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chmod fails to ignore symbolic links during recursive directory transver
From: |
Mark Brand |
Subject: |
chmod fails to ignore symbolic links during recursive directory transversals |
Date: |
Wed, 09 Mar 2005 10:16:45 +0100 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041220 |
I hope I'm not making a fool of myself, but here we go:
version: coreutils-5.2.1-3.rpm (from SuSE 9.2). Linux kernel 2.6.11.1.
reiserfs.
Quoting from the last paragraph of the DESCRIPTION chmod man page:
However, for each symbolic link listed on the command line, chmod
changes the permissions of the pointed-to file. In contrast, chmod
ignores symbolic links encountered during recursive directory traversals.
The 2nd sentence states that chmod ignores symbolc links during
recursive directory traversals. The info page for chmod agrees:
`-P'
Do not traverse any symbolic links. This is the default if none
of `-H', `-L', or `-P' is specified. *Note Traversing symlinks::.
The actual behavior of chmod appears to be to recursively follow
symbolic links. To wit:
haydn:~ # mkdir sandbox
haydn:~ # cd sandbox/
haydn:~/sandbox # mkdir -p a/aa/aaa
haydn:~/sandbox # touch foo
haydn:~/sandbox # mkdir b
haydn:~/sandbox # cd a/aa/aaa/
haydn:~/sandbox/a/aa/aaa # ln -s ../../../foo foo
haydn:~/sandbox/a/aa/aaa # ln -s ../../../b b
haydn:~/sandbox/a/aa/aaa # cd ../../..
haydn:~/sandbox # ls -l
total 2
drwxr-xr-x 4 root root 120 Mar 9 10:03 .
drwx------ 37 root root 2304 Mar 9 10:02 ..
drwxr-xr-x 3 root root 72 Mar 9 10:03 a
drwxr-xr-x 2 root root 48 Mar 9 10:03 b
-rw-r--r-- 1 root root 0 Mar 9 10:03 foo
haydn:~/sandbox # chown -R nobody:users a
haydn:~/sandbox # ls -l
total 2
drwxr-xr-x 4 root root 120 Mar 9 10:03 .
drwx------ 37 root root 2304 Mar 9 10:02 ..
drwxr-xr-x 3 nobody users 72 Mar 9 10:03 a
drwxr-xr-x 2 nobody users 48 Mar 9 10:03 b
-rw-r--r-- 1 nobody users 0 Mar 9 10:03 foo
Moreover, there doesn't seem to be any way of invoking chmod so that it
operates recursively on a directory tree but ignores (doesn't follow)
symbolic links.
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