set per user and not per folder .

The tricky part is that I want every file created in a certain directory have a set of permissions .

A file created elsewhere should be created with the usual permissions .

I'll investigate more...

[aubuti]

The tricky part is that I want every file created in a certain directory have a set of permissions .

Hmm, that is tougher. Is this in a desktop environment? Because if it were a remote CIFS/SMB environment then I think Samba allows you to set the umask for different shares. But when you're accessing the directory directly I'm not sure how you would force different default permissions.

[epoch1970]

Depending on what you want to achieve you might be happy with a directory with the sticky bit set, or with a bind mount if the underlying fs allows options such as umask= or uid=. There is a FUSE module called bindfs that seems to allow specifying owner and rights.
If you have interest in exporting the dir outside the machine, then as Aubuti said Samba will help. NFS will do that too. (I suppose you can use NFS/Samba within the localhost… never tried that

In any case, I think you solution would probably include creating an extra group and/or user. Usually when you can't get the authorizations right, it's because groups need some mending.

(Brute force can help as well. I've sometimes used a script activated via the automounter or some other application to execute some random task before mounting a share. A cron job will fix anything, in time.)

[gharris999]

A simple one-time chown and chmod will do most of what you want.

Example: you want user 'fred' to be able to control all files created by any user in /tmp/bedrock and and subdirectories there of.

Logged in as user barney:

sudo mkdir /tmp/bedrock
sudo chown fred:fred /tmp/bedrock
sudo chmod 7777 /tmp/bedrock
cd /tmp
ls -l
#drwsrwsrwt 2 fred fred  4096 May 30 22:55 bedrock
cd bedrock
touch dino
ls -l dino
#-rw-rw-r-- 1 barney fred 0 May 30 23:02 dino
mkdir 'stone quarry'
ls -l 'stone quarry'
#drwxrwsr-x 2 barney fred 4096 May 30 23:07 stone quarry
cd 'stone quarry'
touch rocks
ls -l rocks
#drwxrwsr-x 2 barney fred 4096 May 30 23:07 rocks
mkdir "../fred's house"
cd "../fred's house"
touch wilma
ls -l wilma
#-rw-rw-r-- 1 barney fred 0 May 30 23:09 wilma
cd /tmp
rm -R -f ./bedrock
#rm: cannot remove `bedrock': Operation not permitted
sudo -u fred rm -R -f ./bedrock
ls -l
#ls: cannot access ./bedrock: No such file or directory

So, you can see by setting the 'sticky bit' and the UID & GID with the initial chmod 7777 on fred owned /tmp/bedrock, any subsequent files or directories created will be read/write/execute/delete-able by fred. The files created by user barney were owned by barney, but they belonged to the fred group. Thus fred could do anything he pleased with the files.