feat: Initial commit

README.md

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+# alpine-infect
+
+> Like nixos-infect, but for Alpine Linux
+
+Not tested on anything else than QEMU with Ubuntu 18.04 (_yet_).
+
+This script **will** destroy your current install. Proceed with caution.
+
+**Usage:**
+```
+./infect.sh
+```

infect.sh

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