Date: Mon, 25 Jul 2011 17:52:19 -0700 (PDT) From: Joe Sciulli <jsciulli2003@yahoo.com> To: freebsd-emulation@freebsd.org Subject: Re: mount vdi on host Message-ID: <1311641539.51211.YahooMailClassic@web122305.mail.ne1.yahoo.com> In-Reply-To: <CALBk6yJrHniVi8RoTGwLtqWF1nL1r8JZLKbS1mcLMw1DnxeofQ@mail.gmail.com>
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--- On Mon, 7/25/11, Brandon Gooch <jamesbrandongooch@gmail.com> wrote: From: Brandon Gooch <jamesbrandongooch@gmail.com> Subject: Re: mount vdi To: "Andrey V. Elsukov" <bu7cher@yandex.ru> Cc: "Joe Sciulli" <jsciulli2003@yahoo.com>, freebsd-emulation@freebsd.org, = nox@jelal.kn-bremen.de Date: Monday, July 25, 2011, 4:31 PM 2011/7/25 Andrey V. Elsukov <bu7cher@yandex.ru>: > On 25.07.2011 10:18, Joe Sciulli wrote: >> Is it possible to mount virtualbox vdi file on the FreeBSD host? =A0This= appears to be doable on >> windows and linux hosts, which basically is done in two steps: 1. find o= ffset in the image. 2. >> mount the image with that offset. >> >> I'm trying to do the same thing on FreeBSD, and found the undocumented a= nd deprecated command >> still works: >> >> VBoxManage internalcommands dumphdinfo freebsd_home.vdi >> >> I got the following for the virtual disk image holding the /home (no roo= t hence no MBR) disk for >> a FreeBSD guest: >> >> Header: offBlocks=3D4096 offData=3D28672 >> >> Then attempt to mount it: >> >> mdconfig -a -t vnode -f /tmp/freebsd_home_56.vdi -u 0=20 mount /dev/md0 /tmp/aaa/=20 mount -t cd9660 /dev/md0 /tmp/aaa/ >> >> unfortunately both the above two mount commands failed with "Invalid arg= ument". =A0I tried >> skip=3D28672 to no avail as well. =A0Anything did I do wrong? > > I have not any Vbox images with fixed size, but i tried this: > # mdconfig -f 10G_GPT_UFS.vdi > # gnop create -v -o 41472 /dev/md0 > > where 41472 is offData value. After that md0.nop was tasted and reports a= bout invalid GPT. > So, i think if your image is fixed size disk yout can try this method and= mount UFS (not cd9660). > > -- > WBR, Andrey V. Elsukov There was a CFT sent out a while back about a fuse module for mounting vdi images: http://lists.freebsd.org/pipermail/freebsd-emulation/2010-September/007964.= html Not sure about the state of this now though... -Brandon =0A Thanks for your replies.=A0=20 I tried=20 mdconfig -f freebsd_home.vdi gnop create -v -o 28672 /dev/md0 Indeed /dev/md0.nop etc were created.=A0 But mounting with the following co= mmands still yielded the dreaded "Invalid argument" error: mount /dev/md0.nop /tmp/aaa/=20 =0Amount -t ufs /dev/md0.nop /tmp/aaa/ One thing interesting is, in the gnop command, if I change 28672 to anythin= g else such as 28671 or 28673 or whatever, that gnop command would fail wit= h: gnop: Invalid offset for provider md0. so that suggests the offset is correct.=A0 It's just that how to mount it. The vdi is a variable size disk in virtualbox.=A0 But I had shutdown virtua= lbox and copied it to another file before mdconfig on it.=A0=20 I looked closer at virtualbox-ose-fuse.shar Brandon linked, it appears to b= e hardcoded to work with VirtualBox-3.2.8-OSE, while I only have VBoxGuestA= dditions_4.0.12 as in the ports tree. Any more idea, thanks.
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