[TUHS] Extracting files from various old dump/restore tapes

Warner Losh imp at bsdimp.com
Tue Aug 23 02:56:09 AEST 2022

On Mon, Aug 22, 2022 at 10:53 AM Bakul Shah <bakul at iitbombay.org> wrote:

> On Aug 22, 2022, at 9:27 AM, Warner Losh <imp at bsdimp.com> wrote:
> >
> > FreeBSD deleted some compat code in the kernel some time ago, and it
> turns
> > out that restore used that to read old dump tapes, so we broke old dump
> tapes.
> > So you can't use FreeBSD's unmodified.
> May be run an older release that has this code?

That only works if the dinode structures line up exactly to whatever these
are from. The 16-bit ones likely need to use the V7 restore (maybe running
emulation in simh), the 32-bit ones might be able to use V32 or 4BSD
running in
emulation, if that's what the tapes are from. But the multi-endian
suggests  that
maybe things are more complex than that.

FreeBSD's restore from older releases might work, but only for the 32-bit
stuff and
only if we're lucky...

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