77 lines
2 KiB
Bash
Executable file
77 lines
2 KiB
Bash
Executable file
#!/bin/sh
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set -e
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set -x
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MAJOR_VERSION=3.10
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MINOR_VERSION=3
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IMAGE=alpine-minirootfs-$MAJOR_VERSION.$MINOR_VERSION-x86_64.tar.gz
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SSH_KEYS=$(cat ~/.ssh/id_rsa.pub)
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RESOLVCONF=/etc/resolv.conf
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working_directory=$(pwd -P)
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rootfs_tmpdir=$(mktemp -d)
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rootfs_url="http://dl-cdn.alpinelinux.org/alpine/v$MAJOR_VERSION/releases/x86_64/$IMAGE"
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run_root () {
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chroot $rootfs_tmpdir /usr/bin/env \
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PATH=/bin:/sbin \
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/bin/sh -c "$*"
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}
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if [ "$(whoami)" != 'root' ]; then
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echo "This script must be run as root." >&2
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exit 1
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fi
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# Download, extract inital rootfs.
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curl "$rootfs_url" -o "$working_directory/$IMAGE"
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tar xf $IMAGE -C $rootfs_tmpdir
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# Add SSH keys
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run_root mkdir -p root/.ssh
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echo $SSH_KEYS > $rootfs_tmpdir/root/.ssh/authorized_keys
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run_root chmod 0600 root/.ssh/authorized_keys
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run_root chmod 0700 root/.ssh
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# Import local resolv.conf.
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cat "$RESOLVCONF" > $rootfs_tmpdir/etc/resolv.conf
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# Make sure init is found by the kernel.
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run_root ln -s /sbin/init /init
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cat > "$rootfs_tmpdir/etc/network/interfaces" <<EOF
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auto lo
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iface lo inet loopback
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auto eth0
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iface eth0 inet6 manual
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pre-up modprobe ipv6 && sysctl -w net.ipv6.conf.eth0.accept_ra=1
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post-up ip addr show dev eth0 | grep inet6 >> /etc/issue
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EOF
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cat > "$rootfs_tmpdir/etc/hostname" <<EOF
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alpine-unconfigured
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EOF
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# Layer atop base rootfs.
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run_root apk update
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run_root apk upgrade
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run_root apk add openssh linux-vanilla openrc udev
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run_root rc-update add udev
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run_root rc-update add sshd
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run_root rc-update add networking
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run_root rc-update add hostname
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# FIXME: add / install rdnssd / ndisc6 / start it on boot
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# ndisc6 is only @testing
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# Generate iniramfs image
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(cd $rootfs_tmpdir; find . | cpio -H newc -o | gzip -9 > "$working_directory/alpine-initramfs.gz")
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cp "$rootfs_tmpdir/boot/vmlinuz-vanilla" "$working_directory/alpine-kernel"
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# Cleanup.
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rm -r "$rootfs_tmpdir"
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# Upload to netboot server. - needs to be done outside sudo
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echo "Use alpine-initramfs.gz alpine-kernel from $working_directory"!
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