poky/meta/recipes-devtools/installer/adt-installer/scripts/extract_rootfs

#!/bin/bash

# Yocto ADT Installer
#
# Copyright 2010-2011 by Intel Corp.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy 
# of this software and associated documentation files (the "Software"), to deal 
# in the Software without restriction, including without limitation the rights 
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
# copies of the Software, and to permit persons to whom the Software is 
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in 
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
# THE SOFTWARE.

extract_rootfs()
{

  native_sysroot=$3
  target_sysroot=$2
  PSEUDO_COMMAND="$native_sysroot/usr/bin/pseudo"
  TAR_OPTS="-xjf"
  PSEUDO_OPTS="-P $native_sysroot/usr"


  rm -rf $PSEUDO_LOCALSTATEDIR

  if [ -d "$target_sysroot" ]; then
    echo_info "\nTarget sysroot location: $target_sysroot, already exists! If you continue installation, this folder will be re-created."
    confirm_install $4
    rm -rf "$target_sysroot"
  fi

  if [ ! -d "$target_sysroot" ]; then
    echo_info "Creating directory $target_sysroot..."
    mkdir -p "$target_sysroot"
  fi

  pseudo_state_dir="$target_sysroot/../$(basename "$target_sysroot").pseudo_state"
  mkdir -p "$pseudo_state_dir"
  touch "$pseudo_state_dir/pseudo.pid"
  PSEUDO_LOCALSTATEDIR="$pseudo_state_dir"
  export PSEUDO_LOCALSTATEDIR

  echo_info "Extracting rootfs: $1, using pseudo..."
  $PSEUDO_COMMAND $PSEUDO_OPTS tar -C $2 "$TAR_OPTS" $LOCAL_DOWNLOAD/$1 &>> $YOCTOADT_INSTALL_LOG_FILE
  check_result
}

#Main part
. scripts/util

#Parameter detail is listed below:
#Param 4: Silent install or customize install
#Param 3: OECORE_NATIVE_SYSROOT
#Param 2: user defined rootfs extraction directory
#param 1: sysroot image name
extract_rootfs $1 $2 $3 $4