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moby--moby/contrib/mkimage-alpine.sh

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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] [-c additional repository] [-a arch]\n' "$0"
exit 1
}
tmp() {
TMP=$(mktemp -d ${TMPDIR:-/var/tmp}/alpine-docker-XXXXXXXXXX)
ROOTFS=$(mktemp -d ${TMPDIR:-/var/tmp}/alpine-docker-rootfs-XXXXXXXXXX)
trap "rm -rf $TMP $ROOTFS" EXIT TERM INT
}
apkv() {
curl -sSL $MAINREPO/$ARCH/APKINDEX.tar.gz | tar -Oxz |
grep --text '^P:apk-tools-static$' -A1 | tail -n1 | cut -d: -f2
}
getapk() {
curl -sSL $MAINREPO/$ARCH/apk-tools-static-$(apkv).apk |
tar -xz -C $TMP sbin/apk.static
}
mkbase() {
$TMP/sbin/apk.static --repository $MAINREPO --update-cache --allow-untrusted \
--root $ROOTFS --initdb add alpine-base
}
conf() {
printf '%s\n' $MAINREPO > $ROOTFS/etc/apk/repositories
printf '%s\n' $ADDITIONALREPO >> $ROOTFS/etc/apk/repositories
}
pack() {
local id
id=$(tar --numeric-owner -C $ROOTFS -c . | docker import - alpine:$REL)
docker tag $id alpine:latest
docker run -i -t --rm 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:sc:a:" opt; do
case $opt in
r)
REL=$OPTARG
;;
m)
MIRROR=$OPTARG
;;
s)
SAVE=1
;;
c)
ADDITIONALREPO=$OPTARG
;;
a)
ARCH=$OPTARG
;;
*)
usage
;;
esac
done
REL=${REL:-edge}
MIRROR=${MIRROR:-http://nl.alpinelinux.org/alpine}
SAVE=${SAVE:-0}
MAINREPO=$MIRROR/$REL/main
ADDITIONALREPO=$MIRROR/$REL/${ADDITIONALREPO:-community}
ARCH=${ARCH:-$(uname -m)}
tmp
getapk
mkbase
conf
pack
save