cleaning up loop mounted volume groups

gistfile1.txt

create_vg() {
        # loopback file for PV:                                                                                        
        pvfile=$LXD_DIR/lvm-pv.img
        fallocate -l 1GB $pvfile
        pvloopdev=$(losetup -f)
        losetup $pvloopdev $pvfile

        #vgcreate will create a PV for us                                                                              
        vgcreate lxd_test_vg $pvloopdev

        trap cleanup_vg EXIT
}

cleanup_vg() {
        # -f removes any LVs in the VG                                                                                 
        vgremove -f lxd_test_vg
        losetup -d $pvloopdev
        rm $pvfile
}