# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2018-present Team LibreELEC (https://libreelec.tv)

### FUNCTION HELPERS ###
# die (message, code) abort with optional message and code
die() {
  if [ -n "$1" ]; then
    echo -e "$1" >&2
  fi
  exit "${2:-1}"
}

onexitcleanup() {
  [ $? -eq 0 ] && return

  local _BASH_COMMAND="${BASH_COMMAND}"
 
  if [ -n "${PKG_CURRENT_CALL}" ]; then
    print_color CLR_ERROR "FAILURE: $* during ${PKG_CURRENT_CALL} (${PKG_CURRENT_CALL_TYPE})"
    echo
  fi

  if [ -n "${_BASH_COMMAND}" ]; then
    if [[ ! ${_BASH_COMMAND} =~ ^exit\  ]] && [[ ! ${_BASH_COMMAND} =~ ^return\  ]]; then
      echo "*********** FAILED COMMAND ***********"
      echo "${_BASH_COMMAND}"
      echo "**************************************"
    fi
  fi
}
trap "onexitcleanup $0 $@" EXIT

# return 0 if $2 in space-separated list $1, otherwise return 1
listcontains() {
  if [ -n "$1" -a -n "$2" ]; then
    [[ ${1} =~ (^|[[:space:]])${2}($|[[:space:]]) ]] && return 0 || return 1
  else
    return 1
  fi
}

# remove item(s) from list.
# looping makes it greedy (eg. listremoveitem "abc def ghi" "(abc|def)" removes both "abc" and "def").
listremoveitem() {
  local data="${1}" odata tmp_array
  if [ -n "$1" -a -n "$2" ]; then
    while [ : ]; do
      odata="${data}"
      data="$(echo "${data}" | sed -E "s (^|[[:space:]])${2}($|[[:space:]]) \  g")"
      [ "${odata}" = "${data}" ] && break
    done
  fi
  # Use array word splitting to squash spaces
  tmp_array=(${data})
  echo "${tmp_array[@]}"
}

print_color() {
  local clr_name="$1" clr_text="$2" clr_actual
  local black red green yellow blue magenta cyan white endcolor
  local boldblack boldred boldgreen boldyellow boldblue boldmagenta boldcyan boldwhite

  [ -z "${clr_name}" ] && return 0

  if [ "$DISABLE_COLORS" = "yes" ]; then
    [ $# -eq 2 ] && echo -en "${clr_text}"
    return 0
  fi

  black="\e[0;30m"
  boldblack="\e[1;30m"
  red="\e[0;31m"
  boldred="\e[1;31m"
  green="\e[0;32m"
  boldgreen="\e[1;32m"
  yellow="\e[0;33m"
  boldyellow="\e[1;33m"
  blue="\e[0;34m"
  boldblue="\e[1;34m"
  magenta="\e[0;35m"
  boldmagenta="\e[1;35m"
  cyan="\e[0;36m"
  boldcyan="\e[1;36m"
  white="\e[0;37m"
  boldwhite="\e[1;37m"
  endcolor="\e[0m"

  # $clr_name can be a color variable (boldgreen etc.) or a
  # "standard" color determined by an indirect name (CLR_ERROR etc.)
  #
  # If ${!clr_name} doesn't exist then assume it's a standard color.
  # If ${!clr_name} does exist then check it's not a custom color mapping.
  # Custom color mappings can be configured in options files.
  #
  clr_actual="${!clr_name}"

  if [ -n "${clr_actual}" ]; then
    clr_actual="${!clr_actual}"
  else
    case "${clr_name}" in
      CLR_ERROR)        clr_actual="${boldred}";;
      CLR_WARNING)      clr_actual="${boldred}";;
      CLR_WARNING_DIM)  clr_actual="${red}";;

      CLR_APPLY_PATCH)  clr_actual="${boldgreen}";;
      CLR_AUTORECONF)   clr_actual="${boldmagenta}";;
      CLR_BUILD)        clr_actual="${boldyellow}";;
      CLR_TOOLCHAIN)    clr_actual="${boldmagenta}";;
      CLR_CLEAN)        clr_actual="${boldred}";;
      CLR_FIXCONFIG)    clr_actual="${boldyellow}";;
      CLR_GET)          clr_actual="${boldcyan}";;
      CLR_INFO)         clr_actual="${boldgreen}";;
      CLR_INSTALL)      clr_actual="${boldgreen}";;
      CLR_PATCH_DESC)   clr_actual="${boldwhite}";;
      CLR_TARGET)       clr_actual="${boldwhite}";;
      CLR_UNPACK)       clr_actual="${boldcyan}";;
      CLR_AUTOREMOVE)   clr_actual="${boldblue}";;

      CLR_ENDCOLOR)     clr_actual="${endcolor}";;

      *)                clr_actual="${endcolor}";;
    esac
  fi

  if [ $# -eq 2 ]; then
    echo -en "${clr_actual}${clr_text}${endcolor}"
  else
    echo -en "${clr_actual}"
  fi
}

# print build progress messages
# param1: message color, p2: label, p3: text, p4: indent (optional)
build_msg() {
  local spaces

  [ -n "${BUILD_INDENT}" ] && spaces="$(printf "%${BUILD_INDENT}c" " ")" || spaces=""

  if [ -n "${3}" ]; then
    echo -e "${spaces}$(print_color "${1}" "${2}")      ${3}" >&${SILENT_OUT}
  else
    echo -e "${spaces}$(print_color "${1}" "${2}")" >&${SILENT_OUT}
  fi

  # pad left space to create "indent" effect
  if [ "${4}" = "indent" ]; then
    export BUILD_INDENT=$((${BUILD_INDENT:-0}+${BUILD_INDENT_SIZE}))
  elif [ -n "${4}" ]; then
    die "ERROR: ${0} unexpected parameter: ${4}"
  fi
}

# prints a warning if the file slated for removal doesn't exist
# this allows us to continue instead of bailing out with just "rm"
safe_remove() {
  local path

  for path in "$@" ; do
    if [ -e "${path}" -o -L "${path}" ]; then
      rm -r "${path}"
    elif [ -n "${PKG_NAME}" ]; then
      print_color CLR_WARNING "safe_remove: path does not exist: [${PKG_NAME}]: ${path}\n"
    else
      print_color CLR_WARNING "safe_remove: path does not exist: ${path}\n"
    fi
  done
}

### BUILDSYSTEM HELPERS ###
# check if a flag is enabled
# $1: flag-name, $2: default (yes/no), $3: ingenious check (none,only-disable,only-enable)
# return 0 if flag is enabled, otherwise 1
flag_enabled() {
  # check flag
  if [ -n "${PKG_BUILD_FLAGS}" ] && listcontains "${PKG_BUILD_FLAGS}" "[+]?$1"; then
    if [ "${3:none}" = "only-disable" ]; then
      die "ERROR: $1 cannot enable via PKG_BUILD_FLAGS (found in $PKG_NAME)"
    fi
    return 0
  elif [ "$2" = "yes" ] && ! listcontains "${PKG_BUILD_FLAGS}" "-$1"; then
    return 0
  else
    if [ "${3:none}" = "only-enable" ]; then
      die "ERROR: $1 cannot disable via PKG_BUILD_FLAGS (found in $PKG_NAME)"
    fi
    return 1
  fi
}

setup_pkg_config_target() {
  export PKG_CONFIG="$TOOLCHAIN/bin/pkg-config"
  export PKG_CONFIG_PATH=""
  export PKG_CONFIG_LIBDIR="$SYSROOT_PREFIX/usr/lib/pkgconfig:$SYSROOT_PREFIX/usr/share/pkgconfig"
  export PKG_CONFIG_SYSROOT_BASE="$BUILD"
  export PKG_CONFIG_SYSROOT_DIR="$SYSROOT_PREFIX"
  export PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=1
  export PKG_CONFIG_ALLOW_SYSTEM_LIBS=1
}

setup_pkg_config_host() {
  export PKG_CONFIG="$TOOLCHAIN/bin/pkg-config"
  export PKG_CONFIG_PATH=""
  export PKG_CONFIG_LIBDIR="$TOOLCHAIN/lib/pkgconfig:$TOOLCHAIN/share/pkgconfig"
  export PKG_CONFIG_SYSROOT_BASE=""
  export PKG_CONFIG_SYSROOT_DIR=""
  unset PKG_CONFIG_ALLOW_SYSTEM_CFLAGS
  unset PKG_CONFIG_ALLOW_SYSTEM_LIBS
}

setup_toolchain() {
  if [ "$LTO_SUPPORT" = "yes" ]; then
    if flag_enabled "lto-parallel" "no"; then
      TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
      TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
      TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_PARALLEL"
    elif flag_enabled "lto-fat" "no"; then
      TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_FAT"
      TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_FAT"
      TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_NO_PARALLEL"
    elif flag_enabled "lto" "no"; then
      TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
      TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
      TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_NO_PARALLEL"
    fi
  fi

  if flag_enabled "lto-off" "no"; then
    TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
    TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
    TARGET_LDFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
  fi

