in .chroot , IMGFS=ext2
filename .ext2

Sample config for chroot

# Device or image containing Debian filesystem.
# Default: first in /home/user/MyDocs/debian*.img*, /med
# Some examples:
#IMGFILE=/home/user/MyDocs/debian-squeeze-m5.img.ext2
#IMGFILE=/media/mmc1/debian-squeeze-m5.img.ext2
#IMGFILE=/dev/mmcblk1p2
#IMGFILE=/dev/mmcblk0p4

Filesystem used; must always be set when using a parti
# Default: from extension of IMGFILE, or ext2.
#IMGFS=ext2

# Mount point for Debian.
# Default: /debian
CHROOT=/.debian

# New /tmp dir size for printing / PDF creation
# Default: 6M
....