diff --git a/lib/common-functions b/lib/common-functions
index b81d60398..152a48718 100644
--- a/lib/common-functions
+++ b/lib/common-functions
@@ -124,57 +124,6 @@ function eval_run_d () {
     trap - ERR
 }
 
-# Usage: map_nbd $image
-# Returns nbd device path
-function map_nbd {
-    (lsmod | grep '^nbd ' >/dev/null) || sudo modprobe nbd max_part=16
-
-    if [[ $(qemu-nbd --help | grep cache) == *writeback* ]] ; then
-        CACHE="--cache=writeback"
-    else
-        echo "Warning: qemu-nbd without --cache=writeback is /slow/."
-        CACHE=""
-    fi
-    NBD_DEV=
-    for i in `seq 0 15`; do
-        if [ ! -e /sys/block/nbd$i/pid ]; then
-            NBD_DEV=/dev/nbd$i
-            # Connect to nbd and wait till it is ready
-            sudo qemu-nbd -c $NBD_DEV $CACHE $1
-            if ! timeout 60 sh -c "while ! [ -e /sys/block/nbd$i/pid ]; do sleep 1; done"; then
-                echo "Couldn't connect $NBD_DEV"
-                exit 1
-            fi
-            break
-        fi
-    done
-    if [ -z "$NBD_DEV" ]; then
-        echo "No free NBD slots"
-        exit 1
-    fi
-}
-
-# Delete and unmount the working dir used in extracting kernel/initrd
-function unmount_qcow_image () {
-    sudo umount $WORK_DIR || true
-    sudo qemu-nbd -d $NBD_DEV >/dev/null || true
-    sudo rm -rf $WORK_DIR
-
-    trap - SIGHUP SIGINT SIGTERM EXIT
-}
-
-function mount_qcow_image() {
-    trap unmount_qcow_image SIGHUP SIGINT SIGTERM EXIT
-
-    WORK_DIR=$(mktemp -d)
-    map_nbd $1
-    if [ -e "${NBD_DEV}p1" ]; then
-       sudo mount ${NBD_DEV}p1 $WORK_DIR
-    else
-       sudo mount ${NBD_DEV} $WORK_DIR
-    fi
-}
-
 function cleanup_build_dir () {
     if ! timeout 5  sh -c " while ! sudo rm -rf $TMP_BUILD_DIR/built; do sleep 1; done"; then
         echo "ERROR: unable to cleanly remove $TMP_BUILD_DIR/built"
diff --git a/lib/img-functions b/lib/img-functions
index 908123ce9..beb3ac88b 100644
--- a/lib/img-functions
+++ b/lib/img-functions
@@ -52,21 +52,6 @@ function cleanup () {
     cleanup_image_dir
 }
 
-function ensure_nbd () {
-    NBD=`which qemu-nbd` || true
-    if [ -z "$NBD" ]; then
-        echo "qemu-nbd is not found in your PATH"
-        echo "Please install it on your system"
-        exit 1
-    fi
-    # prep nbd for mounting
-    (lsmod | grep '^nbd ' >/dev/null) || sudo modprobe nbd max_part=16
-}
-
-function ensure_sudo () {
-    sudo echo "Ensuring sudo is available"
-}
-
 # Helper function to run a command inside the chroot
 function run_in_target () {
     cmd="$@"