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#!/bin/bash
#
# arch-bootstrap: Bootstrap a base Arch Linux system using any GNU distribution.
#
# Dependencies: bash >= 4, coreutils, wget, sed, gawk, tar, gzip, chroot, xz.
# Project: https://github.com/tokland/arch-bootstrap
#
# Install:
#
# # install -m 755 arch-bootstrap.sh /usr/local/bin/arch-bootstrap
#
# Usage:
#
# # arch-bootstrap destination
# # arch-bootstrap -a x86_64 -r ftp://ftp.archlinux.org destination-64
#
# And then you can chroot to the destination directory (user: root, password: root):
#
# # chroot destination
set -e -u -o pipefail
# Packages needed by pacman (see get-pacman-dependencies.sh)
PACMAN_PACKAGES=(
acl archlinux-keyring attr bzip2 curl expat glibc gpgme libarchive
libassuan libgpg-error libnghttp2 libssh2 lzo openssl pacman pacman-mirrorlist xz zlib
krb5 e2fsprogs keyutils libidn2 libunistring gcc-libs lz4 libpsl icu libunistring zstd
)
BASIC_PACKAGES=(${PACMAN_PACKAGES[*]} filesystem)
EXTRA_PACKAGES=(coreutils bash grep gawk file tar systemd sed)
DEFAULT_REPO_URL="http://mirrors.kernel.org/archlinux"
DEFAULT_ARM_REPO_URL="http://mirror.archlinuxarm.org"
stderr() {
echo "$@" >&2
}
debug() {
stderr "--- $@"
}
extract_href() {
sed -n '/<a / s/^.*<a [^>]*href="\([^\"]*\)".*$/\1/p'
}
fetch() {
curl -L -s "$@"
}
fetch_file() {
local FILEPATH=$1
shift
if [[ -e "$FILEPATH" ]]; then
curl -L -z "$FILEPATH" -o "$FILEPATH" "$@"
else
curl -L -o "$FILEPATH" "$@"
fi
}
uncompress() {
local FILEPATH=$1 DEST=$2
case "$FILEPATH" in
*.gz)
tar xzf "$FILEPATH" -C "$DEST";;
*.xz)
xz -dc "$FILEPATH" | tar x -C "$DEST";;
*)
debug "Error: unknown package format: $FILEPATH"
return 1;;
esac
}
###
get_default_repo() {
local ARCH=$1
if [[ "$ARCH" == arm* || "$ARCH" == aarch64 ]]; then
echo $DEFAULT_ARM_REPO_URL
else
echo $DEFAULT_REPO_URL
fi
}
get_core_repo_url() {
local REPO_URL=$1 ARCH=$2
if [[ "$ARCH" == arm* || "$ARCH" == aarch64 ]]; then
echo "${REPO_URL%/}/$ARCH/core"
else
echo "${REPO_URL%/}/core/os/$ARCH"
fi
}
get_template_repo_url() {
local REPO_URL=$1 ARCH=$2
if [[ "$ARCH" == arm* || "$ARCH" == aarch64 ]]; then
echo "${REPO_URL%/}/$ARCH/\$repo"
else
echo "${REPO_URL%/}/\$repo/os/$ARCH"
fi
}
configure_pacman() {
local DEST=$1 ARCH=$2
debug "configure DNS and pacman"
cp "/etc/resolv.conf" "$DEST/etc/resolv.conf"
SERVER=$(get_template_repo_url "$REPO_URL" "$ARCH")
echo "Server = $SERVER" > "$DEST/etc/pacman.d/mirrorlist"
}
configure_minimal_system() {
local DEST=$1
mkdir -p "$DEST/dev"
sed -ie 's/^root:.*$/root:$1$GT9AUpJe$oXANVIjIzcnmOpY07iaGi\/:14657::::::/' "$DEST/etc/shadow"
touch "$DEST/etc/group"
echo "bootstrap" > "$DEST/etc/hostname"
sed -i "s/^[[:space:]]*\(CheckSpace\)/# \1/" "$DEST/etc/pacman.conf"
sed -i "s/^[[:space:]]*SigLevel[[:space:]]*=.*$/SigLevel = Never/" "$DEST/etc/pacman.conf"
}
