List of commands to mount/unmount a qcow2 image conatining LVM partitions.

mount-qcow2-lvm-image.sh

# kudos to dzaku at consolechars.wordpress.com

### MOUNT qcow2 image with lvm partitions

# ensure nbd can handle that many partitions
sudo modprobe nbd max_part=8

# present image as block device through NBD
sudo qemu-nbd --connect=/dev/nbd0 <image.qcow2>

# check the disk partitions, see if LVM_member is there
sudo fdisk /dev/nbd0 -l

# some time partition devices are not created, use partx for that
sudo partx -a /dev/nbd0

# list devices corresponding to partitions
sudo ls /dev/nbd0*

# refresh PhysVolume cache for this device
sudo pvscan --cache /dev/nbd0p<N>

# find VolGroups
sudo vgscan

# find Volumes, check what is found and their status
sudo lvscan

# activate newly found VolGroups
sudo vgchange -ay

# mount the lvm partition to /mnt
sudo mount /dev/mapper/<lvm-partition> /mnt

### USE the mounted partition, e.g
ls /mnt

### UNMOUNT

# unmount LVM partition
sudo umount /mnt

# deactivate VolGroup
sudo vgchange -an <lv-volume>

# disconnect image from NBD
sudo qemu-nbd -d /dev/nbd0

Thanks!