79 lines
1.5 KiB
Bash
79 lines
1.5 KiB
Bash
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#!/bin/sh
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set -eu
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ensure() {
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command -v $1 >/dev/null || (echo "$1 not found"; exit 1)
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}
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ensure curl
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ensure tar
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ensure gunzip
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ensure mount
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uid=$(id -u)
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if [ "$uid" -ne 0 ]; then
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ensure sudo
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exec sudo $0
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fi
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arch="x86_64"
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case $(uname -m) in
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"x86_64") arch=x86_64 ;;
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"i686") arch=x86 ;;
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*) exit 1 ;;
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esac
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version=${VERSION:-3.15.0}
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branch="v$(echo $version | rev | cut -d'.' -f2- | rev)"
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filename="alpine-minirootfs-$version-$arch.tar.gz"
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# clean up, just in case
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rm -f "$filename"
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umount new_root 2>/dev/null || true
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rm -rf new_root
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# download alpine minirootfs
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curl -Ok "https://dl-cdn.alpinelinux.org/alpine/$branch/releases/$arch/$filename"
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# extract the files to new_root
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mkdir new_root
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mount -t tmpfs tmpfs new_root
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< "$filename" gunzip | tar xf - -C new_root
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rm -f "$filename"
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cd new_root
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mkdir old_root
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mount -t sysfs sysfs sys
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mount -t devtmpfs devtmpfs dev
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mount -t proc proc proc
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cp /etc/resolv.conf etc/resolv.conf
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echo '
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pivot_root . old_root
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rm second_stage.sh
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apk add alpine-base util-linux-misc syslinux
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/bin/umount -Rl old_root/* 2>/dev/null
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rm -rf old_root/*
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export DISKOPTS="-k lts /old_root"
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echo sys > /tmp/alpine-install-diskmode.out
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setup-alpine
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echo "Fixing MBR..."
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rootdev=$(grep old_root /proc/mounts | cut -d" " -f1 | sed -E "s/[0-9]+$//")
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dd if=/usr/share/syslinux/mbr.bin of=$rootdev
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extlinux -i /old_root/boot
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echo "It is now safe to turn off your computer."
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' > second_stage.sh
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bin/ash second_stage.sh
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# that will probably fail
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reboot
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