Re: [PLUG] Moving /usr to a new partition properly

["Michael Leone" <turgon@mike-leone.com>]

----- Original Message -----
From: "gabriel rosenkoetter" <gr@eclipsed.net>
To: <plug@lists.phillylinux.org>
Sent: Friday, November 10, 2000 1:33 PM
Subject: Re: [PLUG] Moving /usr to a new partition properly


> On Thu, Nov 09, 2000 at 11:08:56PM -0500, Barry Spindler wrote:
> > After formatting and mounting the new partition do
> >
> > cp -a /usr/* /mnt/new_part
>
> Ack! No! Don't do that!
>
> cp can *not* be trusted to get permissions right, even with the -a
> flag specified, and that wild card will miss dot-files (yes, there
> could be some in /usr; don't make presumptions just because you
> don't do that).
>
> The *right* way to do this is this:
>
>   # cd /usr
>   # tar cfp - . | ( cd /mnt/new_part ; tar xpf - )

If I want to save a copy (as you suggest later on), why do the tar this way,
instead of tarring to a file? And then untarring the file? I realize this
saves a step, but at the expense of security, doesn't it?

> cp's man page may claim it'll do this right, but it's wrong, wrong,
> wrong on every system I've stress tested it (Slowlaris, BSD, and
> yes, god forbid, Linux).
>
> tar'ing up an extra copy of your old /usr and stashing it on /
> somewhere till you're sure everything's there wouldn't be a bad
> idea.

Well, that's why I was just going to rename /usr to /old_usr - to keep a
copy around.

> > This will copy all files (and directories) under /usr, preserving
> > permissions, ownership, and symlinks. Then umount the new partition.
> > Change fstab to point the new partition to /usr, move /usr out of the
way,
> > and mount the new partition to /usr. That should be it.. you shouldn't
have
> > reboot for this :)
>
> A mount -a should suffice for mounting the new partition at /usr,
> and you *definitely* don't need to reboot (why would you ever do
> that except on a laptop? ;^>).
>
>        ~ g r @ eclipsed.net
>
>
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