Forcing group and permissions for created file inside folder?

Question

I need that for the folder /var/www when my user testuser creates a file the permissions are g+rwx and the files belong to the group www-data

Any idea of how could I do that ?

Cheers.

EDIT:

I'm creating the files via SSH.

Answer 1

To set the group, give /var/www the setgid bit:

chgrp www-data /var/www
chmod g+s /var/www

To also adjust subdirectories: find /var/www -type d -exec chmod g+s {} +

This will make all newly created files inherit the parent directory's group, instead of the user's.

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To set the default group permissions, you will have to use ACLs. Set a "default" ACL:

setfacl -m "default:group::rwx" /var/www

To also adjust subdirectories: find /var/www -type d -exec setfacl -m d:g::rwx {} +

Note: The file system must have ACL support enabled. Sometimes it is on by default; on ext3 or ext4 you might get "Operation not supported", in which case it must be enabled manually:

• For a currently mounted filesystem: mount -o remount,acl /

• Permanently – one of the methods below:

  • at fstab level: edit /etc/fstab to have acl in the options field

  • at filesystem level: tune2fs -o acl /dev/diskname

Answer 2

The group of the files being created by an user is the group of that user (in /etc/group). The permissions are controlled by the UMASK parameter see this