  # gold flag
  if flag_enabled "gold" "$GOLD_SUPPORT" "only-disable"; then
    TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_GOLD"
  fi

  # compiler optimization, descending priority: speed, size, default
  if [ "${BUILD_WITH_DEBUG}" = "yes" ]; then
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_DEBUG"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_DEBUG"
    TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_DEBUG"
  elif flag_enabled "speed" "no"; then
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_SPEED"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_SPEED"
  elif flag_enabled "size" "no"; then
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_SIZE"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_SIZE"
  else
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_DEFAULT"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_DEFAULT"
  fi

  # position-independent code
  if flag_enabled "pic" "no"; then
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_PIC"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_PIC"
    TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_PIC"
  fi
  if flag_enabled "pic:host" "no"; then
    HOST_CFLAGS+=" $CFLAGS_OPTIM_PIC"
    HOST_CXXFLAGS+=" $CXXFLAGS_OPTIM_PIC"
    HOST_LDFLAGS+=" $LDFLAGS_OPTIM_PIC"
  fi

  # hardening support
  if flag_enabled "hardening" "$HARDENING_SUPPORT"; then
    TARGET_CFLAGS+=" $CFLAGS_OPTIM_HARDENING"
    TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_HARDENING"
    TARGET_CFLAGS+=" $CPPFLAGS_OPTIM_HARDENING"
    TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_HARDENING"
  fi

  # parallel
  if flag_enabled "parallel" "yes"; then
    NINJA_OPTS="-j$CONCURRENCY_MAKE_LEVEL"
    MAKEFLAGS="-j$CONCURRENCY_MAKE_LEVEL"
  else
    NINJA_OPTS="-j1"
    MAKEFLAGS="-j1"
  fi

  # verbose flag
  if flag_enabled "verbose" "no"; then
    NINJA_OPTS+=" -v"
    MAKEFLAGS+=" V=1 VERBOSE=1"
  fi

  # average load limit
  if [ "${CONCURRENCY_LOAD}" != "0" ]; then
    NINJA_OPTS+=" -l${CONCURRENCY_LOAD}"
    MAKEFLAGS+=" -l${CONCURRENCY_LOAD}"
  fi
  export MAKEFLAGS

  case "$1:$2" in
    target:meson)
      export DESTIMAGE="target"
      export AWK="gawk"
      export CC="$TOOLCHAIN/bin/host-gcc"
      export CXX="$TOOLCHAIN/bin/host-g++"
      export CPP="cpp"
      export LD="ld"
      export AS="as"
      export AR="ar"
      export NM="nm"
      export RANLIB="ranlib"
      export OBJCOPY="objcopy"
      export OBJDUMP="objdump"
      export STRIP="strip"
      export CPPFLAGS="$HOST_CPPFLAGS"
      export CFLAGS="$HOST_CFLAGS"
      export CXXFLAGS="$HOST_CXXFLAGS"
      export LDFLAGS="$HOST_LDFLAGS"
      setup_pkg_config_target
      export TARGET_CC="${TARGET_PREFIX}gcc"
      export TARGET_CXX="${TARGET_PREFIX}g++"
      export TARGET_AR="${TARGET_PREFIX}ar"
      export TARGET_STRIP="${TARGET_PREFIX}strip"
      export TARGET_CFLAGS="$TARGET_CFLAGS"
      export TARGET_CXXFLAGS="$TARGET_CXXFLAGS"
      export TARGET_LDFLAGS="$TARGET_LDFLAGS"
      export HOST_CC="$CC"
      export HOST_CXX="$CXX"
      export HOSTCC="$CC"
      export HOSTCXX="$CXX"
      export CC_FOR_BUILD="$CC"
      export CXX_FOR_BUILD="$CXX"
      export BUILD_CC="$CC"
      export BUILD_CXX="$CXX"
      export _python_sysroot="$SYSROOT_PREFIX"
      export _python_prefix=/usr
      export _python_exec_prefix=/usr
      ;;

    target:*|init:*)
      export DESTIMAGE="target"
      export CC="${TARGET_PREFIX}gcc"
      export CXX="${TARGET_PREFIX}g++"
      export CPP="${TARGET_PREFIX}cpp"
      export LD="${TARGET_PREFIX}ld"
      export AS="${TARGET_PREFIX}as"
      export AR="${TARGET_PREFIX}ar"
      export NM="${TARGET_PREFIX}nm"
      export RANLIB="${TARGET_PREFIX}ranlib"
      export OBJCOPY="${TARGET_PREFIX}objcopy"
      export OBJDUMP="${TARGET_PREFIX}objdump"
      export STRIP="${TARGET_PREFIX}strip"
      export CPPFLAGS="$TARGET_CPPFLAGS"
      export CFLAGS="$TARGET_CFLAGS"
      export CXXFLAGS="$TARGET_CXXFLAGS"
      export LDFLAGS="$TARGET_LDFLAGS"
      setup_pkg_config_target
      export CMAKE_CONF=$TOOLCHAIN/etc/cmake-$TARGET_NAME.conf
      export CMAKE="cmake -DCMAKE_TOOLCHAIN_FILE=$CMAKE_CONF -DCMAKE_INSTALL_PREFIX=/usr"
      if [ ! -f $CMAKE_CONF ] ; then
        mkdir -p $TOOLCHAIN/etc
        echo "SET(CMAKE_SYSTEM_NAME Linux)" >> $CMAKE_CONF
        echo "SET(CMAKE_SYSTEM_VERSION 1)"  >> $CMAKE_CONF
        echo "SET(CMAKE_SYSTEM_PROCESSOR  $TARGET_ARCH)" >> $CMAKE_CONF
        echo "SET(CMAKE_C_COMPILER   $CC)"  >> $CMAKE_CONF
        echo "SET(CMAKE_CXX_COMPILER $CXX)" >> $CMAKE_CONF
        echo "SET(CMAKE_CPP_COMPILER $CPP)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH  $SYSROOT_PREFIX)"   >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)"  >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)"  >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)"  >> $CMAKE_CONF
        if [ "${DISPLAYSERVER}" = "x11" ]; then
          if [ "${OPENGL}" = "mesa" ] || listcontains "${GRAPHIC_DRIVERS}" "nvidia"; then
            echo "SET(OpenGL_GL_PREFERENCE GLVND)" >> $CMAKE_CONF
          fi
        fi
      fi
      export HOST_CC="$TOOLCHAIN/bin/host-gcc"
      export HOST_CXX="$TOOLCHAIN/bin/host-g++"
      export HOSTCC="$HOST_CC"
      export HOSTCXX="$HOST_CXX"
      export CC_FOR_BUILD="$HOST_CC"
      export CXX_FOR_BUILD="$HOST_CXX"
      export BUILD_CC="$HOST_CC"
      export BUILD_CXX="$HOST_CXX"
      export _python_sysroot="$SYSROOT_PREFIX"
      export _python_prefix=/usr
      export _python_exec_prefix=/usr
      ;;
    host:*|bootstrap:*)
      export DESTIMAGE="host"
      export AWK="gawk"
      export CC="$TOOLCHAIN/bin/host-gcc"
      export CXX="$TOOLCHAIN/bin/host-g++"
      export CPP="cpp"
      export LD="ld"
      export AS="as"
      export AR="ar"
      export NM="nm"
      export RANLIB="ranlib"
      export OBJCOPY="objcopy"
      export OBJDUMP="objdump"
      export STRIP="strip"
      export CPPFLAGS="$HOST_CPPFLAGS"
      export CFLAGS="$HOST_CFLAGS"
      export CXXFLAGS="$HOST_CXXFLAGS"
      export LDFLAGS="$HOST_LDFLAGS"
      setup_pkg_config_host
      export CMAKE_CONF=$TOOLCHAIN/etc/cmake-$HOST_NAME.conf
      export CMAKE="cmake -DCMAKE_TOOLCHAIN_FILE=$CMAKE_CONF -DCMAKE_INSTALL_PREFIX=$TOOLCHAIN"
      if [ ! -f $CMAKE_CONF ] ; then
        mkdir -p $TOOLCHAIN/etc
        echo "SET(CMAKE_SYSTEM_NAME Linux)" >> $CMAKE_CONF
        echo "SET(CMAKE_SYSTEM_VERSION 1)"  >> $CMAKE_CONF
        echo "SET(CMAKE_SYSTEM_PROCESSOR ${MACHINE_HARDWARE_NAME})" >> $CMAKE_CONF
        echo "SET(CMAKE_C_COMPILER   $CC)"  >> $CMAKE_CONF
        echo "SET(CMAKE_CXX_COMPILER $CXX)" >> $CMAKE_CONF
        echo "SET(CMAKE_CPP_COMPILER $CXX)" >> $CMAKE_CONF
        echo "SET(CMAKE_AR $AR CACHE FILEPATH "Archiver")" >> $CMAKE_CONF # hum?
        echo "SET(CMAKE_FIND_ROOT_PATH  $TOOLCHAIN)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM BOTH)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)" >> $CMAKE_CONF
        echo "SET(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE BOTH)" >> $CMAKE_CONF
      fi
      export HOST_CC="$CC"
      export HOST_CXX="$CXX"
      export HOSTCC="$CC"
      export HOSTCXX="$CXX"
      export CC_FOR_BUILD="$CC"
      export CXX_FOR_BUILD="$CXX"
      export BUILD_CC="$CC"
      export BUILD_CXX="$CXX"
      export _python_sysroot="$TOOLCHAIN"
      export _python_prefix=/
      export _python_exec_prefix=/
      ;;
  esac
}

