mtree acl support

[Tim Kientzle]

On Jan 15, 2014, at 9:11 PM, Tim Kientzle <tim at kientzle.com> wrote:

> 
> On Jan 14, 2014, at 6:47 AM, Mark Felder <feld at freebsd.org> wrote:
> 
>> I was recently talking to someone about how one would backup / restore
>> ACLs reliably. I didn't see any mention of ACLs in the mtree man page
>> and after a quick google I came upon this old mailing list post:
>> 
>> http://lists.freebsd.org/pipermail/freebsd-hackers/2008-April/024173.html
>> 
>> patch in list is here: http://heka.cenkes.org/sat/diffs/mtree_acl.diff
>> I've mirrored it here: https://feld.me/freebsd/mtree_acl.diff
>> 
>> This old patch appears to still apply cleanly. I hate to see a patch die
>> and be forgotten.
> 
> One problem that ‘tar’ has addressed (inspired by Joerg Schilling’s
> work on star) is to permit ACLs to be restored even if the user database
> is out of date.
> 
> This is done by including a fourth field in each ACE with the
> numeric user ID.
> 
> I suspect you want to do the same for mtree.  I thought
> I remembered acl_to_text having an option to use
> an extended text format, so it might be a trivial change.

Also, comparing ACLs using strcmp() seems a little odd to me.

Tim