On Mon, Feb 16, 2015 at 6:10 PM, Richard W.M. Jones <[email protected]> wrote:
> On Mon, Feb 16, 2015 at 06:00:06PM -0500, Leonard Basuino wrote: > > Hope someone can point me in the right direction. I don't know if what I > > am trying to do should work or not. > > > > I have 2 disk images. One is a VM with an ext2 boot filesystem and ext4 > > filesystems with the OS loaded. I am amble to guestmount this with no > > issue and am able to see the files that are on the ext2 file system. > > > > I can also run guestfish on the image, mount the ext2 filesystem, and > list > > the files. > > > > However, the second image I have is only a boot disk image with just an > > ext2 filesystem. > > > > guestmount complains that there is no OS and won't mount. > > What you really need to do is run: > > virt-filesystems -a second-disk.img --all --long -h > > which will tell you what filesystems (etc) are available in the second > image. > > The only filesystem is /dev/sda1 of type ext2 > > guestfish complains "...wrong fs type, bad option, bad superblock...". > > Try using guestfish -v -x flags to provide extra information about > this error. See: > > http://libguestfs.org/guestfs-faq.1.html#debug > I get the following debug info: mount -o /dev/sda1 / [ <time> ] EXT4-fs (sda1): mounting ext2 file system using the ext4 subsystem [ <time> ] EXT4-fs (sda1): bad geometry: block count 104388 exceeds size of device (103408 blocks) mount: wrong fs type, bad option, bad superblock on /dev/sda1 .... also, trying to mount the image with: mount -t ext2 <image> <mount point> returns: mount: wrong fs type, bad option, bad superblock on /dev/loop0 ... the end of dmesg has: [<time>] EXT4-fs (loop0): VFS: Can't find ext4 filesystem This has me wondering because the debug messages from guestfish -v -x indicate it is mouting ext2 with ext4. EXT4-fs (sdb): mounting ext2 filesystem using the ext4 subsystem So is the problem that there is no ext4 filesystem in the image and RHEL 7 is having issues with it? > Also, what version of libguestfs and where did you get it from? > > version 1.22.6-22, came with RHEL 7 > > Should I be able to mount a boot disk image with guestmount? > > Yes, libguestfs aims to be able to access any disk image, and mostly > we have achieved that. Whether it is bootable or not wouldn't > normally matter. > > > I suspect I'll have to use the -m (mount) option and not -i (as I did for > > the image with an OS), but that failed too even though I passed in the fs > > type of ext2, > > `-i' invokes inspection: > > http://libguestfs.org/guestfs.3.html#inspection > > Inspection is an optional convenience feature, and you can access disk > images without it, but then you need to know what filesystems you want > to mount (eg. using 'virt-filesystems' -- see above). > > > Why would I be able to mount, via guestfish, the ext2 in the first image > > (with other filesystems of type ext4) but not the disk image with only an > > ext2 filesystem? > > I've no idea, but for more information you can enable debugging at run > time: > > http://libguestfs.org/guestfs-faq.1.html#debug > > Rich. > > > -- > Richard Jones, Virtualization Group, Red Hat > http://people.redhat.com/~rjones > Read my programming and virtualization blog: http://rwmj.wordpress.com > virt-p2v converts physical machines to virtual machines. Boot with a > live CD or over the network (PXE) and turn machines into KVM guests. > http://libguestfs.org/virt-v2v >
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