koreader/platform/kobo/obtain-ip.sh

#!/bin/sh

# NOTE: Close any non-standard fds, so that it doesn't come back to bite us in the ass with USBMS later...
for fd in /proc/"$$"/fd/*; do
    fd_id="$(basename "${fd}")"
    if [ -e "${fd}" ] && [ "${fd_id}" -gt 2 ]; then
        # NOTE: dash (meaning, in turn, busybox's ash, uses fd 10+ open to /dev/tty or $0 (w/ CLOEXEC))
        fd_path="$(readlink -f "${fd}")"
        if [ "${fd_path}" != "/dev/tty" ] && [ "${fd_path}" != "$(readlink -f "${0}")" ] && [ "${fd}" != "${fd_path}" ]; then
            eval "exec ${fd_id}>&-"
            echo "[obtain-ip.sh] Closed fd ${fd_id} -> ${fd_path}"
        fi
    fi
done

./release-ip.sh

# NOTE: Prefer dhcpcd over udhcpc if available. That's what Nickel uses,
#       and udhcpc appears to trip some insanely wonky corner cases on current FW (#6421)
if [ -x "/sbin/dhcpcd" ]; then
    dhcpcd -d -t 30 -w "${INTERFACE}"
else
    udhcpc -S -i "${INTERFACE}" -s /etc/udhcpc.d/default.script -b -q
fi