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imagine the following folder structure



I have two user groups:

  • editors
  • managers

Users of both groups should be able to

  • create new files
  • modify any files
  • delete any files

in ../documents.

Both groups should also be able to read any files in ../documents/templates.

Only users in group "managers" should be able to

  • create new files
  • modify any files
  • delete any files

in ../documents/templates.

The directory "../documents/templates" should be undeletable for both groups!

How can I achieve that? I came to the conclusion, that this isn't possible with Linux (even with POSIX ACLs), because you need to set g=rwx for "documents", which will allow users of both groups to create/delete/modify any files in that directory... but +w also allows the deletion of the subdirectory "templates" and I don't know a way to deny that.

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migrated from stackoverflow.com Sep 8 '11 at 21:15

This question came from our site for professional and enthusiast programmers.

No one will be able to delete ../documents/templates if it contains anything else. So, you could create a subdirectory ../documents/templates/.hidden, with 000 permissions, and put an empty file inside that (well, before setting the 000 permissions, obviously). Then rmdir ../documents/templates will fail, as will rmdir ../documents/templates/.hidden.

Edit: to borrow from another answer that was deleted, if you're superuser, you could do this instead, which is a little simpler:

cd ../documents/templates
touch .locked
chattr +i .locked

(chattr needs to be run as superuser.)

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