Date: Sat, 23 Jan 2010 23:35:20 -0800 From: Doug Hardie <bc979@lafn.org> To: John <john@starfire.mn.org> Cc: freebsd-questions - <freebsd-questions@freebsd.org> Subject: Re: Migration planning - old system to new Message-ID: <97F6366F-5364-4990-A794-047F3E5B2FB1@lafn.org> In-Reply-To: <20100124004211.B64294@starfire.mn.org> References: <20100122111219.A31898@starfire.mn.org> <20100123161934.GA27277@gizmo.acns.msu.edu> <20100123110827.A54749@starfire.mn.org> <201001241055.17552.oceanare@pacific.net.sg> <20100124004211.B64294@starfire.mn.org>
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On 23 January 2010, at 22:42, John wrote:
> On Sun, Jan 24, 2010 at 10:55:14AM +0800, Erich Dollansky wrote:
>> Hi,
>>=20
>> On 24 January 2010 am 01:08:27 John wrote:
>>> doing this on a new machine! And I don't need any "migration"
>>> storage, because, well, gosh - it's tcp, people! ;) I just
>>> did the first transfer of home, and it went swell:
>>>=20
>> how did you handle the strange group IDs?
>=20
> Have not done that yet. My current best plan (which I'm not really
> crazy about, but haven't come up with anything better) is to do
> 121 "find /home -uid ... -exec chown {} +" and 37
> "find /home -gid ... -exec chgrp {} +" commands. This is also called
> "Let's modify every inode in the filesystem. Twice." Oh, well, the
> ctimes are blown up by the migration anyway (as they really should =
be).
> I have to be careful, if there are any IDs that are used on both
> systems, but with different associations, to do the change in=20
> the right order (sigh). I could try to get really fancy and just
> find the distinct combinations of "uid:gid" and do only one
> "chown uid:gid" for each file, but, getting it done will be more
> important than being pretty at some point.
You might check out tar. At one time it had the option to use user and =
group names and not ids. Hence the ids could change between the 2 =
systems. It seems like it was on FreeBSD 3 or 4 that I last did that.
I just tried it with FreeBSD 7.2 creating a tar file. Digging through =
the file it shows the ascii names for owner and group - not uid/gid. I =
un-tar'd it on a Mac and sure enough it used the names and the uids are =
quite different for the two systems.=
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