Non-interactive multivolume restore

[O'Connor, Daniel]

> On 4 Feb 2019, at 13:59, Warner Losh <imp at bsdimp.com> wrote:
> Multiple -f args? Maybe a printf format to clue restore into how to
> construct the names? Maybe also some pipe command with a similar %
> specification to allow restore from compressed files..

OP says you can only specify -f once.

What about using -P? That can be scripted so you could do something where a script checks a file for the current filename it should cat.

     -P pipecommand
             Use popen(3) to execute the sh(1) script string defined by
             pipecommand as the input for every volume in the backup.  This
             child pipeline's stdout (/dev/fd/1) is redirected to the restore
             input stream, and the environment variable RESTORE_VOLUME is set
             to the current volume number being read.  The pipecommand script
             is started each time a volume is loaded, as if it were a tape
             drive.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
 -- Andrew Tanenbaum