Overview: autoshred
Shred wrapper script that will allow you to plug in external drives and automatically wipe the data. While shooting, smashing, and drilling harddrives is cool and fun, why not repurpose the drives?
Usage
Installation
sudo apt update
sudo apt install -y git coreutils vim screen
git clone https://github.com/pgporada/autoshred && cd autoshred
mv autoshred.example.conf autoshred.conf
lsblk
# Configure your exclusion list to drives that should not be wiped
vim autoshred.conf
Starting the program on boot
sudo crontab -e
@reboot /usr/bin/screen -d -m /home/pi/autoshred/autoshred.sh -f
Displays some help
./autoshred -h
Destroy data
sudo ./autoshred -f
Verifying that autoshred is running
screen -ls
ps aux | grep shred
Development/Testing
The average user shouldn't need to worry about this section. This will take you through the process of creating a vagrant and a garbage volume to test the script out
vagrant up
vagrant ssh
Create a volume, mount it, and destroy it
vagrant@ubuntu-xenial:/vagrant$ sudo dd if=/dev/zero of=MyDrive.img bs=1M count=500
500+0 records in
500+0 records out
524288000 bytes (524 MB, 500 MiB) copied, 2.90638 s, 180 MB/s
vagrant@ubuntu-xenial:/vagrant$ sudo fdisk MyDrive.img
Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table.
Created a new DOS disklabel with disk identifier 0x5cb4896a.
Command (m for help): p
Disk MyDrive.img: 500 MiB, 524288000 bytes, 1024000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x5cb4896a
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-1023999, default 2048):
Last sector, +sectors or +size{K,M,G,T,P} (2048-1023999, default 1023999):
Created a new partition 1 of type 'Linux' and of size 499 MiB.
Command (m for help): w
The partition table has been altered.
Syncing disks.
vagrant@ubuntu-xenial:/vagrant$ sudo mkfs -t ext4 MyDrive.img
mke2fs 1.42.13 (17-May-2015)
Found a dos partition table in MyDrive.img
Proceed anyway? (y,n) y
Creating filesystem with 512000 1k blocks and 128016 inodes
Filesystem UUID: 48ea4ef2-6393-46e4-b35b-ddf06b27e6a4
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
vagrant@ubuntu-xenial:/vagrant$ sudo mount -t ext4 MyDrive.img /media/test/
vagrant@ubuntu-xenial:/vagrant$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 10G 0 disk
└─sda1 8:1 0 10G 0 part /
sdb 8:16 0 10M 0 disk
loop0 7:0 0 500M 0 loop /media/test
Thanks
Thank you for using my software! If you find my code useful to you or your organization, please consider donating some beer money to me via the PayPal badge above.
Thanks to http://www.retrojunkie.com/asciiart/cartchar/turtles.htm for the Shredder ascii art.
(C) Phil Porada