mjhjmtu

If I know that a partition is for example /dev/sda1 how can I get the disk name (/dev/sda in this case) that contains the partition ?

• The output should be only a path to disk (like /dev/sda).


• It shouldn't require string manipulation, because I need it to work for different disk types.

You can observe in /sys the block device for a given partition name. For example, /dev/sda1:

$ ls -l /sys/class/block/sda1
lrwxrwxrwx 1 root root /sys/class/block/sda1 -> 
 ../../devices/pci0000:00/.../ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1

A script to take arg /dev/sda1 and print /dev/sda is:

part=$1
part=$part#/dev/
disk=$(readlink /sys/class/block/$part)
disk=$disk%/*
disk=/dev/$disk##*/
echo $disk

I don't have lvm etc to try out, but there is probably some similar path.

There is also lsblk:

$ lsblk -as /dev/sde1
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sde1 8:65 1 7.4G 0 part 
`-sde 8:64 1 7.4G 0 disk 

and as @don_crissti said you can get the parent directly with:

lsblk -no pkname /dev/sda1

Perhaps not beautiful:

for d in `fdisk -l 2>/dev/null | grep "^Disk " | cut -d":" -f1 | cut -f2`
do
 if [ `fdisk -l $d 2>/dev/null | grep -c "/dev/sda1"` -gt 0 ]
 then
 echo On disk $d
 fi
done

It works only for 'real' disks not for LVM.

It's work only with UTF-8 locale. lvm, zfs tested ok.

parent_tree_disk() awk '/^[A-Za-z]/d0=$1; print d0;/^[└─├─]/d1=$1; print d0, d1;/^ [└─├─]/d2=$1; print d0, d1, d2' 

alias pd='parent_tree_disk'

shell command:# pd
NAME

sda

sda sda1

sda sda2

sda sda2 cl-root

sda sda2 cl-swap

shell command:# pd | awk '/sda2/print $1'

sda

And you can use other filter on pd list output, like sort, uniq...