#!/bin/bash
#
# Blueprint to build bash-3.0 as a static root shell.
#
# Static linking provides an extra degree of robustness to the
# system by ensuring that root still has a working shell even if
# libraries become corrupted or deleted.  bash-static is most
# effective when used with sysvinit-static.
#
# Source code is from ftp://ftp.gnu.org/gnu/bash
#
# This architect blueprint is copyright (c)2003-2004 David Horton
# dhorton@nospam.speakeasy.net
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to: 
#
#   Free Software Foundation, Inc.
#   59 Temple Place - Suite 330
#   Boston, MA 02111-1307, USA
#
#
# Define the package name, source directory, build directory and
# staging directory paths.  Prefixes to directories may be overridden
# by setting shell variables SRC, BUILD and STAGING.  For example,
# doing "export SRC=/root/foo" before calling this script will override
# the default /usr/src and set SRC_DIR to /root/foo/$PKG_NAME instead.
# 
PKG_NAME=$(basename $0)
SRC_DIR=${SRC:-/usr/src}/$PKG_NAME
# Remove "-static" from the source path using sed.
SRC_DIR=$(echo "$SRC_DIR" | sed s/-static//) 
BUILD_DIR=${BUILD:-/var/tmp/build}/$PKG_NAME
STAGING_DIR=${STAGING:-/var/tmp/staging}/$PKG_NAME
#
# Check that the source directory really exits and bail out if not.
if ! [ -d $SRC_DIR ]; then
  echo "$PKG_NAME: Cannot find source code directory $SRC_DIR."
  exit 1
fi
#
# Do not overwrite existing build directory.
if [ -d $BUILD_DIR ]; then
  echo "$PKG_NAME: Build directory $BUILD_DIR already exists."
  exit 2
else
  mkdir -p $BUILD_DIR
fi
#
# Do not overwrite existing staging directory.
if [ -d $STAGING_DIR ]; then
  echo "$PKG_NAME: Staging directory $STAGING_DIR already exists."
  exit 4
else
  mkdir -p $STAGING_DIR
fi
#
# Configure the package for minimal, statically-linked shell and i386
# processor.
export CC="gcc -mcpu=i386"
cd $BUILD_DIR
$SRC_DIR/configure \
  --enable-minimal-config \
  --enable-static-link \
  --host=i386-pc-linux-gnu \
  --exec-prefix=/
#
# Check return status and bail out if it's non-zero.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Configuration failed!"
  exit 8
fi
# Build just the bash binary and skip everthing else like man pages.
make bash
#
# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Build failed!"
  exit 16
fi
#
# Install manually so that just bash is copied into the staging area.
install -d $STAGING_DIR/bin && install bash $STAGING_DIR/bin/bash-static
#
# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Installation to staging area failed!"
  exit 32
fi
#
# Create /bin/sh as a symbolic link to /bin/bash-static.
ln -s bash-static $STAGING_DIR/bin/sh
#
# end of bash-static blueprint