/usr/share/tcos/hooks-addons/01dhclient is in initramfs-tools-tcos 0.89.86.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | # hook addon DHCLIENT
# necessary busybox package
# some network stuff
touch $DESTDIR/etc/hosts.allow
touch $DESTDIR/etc/hosts.deny
cpifexists /etc/host.conf /etc/
sed '/hosts:/ chosts: files dns' /etc/nsswitch.conf > $DESTDIR/etc/nsswitch.conf
# put DNS server
dns1=$(grep ^nameserver /etc/resolv.conf 2>/dev/null | grep -v "127.0.0.1" | head -1 | awk '{print $2}')
echo "TCOS_DNS_SERVER=${dns1}" >> ${DESTDIR}/conf/tcos.conf
BUSYBOX=/bin/busybox
[ -e ${DESTDIR}/bin/busybox ] && BUSYBOX=${DESTDIR}/bin/busybox
cpifexists ${TCOS_BINS}/udhcpc-script /bin/
check=$(${BUSYBOX} udhcpc -O 290 2>&1| grep -c swapsrv)
if [ -e ${TCOS_BINS}/busybox ] || [ "${check}" != "0" ]; then
echo " * busybox udhcpc support 'swapsrv' option" >/dev/null
else
echo "ERROR"
echo ""
echo "NO UDHCP support, please install a recent busybox/udhcpc (>= 1:1.13.3) package."
echo ""
fi
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