create_meson_conf_host() {
  local properties
  properties="PKG_MESON_PROPERTIES_${1^^}"

  cat > $2 <<EOF
[binaries]
c = '$CC'
cpp = '$CXX'
ar = '$AR'
strip = '$STRIP'
pkgconfig = '$PKG_CONFIG'
llvm-config = '$TOOLCHAIN/bin/llvm-config-host'
libgcrypt-config = '$SYSROOT_PREFIX/usr/bin/libgcrypt-config'

[host_machine]
system = 'linux'
cpu_family = '$TARGET_ARCH'
cpu = '$TARGET_SUBARCH'
endian = 'little'

[properties]
root = '$TOOLCHAIN'
$(python3 -c "import os; print('c_args = {}'.format([x for x in os.getenv('CFLAGS').split()]))")
$(python3 -c "import os; print('c_link_args = {}'.format([x for x in os.getenv('LDFLAGS').split()]))")
$(python3 -c "import os; print('cpp_args = {}'.format([x for x in os.getenv('CXXFLAGS').split()]))")
$(python3 -c "import os; print('cpp_link_args = {}'.format([x for x in os.getenv('LDFLAGS').split()]))")
${!properties}
EOF
}

create_meson_conf_target() {
  local properties
  properties="PKG_MESON_PROPERTIES_${1^^}"

  cat > $2 <<EOF
[binaries]
c = '$TARGET_CC'
cpp = '$TARGET_CXX'
ar = '$TARGET_AR'
strip = '$TARGET_STRIP'
pkgconfig = '$PKG_CONFIG'
llvm-config = '$TOOLCHAIN/bin/llvm-config-host'
libgcrypt-config = '$SYSROOT_PREFIX/usr/bin/libgcrypt-config'

[host_machine]
system = 'linux'
cpu_family = '$TARGET_ARCH'
cpu = '$TARGET_SUBARCH'
endian = 'little'

[properties]
root = '$SYSROOT_PREFIX/usr'
$(python3 -c "import os; print('c_args = {}'.format([x for x in os.getenv('TARGET_CFLAGS').split()]))")
$(python3 -c "import os; print('c_link_args = {}'.format([x for x in os.getenv('TARGET_LDFLAGS').split()]))")
$(python3 -c "import os; print('cpp_args = {}'.format([x for x in os.getenv('TARGET_CXXFLAGS').split()]))")
$(python3 -c "import os; print('cpp_link_args = {}'.format([x for x in os.getenv('TARGET_LDFLAGS').split()]))")
${!properties}
EOF
}


# unset all PKG_* vars apart from those exported by setup_toolchain, then set default values
reset_pkg_vars() {
  local vars var

  for var in ${!PKG_*}; do
    if [ "${var}" = "PKG_CONFIG" ] || \
       [ "${var}" = "PKG_CONFIG_PATH" ] || \
       [ "${var}" = "PKG_CONFIG_LIBDIR" ] || \
       [ "${var}" = "PKG_CONFIG_SYSROOT_BASE" ] || \
       [ "${var}" = "PKG_CONFIG_SYSROOT_DIR" ] || \
       [ "${var}" = "PKG_CONFIG_ALLOW_SYSTEM_CFLAGS" ] || \
       [ "${var}" = "PKG_CONFIG_ALLOW_SYSTEM_LIBS" ]; then
       continue
    fi
    vars+="${var} "
  done
  [ -n "${vars}" ] && unset -v ${vars}

  PKG_VERSION="0.0invalid"
  PKG_REV="0"
  PKG_ARCH="any"
  PKG_LICENSE="unknown"
  PKG_TOOLCHAIN="auto"
  PKG_IS_ADDON="no"
  PKG_PYTHON_VERSION="${DEFAULT_PYTHON_VERSION}"
}

set_debug_depends() {
  local pkg dep_pkg map tmp_array mpkg bpkg kvpair

  _DEBUG_DEPENDS_LIST=""
  _DEBUG_PACKAGE_LIST=""
  if [ "${DEBUG:-no}" != "no" ]; then
    # Convert DEBUG_GROUPS into array of groups, adding "all" if required
    declare -A debug_group_map
    for kvpair in ${DEBUG_GROUPS}; do
      debug_group_map+=(["${kvpair%=*}"]="${kvpair#*=}")
    done
    [ -z "${debug_group_map["all"]}" ] && debug_group_map+=(["all"]="all")

    # Expand $DEBUG into $_DEBUG_PACKAGE_LIST
    for pkg in ${DEBUG//,/ }; do
      [ "${pkg}" = "yes" ] && pkg="${DEBUG_GROUP_YES:-all}"
      map="${debug_group_map["${pkg}"]}"
      [ -z "${map}" ] && map="${pkg}"
      for mpkg in ${map//,/ }; do
        [[ ${mpkg} =~ ^[!-] ]] && bpkg="${mpkg:1}" || bpkg="${mpkg}"
        [[ ${bpkg} =~ \+$ ]] && bpkg="${bpkg::-1}"
        # Remove existing instances of this package
        listcontains "${_DEBUG_PACKAGE_LIST}" "[!-]?${bpkg}[+]?" && _DEBUG_PACKAGE_LIST="$(listremoveitem "${_DEBUG_PACKAGE_LIST}" "[!-]?${bpkg}[+]?")"
        # Add package
        _DEBUG_PACKAGE_LIST+=" ${mpkg}"
      done
    done
    # Use array word splitting to squash spaces
    tmp_array=(${_DEBUG_PACKAGE_LIST})
    _DEBUG_PACKAGE_LIST="${tmp_array[@]}"

    # Determine dependencies for each package+
    for pkg in ${_DEBUG_PACKAGE_LIST}; do
      if [ "${pkg}" != "all" ] && [[ ! ${pkg} =~ ^[!-] ]]; then
        ! listcontains "${_DEBUG_DEPENDS_LIST}" "${pkg}" && _DEBUG_DEPENDS_LIST+=" ${pkg}"
        [[ ! ${pkg} =~ \+$ ]] && continue
        for dep_pkg in $(get_pkg_variable ${pkg::-1} PKG_DEPENDS_TARGET); do
          [ "${dep_pkg}" = "toolchain" ] && continue
          [[ ${dep_pkg} =~ ^.*:host$ ]] && continue
          ! listcontains "${_DEBUG_DEPENDS_LIST}" "${dep_pkg}" && _DEBUG_DEPENDS_LIST+=" ${dep_pkg}"
        done
      fi
    done
    tmp_array=(${_DEBUG_DEPENDS_LIST})
    _DEBUG_DEPENDS_LIST="${tmp_array[@]}"
  fi
  export _DEBUG_DEPENDS_LIST _DEBUG_PACKAGE_LIST
}

