Help burning CDs?

@[email protected] · 4 months ago

Help burning CDs?

@[email protected] · 4 months ago

Ahhh, so apparently in the man page for cdrecord it mentions it needs to be ran as root since it uses “real time scheduling” to write. So even if you have proper permissions to use the cd burner, you still need root to run it. I made a bad assumption that you were having to use root since you didn’t have permissions as your use to write to it.

If you don’t need to parse the output of “cdrecord -checkdrive” then setting that var is pretty trivial.

CDROM=$(cdrecord -checkdrive)

If that outputs more than just the string you need, that gets a little headachey. Grep/awk/sed/sort/uniq/regex are all very powerful and esoteric.

That being said, the man page also mentions that most users will not have to specify “dev” at all as it should figure it out automatically. So you might be ok with axing the “dev” part of the command instead of feeding it the device path.

@[email protected] · edit-2 4 months ago

AH! Oh well no harm no foul, I can run my script as root, I trust me!

Cdrecord -checkdrive does output a whole mess of stuff:

Device was not specified. Trying to find an appropriate drive...
Detected CD-R drive: /dev/sr0
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : 'Slimtype'
Identification : 'eNAU108   8     '
Revision       : 'XL0A'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE FORCESPEED 
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

And the only part I need is the part that says /dev/sr0/.

I will try deleting the /dev/ part entirely though and see what happens (probably tomorrow evening). If it works that’ll be perfect. Thanks!

Edit: No dice, dev=/dev/sr0 is needed in my case.

@[email protected] · 4 months ago

This is a very goofy workaround for you that doesn’t actually check what the device is. Only checks if /dev/sr0 exists and if yes, use that if no then use /dev/sr1. Better solution below this block. But leaving it because I kind of like it’s jankiness.

if [ -e /dev/sr0]; then
    DEVICE="/dev/sr0"
else
    DEVICE="/dev/sr1"
fi

Not elegant and a little janky but works.

This will work better. We are taking the output of -checkdrive, searching for “Detected” and sending that to awk. We are telling awk to split that line into columns based on this character “:” and to print the second column. That should give you an output of " /dev/sr0" with a space in front.

DEVICE=$(cdrecord -checkdrive | grep Detected | awk -F ":" '{print $2}')

That should work. But if you absolutely must kill the whitespace for some reason we can add trim to the end like so

DEVICE=$(cdrecord -checkdrive | grep Detected | awk -F ":" '{print $2}' | tr -d ' ')

There might be a more elegant solution by using the output of “cdrecord -scanbus” instead. No clue though since I don’t have the hardware to verify from here. Hope that helps!

@[email protected] · 4 months ago

This looks like it’ll work perfectly, thank you! When I get home from work I’ll play around with -scanbus and see if it works out first, then I’ll try with the space and if no dice I’ll try without the space!

I’m also going to try k3b and see how that works as another poster was saying, but at this point I think I prefer the script lmao!