Re: [Bug-tar] linux-backup-include-empty-swapfile (embedded)

[Michael R. Lawrence CISSP]

hmm  may have to give that a go, as raspberry-pi3 isnt all that beefy ,

 /var/cache/swap/swap1 --exclude ... , and touch /tmp/fake-swap1 ,
--transform to /var/cache/swap/swap1

however --emptyfile , would be in the future a very elegant , and
simplified  user alias...

also for password files or other things one might want blanked...  ie
custom iso re-spins... etc...  and remove P. I .  etc. ​

​i'll have to adjust my script but , this for now should do...  ​





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On Tue, Jun 6, 2017 at 5:07 AM, Pavel Raiskup <prais...@redhat.com> wrote:

> On Saturday, June 3, 2017 5:40:31 AM CEST Michael R. Lawrence CISSP wrote:
> > GNU tar can't be told to --empty-file* /var/cache/swap/swap1*
>
> Ah, RFE for --empty-file.  That sounds like valid request to me.
>
> > ADDING THE LIVE RUINING FILE WILL CRASH TAR/SYSTEM
>
> Hm, tar shouldn't crash if some file is changed in parallel (that would be
> clear
> bug and reproducer would be needed).  Documentation claims that you should
> avoid
> such race conditions if you want to have _valid_ backup though.
>
> > I'm just not sure how to get tar to add the 1 file as empty... or append
> > archive as 1 empty file @ path...
> >
> > *How to append the empty file in my backup script would be a a plus* ,
> more
> > elegant...
>
> Have a look at '--transform' option:
>
>     $ tar --transform='s|/tmp/empty-file|/swp/file|' \
>           /tmp/empty-file \
>     ...
>
> That's definitely not an elegant way.  Also: I would be careful to use
> --transform with --exclude, to my understanding --exclude should be applied
> against _transformed_ name (but it doesn't happen ATM).
>
> Pavel
>
>