Ventto / lsdblk

POSIX Shell script to list the data block devices from a given one

Lsdblk

"List all the data partitions of a given block device"

Requirements

$ apt-get install util-linux    # lsblk

Introduction

The lsblk tool lists all the /dev/sda's block devices (as below) but it cannot extract data ones you would like to clone with a tool like partclone.

$ lsblk -o NAME,FSTYPE /dev/sda
NAME          FSTYPE
sda
├─sda1        vfat
└─sda2        crypto_LUKS
  └─lvm       LVM2_member
     ├─vg-swap  swap
    ├─vg-boot ext4
    ├─vg-root ext4
    └─vg-home ext4

Let's suppose we need to write a script to backup data partitions. It is useful to list and iterate them while leveraging the partclone.[fstype] tool suite:

for blk_info in $(lsdblk /dev/sda); then
    blk_name=$(echo "$blk_info" | cut -d' ' -f1)
    blk_fstype=$(echo "$blk_info" | cut -d' ' -f2)
    [ -z "$blk_fstype" ] && blk_fstype="dd"

    partclone.${blk_fstype} -c -s "$blk_name" | gzip -c -9 > "$blk_name".gz
fi

Usage

• List the /dev/sda's data blocks:

$ lsdblk /dev/sda
/dev/mapper/vg-boot ext4
/dev/mapper/vg-home ext4
/dev/mapper/vg-root ext4
/dev/sda1 vfat

• List the /dev/sda1's data blocks:

$ lsdblk /dev/sda1
/dev/sda1 vfat

• List the /dev/sda2's data blocks:

$ lsdblk /dev/sda2
/dev/mapper/vg-boot ext4
/dev/mapper/vg-home ext4
/dev/mapper/vg-root ext4