parsing of 'command_line' section of hdparm.conf should evaluate variables

[Jerome Haltom]

Binary package hint: hdparm

/etc/hdparm is parsed by /lib/udev/hdparm. This simple script looks for a specific section: command_line, and runs each line in turn. It's quite hacky. The comments even say so. That's fine.

The command lines run in command_line should have environment variables evaluated. They don't. This would make it easy to access $DEVNAME to figure out what device is being altered, in case a custom hdparm command was being made for it.

The fix is simple:/lib/udev/hdparm should have line 250 altered from:

$KEY $SEP $VALUE

to

eval $KEY $SEP $VALUE

This just results in the string stored in $KEY being evaluated, and variables in it being expanded. Seems to work okay for me.