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bug#17103: regression: cp -al doesn't copy symlinks, but tries to link t
From: |
Pádraig Brady |
Subject: |
bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail) |
Date: |
Wed, 26 Mar 2014 19:57:50 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
On 03/26/2014 06:08 PM, Linda Walsh wrote:
> have a simple test case:
> as root (w /umask 002):
>
> mkdir -p dir/{a,b}
> touch dir/b/file
> ln -s ../b/file dir/a/symfile
> ---
>
> So now tree should look like:
>
>> tree -AFugp dir
>
> dir
> +-- [drwxrwxr-x root root ] a/
> | +-- [lrwxrwxrwx root root ] symfile -> ../b/file
> +-- [drwxrwxr-x root root ] b/
> +-- [-rw-rw-r-- root root ] file
> ----
>
> Now, w/normal user, who is in group root, try:
>
> cp -al dir dir2
> cp: cannot create hard link ‘dir2/dir/a/symfile’ to ‘dir/a/symfile’:
> Operation not permitted
> -----
>
> Trying to link to a symlink is the bug --
> it used to duplicate the symlink.
>
> This is a recent behavior
> change -- i.e. looking at earlier behavior, the symlinks,
> like the directories are created as the 'user', and
> only files are linked to.
>
> Core utils version: 8.21 (suse rpm coreutils-8.21-7.7.7.x86_64)
>
> Any idea how this managed to be broken?
So I think the change to use hardlinks to symlinks rather than new symlinks
happened with:
http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=commitdiff;h=594292a1
I.E. The "new symlink" behaviour only happened between v8.0 and v8.10 inclusive.
So why is the hardlink to symlink being disallowed?
I wonder is it due to "protected_hardlinks":
http://danwalsh.livejournal.com/64493.html
If we fell back to using symlinks, would that only
push the perm issue on to when the symlink was followed?
Pádraig.
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Linda Walsh, 2014/03/26
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail),
Pádraig Brady <=
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Pádraig Brady, 2014/03/26
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Linda Walsh, 2014/03/26
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Kees Cook, 2014/03/27
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Linda Walsh, 2014/03/27
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Linda Walsh, 2014/03/27
- bug#17103: regression: cp -al doesn't copy symlinks, but tries to link to them (fail), Kees Cook, 2014/03/28