# Return 0 if building with debug is enabled for the current package (or all packages).
# Examples: DEBUG=yes  DEBUG=all  DEBUG='all,!linux'  DEBUG=kodi  DEBUG=kodi,samba
build_with_debug() {
  if [ "${DEBUG:-no}" != "no" -a -n "${PKG_NAME}" -a -n "${_DEBUG_DEPENDS_LIST+x}" ]; then
    # Return 1 if this package is not to be built with debug
    listcontains "${_DEBUG_PACKAGE_LIST}" "[!-]${PKG_NAME}[+]?" && return 1

    # Build all packages with debug
    listcontains "${_DEBUG_PACKAGE_LIST}" "all" && return 0

    # Debugging is enabled for at least one package, so enable debug in the "debug" virtual package
    [ "${PKG_NAME}" = "debug" ] && return 0

    # Build addons with debug if we're building the mediacenter with debug and with dependencies
    [ "${PKG_IS_ADDON}" = "yes" -o "${PKG_IS_ADDON}" = "embedded" ] && listcontains "${_DEBUG_DEPENDS_LIST}" "${MEDIACENTER}\+" && return 0

    # Build kernel packages with debug if we're building the kernel with debug and with dependencies
    [ "${PKG_IS_KERNEL_PKG}" = "yes" ] && listcontains "${_DEBUG_DEPENDS_LIST}" "linux\+" && return 0

    # Build this package with debug if it's a resolved dependency
    listcontains "${_DEBUG_DEPENDS_LIST}" "${PKG_NAME}" && return 0
  fi

  return 1
}

# strip
debug_strip() {
  if [ -z "${BUILD_WITH_DEBUG}" ]; then
    die "ERROR: debug_strip() must not be called without configuring BUILD_WITH_DEBUG"
  fi

  if [ "${BUILD_WITH_DEBUG}" != "yes" ] && flag_enabled "strip" "yes"; then
    find $* -type f -executable | xargs $STRIP 2>/dev/null || :
  fi
}

init_package_cache() {
  local _ANCHOR="@?+?@"
  local temp_global temp_local

  # If the package caches are unset, then populate them
  if [ -z "${_CACHE_PACKAGE_LOCAL}" -o -z "${_CACHE_PACKAGE_GLOBAL}" ]; then
    temp_global="$(mktemp)"
    temp_local="$(mktemp)"

    # cache project/device folder for packages
    if [ -n "${DEVICE}" ]; then
      find "${ROOT}/projects/${PROJECT}/devices/${DEVICE}/packages" -type f -name package.mk 2>/dev/null | sed "s#/package\.mk\$#${_ANCHOR}#" >> "${temp_local}"
    fi

    # cache project folder for packages
    find "${ROOT}/projects/${PROJECT}/packages" -type f -name package.mk 2>/dev/null | sed "s#/package\.mk\$#${_ANCHOR}#" >> "${temp_local}"

    # cache packages folder
    find "${ROOT}/${PACKAGES}" -type f -name package.mk 2>/dev/null | sed "s#/package\.mk\$#${_ANCHOR}#" >> "${temp_global}"

    _CACHE_PACKAGE_LOCAL="${BUILD}/.cache_package_local"
    _CACHE_PACKAGE_GLOBAL="${BUILD}/.cache_package_global"
    export _CACHE_PACKAGE_LOCAL _CACHE_PACKAGE_GLOBAL

    # overwrite existing cache files only when they are invalid, or not yet created
    mkdir -p "$(dirname "${_CACHE_PACKAGE_GLOBAL}")"
    if [ -f "${_CACHE_PACKAGE_LOCAL}" ] && cmp -s "${temp_local}" "${_CACHE_PACKAGE_LOCAL}"; then
      rm "${temp_local}"
    else
      mv "${temp_local}" "${_CACHE_PACKAGE_LOCAL}"
    fi
    if [ -f "${_CACHE_PACKAGE_GLOBAL}" ] && cmp -s "${temp_global}" "${_CACHE_PACKAGE_GLOBAL}"; then
      rm "${temp_global}"
    else
      mv "${temp_global}" "${_CACHE_PACKAGE_GLOBAL}"
    fi
  fi

  if [ -z "${_DEBUG_DEPENDS_LIST+x}" ]; then
    set_debug_depends
  fi
}

load_build_config() {
  if [ -d "${1}" -a -f ${1}/.build.conf ]; then
    source ${1}/.build.conf
    return 0
  fi
  return 1
}

save_build_config() {
  local var
  mkdir -p ${BUILD}
  rm -f ${BUILD}/.build.conf
  for var in PROJECT DEVICE ARCH DEBUG BUILD_SUFFIX; do
    echo "export ${var}=\"${!var}\"" >> ${BUILD}/.build.conf
  done
}

check_path() {
  local dashes="===========================" path_err_msg
  if [ "${PWD##/usr}" != "${PWD}" ]; then
    path_err_msg="\n $dashes$dashes$dashes"
    path_err_msg="${path_err_msg}\n ERROR: Detected building inside /usr"
    path_err_msg="${path_err_msg}\n $dashes$dashes$dashes"
    path_err_msg="${path_err_msg}\n This is not supported with our buildsystem."
    path_err_msg="${path_err_msg}\n Please use another dir (for example your \$HOME) to build ${DISTRONAME}"

    die "${path_err_msg}"
  fi
}

check_distro() {
  local dashes="===========================" distro_err_msg
  if [ -z "${DISTRO}" -o ! -d "${DISTRO_DIR}/${DISTRO}" ]; then
    distro_err_msg="\n $dashes$dashes$dashes"
    distro_err_msg="${distro_err_msg}\n ERROR: Distro not found, use a valid distro or create a new config"
    distro_err_msg="${distro_err_msg}\n $dashes$dashes$dashes"
    distro_err_msg="${distro_err_msg}\n\n Valid distros:"

    for distros in ${DISTRO_DIR}/*; do
      distro_err_msg="${distro_err_msg}\n - ${distros##*/}"
    done
    die "${distro_err_msg}"
  fi
}

check_project() {
  local dashes="===========================" project_err_msg
  if [ -z "${PROJECT}" -o ! -d "${PROJECT_DIR}/${PROJECT}" ]; then
    project_err_msg="\n $dashes$dashes$dashes"
    project_err_msg="${project_err_msg}\n ERROR: Project not found, use a valid project or create a new config"
    project_err_msg="${project_err_msg}\n $dashes$dashes$dashes"
    project_err_msg="${project_err_msg}\n\n Valid projects:"

    for projects in ${PROJECT_DIR}/*; do
      project_err_msg="${project_err_msg}\n - ${projects##*/}"
    done
    die "${project_err_msg}"
  fi
}

check_device() {
  local dashes="===========================" device_err_msg
  if [ \( -z "${DEVICE}" -a -d "${PROJECT_DIR}/${PROJECT}/devices" \) -o \
       \( -n "${DEVICE}" -a ! -d "${PROJECT_DIR}/${PROJECT}/devices/${DEVICE}" \) ]; then
    device_err_msg="\n $dashes$dashes$dashes"
    device_err_msg="${device_err_msg}\n ERROR: You need to specify a valid device for the $PROJECT project"
    device_err_msg="${device_err_msg}\n $dashes$dashes$dashes"
    device_err_msg="${device_err_msg}\n\n Valid devices for project: ${PROJECT}"

    for device in ${PROJECT_DIR}/${PROJECT}/devices/*; do
      device_err_msg="${device_err_msg}\n - ${device##*/}"
    done
    die "${device_err_msg}"
  fi
}

