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

[Michael R. Lawrence CISSP]

 GNU tar can't be told to --empty-file /var/cache/swap/swap1

ADDING THE LIVE RUINING FILE WILL CRASH TAR/SYSTEM 

A: Exclude the file , yet add an as empty...  as the boot will expect it, it will 0 out on shutdown.. 

in this use case,  BOOT will expect it.. , if one restored.. it will overwrite as is , just worried over kernel panic if it is gone.. 

also if your sharing a fs dump , --emptyfile ie /etc/shadow , password etc... ie empty other files for security reasons clean PII in some instances.. 

--empty-file /$path/....  nice to have feature... request.. 

but if I may , touch fake-empty file ??? how to append to tar as  /var/cache/swap/swap1

1 down vote favorite

https://help.ubuntu.com/community/BackupYourSystem/TAR tar -cvJf backup.tar.xz --exclude=/backup.tar.xz --one-file-system / I can add Exclude --exclude=/var/cache/swap/swap1...(not excluding the file segfaults the process and or can crash the lil address@hidden) as this is RPI3 , with some custom built packages... anyhow it would be nice to run this as a docker/rkt , for faster compile times... I however would prefer to back up this file as a place-holder (ie 0 bytes or just an empty file...) for compatibility reasons I need the empty file... (it will be replaced on boot with swap data... on boot) , however not sure if on restore it/system would flake out.?? , so hence i'm trying to add it back via script into the archive. 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... , however i can force it via docker/restore script. via touch /var/cache/swap/swap1 , or by stuffing it unmoundted (from RPI3) in my laptop or Sabayon-virtualbox etc... browse and stuff it back in... also a pain in the @####... #!/bin/bash # # backup Gentoo RPi3 64 Necrose99 # # if portage has lots of packages it will bloat the backup. , Swapfile will crash the backup. # can use the script to dump fs also for docker. tar -cvJf /backup.tar.xz --exclude=/var/cache/swap/swap1 --exclude=/usr/portage/* --exclude=/backup.tar.xz --one-file-system / ## TO DO , find a way to tuck the swap1 file back.. into archive...

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On Fri, Jun 2, 2017 at 3:57 PM, Sergey Poznyakoff <address@hidden> wrote:

Michael R. Lawrence CISSP < address@hidden> ha escrit:

> https://superuser.com/questions/1214855/linux-backup-include-empty-swapfile
>
> tar -cvJf backup.tar.xz --exclude=/backup.tar.xz --one-file-system /
>
> --emptyfile /var/swapfile   alias EXCLUDE , touch > filename > /var/swapfile
>  @ tar.xz (etc)
>
> touching the the swap file crashes tar...  , however a empty placeholder
> wanted root owned... , as it needs to be , as its were RPI-3 adds swap ram.

Could you take the trouble to explain what did you mean?  With all due
respect, this seems completely undecipherable to me.

Regards,
Sergey