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Postings from June 2008
Aristotle Pagaltzis writes: > On Win32, files can inherit permissions from the directory they’re > in, which is why not carrying the permissions along from the old > file is OK and even desirable. No such thing exists in Unix. Depending on what one means by “inherit”, that’s not quite true. Consider setgid directories: $ mkdir foo $ chgrp admin foo $ ls -ld foo drwxrwxr-x 2 aaron admin 4096 2008-06-13 11:52 foo $ touch foo/normal-file $ mkdir foo/normal-dir $ chmod g+s foo $ ls -ld foo drwxrwsr-x 3 aaron admin 4096 2008-06-13 11:52 foo $ touch foo/setgid-file $ mkdir foo/setgid-dir $ ls -l foo total 8K drwxrwxr-x 2 aaron aaron 4096 2008-06-13 11:52 normal-dir -rw-rw-r-- 1 aaron aaron 0 2008-06-13 11:52 normal-file drwxrwsr-x 2 aaron admin 4096 2008-06-13 11:52 setgid-dir -rw-rw-r-- 1 aaron admin 0 2008-06-13 11:52 setgid-file Files created inside a setgid directory acquire the group ownership of the directory; directories created inside a setgid directory additionally acquire the setgid bit. That transcript was done on Linux; as I understand it, BSD-derived systems, including Mac OS X, treat all directories as setgid. My caveat about the meaning of “inherit” is that this only applies at the instant when an inode is created with its initial name a child of a directory with setgid semantics. I’m not sufficiently familiar with Win32 to know whether the permission inheritance you mention applies to, for example, files moved into a directory after their creation. -- Aaron Crane ** http://aaroncrane.co.uk/Thread Previous | Thread Next