os: build bootable images

os/internal/stage1.sh

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+#!/bin/sh
+set -e
+
+apk add --update-cache alpine-base \
+  linux-lts linux-firmware-none \
+  mkinitfs dosfstools e2fsprogs \
+  tzdata chrony
+
+apk add --allow-untrusted /mnt/target/os/krata.apk
+
+for SERVICE in kratad kratanet
+do
+  rc-update add "${SERVICE}" default
+done
+
+apk add xen xen-hypervisor
+
+for SERVICE in xenconsoled xenstored
+do
+  rc-update add "${SERVICE}" default
+done
+
+for MODULE in xen-netblock xen-blkback tun tap
+do
+  echo "${MODULE}" >> /etc/modules
+done
+
+cat > /etc/network/interfaces <<-EOF
+  auto eth0
+	iface eth0 inet dhcp
+EOF
+
+for SERVICE in networking chronyd
+do
+  rc-update add "${SERVICE}" default
+done
+
+for SERVICE in devfs dmesg mdev hwdrivers cgroups
+do
+  rc-update add "${SERVICE}" sysinit
+done
+
+for SERVICE in modules hwclock swap hostname sysctl bootmisc syslog seedrng
+do
+  rc-update add "${SERVICE}" boot
+done
+
+for SERVICE in killprocs savecache mount-ro
+do
+  rc-update add "${SERVICE}" shutdown
+done
+
+echo 'root:krata' | chpasswd
+echo 'krata' > /etc/hostname
+
+{
+  echo '# krata resolver configuration'
+  echo 'nameserver 1.1.1.1'
+  echo 'nameserver 1.0.0.1'
+  echo 'nameserver 2606:4700:4700::1111'
+  echo 'nameserver 2606:4700:4700::1001'
+} > /etc/resolv.conf
+
+{
+  echo 'Welcome to krataOS!'
+  echo 'You may now login to the console to manage krata.'
+} > /etc/issue
+
+echo > /etc/motd
+
+ln -s /usr/share/zoneinfo/UTC /etc/localtime
+
+rm -rf /var/cache/apk/*
+rm -rf /.dockerenv
+
+cd /
+rm -f /mnt/target/os/rootfs.tar
+tar cf /mnt/target/os/rootfs.tar --numeric-owner \
+  --exclude 'mnt/**' --exclude 'proc/**' \
+  --exclude 'sys/**' --exclude 'dev/**' .

os/internal/stage2.sh

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+#!/bin/sh
+set -e
+
+apk add --update-cache grub-efi
+grub-install --target=x86_64-efi --efi-directory=/boot/efi --no-nvram --skip-fs-probe --bootloader-id=BOOT
+mv /boot/efi/EFI/BOOT/grubx64.efi /boot/efi/EFI/BOOT/BOOTX64.efi
+
+ROOT_UUID="$(cat /root-uuid)"
+
+{
+    echo 'GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M"'
+    echo "GRUB_CMDLINE_LINUX_DEFAULT=\"quiet rootfstype=ext4 root=UUID=${ROOT_UUID} modules=ext4\""
+    echo 'GRUB_DEFAULT="saved"'
+    echo 'GRUB_SAVEDEFAULT="true"'
+} >> /etc/default/grub
+
+grub-mkconfig -o /boot/grub/grub.cfg
+grub-set-default "$(grep ^menuentry /boot/grub/grub.cfg | grep Xen | cut -d \' -f 2 | head -1)"
+rm -rf /var/cache/apk/*