NAME¶

alpine-chroot-install - bootstrap an Alpine Linux chroot

SYNOPSIS¶

alpine-chroot-install -d /directory [options]

DESCRIPTION¶

This script installs Alpine Linux into a chroot and optionally sets up qemu-user and binfmt to emulate different architecture (e.g. armhf).

OPTIONS AND ENVIRONMENT VARIABLES¶

-a ARCH

CPU architecture for the chroot. If not set, then it's the same as the host's architecture. If it's different from the host's architecture, then it will be emulated using qemu-user. Options: x86_64, x86, aarch64, armhf, armv7, ppc64le, riscv64, s390x.

-b ALPINE_BRANCH

Alpine branch to install (default is latest-stable).

-d CHROOT_DIR

Absolute path to the directory where Alpine chroot should be installed; Debian's version of this script requires giving this explicitly -- such as -d /alpine

-i BIND_DIR

Absolute path to the directory on the host system that should be mounted on the same path inside the chroot (default is PWD, if it's under /home, or none).

-k CHROOT_KEEP_VARS

Names of the environment variables to pass from the host environment into chroot by the enter-chroot script. Name may be an extended regular expression. Default: ARCH CI QEMU_EMULATOR TRAVIS_.*.

-m ALPINE_MIRROR

URI of the Aports mirror to fetch packages from (default is http://dl-cdn.alpinelinux.org/alpine).

-p ALPINE_PACKAGES

Alpine packages to install into the chroot (default is build-base ca-certificates ssl_client).

-r EXTRA_REPOS

Alpine repositories to be added to /etc/apk/repositories (main and community from $ALPINE_MIRROR are always added).

-t TEMP_DIR

Absolute path to the directory where to store temporary files (defaults to `mktemp -d`).

-h

Show this help message and exit.

-v

Print version and exit.

APK_TOOLS_URI

URL of apk.static to download. Default is x86_64 binary from https://gitlab.alpinelinux.org/alpine/apk-tools/-/packages.

APK_TOOLS_SHA256

SHA-256 checksum of $APK_TOOLS_URI.

Each option can be also provided by environment variable. If both option and variable is specified and the option accepts only one argument, then the option takes precedence.

AFTER INSTALL¶

This tool also creates script "enter-chroot" inside the chroot directory, that may be used to enter the chroot environment. That script do the following:

1. saves environment variables specified by $CHROOT_KEEP_VARS and PWD,

2. chroots into $CHROOT_DIR,

3. starts clean environment using "env -i",

4. switches user and simulates full login using "su -l",

5. loads saved environment variables and changes directory to saved PWD,

6. executes specified command or "sh" if not provided.

Example:

sudo alpine-chroot-install -d /alpine -p build-base -p cmake
/alpine/enter-chroot -u $USER ./build