check_arch() {
  local dashes="===========================" arch_err_msg linux_config_dir
  if [ -d "${PROJECT_DIR}/${PROJECT}/devices/${DEVICE}/linux" ]; then
    linux_config_dir="${PROJECT_DIR}/${PROJECT}/devices/$DEVICE/linux"
  else
    linux_config_dir="${PROJECT_DIR}/${PROJECT}/linux"
  fi

  if [ ! -e "$linux_config_dir/linux.${TARGET_PATCH_ARCH:-$TARGET_ARCH}.conf" ] &&
       ! ls "$linux_config_dir/"*/linux.${TARGET_PATCH_ARCH:-$TARGET_ARCH}.conf &>/dev/null; then
    arch_err_msg="\n $dashes$dashes$dashes"
    arch_err_msg="${arch_err_msg}\n ERROR: Architecture not found, use a valid Architecture"
    arch_err_msg="${arch_err_msg}\n for your project or create a new config"
    arch_err_msg="${arch_err_msg}\n $dashes$dashes$dashes"
    arch_err_msg="${arch_err_msg}\n\n Valid Architectures for your project: ${PROJECT}"

    for arch in $linux_config_dir/*.conf $linux_config_dir/*/linux.$TARGET_ARCH.conf; do
      [[ ${arch} =~ .*\*.* ]] && continue #ignore unexpanded wildcard
      arch_err_msg="${arch_err_msg}\n - $(basename $arch | cut -f2 -d".")"
    done
    die "${arch_err_msg}"
  fi
}

check_config() {
  check_path
  check_distro
  check_project
  check_device
  check_arch
}

do_autoreconf() {
  export ACLOCAL_DIR=$SYSROOT_PREFIX/usr/share/aclocal

  if [ -e "$TOOLCHAIN/bin/autoconf" ]; then
    export AUTOCONF=$TOOLCHAIN/bin/autoconf
  fi

  if [ -e "$TOOLCHAIN/bin/automake" ]; then
    export AUTOMAKE=$TOOLCHAIN/bin/automake
  fi

  if [ -e "$TOOLCHAIN/bin/autopoint" ]; then
    export AUTOPOINT=$TOOLCHAIN/bin/autopoint
  fi

  if [ -e "$TOOLCHAIN/bin/libtoolize" ]; then
    export LIBTOOLIZE=$TOOLCHAIN/bin/libtoolize
  fi

  if [ -e "$TOOLCHAIN/bin/intltoolize" ]; then
    export INTLTOOLIZE=$TOOLCHAIN/bin/intltoolize
  fi

  if [ -e "$TOOLCHAIN/bin/aclocal" ]; then
    export ACLOCAL="$TOOLCHAIN/bin/aclocal -I $ACLOCAL_DIR"
  fi

  if [ -e "$TOOLCHAIN/bin/autoheader" ]; then
    export AUTOHEADER=$TOOLCHAIN/bin/autoheader
  fi

  if [ -e "$TOOLCHAIN/bin/libtool" ]; then
    export LIBTOOL=$TOOLCHAIN/bin/libtool
  fi

  if [ -e "$TOOLCHAIN/bin/autoreconf" -a -e "$INTLTOOLIZE" ]; then
    mkdir -p $ACLOCAL_DIR
    if [ -e "$LIBTOOLIZE" ]; then
      export AUTORECONF="$TOOLCHAIN/bin/autoreconf --verbose --force --install -I $ACLOCAL_DIR"
    else
      export AUTORECONF="$TOOLCHAIN/bin/autoreconf --verbose --force -I $ACLOCAL_DIR"
    fi
    $AUTORECONF $@
  fi
}

# True if this is a sequential build, false if multithreaded
is_sequential_build() {
  [ "${MTWITHLOCKS}" != "yes" ] && return 0 || return 1
}


### PACKAGE HELPERS ###
# get variable ($2) for package ($1).
# avoid infinite recursion if required package is already loaded.
get_pkg_variable() {
  if [ -n "$1" -a -n "$2" ] ; then
    if [ "$1" != "$PKG_NAME" ]; then
      source_package "${1}"
    fi
    echo "${!2}"
  fi
}

# get package's build dir
get_build_dir() {
  local _PKG_NAME="${1%:*}" _PKG_VERSION="$(get_pkg_version "$1")"
  if [ -n "$_PKG_NAME" -a -n "$_PKG_VERSION" ]; then
    echo $BUILD/build/${_PKG_NAME}-${_PKG_VERSION}
  fi
}

get_install_dir() {
  get_pkg_variable "$1" PKG_INSTALL
}

get_pkg_version() {
  get_pkg_variable "$1" PKG_VERSION
}

get_pkg_version_maj_min() {
  local pkg_version

  [ -n "${1}" ] && pkg_version="$(get_pkg_version "${1}")" || pkg_version="${PKG_VERSION}"

  if [[ ${pkg_version} =~ ^[0-9A-Za-z]*\.[0-9A-Za-z]*\.[0-9A-za-z]*$ ]]; then
    echo "${pkg_version%.*}"
  elif [[ ${pkg_version} =~ ^[0-9A-Za-z]*\.[0-9A-Za-z]*$ ]]; then
    echo "${pkg_version}"
  else
    echo "${pkg_version}"
  fi
}

get_pkg_directory() {
  local _PKG_ROOT_NAME=${1%:*} _ALL_DIRS _FOUND=0 _ANCHOR="@?+?@" _PKG_DIR _DIR

  # Check for any available local package in preference to a global package
  for _DIR in $(grep -F "/${_PKG_ROOT_NAME}${_ANCHOR}" "${_CACHE_PACKAGE_LOCAL}"); do
    _DIR="${_DIR%${_ANCHOR}}"
    # found first, set $_PKG_DIR
    _PKG_DIR="$_DIR"
    # keep track of dirs with package.mk for detecting multiple folders
    _ALL_DIRS+="${_DIR}\n"
    _FOUND=$((_FOUND+1))
  done

  # If there's no local package available, use the global package
  if [ $_FOUND -eq 0 ]; then
    for _DIR in $(grep -F "/${_PKG_ROOT_NAME}${_ANCHOR}" "${_CACHE_PACKAGE_GLOBAL}"); do
      _DIR="${_DIR%${_ANCHOR}}"
      # found first, set $_PKG_DIR
      _PKG_DIR="$_DIR"
      # keep track of dirs with package.mk for detecting multiple folders
      _ALL_DIRS+="${_DIR}\n"
      _FOUND=$((_FOUND+1))
    done
  fi

  # _FOUND multiple packages? fail
  if [ $_FOUND -gt 1 ]; then
    echo "Error - multiple package folders for package ${_PKG_ROOT_NAME}:" >&2
    echo -e "$_ALL_DIRS" >&2
    die
  fi

  echo "$_PKG_DIR"
}

# Return a list of sorted package names for this project/device/arch
get_all_package_names() {
  sed -e 's#@?+?@##g; s#.*/##g' ${_CACHE_PACKAGE_GLOBAL} ${_CACHE_PACKAGE_LOCAL} | sort --ignore-case --unique
}

calculate_stamp() {
  local stamp data

  stamp="$PKG_DIR $PROJECT_DIR/$PROJECT/patches/$PKG_NAME $PROJECT_DIR/$PROJECT/packages/$PKG_NAME"
  [ -n "$DEVICE" ] && stamp+=" $PROJECT_DIR/$PROJECT/devices/$DEVICE/patches/$PKG_NAME"
  [ -n "$PKG_NEED_UNPACK" ] && stamp+=" $PKG_NEED_UNPACK"

  data="$(find -L ${stamp} -type f -not -name '.*' 2>/dev/null | sed "s|^${ROOT}/||" | LC_ALL=C sort -u | xargs sha256sum)"
  [ -n "${PKG_STAMP}" ] && data+=$'\n'"$(echo "${PKG_STAMP}" | sha256sum)"

  echo "${data}" | sha256sum | cut -d" " -f1
}

target_has_feature() {
  listcontains "$TARGET_FEATURES" "$1"
}

# find path for matching file or directory, searching standard directory hierarchy, using optional default
# if a path is located it will be set in FOUND_PATH and exit code will be 0.
find_path() {
  local test_func="$1" search="$2" default="$3"
  local dir match wildcard=0 ftype

