runme: fix nameserver within chroot

Change the ip configuration for the temporary VM to be performed
directly by the kernel; then copy the kernel reported resolv config to
rootfs + chroot.

This will avoid firewall issues that may be experienced in paranoid
homes, or coprorate networks where direct access to public DNS servers
is not allowed.

runme.sh

@@ -281,7 +281,7 @@ case "\$1" in
 		mkfs.ext4 -F /dev/vda -b 4096
 		mount /dev/vda /mnt
 		cd /mnt/
-		udhcpc -i eth0
+		cat /proc/net/pnp > /etc/resolv.conf
 		wget -c -P /tmp/ http://cdimage.ubuntu.com/ubuntu-base/releases/20.04/release/ubuntu-base-20.04.1-base-arm64.tar.gz
 		tar zxf /tmp/ubuntu-base-20.04.1-base-arm64.tar.gz -C /mnt
 		mount -o bind /proc /mnt/proc/
@@ -290,7 +290,7 @@ case "\$1" in
 		mount -o bind /dev/pts /mnt/dev/pts
 		mount -t tmpfs tmpfs /mnt/var/lib/apt/
 		mount -t tmpfs tmpfs /mnt/var/cache/apt/
-		echo "nameserver 8.8.8.8" > /mnt/etc/resolv.conf
+		cat /proc/net/pnp > /mnt/etc/resolv.conf
 		echo "localhost" > /mnt/etc/hostname
 		echo "127.0.0.1 localhost" > /mnt/etc/hosts
 		export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C
@@ -310,7 +310,7 @@ EOF
 	make
 	IMG=ubuntu-core.ext4.tmp
 	truncate -s $ROOTFS_SIZE $IMG
-	qemu-system-aarch64 -m 1G -M virt -cpu cortex-a57 -nographic -smp 1 -kernel output/images/Image -append "console=ttyAMA0" -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 -initrd output/images/rootfs.cpio.gz -drive file=$IMG,if=none,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -no-reboot
+	qemu-system-aarch64 -m 1G -M virt -cpu cortex-a57 -nographic -smp 1 -kernel output/images/Image -append "console=ttyAMA0 ip=dhcp" -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 -initrd output/images/rootfs.cpio.gz -drive file=$IMG,if=none,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -no-reboot
 	mv $IMG $ROOTDIR/build/ubuntu-core.ext4
 fi
 
@@ -338,7 +338,7 @@ case "\$1" in
 		mkfs.ext4 -F /dev/vda -b 4096
 		mount /dev/vda /mnt
 		cd /tmp
-		udhcpc -i eth0
+		cat /proc/net/pnp > /etc/resolv.conf
 		wget http://deb.debian.org/debian/pool/main/d/debootstrap/debootstrap_1.0.123.tar.gz
 		tar zxf debootstrap*.tar.gz
 		cd debootstrap
@@ -356,7 +356,7 @@ case "\$1" in
 		mount -t tmpfs tmpfs /mnt/var/cache/apt/
 		debootstrap --no-check-certificate --verbose --arch arm64 --cache-dir=/tmp/cache --include=fdisk,e2fsprogs,isc-dhcp-client,ntpdate,sudo bullseye /mnt
 		#debootstrap --no-check-certificate --verbose --arch arm64 --cache-dir=/tmp/cache --include=locales,less,wget,procps,openssh-server,ifupdown,net-tools,isc-dhcp-client,ntpdate,lm-sensors,i2c-tools,psmisc,sudo,htop,iproute2,iputils-ping,kmod,network-manager,iptables,rng-tools,apt-utils bullseye /mnt
-		echo "nameserver 8.8.8.8" > /mnt/etc/resolv.conf
+		cat /proc/net/pnp > /mnt/etc/resolv.conf
 		echo "localhost" > /mnt/etc/hostname
 		echo "127.0.0.1 localhost" > /mnt/etc/hosts
 		echo -e "root\nroot" | chroot /mnt passwd
@@ -371,7 +371,7 @@ EOF
 	make
 	IMG=debian-bullseye.ext4.tmp
 	truncate -s 350M $IMG
-	qemu-system-aarch64 -m 1G -M virt -cpu cortex-a57 -nographic -smp 1 -kernel output/images/Image -append "console=ttyAMA0" -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 -initrd output/images/rootfs.cpio.gz -drive file=$IMG,if=none,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -no-reboot
+	qemu-system-aarch64 -m 1G -M virt -cpu cortex-a57 -nographic -smp 1 -kernel output/images/Image -append "console=ttyAMA0 ip=dhcp" -netdev user,id=eth0 -device virtio-net-device,netdev=eth0 -initrd output/images/rootfs.cpio.gz -drive file=$IMG,if=none,format=raw,id=hd0 -device virtio-blk-device,drive=hd0 -no-reboot
 	mv $IMG $ROOTDIR/build/debian-bullseye.ext4
 fi