initial commit

install.sh

@@ -0,0 +1,178 @@
+#!/bin/bash
+
+### CONFIGURATION
+archlinux_mirror="https://mirrors.kernel.org/archlinux/"
+
+set -eu
+set -o pipefail
+shopt -s nullglob
+
+### VARIABLES
+declare -A dependencies
+dependencies[pacman]=x
+
+log() {
+	echo "[$(date)]" "$@" >&2
+}
+
+clean_archroot() {
+	local file
+	local prompted=false
+	local lsfd
+	while read file <&${lsfd}; do
+		if [ "${file}" = "installer" ] || [ "${file}" = "packages" ]; then
+			continue
+		fi
+		if ! $prompted; then
+			log "Your /archroot directory contains a stale installation or other data."
+			log "Remove it?"
+			local response
+			read -p '(yes or [no]) ' response
+			if [ "${response}" = "yes" ]; then
+				prompted=true
+			else
+				break
+			fi
+		fi
+		rm -rf "/archroot/${file}"
+	done {lsfd}< <(ls /archroot)
+}
+
+initialize_coredb() {
+	log "Downloading package database ..."
+	wget "${archlinux_mirror}/core/os/x86_64/core.db"
+	log "Unpacking package database ..."
+	mkdir core
+	tar -zxf core.db -C core
+}
+
+remove_version() {
+	echo "${1}" | grep -o '^[A-Za-z0-9_-]*'
+}
+
+get_package_directory() {
+	local dir pkg
+	for dir in core/${1}-*; do
+		if [ "$(get_package_value ${dir}/desc NAME)" = "${1}" ]; then
+			echo "${dir}"
+			return
+		fi
+	done
+	for dir in core/*; do
+		while read pkg; do
+			pkg=$(remove_version "${pkg}")
+			if [ "${pkg}" = "${1}" ]; then
+				echo "${dir}"
+				return
+			fi
+		done < <(get_package_array ${dir}/depends PROVIDES)
+	done
+	log "Package '${1}' not found."
+}
+
+get_package_value() {
+	local infofile=${1}
+	local infokey=${2}
+	get_package_array ${infofile} ${infokey} | (
+		local value
+		read value
+		echo "${value}"
+	)
+}
+
+get_package_array() {
+	local infofile=${1}
+	local infokey=${2}
+	local line
+	while read line; do
+		if [ "${line}" = "%${infokey}%" ]; then
+			while read line; do
+				if [ -z "${line}" ]; then
+					return
+				fi
+				echo "${line}"
+			done
+		fi
+	done < ${infofile}
+}
+
+calculate_dependencies() {
+	log "Calculating dependencies ..."
+	local dirty=true
+	local pkg dir dep
+	while $dirty; do
+		dirty=false
+		for pkg in "${!dependencies[@]}"; do
+			dir=$(get_package_directory $pkg)
+			while read line; do
+				dep=$(remove_version "${line}")
+				if [ -z "${dependencies[$dep]:-}" ]; then
+					dependencies[$dep]=x
+					dirty=true
+				fi
+			done < <(get_package_array ${dir}/depends DEPENDS)
+		done
+	done
+}
+
+download_packages() {
+	log "Downloading packages ..."
+	mkdir -p /archroot/packages
+	local pkg dir filename sha256 localfn
+	for pkg in "${!dependencies[@]}"; do
+		dir=$(get_package_directory ${pkg})
+		filename=$(get_package_value ${dir}/desc FILENAME)
+		sha256=$(get_package_value ${dir}/desc SHA256SUM)
+		localfn=/archroot/packages/${filename}
+		if [ -e "${localfn}" ] && ( echo "${sha256}  ${localfn}" | sha256sum -c ); then
+			continue
+		fi
+		wget "${archlinux_mirror}/core/os/x86_64/${filename}" -O "${localfn}"
+		if [ -e "${localfn}" ] && ( echo "${sha256}  ${localfn}" | sha256sum -c ); then
+			continue
+		fi
+		log "Couldn't download package '${pkg}'."
+		false
+	done
+}
+
+extract_packages() {
+	log "Extracting packages ..."
+}
+
+error_occurred() {
+	log "Error occurred. Exiting."
+}
+
+main() {
+
+	if [ "${EUID}" -ne 0 ] || [ "${UID}" -ne 0 ]; then
+		log "Script must be run as root. Exiting."
+		exit 1
+	fi
+
+	if ! grep -q '^7\.' /etc/debian_version; then
+		log "This script only supports Debian 7.x. Exiting."
+		exit 1
+	fi
+
+	if [ "$(uname -m)" != "x86_64" ]; then
+		log "This script only targets 64-bit machines. Exiting."
+		exit 1
+	fi
+
+	trap error_occurred ERR
+
+	rm -rf /archroot/installer
+	mkdir -p /archroot/installer
+	cd /archroot/installer
+
+	clean_archroot
+	initialize_coredb
+	calculate_dependencies
+	download_packages
+	extract_packages
+
+}
+
+main "$@"