/usr/lib/rootstrap/modules/tasksel is in rootstrap 0.3.24-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/bin/sh
set -e
if ! test -n "$flags"; then
exit 0
fi
chroot $TARGET dselect update
chroot $TARGET mount /proc
yes '' | chroot $TARGET tasksel $flags
chroot $TARGET umount /proc
chroot $TARGET apt-get clean
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