Fix dhcp.sh script; update kernel (#158)

## Description


`dhcp.sh` wasn't posix compliant and was failing to work accurately. Update the kernel to the latest build.

## Why is this needed



Fixes: #

## How Has This Been Tested?



Manually tested.


## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

Author: mergify[bot]

files/dhcp.sh

@@ -7,33 +7,17 @@
 # false: run the dhcp client as a service
 set -x
 
-parse_cmdline() {
-	c=$(cat /proc/cmdline)
-	c="${c##*"$1"=}"
-	c="${c%% *}"
-	echo "$c"
-}
-
 run_dhcp_client() {
 	one_shot="$1"
 	al="eth*"
 
-	vlan_id=$(parse_cmdline vlan_id)
-	if [ -n "$vlan_id" ]; then
+	if grep "vlan_id" /proc/cmdline; then
 		al="eth*.*"
 	fi
 
-	# Boots send kernel command line parameter "ip=dhcp", this causes the system to configure the network interface(s) with DHCP.
-	# When an environment's network configuration has this machine connected a trunked interface with a default/native VLAN, the
-	# interface will be configured on the default/native VLAN because we haven't yet configured the VLAN interface. Boots will respond
-	# to this DHCP request because in this scenario it is not VLAN aware. Also in this scenario, the machine will end up being configured
-	# with 2 default routes. To resolve this, we remove the default route and IP that kernel added and let the dhcpcd handle setting the route.
-	ip route del default || true
-	ipa=$(ip -4 -o addr show dev eth0 | awk '{print $4}')
-	ip addr del dev eth0 "$ipa" || true
-
 	if [ "$one_shot" = "true" ]; then
-		/sbin/dhcpcd --nobackground -f /dhcpcd.conf --allowinterfaces "${al}" -1
+		# always return true for the one shot dhcp call so it doesn't block Hook from starting up.
+		/sbin/dhcpcd --nobackground -f /dhcpcd.conf --allowinterfaces "${al}" -1 || true
 	else
 		/sbin/dhcpcd --nobackground -f /dhcpcd.conf --allowinterfaces "${al}"
 	fi

hook.yaml

@@ -1,5 +1,5 @@
 kernel:
-  image: quay.io/tinkerbell/hook-kernel:5.10.85-5604bb0dc1cdb6263770a82bf91cbf7e00ffdd5c
+  image: quay.io/tinkerbell/hook-kernel:5.10.85-d1225df88208e5a732e820a182b75fb35c737bdd
   cmdline: "console=tty0 console=ttyS0 console=ttyAMA0 console=ttysclp0"
 
 init: