Add script juju and change the README file

README.md

@@ -1,2 +1,36 @@
-juju
+JuJu
 ====
+**JuJu**: the portable GNU/Linux distribution.
+
+Description
+-----------
+**JuJu** is a small and portable GNU/Linux distribution based on ArchLinux.
+
+JuJu can be used inside another GNU/Linx OS via chroot. It only contains the package manager (called pacman) in order to access to a wide range of packages from ArchLinux repositories.
+
+The main advantage of using JuJu is because you have an isolated environment in which you can install
+packages without affecting a production system. Another advantage is that with JuJu
+you can access to a really wide range of packages inside GNU/Linux systems that contains
+limited repositories (such as CentOS and RedHat).
+
+Quickstart
+----------
+After installing JuJu (See next section) just run the main juju script:
+```bash
+juju
+```
+The first time you execute it, the script will download the JuJu image and place it
+to the default directory ~/.juju.
+You will need root privileges in order to acces to the chroot.
+
+Installation
+------------
+Just clone JuJu somewhere (for example in ~/juju):
+
+```bash
+git clone git://github.com/fsquillace/juju ~/juju
+export PATH=~/juju/bin:$PATH
+```
+
+JuJu can only works on GNU/Linux OS with kernel version greater or equal
+2.6.32 in 32 or 64 bit.

bin/arch-chroot

@@ -0,0 +1,198 @@
+#!/bin/bash
+
+shopt -s extglob
+
+# generated from util-linux source: libmount/src/utils.c
+declare -A pseudofs_types=([anon_inodefs]=1
+                           [autofs]=1
+                           [bdev]=1
+                           [binfmt_misc]=1
+                           [cgroup]=1
+                           [configfs]=1
+                           [cpuset]=1
+                           [debugfs]=1
+                           [devfs]=1
+                           [devpts]=1
+                           [devtmpfs]=1
+                           [dlmfs]=1
+                           [fuse.gvfs-fuse-daemon]=1
+                           [fusectl]=1
+                           [hugetlbfs]=1
+                           [mqueue]=1
+                           [nfsd]=1
+                           [none]=1
+                           [pipefs]=1
+                           [proc]=1
+                           [pstore]=1
+                           [ramfs]=1
+                           [rootfs]=1
+                           [rpc_pipefs]=1
+                           [securityfs]=1
+                           [sockfs]=1
+                           [spufs]=1
+                           [sysfs]=1
+                           [tmpfs]=1)
+
+# generated from: pkgfile -vbr '/fsck\..+' | awk -F. '{ print $NF }' | sort
+declare -A fsck_types=([cramfs]=1
+                       [exfat]=1
+                       [ext2]=1
+                       [ext3]=1
+                       [ext4]=1
+                       [ext4dev]=1
+                       [jfs]=1
+                       [minix]=1
+                       [msdos]=1
+                       [reiserfs]=1
+                       [vfat]=1
+                       [xfs]=1)
+
+out() { printf "$1 $2\n" "${@:3}"; }
+error() { out "==> ERROR:" "$@"; } >&2
+msg() { out "==>" "$@"; }
+msg2() { out "  ->" "$@";}
+die() { error "$@"; exit 1; }
+
+ignore_error() {
+  "$@" 2>/dev/null
+  return 0
+}
+
+in_array() {
+  local i
+  for i in "${@:2}"; do
+    [[ $1 = "$i" ]] && return
+  done
+}
+
+track_mount() {
+  if [[ -z $CHROOT_ACTIVE_MOUNTS ]]; then
+    CHROOT_ACTIVE_MOUNTS=()
+    trap 'chroot_umount' EXIT
+  fi
+
+  mount "$@" && CHROOT_ACTIVE_MOUNTS=("$2" "${CHROOT_ACTIVE_MOUNTS[@]}")
+}
+
+mount_conditionally() {
+  local cond=$1; shift
+  if eval "$cond"; then
+    track_mount "$@"
+  fi
+}
+
+api_fs_mount() {
+  mount_conditionally "! mountpoint -q '$1'" "$1" "$1" --bind &&
+  track_mount proc "$1/proc" -t proc -o nosuid,noexec,nodev &&
+  track_mount sys "$1/sys" -t sysfs -o nosuid,noexec,nodev,ro &&
+  ignore_error mount_conditionally "[[ -d '$1/sys/firmware/efi/efivars' ]]" \
+      efivarfs "$1/sys/firmware/efi/efivars" -t efivarfs -o nosuid,noexec,nodev &&
+  track_mount udev "$1/dev" -t devtmpfs -o mode=0755,nosuid &&
+  track_mount devpts "$1/dev/pts" -t devpts -o mode=0620,gid=5,nosuid,noexec &&
+  track_mount shm "$1/dev/shm" -t tmpfs -o mode=1777,nosuid,nodev &&
+  track_mount run "$1/run" -t tmpfs -o nosuid,nodev,mode=0755 &&
+  track_mount tmp "$1/tmp" -t tmpfs -o mode=1777,strictatime,nodev,nosuid
+}
+
+chroot_umount() {
+  umount "${CHROOT_ACTIVE_MOUNTS[@]}"
+}
+
+valid_number_of_base() {
+  local base=$1 len=${#2} i=
+
+  for (( i = 0; i < len; i++ )); do
+    { _=$(( $base#${2:i:1} )) || return 1; } 2>/dev/null
+  done
+
+  return 0
+}
+
+mangle() {
+  local i= chr= out=
+
+  unset {a..f} {A..F}
+
+  for (( i = 0; i < ${#1}; i++ )); do
+    chr=${1:i:1}
+    case $chr in
+      [[:space:]\\])
+        printf -v chr '%03o' "'$chr"
+        out+=\\
+        ;;
+    esac
+    out+=$chr
+  done
+
+  printf '%s' "$out"
+}
+
+unmangle() {
+  local i= chr= out= len=$(( ${#1} - 4 ))
+
+  unset {a..f} {A..F}
+
+  for (( i = 0; i < len; i++ )); do
+    chr=${1:i:1}
+    case $chr in
+      \\)
+        if valid_number_of_base 8 "${1:i+1:3}" ||
+            valid_number_of_base 16 "${1:i+1:3}"; then
+          printf -v chr '%b' "${1:i:4}"
+          (( i += 3 ))
+        fi
+        ;;
+    esac
+    out+=$chr
+  done
+
+  printf '%s' "$out${1:i}"
+}
+
+dm_name_for_devnode() {
+  read dm_name <"/sys/class/block/${1#/dev/}/dm/name"
+  if [[ $dm_name ]]; then
+    printf '/dev/mapper/%s' "$dm_name"
+  else
+    # don't leave the caller hanging, just print the original name
+    # along with the failure.
+    print '%s' "$1"
+    error 'Failed to resolve device mapper name for: %s' "$1"
+  fi
+}
+
+fstype_is_pseudofs() {
+  (( pseudofs_types["$1"] ))
+}
+
+fstype_has_fsck() {
+  (( fsck_types["$1"] ))
+}
+
+
+usage() {
+  cat <<EOF
+usage: ${0##*/} chroot-dir [command]
+
+    -h             Print this help message
+
+If 'command' is unspecified, ${0##*/} will launch /bin/sh.
+
+EOF
+}
+
+if [[ -z $1 || $1 = @(-h|--help) ]]; then
+  usage
+  exit $(( $# ? 0 : 1 ))
+fi
+
+(( EUID == 0 )) || die 'This script must be run with root privileges'
+chrootdir=$1
+shift
+
+[[ -d $chrootdir ]] || die "Can't create chroot on non-directory %s" "$chrootdir"
+
+api_fs_mount "$chrootdir" || die "failed to setup API filesystems in chroot %s" "$chrootdir"
+track_mount /etc/resolv.conf "$chrootdir/etc/resolv.conf" --bind
+
+SHELL=/bin/sh chroot "$chrootdir" "$@"

bin/juju

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+JUJU_HOME=$1
+[ -n $JUJU_HOME ] && JUJU_HOME=~/.juju
+JUJU_REPO=https://bitbucket.org/fsquillace/juju-repo/raw/master
+JUJU_BIN=$(dirname "$0")
+ORIGIN_WD=$(pwd)
+
+
+function setup_juju(){
+    trap - QUIT EXIT ABRT KILL TERM INT
+    trap "rm -rf ${maindir}; die \"Error occurred when installing $pkggrp\"" EXIT QUIT ABRT KILL TERM INT
+
+    maindir=$(TMPDIR=/tmp mktemp -d -t juju.XXXXXXXXXX)
+    builtin cd ${maindir}
+
+    info "Downloading JuJu..."
+    imagefile=juju-$(uname -m).tar.gz
+    wget ${JUJU_REPO}/$imagefile
+    tar -zxpf $imagefile
+
+    info "Installing JuJu..."
+    mkdir -p $JUJU_HOME
+    cp -f -a ${maindir}/juju/* $JUJU_HOME
+    info "JuJu installed successfully"
+
+    builtin cd $ORIGIN_WD
+    trap - QUIT EXIT ABRT KILL TERM INT
+}
+
+
+function run_juju(){
+    ${JUJU_BIN}/arch-chroot $JUJU_HOME
+}
+
+
+echoerr() { echo "$@" 1>&2; }
+function die(){
+# $@: msg (mandatory) - str: Message to print
+    error $@
+    exit 1
+}
+function error(){
+# $@: msg (mandatory) - str: Message to print
+    echoerr -e "\033[1;31m$@\033[0m"
+}
+function warn(){
+# $@: msg (mandatory) - str: Message to print
+    echoerr -e "\033[1;33m$@\033[0m"
+}
+function info(){
+# $@: msg (mandatory) - str: Message to print
+    echo -e "\033[1;37m$@\033[0m"
+}
+
+if [ ! "$(ls -A $JUJU_HOME)" ]
+then
+    setup_juju
+fi
+
+run_juju
+
+