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+#!/bin/sh

+

+set -e

+

+[ $(id -u) -eq 0 ] || {

+	printf >&2 '%s requires root\n' "$0"

+	exit 1

+}

+

+usage() {

+	printf >&2 '%s: [-r release] [-m mirror] [-s]\n' "$0"

+	exit 1

+}

+

+tmp() {

+	TMP=$(mktemp -d /tmp/alpine-docker-XXXXXXXXXX)

+	ROOTFS=$(mktemp -d /tmp/alpine-docker-rootfs-XXXXXXXXXX)

+	trap "rm -rf $TMP $ROOTFS" EXIT TERM INT

+}

+

+apkv() {

+	curl -s $REPO/$ARCH/APKINDEX.tar.gz | tar -Oxz |

+		grep '^P:apk-tools-static$' -A1 | tail -n1 | cut -d: -f2

+}

+

+getapk() {

+	curl -s $REPO/$ARCH/apk-tools-static-$(apkv).apk |

+		tar -xz -C $TMP sbin/apk.static

+}

+

+mkbase() {

+	$TMP/sbin/apk.static --repository $REPO --update-cache --allow-untrusted \

+		--root $ROOTFS --initdb add alpine-base

+}

+

+conf() {

+	printf '%s\n' $REPO > $ROOTFS/etc/apk/repositories

+}

+

+pack() {

+	local id

+	id=$(tar --numeric-owner -C $ROOTFS -c . | docker import - alpine:$REL)

+

+	docker tag $id alpine:latest

+	docker run -i -t alpine printf 'alpine:%s with id=%s created!\n' $REL $id

+}

+

+save() {

+	[ $SAVE -eq 1 ] || return

+

+	tar --numeric-owner -C $ROOTFS -c . | xz > rootfs.tar.xz

+}

+

+while getopts "hr:m:s" opt; do

+	case $opt in

+		r)

+			REL=$OPTARG

+			;;

+		m)

+			MIRROR=$OPTARG

+			;;

+		s)

+			SAVE=1

+			;;

+		*)

+			usage

+			;;

+	esac

+done

+

+REL=${REL:-edge}

+MIRROR=${MIRROR:-http://nl.alpinelinux.org/alpine}

+SAVE=${SAVE:-0}

+REPO=$MIRROR/$REL/main

+ARCH=$(uname -m)

+

+tmp

+getapk

+mkbase

+conf

+pack

+save