fetch_packages_list() {
local REPO=$1
debug "fetch packages list: $REPO/"
fetch "$REPO/" | extract_href | awk -F"/" '{print $NF}' | sort -rn ||
{ debug "Error: cannot fetch packages list: $REPO"; return 1; }
}
install_pacman_packages() {
local BASIC_PACKAGES=$1 DEST=$2 LIST=$3 DOWNLOAD_DIR=$4
debug "pacman package and dependencies: $BASIC_PACKAGES"
for PACKAGE in $BASIC_PACKAGES; do
local FILE=$(echo "$LIST" | grep -m1 "^$PACKAGE-[[:digit:]].*\(\.gz\|\.xz\)$")
test "$FILE" || { debug "Error: cannot find package: $PACKAGE"; return 1; }
local FILEPATH="$DOWNLOAD_DIR/$FILE"
debug "download package: $REPO/$FILE"
fetch_file "$FILEPATH" "$REPO/$FILE"
debug "uncompress package: $FILEPATH"
uncompress "$FILEPATH" "$DEST"
done
}
configure_static_qemu() {
local ARCH=$1 DEST=$2
[[ "$ARCH" == arm* ]] && ARCH=arm
QEMU_STATIC_BIN=$(which qemu-$ARCH-static || echo )
[[ -e "$QEMU_STATIC_BIN" ]] ||\
{ debug "no static qemu for $ARCH, ignoring"; return 0; }
cp "$QEMU_STATIC_BIN" "$DEST/usr/bin"
}
install_packages() {
local ARCH=$1 DEST=$2 PACKAGES=$3
debug "install packages: $PACKAGES"
LC_ALL=C chroot "$DEST" /usr/bin/pacman \
--noconfirm --arch $ARCH -Sy --force $PACKAGES
}
show_usage() {
stderr "Usage: $(basename "$0") [-q] [-a i686|x86_64|arm] [-r REPO_URL] [-d DOWNLOAD_DIR] DESTDIR"
}
main() {
# Process arguments and options
test $# -eq 0 && set -- "-h"
local ARCH=
local REPO_URL=
local USE_QEMU=
local DOWNLOAD_DIR=
local PRESERVE_DOWNLOAD_DIR=
while getopts "qa:r:d:h" ARG; do
case "$ARG" in
a) ARCH=$OPTARG;;
r) REPO_URL=$OPTARG;;
q) USE_QEMU=true;;
d) DOWNLOAD_DIR=$OPTARG
PRESERVE_DOWNLOAD_DIR=true;;
*) show_usage; return 1;;
esac
done
shift $(($OPTIND-1))
test $# -eq 1 || { show_usage; return 1; }
[[ -z "$ARCH" ]] && ARCH=$(uname -m)
[[ -z "$REPO_URL" ]] &&REPO_URL=$(get_default_repo "$ARCH")
local DEST=$1
local REPO=$(get_core_repo_url "$REPO_URL" "$ARCH")
[[ -z "$DOWNLOAD_DIR" ]] && DOWNLOAD_DIR=$(mktemp -d)
mkdir -p "$DOWNLOAD_DIR"
[[ -z "$PRESERVE_DOWNLOAD_DIR" ]] && trap "rm -rf '$DOWNLOAD_DIR'" KILL TERM EXIT
debug "destination directory: $DEST"
debug "core repository: $REPO"
debug "temporary directory: $DOWNLOAD_DIR"
# Fetch packages, install system and do a minimal configuration
mkdir -p "$DEST"
local LIST=$(fetch_packages_list $REPO)
install_pacman_packages "${BASIC_PACKAGES[*]}" "$DEST" "$LIST" "$DOWNLOAD_DIR"
configure_pacman "$DEST" "$ARCH"
configure_minimal_system "$DEST"
[[ -n "$USE_QEMU" ]] && configure_static_qemu "$ARCH" "$DEST"
install_packages "$ARCH" "$DEST" "${BASIC_PACKAGES[*]} ${EXTRA_PACKAGES[*]}"
configure_pacman "$DEST" "$ARCH" # Pacman must be re-configured
[[ -z "$PRESERVE_DOWNLOAD_DIR" ]] && rm -rf "$DOWNLOAD_DIR"
debug "Done!"
debug
debug "You may now chroot or arch-chroot from package arch-install-scripts:"
debug "$ sudo arch-chroot $DEST"
}
main "$@"