bootstrap an alpine on non-root user's home, and provide a script to use inside binary

bootstrap.sh

#!/bin/sh

CWD=$(dirname $(realpath $0))
cd $CWD


TARGET_VER="3.21"
FULL_VER="${TARGET_VER}.3"
TARGET_DIR="${CWD}/sys"
TARGET_APK_REPO="mirrors.ustc.edu.cn"
TARGET_ARCH="x86_64"
BUILD_DIR="${CWD}/tmp"
REPO_BASE="https://${TARGET_APK_REPO}/alpine/v${TARGET_VER}"
ROOT_LINK="${REPO_BASE}/releases/${TARGET_ARCH}/alpine-minirootfs-${FULL_VER}-${TARGET_ARCH}.tar.gz"

init() {
  mkdir -p ${TARGET_DIR}
  mkdir -p ${BUILD_DIR}

  cd ${BUILD_DIR}

  repolistlink="${REPO_BASE}/main/${TARGET_ARCH}"

  apkfile=$(wget ${repolistlink} -O-  2>/dev/null | grep 'apk-tools-static' | sed -n 's/^[^"]\+"\(.*\)".\+$/\1/p')
  apklink="${repolistlink}/$apkfile"
  echo "found apklink => ${apklink}"

  wget ${apklink} -O apk.tar.gz
  wget ${ROOT_LINK} -O root.tar.gz

  # 下载完成 解压到目标目录
  cd ${TARGET_DIR}
  tar -xvf ${BUILD_DIR}/apk.tar.gz
  tar -xvf ${BUILD_DIR}/root.tar.gz
    
  proot -R ${TARGET_DIR} -0 /sbin/apk.static \
	  -X "${REPO_BASE}/main" \
	  -U --allow-untrusted \
    --initdb \
    add alpine-base

  rm -rf ${BUILD_DIR}
  ln -s ${CWD}/with.alpine ~/.local/bin/
}

init

with.alpine

#!/bin/sh

CWD=$(dirname $(realpath $0))
cd ${CWD}

SYS="${CWD}/sys"

realproot=$(which proot)

PATH="${SYS}/bin:${SYS}/sbin:${SYS}/usr/bin:${SYS}/usr/sbin:${SYS}/usr/local/bin" ${realproot} -R ${SYS} -0 $@