Re: [Bug-tar] --listed-incremental issues

[Sergey Poznyakoff]

ashley willis <address@hidden> ha escrit:

> the original command without --listed-incremental works:
> 
> # cd "/mnt" && find . -depth -xdev ! -type s -print0 | tar --create --null \
>   --files-from=- --ignore-failed-read --same-permissions --no-recursion \
>   --totals --level=0 --verbose --sparse -b 20 --file /mnt/flexbackup/mnt.0.tar

It would add each non-directory member to the archive twice. Was that
intended?

> # cd "/mnt" && find . -depth -xdev ! -type s -print0 | tar --create --null
>   --files-from=- --ignore-failed-read --same-permissions --no-recursion \
>   --totals --listed-incremental=/mnt/flexbackup/mnt.0.snapshot --level=0 \
>   --verbose --sparse -b 20 --file /mnt/flexbackup/mnt.0.tar

That's even more risky: incremental backups work by comparing directory
contents and metadata with the information stored on a previous run.
It is not a good idea to give individual files as arguments to tar in
incremental mode.

To avoid archiving sockets, I'd suggest creating an exclude list
instead. E.g:

find . -depth -xdev -type s |
 tar -C /mnt \
     --create --null \
     --files-from=- --ignore-failed-read --same-permissions --no-recursion \
     --totals --listed-incremental=/mnt/flexbackup/mnt.0.snapshot --level=0 \
     --verbose --sparse -b 20 --file /mnt/flexbackup/mnt.0.tar \
     --exclude-from - .

Regards,
Sergey