Add device name and size to shell selection script - bash

Question

I am writing a shell script to install Arch Linux, currently, I have a very basic disk selection but it does not give enough information, how can I add extra information such as the disk name and size but keep the $DISK variable the same (ie: /dev/nvme0n1)
select_disk () {
count=0
for device in `lsblk -d | tail -n+2 | cut -d" " -f1`; do
count=$((count+1))
dev[$count]=$device
printf '%s: %s\n' "$count" "$device"
done
read -rp "Select disk (numbers 1-$count): " selection
DISK="/dev/${dev[$selection]}"
echo "$DISK" > /tmp/disk
echo "Installing on $DISK."
}

Answer 1

You could use the columns format lsblk offers using the -o flag. Also, you can avoid the tail (which I believe is to remove the header) by using the lsblk flag -n which does exactly that. Something like this:
select_disk () {
count=0
# by default the 'for' loop splits by spaces, change that
# to split by breaklines by redefining IFS
IFS=$'\n'
for device_info in `lsblk -d -n -o NAME,TYPE,SIZE`; do
count=$((count+1))
device_name=$(echo $device_info | cut -d" " -f1)
dev[$count]=$device_name
printf '%s: %s\n' "$count" "$device_info"
done
read -rp "Select disk (numbers 1-$count): " selection
DISK="/dev/${dev[$selection]}"
echo "$DISK" > /tmp/disk
echo "Installing on $DISK."
}
Here is only showed the NAME, TYPE and SIZE, but you can add all the columns you want (separated by a comma). See lsblk -h (the help) for all possible options.

Answer 2

I'm not sure about what you are calling 'disk name' but...
Let's consider, in your 'for;do..done' loop, that $device is your mapped device name (i.e: sda).
You may get the following information:
1)The device label (if exist):
lsblk "/dev/${device}" -dn -o LABEL
2)The device vendor:
lsblk "/dev/${device}" -dn -o VENDOR
3)The device size (in human readable format)
lsblk "/dev/${device}" -dn -o SIZE
and multiple other informations like:
4)device type:
lsblk "/dev/${device}" -dn -o TYPE
5)Hardware block sizes
lsblk "/dev/${device}" -dn -o PHY-SEC,LOG-SEC
6)Linux owners and group assigned to this object
lsblk "/dev/${device}" -dn -o OWNER,GROUP
Or anything in the below list:
NAME KNAME MAJ:MIN FSTYPE MOUNTPOINT LABEL UUID PARTTYPE PARTLABEL PARTUUID PARTFLAGS RA RO RM HOTPLUG MODEL SERIAL SIZE STATE OWNER GROUP MODE ALIGNMENT MIN-IO OPT-IO PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE TYPE DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO WSAME WWN RAND PKNAME HCTL TRAN SUBSYSTEMS REV VENDOR ZONED
hope it helps.