#!/bin/bash

# msgUsage: show a usage message and exit
msgUsage() {
  echo "Usage: $(basename $0) [TMP_DIR] [PKG_DIR] [RELEASE_DIR] [RELEASE_NAME]"
  echo "Examples:"
  echo " \$ $(basename $0) tmp ports/core-cross releases crux-arm-rootfs-2.7"
  echo " \$ $(basename $0) tmp ports/core-cross releases crux-arm-rootfs-2.6"
  echo " \$ $(basename $0) tmp ports/core-cross-noeabi releases crux-arm-rootfs-2.6-noeabi"
  exit 0
}

# msgWarn: show a warning message
msgWarn() {
  echo "Warning, $@" 2>&1
}

# msgError: show a error message and exit
msgError() {
  echo "Error, $@" 2>&1
  exit 1
}

# checkCommands: checks for command dependencies
checkCommands() {
  for cmd in sudo pkgmk tar md5sum; do
    if ! which $cmd 2>&1 >/dev/null; then
      msgError "'$cmd' is not in your \$PATH and you need it to execute this script"
    fi
  done
}

# checkVars: checks for user given arguments
#
# params:
# $1 - TMP_DIR
# $2 - PKG_DIR
# $3 - RELEASE_DIR
# $4 - RELEASE_NAME
checkVars() {
  [ $# -lt 1 ] && msgUsage
  [ ! -z "$1" ] && TMP_DIR="$1"
  [ "$TMP_DIR" = "/tmp" ] && msgError "you can't use /tmp as TMP_DIR"
  [ ! -z "$2" ] && PKG_DIR="$2"
  [ ! -z "$3" ] && RELEASE_DIR="$3"
  [ ! -z "$4" ] && RELEASE_NAME="$4"
  # check for directories, if not create them
  for dir in $TMP_DIR $RELEASE_DIR; do
    if [ ! -d "$dir" ]; then
      msgWarn "creating directory '$dir'" && install -d $dir || exit 1
    fi
  done
  TMP_DIR="$(cd $TMP_DIR; pwd)"
  PKG_DIR="$(cd $PKG_DIR; pwd)"
  RELEASE_DIR="$(cd $RELEASE_DIR; pwd)"
  [ -z "$PACKAGES" ] && PACKAGES="$(find $PKG_DIR -type f -name '*#*pkg.tar.gz')"
}

# global variables
PWD_DIR="$(pwd)"
TMP_DIR="$PWD_DIR/tmp"
PKG_DIR="$PWD_DIR/pkg"
RELEASE_DIR="$PWD_DIR/releases"
RELEASE_NAME="crux-arm-rootfs-2.7"
PACKAGES=""

checkCommands
checkVars $@

# create the database stuff for pkgutils
sudo install -d -m 0755 $TMP_DIR/var/lib/pkg
sudo touch $TMP_DIR/var/lib/pkg/db
sudo chmod 0444 $TMP_DIR/var/lib/pkg/db

# install all packages
pkgnum=0
for pkg in $PACKAGES; do
  sudo pkgadd -r $TMP_DIR $pkg && echo "Installing $pkg" || exit 1
  let pkgnum=$pkgnum+1
done

# create the tarball and the md5sum
cd $TMP_DIR && sudo tar cvjf $RELEASE_DIR/$RELEASE_NAME.tar.bz2 * && cd ..
cd $RELEASE_DIR && md5sum $RELEASE_NAME.tar.bz2 > $RELEASE_NAME.tar.bz2.md5 && cd ..

echo "Installed packages: $pkgnum"
sudo rm -rf $TMP_DIR
echo "Release done: $RELEASE_DIR/$RELEASE_NAME.tar.bz2"

# End of file