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bug#15173: [cp] --link overrides dereference settings
From: |
Pádraig Brady |
Subject: |
bug#15173: [cp] --link overrides dereference settings |
Date: |
Mon, 04 Nov 2013 09:37:07 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
On 11/04/2013 12:48 AM, Bernhard Voelker wrote:
> On 11/02/2013 01:07 AM, Pádraig Brady wrote:
>> So I would be 60:40 for going with Gian's addition
>> of dereferencing with just `cp -l`, and I would be
>> 60:40 against changing the behavior of `ln` even though
>> it would now be inconsistent with `cp -l` (and still inconsistent with BSD).
>
> Thanks for the summary.
>
> After playing a bit more, I'd also tend to use Gian's solution:
> hard links to symbolic links are probably not that useful, because
> * they have the same owner/group as the original symbolic link which
> could lead to problems with permissions during removal of the symlink
> in a sticky dir like /tmp), and
> * the target cannot be changed without creating the symlink again
> which is problematic to remember in both places.
>
> BUT I'm not happy at all with the following case:
>
> $ : > file
> $ ln -s file filelink
> $ src/cp --link filelink dst--link
> $ src/cp --link -R filelink dst--link-R
> $ ls -ldogi file filelink dst--link dst--link-R
> 537364 -rw-r--r-- 2 0 Nov 4 01:30 dst--link
> 537365 lrwxrwxrwx 2 4 Nov 4 01:30 dst--link-R -> file
> 537364 -rw-r--r-- 2 0 Nov 4 01:30 file
> 537365 lrwxrwxrwx 2 4 Nov 4 01:30 filelink -> file
>
> That's exactly what Gian was worried about in a different case
> of my solution: it *matters* whether the rather unrelated -R option
> is specified or not. ;-(
>
> It got late again. I'll have a look tomorrow again - maybe there
> are no side effects with the following:
>
> diff --git a/src/cp.c b/src/cp.c
> index 7bc8630..78c0a04 100644
> --- a/src/cp.c
> +++ b/src/cp.c
> @@ -1135,7 +1135,7 @@ main (int argc, char **argv)
>
> if (x.dereference == DEREF_UNDEFINED)
> {
> - if (x.recursive)
> + if (x.recursive && ! x.hard_link)
> /* This is compatible with FreeBSD. */
> x.dereference = DEREF_NEVER;
> else
Yes I didn't consider -R in the table as I don't see any reason
for it to behave differently when -l is specified (and -l aplies
neither to POSIX or BSD (comment)). So the above adjustment
looks correct to me.
thanks,
Pádraig.
- bug#15173: [cp] --link overrides dereference settings, Pádraig Brady, 2013/11/01
- bug#15173: [cp] --link overrides dereference settings, Bernhard Voelker, 2013/11/03
- bug#15173: [cp] --link overrides dereference settings,
Pádraig Brady <=
- bug#15173: [cp] --link overrides dereference settings, Gian Piero Carrubba, 2013/11/04
- bug#15173: [cp] --link overrides dereference settings, Bernhard Voelker, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Gian Piero Carrubba, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Pádraig Brady, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Gian Piero Carrubba, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Bernhard Voelker, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Jim Meyering, 2013/11/07
- bug#15173: [cp] --link overrides dereference settings, Bernhard Voelker, 2013/11/07