functions

#!/bin/bash
# vim: noai:ts=4:sw=4:syn=sh

#   Copyright 2013 Jon Allen (ylixir@gmail.com)
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#
# functions
# this is the script that builder.sh sources to do all the dirty work

# this function simply deletes everything
clean_directories ()
{
  rm -rf $BASE_DIR/$ROOT_TARGET;
  rm -rf $BASE_DIR/$DEBOOT_DIR;
  rm -rf $BASE_DIR/$KERNEL_DIR;
}
# just make the directories we'll need
create_directories ()
{
  mkdir -p $BASE_DIR/$DEBOOT_DIR;
  mkdir -p $BASE_DIR/$ROOT_TARGET;
  mkdir -p $BASE_DIR/$KERNEL_DIR;
  mkdir -p $BASE_DIR/$ROOT_TARGET/$KERNEL_DIR;
  mkdir -p $BASE_DIR/$KERNEL_OUT_DIR;
}

#do path magic
ORIGINAL_PATH=$PATH
set_path ()
{
  ORIGINAL_PATH=$PATH;
  PATH=$DUAL_PATH;
}
reset_path ()
{
  PATH=$ORIGINAL_PATH;
}
#do the mount magic
do_mount ()
{
  sleep 1;
  mount -o bind $BASE_DIR/$KERNEL_DIR $BASE_DIR/$ROOT_TARGET/$KERNEL_DIR;
  mount -t proc proc $BASE_DIR/$ROOT_TARGET/proc/;
  mount -t sysfs sys $BASE_DIR/$ROOT_TARGET/sys/;
  mount -o bind /dev $BASE_DIR/$ROOT_TARGET/dev/;
  mount -t devpts devpts -o mode=620,gid=5 $BASE_DIR/$ROOT_TARGET/dev/pts/;
}
do_unmount ()
{
  sleep 1;
  umount $BASE_DIR/$ROOT_TARGET/dev/pts/;
  umount $BASE_DIR/$ROOT_TARGET/dev/;
  umount $BASE_DIR/$ROOT_TARGET/sys/;
  umount $BASE_DIR/$ROOT_TARGET/proc/;
  umount $BASE_DIR/$ROOT_TARGET/$KERNEL_DIR;
}
enter_chroot ()
{
  chroot $BASE_DIR/$ROOT_TARGET /bin/bash;
}
# this function gets the debootstrap package and unpacks it into the appropriate directory, all ready to be used
get_deboot ()
{
  cd $BASE_DIR/$DEBOOT_DIR;
  wget -c $DEBOOT_SRC/$DEBOOT_DEB;
  ar -x $DEBOOT_DEB;
  tar -xf data.tar.xz;
  cd $BASE_DIR;
}

# this function just creates the chroot environment
deboot_stage_one ()
{
  # do the bootstrap
  DEBOOTSTRAP_DIR=$BASE_DIR/$DEBOOT_DIR/usr/share/debootstrap $BASE_DIR/$DEBOOT_DIR/usr/sbin/debootstrap --foreign --arch=$ROOT_ARCH --variant=buildd --no-check-gpg $ROOT_SUITE $BASE_DIR/$ROOT_TARGET $ROOT_SOURCE;
}
deboot_stage_two ()
{
  #do the second stage bootstrap
  chroot $BASE_DIR/$ROOT_TARGET /debootstrap/debootstrap --second-stage;
}
deboot_setup ()
{
#stop dpkg from running daemons
cat > $BASE_DIR/$ROOT_TARGET/usr/sbin/policy-rc.d <<EOF
#!/bin/sh
exit 101
EOF
  chmod a+x $BASE_DIR/$ROOT_TARGET/usr/sbin/policy-rc.d;

  # update the chroot's sources.list
  printf '%s' "$ROOT_SOURCES_LIST" >$BASE_DIR/$ROOT_TARGET/etc/apt/sources.list;
  
  #update the locale
  printf '%s' "$ROOT_LOCALE" >$BASE_DIR/$ROOT_TARGET/etc/locale.gen;
  chroot $BASE_DIR/$ROOT_TARGET /usr/sbin/locale-gen

  #divert ischroot
  #note that this throws error, my need to be fixed, not sure
  chroot $BASE_DIR/$ROOT_TARGET dpkg-divert --divert /usr/bin/ischroot.debianutils --rename /usr/bin/ischroot;
  chroot $BASE_DIR/$ROOT_TARGET /bin/ln -s /bin/true /usr/bin/ischroot;

}

# bring the chroot current
upgrade_chroot ()
{
  chroot $BASE_DIR/$ROOT_TARGET apt-get -qy update;
  chroot $BASE_DIR/$ROOT_TARGET apt-get -qy dist-upgrade;
}

# install required packages in the chroot
install_build_tools ()
{
  chroot $BASE_DIR/$ROOT_TARGET apt-get -qy install $REQUIRED_PACKAGES;
}

