Auto copy from SD to DVD

lonesoac0 · 01-22-2015, 10:21 AM

Hello all,

I was wondering if there was a way to automatically copy files from an SD card to a DVD burner. I would prefer a differential copy as well.

Any ideas?

joe_2000 · 01-22-2015, 11:47 AM

Sure.

You want to look at udev rules. You could create a rule that runs a script once you insert your sd card.

The script could then burn the DVD.

You need to put a sript into /etc/udev/rules.d/ and give it a name that starts with a low number and ends with .rules. E.g. 10-autoburn_sd.rules.

It should contain something like

Code:

ATTRS{idVendor}=="1234", ATTRS{idProduct}=="5678", RUN+="/usr/local/bin/burn_sd.sh"

Instead of 1234 you have to put the vendor id of your sd card and instead of 5678 the product id. Both of which you can find out by running

Code:

lusb

You should get something like

Code:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 13d3:5071 IMC Networks 
Bus 004 Device 003: ID 1241:1111 Belkin Mouse
Bus 001 Device 004: ID 058f:6335 Alcor Micro Corp. SD/MMC Card Reader

Where the last line would be the sd card. So instead of 1234 you'd put 058f and instead of 5678 you'd put 6335

Then the script /usr/local/bin/burn_sd.sh should look similar to this:

Code:

#!/bin/bash
BURNDIR=/path/to/sdcard
genisoimage -r $BURNDIR | wodim -v speed=16 dev=/dev/sr0 -

Depending on your system you may also have to include a line at the beginning that actually mounts the sdcard.

Replace the /path/to/sdcard with the right path.

And last not least for the script to run make sure it is executable and that you have the packages genisoimage and wodim installed.

All of this untested so I am sure it'll need a little tweaking (Make sure the sdcard is actually mounted, handle situations like no dvd in drive, etc...), but I guess you get the picture.
Also I am not exactly sure what you mean by differential copy.

michaelk · 01-22-2015, 01:49 PM

In addition, what type of media are you wanting to use, DVD-R or DVD-RW? Since you mention differential copy I assume you are wanting to use the same disk multiple times. rsync will work since you can use the dry run feature to get a list of files to be copied.

You will need temporary storage space worst case double the size of the SD card, whatever is required to save the files to be written and then space to create the actual file to be burned. You will need to test to make sure you have sufficient space left on the disk to burn the new data.

Another method is packet writing whereby the DVD-RW looks like a regular disk. At bit more complicated to set up. Been many years since I've played with packet writing...

veerain · 01-24-2015, 06:58 PM

I think a daemon should be used for auto burning via udev. The run command of udev has a low timeout value.

joe_2000 · 01-25-2015, 04:35 AM

Quote:

Originally Posted by veerain

I think a daemon should be used for auto burning via udev. The run command of udev has a low timeout value.

What do you mean by timeout? That it will interrupt running processes? Because I think waiting for the card to be mounted should not be a problem.
The script could immediately start with something like (untested)

Code:

#!/bin/bash
UUID_OF_SD_CARD=<uuid of sd card goes here>
MAX_RETRY_COUNT=10
mkdir -p /mnt/$UUID_OF_SD_CARD
while [ ! -e /dev/disk/by-uuid/$UUID_OF_SD_CARD ]; do
        mount /dev/disk/by-uuid/$UUID_OF_SD_CARD /mnt/$UUID_OF_SD_CARD && break;
        MAX_RETRY_COUNT=$[ $MAX_RETRY_COUNT - 1 ];
        if [ $MAX_RETRY_COUNT -lt 0 ];then
                break;
        fi     
        echo "Mount failed. Try again in 1 sec"
        sleep 1
done