#!/bin/bash
#
# Blueprint to build grub-0.95. 
# 
# GRUB is a bootloader that can be used to load the Linux kernel.
#
# The source code is from: ftp://alpha.gnu.org/gnu/grub/
#
# 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}/$PKG_NAME
BUILD_DIR=${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 FHS compliance and i386 processor.
export CC="gcc -mcpu=i386"
cd $BUILD_DIR
$SRC_DIR/configure \
  --exec-prefix=/ \
  --host=i386-pc-linux-gnu \
  --infodir=/usr/share/info \
  --mandir=/usr/share/man \
  --prefix=/usr \
  --without-curses
#
# Check return status and bail out if it's non-zero.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Configuration failed!"
  exit 8
fi
# Build the package.
make
#
# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Build failed!"
  exit 16
fi
#
# Install into staging area overriding make variables as needed.
make \
  exec_prefix=$STAGING_DIR \
  infodir=$STAGING_DIR/usr/share/info \
  mandir=$STAGING_DIR/usr/share/man \
  prefix=$STAGING_DIR/usr \
  install
#
# Check return code and bail if it looks bad.
if [ $? -gt 0 ]; then
  echo "$PKG_NAME: Installation to staging area failed!"
  exit 32
fi
#
# Do some post-install tweaking.
# Copy stage1, stage2 and e2fs_stage1_5 boot image files to /boot/grub as
# these will probably be the most commonly used.  All other stage1_5 will
# stay in /usr/share/grub in order to keep the / filesystem uncluttered.
# System admins who need one of the other stage1_5 images should copy
# them manually.
FILES_TO_MOVE="stage1 stage2 e2fs_stage1_5"
mkdir -p $STAGING_DIR/boot/grub
for FILENAME in $FILES_TO_MOVE; do
  mv $STAGING_DIR/usr/share/grub/i386-pc/$FILENAME $STAGING_DIR/boot/grub;
done
#
# Remove the dir file from the info directory so as not to overwrite
# the dir file on the target system when this package is inistalled.
if [ -e $STAGING_DIR/usr/share/info/dir ]; then
  rm $STAGING_DIR/usr/share/info/dir
fi
#
# end of grub blueprint