Re: [B2-devel] support for libvhd

[Alexei S. <ale...@gm...>]

I've committed your Basilisk changes with some minor (mostly
formatting) changes. Thanks!

The sheepshaver.diff file you sent is the one for the bincue stuff,
can you send the right one for vhd?

-Alexei

On Thu, Oct 7, 2010 at 10:17 AM, Geoffrey Brown <geo...@in...> wrote:
> For my work on digital preservation it's important to have "golden"
> disk images that are not
> corrupted by user action.  In order to enable this, I've added support
> for VHD virtual disks (especially snapshots !)
> to the Linux and OS X versions of BasiliskII and SheepShaver.  The support uses
> the open source libvhd library which is part of xen (available here
> (http://www.xen.org/products/xen_source.html))
>
> The piece that's needed is libvhd which is in tools/blktap2 and it can
> be separately compiled.
> The vhd-util enables creation of vhd disks and snapshots.
>
> Compiling libvhd for OS X is non-trivial and required  1) a new config
> and 2) a number of small changes
> to the include files and c files.  Compiling for linux is a snap.
>
> I use this as follows.
>
> 1) create my "golden image"  gold.dsk in the usual way
> 2) create a snapshot:  vhd-util snapshot -n gold.vhd -p gold.dsk -m
> 3) use the snapshot in my prefs file
>
> In my work the golden images are in an AFS system which means the golden images
> can reside at "universal" addresses.   The snapshots are initially
> tiny, so a complete
> virtual machine configuration -- prefs + snapshot is quick to download
> for the end user.
> The snapshots are copy on write which has the pleasant side effect of
> letting the end user
> keep any changes.
>
> I've attached my diffs and files.  One change to
> SheepShaver/src/Unix/main_unix.cpp is there just
> to work around a bug in the Linux implementation -- on my system mmap
> with MAP_FIXED causes
> a seg fault.
>
> Geoffrey
>
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