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#!/bin/sh
err() {
echo "$@" >&2
exit 1
}
if [ "$(id -u)" -ne 0 ]; then
err 'Please run as root'
fi
if [ -z "$1" ]
then
err 'Specify path as the first argument'
fi
ensure() {
{ set +x; } 2>/dev/null
[ $# -lt 1 ] && return 0
$@ || err failed executing: "$@"
set -x
}
if [ -z "$alpine_mirror" ]
then
alpine_mirror='https://dl-cdn.alpinelinux.org/alpine'
fi
export alpine_mirror
ensure export arch="$(uname -m)"
export release='edge'
ensure export chroot_dir="$(ensure realpath -- "$1")"
ensure export rxrand="$(base64 < /dev/random | tr -d '/+=' | head -c 10)"
set -xu
umask 022
ensure mkdir -p "${chroot_dir}"
# DOWNLOAD APK AND BOOTSTRAP BASE SYSTEM
ensure mkdir "/tmp/alpine-chroot-tmp-$rxrand"
ensure cd "/tmp/alpine-chroot-tmp-$rxrand"
ensure curl -LO "${alpine_mirror}/${release}/main/${arch}/APKINDEX.tar.gz"
ensure tar xvf APKINDEX.tar.gz
ensure export apk_version="$(sed -n '/P:apk-tools-static/{n;p;}' APKINDEX | cut -d ':' -f 2)"
ensure curl -LO "${alpine_mirror}/${release}/main/${arch}/apk-tools-static-${apk_version}.apk"
ensure tar -xzf apk-tools-static-*.apk
ensure ./sbin/apk.static -X "${alpine_mirror}/${release}/main" -U --allow-untrusted -p "${chroot_dir}" --initdb add alpine-base
ensure cd "${chroot_dir}"
ensure rm -rf "/tmp/alpine-chroot-tmp-$rxrand"
# ADD REPOSITORIES TO APK
ensure cp -L /etc/resolv.conf ${chroot_dir}/etc/
ensure mkdir -p ${chroot_dir}/etc/apk
ensure echo "${alpine_mirror}/${release}/main" > ${chroot_dir}/etc/apk/repositories
ensure echo "${alpine_mirror}/${release}/community" >> ${chroot_dir}/etc/apk/repositories
if [ "${release}" = edge ]
then
ensure echo "${alpine_mirror}/edge/testing" >> ${chroot_dir}/etc/apk/repositories
fi
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