Problems restoring hard-linked files

[Jamie Landeg-Jones <jamie@dyslexicfish.net>]

I tried to restore a file recently, but it failed, as it turned out that it
was hardlinked to another file. To retrieve it, I had to know which file it
was linked to, and restore that too.

The 'root' file isn't even necesarily the first alphabetically - just the one
tarsnap backs up first.

Is this a known issue? If it's difficult to get tarsnap to restore the file
automatically, I'd at least expect a more informative error message like
"Unable to restore hard linked file, unless you also restore file xxxxx",
or similar.

A transcript demonstrating this follows.

Cheers!

Jamie

 | 23:05 (1) "/tmp" root@lapcat# tarsnap -xvf lapcat.20150808.0622.tar bin/tcsh
 | x bin/tcsh: Can't create 'bin/tcsh'
 | tarsnap: Error exit delayed from previous errors.
 |
 | *1* 23:08 (2) "/tmp" root@lapcat# l -i bin
 | total 4
 | 5   0 drwxr-xr-x  2 root  wheel  -   0 16 Aug 23:06 ./
 | 2   4 drwxrwxrwt  3 root  wheel  - 192 16 Aug 23:06 ../
 |
 | 23:09 (3) "/tmp" root@lapcat# xzcat /var/log/tarsnap/verbose-log.20150808.0622.xz | grep 'bin/.*csh'
 | -r-xr-xr-x  0 root       wheel      382360 Jul 13 01:11 bin/csh
 | hr-xr-xr-x  0 root       wheel           0 Jul 13 01:11 bin/tcsh link to bin/csh
 | -r-xr-xr-x  0 root       wheel      378952 Oct  2  2014 bin/tcsh-my-patch
 |
 | 23:09 (4) "/tmp" root@lapcat# tarsnap -xvf lapcat.20150808.0622.tar bin/csh
 | x bin/csh
 |
 | 23:10 (5) "/tmp" root@lapcat# l -i bin
 | total 384
 | 5   4 drwxr-xr-x  2 root  wheel  -     64 16 Aug 23:09 ./
 | 2   4 drwxrwxrwt  3 root  wheel  -    192 16 Aug 23:06 ../
 | 6 376 -r-xr-xr-x  1 root  wheel  - 382360 13 Jul 01:11 csh
 |
 | 23:10 (6) "/tmp" root@lapcat# tarsnap -xvf lapcat.20150808.0622.tar bin/tcsh
 | x bin/tcsh
 |
 | 23:11 (7) "/tmp" root@lapcat# l -i bin
 | total 760
 | 5   4 drwxr-xr-x  2 root  wheel  -    128 16 Aug 23:11 ./
 | 2   4 drwxrwxrwt  3 root  wheel  -    192 16 Aug 23:06 ../
 | 6 376 -r-xr-xr-x  2 root  wheel  - 382360 13 Jul 01:11 csh
 | 6 376 -r-xr-xr-x  2 root  wheel  - 382360 13 Jul 01:11 tcsh
 |
 | 23:11 (8) "/tmp" root@lapcat# rm -r bin
 |
 | 23:11 (9) "/tmp" root@lapcat# tarsnap -xvf lapcat.20150808.0622.tar bin/tcsh bin/csh
 | x bin/csh
 | x bin/tcsh
 |
 | 23:12 (10) "/tmp" root@lapcat# l -i bin
 | total 760
 | 5   4 drwxr-xr-x  2 root  wheel  -    128 16 Aug 23:12 ./
 | 2   4 drwxrwxrwt  3 root  wheel  -    192 16 Aug 23:11 ../
 | 6 376 -r-xr-xr-x  2 root  wheel  - 382360 13 Jul 01:11 csh
 | 6 376 -r-xr-xr-x  2 root  wheel  - 382360 13 Jul 01:11 tcsh
 |
 | 23:13 (11) "/tmp" root@lapcat# xzcat /var/log/tarsnap/backup.20150808.0622.xz | grep '+ tarsnap'
 | 06:22:03 | + tarsnap --one-file-system --nodump --disk-pause 5 --check-links --print-stats --humanize-numbers --checkpoint-bytes=536870912 --exclude /var/db/tarsnap/ --exclude /.snap/ --exclude /var/.snap/ --exclude /usr/.snap/ --exclude /test/.snap/ -cvf lapcat.20150808.0622.tar /usr/users/jamie/ /usr/src/sys/amd64/conf/ /var/ /usr/me/ / /usr/local/arpwatch/ /usr/local/etc/ /usr/local/openssl/ /usr/local/ossec-hids/ /usr/local/var/