  # support wildcard matches
  [[ $search =~ \* || $search =~ \? ]] && wildcard=1

  [ "$test_func" = "-f" ] && ftype="file" || ftype="dir"

  for dir in $PROJECT_DIR/$PROJECT/devices/$DEVICE/packages/$PKG_NAME \
             $PROJECT_DIR/$PROJECT/devices/$DEVICE \
             $PROJECT_DIR/$PROJECT/packages/$PKG_NAME \
             $PROJECT_DIR/$PROJECT \
             $DISTRO_DIR/$DISTRO/packages/$PKG_NAME \
             $DISTRO_DIR/$DISTRO \
             $PKG_DIR \
             ; do
    # ignore directories with missing DEVICE or PKG_NAME components
    [[ $dir =~ /packages/$ ]] && continue
    [[ $dir =~ /devices/$ ]] && continue
    [[ $dir =~ /devices//packages/$PKG_NAME$ ]] && continue

    if [ $wildcard -eq 1 ]; then
      ls $dir/$search 1>/dev/null 2>&1 && match="$dir/$search" && break
    else
      [ $test_func "$dir/$search" ] && match="$dir/$search" && break
    fi
  done

  if [ -z "$match" -a -n "$default" ]; then
    if [[ $default =~ \* || $default =~ \? ]]; then
      ls $default 1>/dev/null 2>&1 && match="$default"
    else
      [ $test_func "$default" ] && match="$default"
    fi
  fi

  if [ -n "$match" ]; then
    FOUND_PATH="$match"
    [ "${VERBOSE_FIND_PATH,,}" = "yes" ] && echo "find_path: Searching for $ftype: \"$search\", found: \"$FOUND_PATH\"" >&2
    return 0
  else
    unset FOUND_PATH
    [ "${VERBOSE_FIND_PATH,,}" = "yes" ] && echo "find_path: Searching for $ftype: \"$search\" - not found" >&2
    return 1
  fi
}

find_file_path() {
  find_path -f "$1" "$2"
}

find_dir_path() {
  find_path -d "$1" "$2"
}

# p1: name of function to test for
# return 0 if function exists, 1 if not
pkg_call_exists() {
  PKG_CURRENT_CALL="${1}"
  if [ "$(type -t ${1})" = "function" ]; then
    PKG_CURRENT_CALL_TYPE="package.mk"
    return 0
  else
    PKG_CURRENT_CALL_TYPE="default"
    return 1
  fi
}

# Optional variant of pkg_call_exists()
# Clear PKG_CURRENT_CALL when function is not implemented.
pkg_call_exists_opt() {
  if pkg_call_exists $1; then
    return 0
  else
    pkg_call_finish
    return 1
  fi
}

# Function to be called is set by pkg_call_exists/pkg_call_exists_opt
# Args: whatever the called function expects
# testing the exit code value of this function is likely to break set -e fail-on-error behaviour
pkg_call() {
  [ -n "${PKG_CURRENT_CALL}" ] || die "$(print_color CLR_ERROR "PKG_CURRENT_CALL is not set!")"
  [ -n "${PKG_NAME}" ] || die "$(print_color CLR_ERROR "FAILURE: Cannot call ${PKG_CURRENT_CALL} package function when package is not known!")"

  ${PKG_CURRENT_CALL} "${@}"
  pkg_call_finish
}

pkg_call_finish() {
  PKG_CURRENT_CALL=""
}

unset_functions() {
  local target

  unset -f configure_package

  unset -f pre_unpack unpack post_unpack
  unset -f pre_patch post_patch

  for target in target host init bootstrap; do
    unset -f pre_build_${target}
    unset -f pre_configure_${target} configure_${target} post_configure_${target}
    unset -f pre_make_${target} make_${target} post_make_${target}
    unset -f pre_makeinstall_${target} makeinstall_${target} post_makeinstall_${target}
  done

  unset -f pre_install post_install

  unset -f addon post_install_addon
}

# p1: name of package to be sourced
source_package() {
  local opwd="${PWD}"

  # Don't use BUILD_WITH_DEBUG in "global" package.mk - instead, call the function
  # build_with_debug() directly as the function depends on various package.mk
  # variables that will be in the process of being configured. Once package.mk is
  # fully sourced we can set this variable and use it in situations where we know the
  # package has already been sourced.
  unset BUILD_WITH_DEBUG

  reset_pkg_vars
  unset_functions

  if [ -n "${1}" ]; then
    [ -f "${1}" ] && PKG_DIR="$(dirname "${1}")" || PKG_DIR="$(get_pkg_directory "${1}")"

    [ -n "$PKG_DIR" -a -r $PKG_DIR/package.mk ] || die "FAILURE: unable to source package - ${1}/package.mk does not exist"

    cd "${ROOT}"
    . ${PKG_DIR}/package.mk || die "FAILURE: an error occurred while sourcing ${PKG_DIR}/package.mk"
    cd "${opwd}"

    PKG_SHORTDESC="${PKG_SHORTDESC:-${PKG_NAME} (autogenerated)}"
    PKG_LONGDESC="${PKG_LONGDESC:-${PKG_NAME} (autogenerated)}"

    if [ "$PKG_IS_ADDON" = "yes" -o "$PKG_IS_ADDON" = "embedded" ] ; then
      [ -z $PKG_SECTION ] && PKG_ADDON_ID="$PKG_NAME" || PKG_ADDON_ID="${PKG_SECTION//\//.}.$PKG_NAME"
      [ "$PKG_ADDON_IS_STANDALONE" != "yes" ] && PKG_NEED_UNPACK="${PKG_NEED_UNPACK} $(get_pkg_directory $MEDIACENTER)"
    fi

    if [ -n "${PKG_IS_KERNEL_PKG}" -a "${PKG_NAME}" != "linux" ]; then
      PKG_DEPENDS_TARGET="toolchain linux ${PKG_DEPENDS_TARGET}"
      PKG_DEPENDS_UNPACK="linux ${PKG_DEPENDS_UNPACK}"
      PKG_NEED_UNPACK="${LINUX_DEPENDS} ${PKG_NEED_UNPACK}"
    fi

    if [ -n "${PKG_DEPENDS_UNPACK}" ]; then
      for _p in ${PKG_DEPENDS_UNPACK}; do
        PKG_NEED_UNPACK+=" $(get_pkg_directory ${_p})"
      done
    fi

    # Automatically set PKG_SOURCE_NAME unless it is already defined.
    # PKG_SOURCE_NAME will be automatically set to a name based on
    # the $PKG_NAME-$PKG_VERSION convention.
    #
    # Any $PKG_URL that references more than a single url will abort
    # the build as these are no longer supported - use mkpkg instead.
    if [ -n "$PKG_URL" -a -z "$PKG_SOURCE_NAME" ]; then
      if [[ $PKG_URL =~ .*\ .* ]]; then
        echo "Error - packages with multiple urls are no longer supported, use mkpkg."
        echo "$PKG_URL"
        die
      fi
      if [[ ${PKG_URL} =~ .git$ || ${PKG_URL} =~ ^git:// ]]; then
        PKG_SOURCE_NAME=${PKG_NAME}-${PKG_VERSION}
      elif [[ ${PKG_URL} =~ ^file:// ]]; then
        PKG_SOURCE_NAME=${PKG_URL#file://}
        # if no specific PKG_TAR_COPY_OPTS then default to excluding .git and .svn as they can be huge
        [ -z "${PKG_TAR_COPY_OPTS+x}" ] && PKG_TAR_COPY_OPTS="--exclude=.git --exclude=.svn"
      else
        PKG_SOURCE_NAME="${PKG_URL##*/}"
        case $PKG_SOURCE_NAME in
          ${PKG_NAME}-${PKG_VERSION}.*)
            PKG_SOURCE_NAME=$PKG_SOURCE_NAME
            ;;
          *.tar | *.tbz | *.tgz | *.txz | *.7z | *.zip)
            PKG_SOURCE_NAME=${PKG_NAME}-${PKG_VERSION}.${PKG_SOURCE_NAME##*\.}
            ;;
          *.tar.bz2 | *.tar.gz | *.tar.xz)
            PKG_SOURCE_NAME=${PKG_NAME}-${PKG_VERSION}.tar.${PKG_SOURCE_NAME##*\.}
            ;;
          *.diff | *.patch | *.diff.bz2 | *.patch.bz2 | patch-*.bz2 | *.diff.gz | *.patch.gz | patch-*.gz)
            PKG_SOURCE_NAME=$PKG_SOURCE_NAME
            ;;
          *)
            PKG_SOURCE_NAME=${PKG_NAME}-${PKG_VERSION}.${PKG_SOURCE_NAME##*\.}
            ;;
        esac
      fi
    fi