# this function gets the architecture for our chroot
# currently only ix86 32 and 64 bit targets are supported
# but I'll eventually get around to adding more
get_architecture ()
{
  case `uname -m` in
    i?86)
      ROOT_ARCH=i386
      ;;
    x86_64)
      ROOT_ARCH=amd64
      ;;
    *)
      echo "I don't know what kind of architecture the chroot needs to be"
      exit 1
      ;;
  esac;
}

#functions for managing the kernel source
kernel_get ()
{
  git clone $KERNEL_REPO $BASE_DIR/$KERNEL_DIR;
}
kernel_pull ()
{
  git -C $BASE_DIR/$KERNEL_DIR pull;
}
#see https://wiki.ubuntu.com/Nexus7/Kernel for more information
kernel_build ()
{
  set_path;
  do_mount;
  cd $BASE_DIR/$ROOT_TARGET/$KERNEL_DIR;
  git clean -xdf;
  export ARCH=arm;
  export SUBARCH=arm;
  export CROSS_COMPILE="ccache arm-linux-gnueabihf-"
  chroot $BASE_DIR/$ROOT_TARGET su - -c "cd /"$KERNEL_DIR"; make ARCH=arm SUBARCH=arm CROSS_COMPILE="'"ccache arm-linux-gnueabihf-"'" mrproper";
  chroot $BASE_DIR/$ROOT_TARGET su - -c "cd /"$KERNEL_DIR"; make ARCH=arm SUBARCH=arm CROSS_COMPILE="'"ccache arm-linux-gnueabihf-"'" grouper_ubuntu_defconfig";
  chroot $BASE_DIR/$ROOT_TARGET su - -c "cd /"$KERNEL_DIR"; make -j$BUILD_PROCESSES ARCH=arm SUBARCH=arm CROSS_COMPILE="'"ccache arm-linux-gnueabihf-"';
  cp $BASE_DIR/$KERNEL_DIR/arch/arm/boot/zImage $BASE_DIR/$KERNEL_OUT_DIR/

#  sed -i '/do_tools/ s/true/false/' debian.nexus7/rules.d/armhf.mk;
#  chroot $BASE_DIR/$ROOT_TARGET su - -c "cd /"$KERNEL_DIR"; fakeroot debian/rules clean";
#  chroot $BASE_DIR/$ROOT_TARGET su - -c 'cd /'$KERNEL_DIR'; debuild -eDEB_BUILD_OPTIONS="parallel='$BUILD_PROCESSES'" -eCROSS_COMPILE="ccache arm-linux-gnueabihf-" -b -aarmhf -us -uc -nc';
  cd $BASE_DIR;
  do_unmount;
  reset_path;
}
kernel_boot ()
{
  echo 'Creating test.img';
  echo "cmdline=$KERNEL_CMD_LINE">$BASE_DIR/$KERNEL_OUT_DIR/cmd.txt
  abootimg --create $BASE_DIR/$KERNEL_OUT_DIR/test.img -f $BASE_DIR/$KERNEL_OUT_DIR/cmd.txt -k $BASE_DIR/$KERNEL_OUT_DIR/$KERNEL_TARGET -r $BASE_DIR/$KERNEL_OUT_DIR/$RAMDISK_TARGET;
#  fastboot boot $BASE_DIR/$KERNEL_OUT_DIR/$KERNEL_TARGET $BASE_DIR/$KERNEL_OUT_DIR/$RAMDISK_TARGET -c "$KERNEL_CMD_LINE";
  echo 'Booting test.img';
  fastboot boot $BASE_DIR/$KERNEL_OUT_DIR/test.img;
}
# this patch was attempting to fix a problem that was actually a path
# problem, so it's currently not used, but left in case it's needed later
# deboot comes out of the box with an offensive mount command.
# this patches it to fix the error when mounting the proc file system
# this patch from http://blog.tsunanet.net/2013/01/using-debootstrap-with-grsec.html?m=1
patch_deboot ()
{
local MOUNT_PATCH="--- usr/share/debootstrap/functions.orig	2013-11-26 07:15:53.909242727 -0600
+++ usr/share/debootstrap/functions	2013-11-26 07:17:39.464665969 -0600
@@ -998,12 +998,14 @@
 		umount_on_exit /proc/bus/usb
 		umount_on_exit /proc
 		umount "'"'"\$TARGET/proc"'"'" 2>/dev/null || true
-		in_target mount -t proc proc /proc
+#		in_target mount -t proc proc /proc
+		sudo mount -o bind /proc "'"'"\$TARGET/proc"'"'"
 		if [ -d "'"'"\$TARGET/sys"'"'" ] && \\
 		   grep -q '[[:space:]]sysfs' /proc/filesystems 2>/dev/null; then
 			umount_on_exit /sys
 			umount "'"'"\$TARGET/sys"'"'" 2>/dev/null || true
-			in_target mount -t sysfs sysfs /sys
+#			in_target mount -t sysfs sysfs /sys
+			sudo mount -o bin /sys "'"'"\$TARGET/sys"'"'"
 		fi
 		on_exit clear_mtab
 		;;
";

printf '%s' "$MOUNT_PATCH"|patch --ignore-whitespace --verbose $BASE_DIR/$DEBOOT_DIR/usr/share/debootstrap/functions;
}