Add initial version of disk generation scripts

alpine_install

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+# Alpine Linux installation answers
+# Doc: https://docs.alpinelinux.org/user-handbook/0.1a/Installing/setup_alpine.html#_answer_files
+# Serve e.g. with "ncat -e '/bin/cat alpine_install' -l -p 2222 -k"
+# Get in alpine e.g. using "sleep 1 | nc … > file" and use with "setup-alpine -e -f file"
+# After installation, boot the VM from the disk and run alpine_postinst script
+#     (serve similarly to this file). This script performs a few tweaks to the
+#     installation, like installing BIRD.
+
+# Use US layout with US variant
+KEYMAPOPTS="us us"
+
+# Set hostname to alpine-test
+HOSTNAMEOPTS="-n dummy-install"
+
+# Contents of /etc/network/interfaces
+# We will overwrite this later, so it does not matter much
+# While preparing, network is useful to share files with VM.
+INTERFACESOPTS="auto lo
+iface lo inet loopback
+
+auto eth0
+iface eth0 inet dhcp
+"
+
+DNSOPTS="-d whatever.invalid 1.1.1.1"
+
+# Set timezone to UTC
+TIMEZONEOPTS="-z UTC"
+
+# This seems to work, somehow.
+PROXYOPTS="none"
+
+APKREPOSOPTS="-1"
+
+# Install Openssh
+SSHDOPTS="-c openssh"
+
+NTPOPTS="-c busybox"
+
+DISKOPTS="-m sys -s 0 /dev/sda"
+BOOTLOADER=syslinux
+

alpine_postinst

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+#!/bin/echo Run this in VM.
+
+# TODO
+
+# Add SSH keys
+
+# Install bird and maybe other tools
+
+# Run nameif at boot to set network names
+# Doc: https://wiki.alpinelinux.org/wiki/Custom_network_interface_names

gen_dummy.sh

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+#!/bin/sh
+
+set -exu
+
+disk_size=4G
+
+dl_alpine() {
+	tmpdir="$(mktemp --directory)"
+	trap "rm $tmpdir" EXIT
+	pushd "$tmpdir"
+
+	# Setup GPG
+	wget 'https://alpinelinux.org/keys/ncopa.asc'
+	gpg --import ncopa.asc
+
+	wget 'https://dl-cdn.alpinelinux.org/alpine/v3.15/releases/x86_64/alpine-virt-3.15.4-x86_64.iso' 'https://dl-cdn.alpinelinux.org/alpine/v3.15/releases/x86_64/alpine-virt-3.15.4-x86_64.iso.asc'
+	gpg --verify alpine-virt-3.15.4-x86_64.iso.asc alpine-virt-3.15.4-x86_64.iso
+
+	# Cleanup
+	popd
+	mv "$tmpdir/alpine-virt-3.15.4-x86_64.iso" .
+	rm "$tmpdir/alpine-virt-3.15.4-x86_64.iso.asc" "$tmpdir/ncopa.asc"
+	rmdir "$tmpdir"
+	trap - EXIT
+}
+
+test -f alpine-virt-3.15.4-x86_64.iso || dl_alpine
+
+# Clean old disk
+test -f dummydisk.img && rm dummydisk.img
+
+qemu-img create -f raw dummydisk.img "$disk_size"
+
+# Launch installation
+# Basic VM is sufficient
+qemu-system-x86_64 -enable-kvm -m 2G -cdrom alpine-virt-3.15.4-x86_64.iso -drive media=disk,format=raw,file=dummydisk.img
+
+# Now the user has to run installation from the VM. See ./alpine_install for details.