Determine optical media type (Audio CD, DVD, blu-ray) by using UDEV and scripts

[jlivin252]

James
The format of this is wrong:

if [ "$ID_CDROM_MEDIA_DVD"="1" ]

change all similar instances like to style/format of below

if [ $ID_CDROM_MEDIA_DVD = "1" ]  or
if [ "$ID_CDROM_MEDIA_DVD" = "1" ] or
if [ $ID_CDROM_MEDIA_DVD == "1" ]

Without the space, I believe it tests the return value of assignment (always true).
So your script was going to return just dvd.

You made a mess of the first line of script as well:


I have found this to be a very useful resource:
http://www.tldp.org/LDP/Bash-Beginne...ect_07_01.html

Well well well!!

blm-ubunet your advice is well taken, I have changed the construction of the 'if' statements to match and it is now working! , thank you.
Keith_Helm I cant thank you enough for the posix code, this will enable me to further look into this. Thank you.

Udev rule as follows:

# ID_CDROM_MEDIA_BD = Bluray
# ID_CDROM_MEDIA_DVD = DVD
# ID_CDROM_MEDIA_CD = CD
ACTION=="change", SUBSYSTEMS=="scsi", KERNEL=="s[rg][0-9]*", ATTRS{vendor}=="TSSTcorp", ENV{ID_CDROM}=="?*", MODE="0660", GROUP="optical", RUN+="/usr/local/bin/DiscTypeTest3.sh"

links to script as follows

#!/bin/bash
# ID_CDROM_MEDIA_BD = Bluray
# ID_CDROM_MEDIA_DVD = DVD
# ID_CDROM_MEDIA_CD = CD
MEDIA=
if [ $ID_CDROM_MEDIA_DVD = "1" ]
then
        MEDIA=dvd
        (
        echo "$MEDIA" >> "/var/log/DiscTypeTest.log"
        ) &


elif [ $ID_CDROM_MEDIA_CD = "1" ]
then
        MEDIA=cdrom
        (
        echo "$MEDIA" >> "/var/log/DiscTypeTest.log"
        ) &
fi
(set -o posix ; set) > "/var/log/DiscTypeTestVariables.log"

produces the following output in

/var/log/DiscTypeTest.log

when an audio CD is inserted and then a dvd afterwards

cdrom
cdrom
dvd
dvd

SOLVED

[blm-ubunet]

Great news & well solved.
We've probably all made this mistake before & I'm likely to repeat it sometime in the future.