    PKG_BUILD="$BUILD/build/${PKG_NAME}-${PKG_VERSION}"

    if [[ "${1}" =~ :target$ || "${1//:/}" = "${1}" ]]; then
      PKG_INSTALL="$BUILD/install_pkg/${PKG_NAME}-${PKG_VERSION}"
    elif [[ "${1}" =~ :init$ ]]; then
      PKG_INSTALL="$BUILD/install_init/${PKG_NAME}-${PKG_VERSION}"
    fi
  fi

  build_with_debug && BUILD_WITH_DEBUG="yes" || BUILD_WITH_DEBUG="no"

  # Late variable binding - allow the package to now evaluate any variables
  # that we may have initialised after sourcing the package, typically
  # PKG_BUILD etc.
  if [ -n "${PKG_NAME}" ]; then
    if pkg_call_exists_opt configure_package; then
      pkg_call
    fi
  fi
}

# arg1: file, or directory to recursively compile.
python_compile() {
  local path="${1:-${INSTALL}/usr/lib/${PKG_PYTHON_VERSION}}"
  ${TOOLCHAIN}/bin/python3 -Wi -t -B ${TOOLCHAIN}/lib/${PKG_PYTHON_VERSION}/compileall.py -f -d "${path#${INSTALL}}" "${path}"
  python_remove_source "${path}"
}

# arg1: file, or directory from which to recursively remove all py source code
python_remove_source() {
  local path="${1:-${INSTALL}/usr/lib/${PKG_PYTHON_VERSION}}"
  if [ -d "${path}" ]; then
    find "${path}" -type f -name '*.py' -delete
  else
    rm -f "${path}"
  fi
}

# arg1: directory to process recursively
# strip incorrect build-host ABI from native Python3 modules (see PEP3149)
python_fix_abi() {
  local pymodule pyname

  for pymodule in $(find ${1} -type f -name '*.cpython-*.so' 2>/dev/null); do
    pyname=${pymodule##*/}
    pyname=${pyname%.so} # strip extension
    pyname=${pyname%.*}  # strip incorrect ABI
    echo "python_fix_abi: Removing ABI from ${pymodule} -> ${pyname}.so"
    mv ${pymodule} ${pymodule%/*}/${pyname}.so
  done
}

### KERNEL HELPERS ###
kernel_path() {
  get_build_dir linux
}

kernel_version() {
  get_pkg_version linux
}

kernel_config_path() {
  local cfg pkg_linux_dir pkg_linux_version config_name

  pkg_linux_version="$(get_pkg_version linux)"
  pkg_linux_dir="$(get_pkg_directory linux)"

  config_name="linux.${TARGET_PATCH_ARCH:-$TARGET_ARCH}.conf"

  for cfg in $PROJECT_DIR/$PROJECT/devices/$DEVICE/linux/$pkg_linux_version/$config_name \
             $PROJECT_DIR/$PROJECT/devices/$DEVICE/linux/$LINUX/$config_name \
             $PROJECT_DIR/$PROJECT/devices/$DEVICE/linux/$config_name \
             $PROJECT_DIR/$PROJECT/linux/$pkg_linux_version/$config_name \
             $PROJECT_DIR/$PROJECT/linux/$LINUX/$config_name \
             $PROJECT_DIR/$PROJECT/linux/$config_name \
             $pkg_linux_dir/config/$pkg_linux_version/$config_name \
             $pkg_linux_dir/config/$LINUX/$config_name \
             $pkg_linux_dir/config/$config_name \
             ; do
    [[ $cfg =~ /devices//linux/ ]] && continue
    [ -f "$cfg" ] && echo "$cfg" && return
  done

  die "ERROR: Unable to locate kernel config for ${LINUX} - looking for ${config_name}"
}

kernel_make() {
  (
    setup_pkg_config_host

    LDFLAGS="" make CROSS_COMPILE=$TARGET_KERNEL_PREFIX \
      ARCH="$TARGET_KERNEL_ARCH" \
      HOSTCC="$TOOLCHAIN/bin/host-gcc" \
      HOSTCXX="$TOOLCHAIN/bin/host-g++" \
      HOSTCFLAGS="$HOST_CFLAGS" \
      HOSTLDFLAGS="$HOST_LDFLAGS" \
      HOSTCXXFLAGS="$HOST_CXXFLAGS" \
      DEPMOD="$TOOLCHAIN/bin/depmod" \
      "$@"
  )
}

# get kernel module dir
get_module_dir() {
  if [ -n "${_CACHED_KERNEL_MODULE_DIR}" ]; then
    echo "${_CACHED_KERNEL_MODULE_DIR}"
  else
    basename $(ls -d $(get_install_dir linux)/usr/lib/kernel-overlays/base/lib/modules/*)
  fi
}

# get base path to kernel modules and firmware
get_kernel_overlay_dir() {
  echo "usr/lib/kernel-overlays/${1:-base}"
}

# get full path to kernel module dir
# optional parameter specifies overlay level (default is base)
get_full_module_dir() {
  echo "$(get_kernel_overlay_dir $1)/lib/modules/$(get_module_dir)"
}

# get full path to firmware dir
# optional parameter specifies overlay level (default is base)
get_full_firmware_dir() {
  echo "$(get_kernel_overlay_dir $1)/lib/firmware"
}

fix_module_depends() {
  # modify .modinfo section in kernel module to depends on other required modules
  local MODULE="$1"
  local DEPENDS="$2"
  local OLD_DEPENDS=""
  cp ${MODULE} ${MODULE}_orig
  $OBJDUMP -s -j .modinfo ${MODULE}_orig | awk 'BEGIN{v=0;} /Contents/ {v=1; next;} {if (v==1) print $0;}' >new.modinfo1
  cat new.modinfo1 | cut -c7-41 | awk '{printf($0);}' | sed 's/ //g;s/../\\\x&/g;' >new.modinfo2
  /bin/echo -ne `cat new.modinfo2` | tr '\000' '\n' >new.modinfo3
  cat new.modinfo3 | awk '/^depends=/ {next;} {print $0;}' | tr '\n' '\000' >new.modinfo
  OLD_DEPENDS=$(awk '{FS="="} /depends=/ {print $2}' new.modinfo3)
  [ -n "$OLD_DEPENDS" ] && DEPENDS="$OLD_DEPENDS,$DEPENDS"
  /bin/echo -ne "depends=$DEPENDS\0" >>new.modinfo
  $OBJCOPY --remove-section=.modinfo --add-section=.modinfo=new.modinfo --set-section-flags .modinfo=contents,alloc,load,readonly,data ${MODULE}_orig ${MODULE}
  rm new.modinfo*
}


### ADDON HELPERS ###
install_binary_addon() {
  local addon_id="$1" addon_so

  mkdir -p $ADDON_BUILD/$addon_id/
  cp -R $PKG_INSTALL/usr/share/$MEDIACENTER/addons/$addon_id/* $ADDON_BUILD/$addon_id/

  addon_so=$(xmlstarlet sel -t -v "/addon/extension/@library_linux" $ADDON_BUILD/$addon_id/addon.xml || :)
  if [ -n "$addon_so" ]; then
    cp -L $PKG_INSTALL/usr/lib/$MEDIACENTER/addons/$addon_id/$addon_so $ADDON_BUILD/$addon_id/
    chmod +x $ADDON_BUILD/$addon_id/$addon_so
  fi

  if [ -d $PKG_INSTALL/usr/lib/kernel-overlays/$addon_id ] ; then
    mkdir -p $ADDON_BUILD/$addon_id/kernel-overlay
    cp -PR $PKG_INSTALL/usr/lib/kernel-overlays/$addon_id/* $ADDON_BUILD/$addon_id/kernel-overlay
  fi
}

install_addon_source() {
  if [ -d $PKG_DIR/source ]; then
    cp -R $PKG_DIR/source/* "$1"
  fi
}

install_addon_images() {
  local dest_dir="$1"

  if [ -f "$PKG_DIR/icon/icon.png" ]; then
    mkdir -p "$dest_dir/resources"
    cp "$PKG_DIR/icon/icon.png" "$dest_dir/resources"
  fi

  if [ -f "$DISTRO_DIR/$DISTRO/addons/fanart.png" ]; then
    mkdir -p "$dest_dir/resources"
    cp "$DISTRO_DIR/$DISTRO/addons/fanart.png" "$dest_dir/resources"
  fi
}

create_addon_xml() {
  local addon_xml addon_version addon_name provider_name requires requires_addonname requires_addonversion screenshots
  local tmp_changelog

  addon_xml="$1/addon.xml"

