Re: [gentoo-user] Merging separate /usr back into / - one last time...

[Mick]

On Monday 02 Dec 2013 20:40:28 Tanstaafl wrote:
> On 2013-12-02 2:41 PM, Thanasis <thanasis@××××××××××.org> wrote:

> > That is why I recommend using the option --numeric-ids.
> > And using it would not hurt anyway.
>
> Right... poison pointed this out...
>
> This is why I asked for help about the arguments.
>
> I honestly don't care about superflous/unnecessary arguments, I just
> want to make sure I use at least the ones needed for this to work.
>
> Thanks...

The comment about --numeric-ids that Thanasis made is valid.  I messed up some 
fs of mine last time I used rsync, when I wasn't paying much attention!  I 
made a mental note to always use it in the future.  On the other hand, if 
you're not that comfortable with it, a quick trial run with a test filesystem 
will offer some assurance that your chosen command and options will work as 
you intended.  BTW, you do not *have* to use rsync:

  cp -a

will do the same.

  su -
  cd /old_usr
  tar --one-file-system -cf . | (cd /new_usr ; tar -xvpf - )

will also do the same.

Finally, star -copy is my favourite faster alternative to copying directories, 
inc. respecting any acl's and the like if you specify it in the options:

  su -
  star -copy <options> -C /old_usr . /new_usr

Then you can also add -diff to see if any file was not copied correctly (use 
star diffopts=!<option> to exclude things like ctime, or you'll drown in the 
noise of the output).


Speaking from experience I suggest that you do not blast your old /usr away 
until you have booted with /usr mounted in the new location and have verified 
that ownership and access rights are as you expected.

-- 
Regards,
Mick