"Upgrade" a HFS drive to APFS

hfsToAPFS.sh

#!/bin/bash
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

VOL_NAME="Macintosh HD 10142-190404"
diskutil apfs addVolume disk3 apfs Preboot -role B
VOL_UUID=$(diskutil info disk3s1 | grep "Volume UUID"|awk '{print $(NF)}')
mkdir /Volumes/Preboot/${VOL_UUID}
diskutil mount disk1s2
SRC_UUID=$(diskutil info disk1s1 | grep "Volume UUID"|awk '{print $(NF)}')
sudo rsync -xrlptgoEvHS --progress --delete /Volumes/Preboot\ 1/${SRC_UUID}/ /Volumes/Preboot/${VOL_UUID}
diskutil unmount disk1s2
#diskutil unmount disk3s2
diskutil apfs updatePreboot disk3s1
sudo bless --folder "/Volumes/${VOL_NAME}/System/Library/CoreServices" --bootefi
sudo update_dyld_shared_cache -root /Volumes/"${VOL_NAME}" -force