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Re: copy directory tree, mapping to new owners

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On 14/09/21 6:50 pm, tomas@tuxteam.de wrote:
> On Tue, Sep 14, 2021 at 12:17:05PM +1200, Richard Hector wrote:
>> On 13/09/21 7:04 pm, tomas@tuxteam.de wrote:
>> >On Mon, Sep 13, 2021 at 11:45:02AM +1200, Richard Hector wrote:
>> >>On 12/09/21 6:52 pm, john doe wrote:
>> >
>> >[...]
>> >
>> >>>If you are doing this in a script, I would use a temporary directory.
>> >>>That way, in case of failure the destination directory is not rongly
>> >>>modified.
>> >>>
>> >>>EG:
>> >>>
>> >>>$ rsync <src-dir> <tmp-dir>
>> >>>
>> >>>Make <tmp-dir> the way you want it to be.
>> >>>
>> >>>$ rsync <tmp-dir> <dest-dir>
>> >>
>> >>That is true, but firstly it would require more available space [...]
>> >
>> >This isn't necessary, as you could replace the second `rsync' by a `mv'
>> >(provided your temp tree is on the same storage volume as your target
>> >dir, that is).
>> 
>> I was assuming the suggestion was to rsync the source to the temp
>> while the destination still exists, before rsyncing or mv'ing over
>> the top of it. Total of 3 copies (temporarily) rather than 2.
> 
> Then, it's different. But in your scenario you would probably want
> to take down whatever "service" relies on the destination dir while
> the copy is in progress.

This is all academic, since rsync with --usermap and --groupmap does 
what I want, in place.

But john doe's proposal had the rationale of "That way, in case of 
failure the destination directory is not rongly modified."

That implies the destination is staying put. Well, I guess deleting it 
entirely avoids "wrongly modifying" it too :-)

> In any case, if you haven't the space, you haven't it. Sysadmin's
> life ain't always nice :)

It's available if I want it; everything is on LVM. It's easy to grow. 
It's also all on a VPS, so expanding the total is a matter of tweaking 
the settings in a control panel. But it's harder to shrink (especially 
since I use xfs), so I prefer not to grow it if it's not necessary.

Cheers :-)
Richard

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copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-12 02:50 +0200
  Re: copy directory tree, mapping to new owners Greg Wooledge <greg@wooledge.org> - 2021-09-12 03:00 +0200
    Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-12 03:50 +0200
      Re: copy directory tree, mapping to new owners john doe <johndoe65534@mail.com> - 2021-09-12 09:00 +0200
        Re: copy directory tree, mapping to new owners Andrei POPESCU <andreimpopescu@gmail.com> - 2021-09-12 12:30 +0200
        Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-13 01:50 +0200
          Re: copy directory tree, mapping to new owners <tomas@tuxteam.de> - 2021-09-13 09:10 +0200
            Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-14 08:20 +0200
              Re: copy directory tree, mapping to new owners <tomas@tuxteam.de> - 2021-09-14 09:00 +0200
                Re: copy directory tree, mapping to new owners David Wright <deblis@lionunicorn.co.uk> - 2021-09-14 15:50 +0200
                Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-15 01:00 +0200
      Re: copy directory tree, mapping to new owners l0f4r0@tuta.io - 2021-09-12 09:00 +0200
        Re: copy directory tree, mapping to new owners Curt <curty@free.fr> - 2021-09-12 16:30 +0200
          Re: copy directory tree, mapping to new owners l0f4r0@tuta.io - 2021-09-12 18:40 +0200
        Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-13 01:50 +0200
      Re: copy directory tree, mapping to new owners l0f4r0@tuta.io - 2021-09-12 09:20 +0200
  Re: copy directory tree, mapping to new owners Teemu Likonen <tlikonen@iki.fi> - 2021-09-12 09:50 +0200
    Re: copy directory tree, mapping to new owners <tomas@tuxteam.de> - 2021-09-12 10:10 +0200
    Re: copy directory tree, mapping to new owners Richard Hector <richard@walnut.gen.nz> - 2021-09-13 02:10 +0200

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