casper uses grep -E but should use egrep instead (BusyBox)

Binary package hint: casper

Ubuntu 9.10 casper 1.206 uses grep -E which is misuse under BusyBox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu7).

Under BusyBox the correct syntax is "egrep"

egrep -r 'grep -.?E ' *

casper: if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-(ide|scsi|usb)|platform-orion-ehci|platform-mmc|platform-mxsdhci)"; then
casper: for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "/(loop|ram|fd)"); do
casper-premount/10driver_updates: if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-(ide|scsi|usb))"; then

This misuse is within casper:is_nice_device(), casper:find_livefs() and casper-premount/10driver_updates:is_nice_device()

The result is filters that don't filter anything with many useless tries:

For instance

grep 'get_fstype /dev/ram' /var/log/casper.log | wc -l

gives 96.

In many case it doesn't hurt, but in some special cases it a potential slow-downer worth getting rid of.

Replacing "grep -vE" with egrep -v" solves the issue.

Philippe Lelédy