osso-docktool 1.9.3

Automation

/etc/udev/rules.d/10-osso-docktool.rules:

# Match the block device but not the partitions.
KERNEL=="sd[a-z]", SUBSYSTEM=="block", ACTION=="add", ENV{SYSTEMD_WANTS}+="osso-docktool@%k.service", TAG+="systemd"

/etc/systemd/system/osso-docktool@.service:

[Unit]
Description=Notify osso-docktool about disk %i
StopWhenUnneeded=yes

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/local/bin/osso-docktool auto-notify --add /dev/%i
ExecStop=/usr/local/bin/osso-docktool auto-notify --remove /dev/%i

When a disk is inserted this will start the osso-docktool@<disk>.service which will notify the osso-docktool auto process. The service is needed because udev starts RUN commands in a restricted container without network access and the systemd process is started outside the restricted container.

When the disk is removed systemd will stop the osso-docktool@<disk>.service.

There are several auto commands Beware that both erase commands will erase all inserted disks that do not match the ignore list without confirmation!

EMAIL=me@example.com osso-docktool auto

By default this uses a tmux session to spawn osso-docktool commands but there is a -g|–gui toggle to switch to a graphical terminal. You can change the default graphical terminal with the command:

update-alternatives --config x-terminal-emulator

Other tools

/usr/local/bin/run-zero-disk (0700):

#!/bin/bash

path=$1
if test -z $path; then
    echo "please supply path as argument"
    exit 1
fi
output=$(dd if=/dev/zero \
   of=$path \
   bs=32M \
   conv=fsync 2>&1)
ret=$?

# Checking output as DD does not exit clean even if whole disk is wiped

if [[ $ret -eq 0 ]]; then
    exit 0
else
    if [[ $output == *'No space left on device'* ]]; then
        echo "Disk $path has been zeroed"
        exit 0
    else
        echo "Something went wrong while writing to $path"
        echo $output
        exit 1
    fi
fi

Compile lessrandom.c and move lessrandom to /usr/local/bin/lessrandom (0700):

lessrandom.c:

#include <stdio.h>
#include <time.h>
#define BUF 4096
int main() {
    FILE *f;
    char buf[BUF];
    f = fopen("/dev/urandom", "rb");
    while (1) {
        if (fread(buf, 1, BUF, f) == BUF) {
            int i;
            for (i = 0; i <= buf[0]; ++i) {
                fwrite(buf, 1, BUF - 1, stdout);
            }
        }
    }
    fclose(f);
    return 0;
}


gcc -Wall lessrandom.c -o lessrandom

/usr/local/bin/run-lessrandom (0700):

#!/bin/bash

path=$1
if test -z $path; then
    echo "please supply path as argument"
    exit 1
fi
output=$(dd if=<(/usr/local/bin/lessrandom) \
   of=$path \
   bs=32M \
   conv=fsync 2>&1)
ret=$?

# Checking output as DD does not exit clean even if whole disk is wiped

if [[ $ret -eq 0 ]]; then
    exit 0
else
    if [[ $output == *'No space left on device'* ]]; then
        echo "Disk $path has been wiped"
        exit 0
    else
        echo "Something went wrong while writing to $path"
        echo $output
        exit 1
    fi
fi