  IFS=" "
for i in $PKG_ADDON_REQUIRES; do
  requires_addonname=`echo $i | cut -f1 -d ":"`
  requires_addonversion=`echo $i | cut -f2 -d ":"`
  requires="$requires\n    <import addon=\"$requires_addonname\" version=\"$requires_addonversion\" />"
done
  unset IFS

  if [ ! -f "$addon_xml" ] ; then
    cp $ROOT/config/addon/${PKG_ADDON_TYPE}.xml "$addon_xml"
    addon_version=${PKG_ADDON_VERSION:-${ADDON_VERSION}.${PKG_REV}}
  else
    if  ! command -v xmlstarlet >/dev/null ; then
      die "*** ERROR: $ADDON has addon.xml shipped, you need 'xmlstarlet' ***" "255"
    fi
    addon_version="${PKG_ADDON_VERSION:-$(xmlstarlet sel -t -v "/addon/@version" "$addon_xml").$PKG_REV}"
    xmlstarlet ed --inplace -u "/addon[@version]/@version" -v "$addon_version" "$addon_xml"
  fi

  if [ -f $PKG_DIR/changelog.txt ]; then
    tmp_changelog="$(mktemp)"
    cat ${PKG_DIR}/changelog.txt | xmlstarlet esc >"${tmp_changelog}"
    sed -e "/@PKG_ADDON_NEWS@/ \
         {
           r ${tmp_changelog}
           d
         }" -i "$addon_xml"
    rm -f "${tmp_changelog}"
  else
    sed -e "s|@PKG_ADDON_NEWS@||g" -i "$addon_xml"
  fi

  provider_name=${PKG_MAINTAINER:-"Team LibreELEC"}
  addon_name=${PKG_ADDON_NAME:-"$PKG_NAME"}

  for f in $PKG_DIR/source/resources/screenshot-*.{jpg,png}; do
    if [ -f "$f" ]; then
      screenshots+="<screenshot>resources/$(basename $f)</screenshot>\n"
    fi
  done

  sed -e "s|@PKG_ADDON_ID@|$PKG_ADDON_ID|g" \
      -e "s|@ADDON_NAME@|$addon_name|g" \
      -e "s|@ADDON_VERSION@|$addon_version|g" \
      -e "s|@REQUIRES@|$requires|g" \
      -e "s|@PKG_SHORTDESC@|$PKG_SHORTDESC|g" \
      -e "s|@OS_VERSION@|$OS_VERSION|g" \
      -e "s|@PKG_LONGDESC@|$PKG_LONGDESC|g" \
      -e "s|@PKG_DISCLAIMER@|$PKG_DISCLAIMER|g" \
      -e "s|@PROVIDER_NAME@|$provider_name|g" \
      -e "s|@PKG_ADDON_PROVIDES@|$PKG_ADDON_PROVIDES|g" \
      -e "s|@PKG_ADDON_SCREENSHOT@|$screenshots|g" \
      -e "s|@PKG_ADDON_BROKEN@|$PKG_ADDON_BROKEN|g" \
      -i "$addon_xml"
}

install_addon_files() {
  mkdir -p "$1"

  install_addon_source "$1"
  install_addon_images "$1"
  create_addon_xml "$1"
  python_fix_abi "$1"

  if pkg_call_exists_opt post_install_addon; then
    INSTALL="$1" pkg_call
  fi
}

install_driver_addon_files() {
  if [ "$#" -eq 0 ] ; then
    die "$(print_color CLR_ERROR "no module search path defined")"
  fi

  PKG_MODULE_DIR="$INSTALL/$(get_full_module_dir $PKG_ADDON_ID)/updates/$PKG_ADDON_ID"
  PKG_ADDON_DIR="$INSTALL/usr/share/$MEDIACENTER/addons/$PKG_ADDON_ID"

  mkdir -p $PKG_MODULE_DIR
  find $@ -name \*.ko -exec cp {} $PKG_MODULE_DIR \;

  find $PKG_MODULE_DIR -name \*.ko -exec ${TARGET_KERNEL_PREFIX}strip --strip-debug {} \;

  mkdir -p $PKG_ADDON_DIR
  cp $PKG_DIR/changelog.txt $PKG_ADDON_DIR
  install_addon_files "$PKG_ADDON_DIR"
}


### TARGET CONFIGURATION HELPERS ###
add_user() {
  # Usage: add_user "username" "password" "userid" "groupid" "description" "home" "shell"
  mkdir -p ${INSTALL}/etc
  touch ${INSTALL}/etc/passwd
  if ! grep -q "^$1:" ${INSTALL}/etc/passwd; then
    echo "$1:x:$3:$4:$5:$6:$7" >> ${INSTALL}/etc/passwd
  fi

  mkdir -p ${INSTALL}/usr/cache
  touch ${INSTALL}/usr/cache/shadow
  ln -sf /storage/.cache/shadow ${INSTALL}/etc/shadow 2>/dev/null || true

  PASSWORD="$2"
  if [ "$PASSWORD" = "x" ]; then
    PASSWORD="*"
  fi
  if ! grep -q "^$1:" ${INSTALL}/usr/cache/shadow; then
    echo "$1:$PASSWORD:::::::" >> ${INSTALL}/usr/cache/shadow
  fi
}

add_group() {
  # Usage: add_group "groupname" "groupid" ("members")
  mkdir -p ${INSTALL}/etc
  touch ${INSTALL}/etc/group
  if [ -z "`grep "$1:" ${INSTALL}/etc/group`" ]; then
    echo "$1:x:$2:$3" >> ${INSTALL}/etc/group
  fi
}

# Usage: enable_service <unit> [target]
enable_service() {
  local unit="$1"
  local unit_dir="usr/lib/systemd/system"
  local target="$2"
  local target_dir=$INSTALL

  [ -f "$target_dir/$unit_dir/$unit" ] || die "ERROR: cannot enable non-existent service $target_dir/$unit_dir/$unit"

  if [ -z "$target" ] ; then
    for target in `grep '^WantedBy' $target_dir/$unit_dir/$unit | cut -f2 -d=` ; do
      if [ -n "$target" ]; then
        mkdir -p ${target_dir}/$unit_dir/${target}.wants
        ln -sf ../${unit} ${target_dir}/$unit_dir/${target}.wants/
      fi
    done
  fi
  for target in `grep '^Alias' $target_dir/$unit_dir/$unit | cut -f2 -d=` ; do
    if [ -n "$target" ]; then
      ln -sf ${unit} ${target_dir}/$unit_dir/${target}
    fi
  done
}


### MULTI-THREADED FUNCTION HELPERS ###
# flocks: 94 (pkg_lock_status)
#         95 (scripts/pkgbuild)
#         96 (acquire_exclusive_lock)
#         97 (acquire_update_lock)
#         98 (pkg_lock)
#         99 (scripts/get)

# Test build type so that these functions are a no-op during non-multithreaded builds.

# Prevent concurrent modifications to a package during certain activities.
# With dynamic scheduling we now only need to acquire the lock
# during unpack and reconf, all other activities do not need to acquire a
# lock as there should be no concurrent access however the existing code path
# potentially generates useful logging for minimal cost so keep it.
#
# If a package is already locked and the owner is ourselves
# then assume we already have the required lock.
pkg_lock() {
  is_sequential_build && return 0

  local pkg="$1" task="$2" parent_pkg="$3"
  local this_job="${MTJOBID}"
  local lock_job lock_seq lock_task lock_pkg locked=no idwidth

  if [ "${task}" = "unpack" -o "${task}" = "reconf" ]; then
    exec 98>"${THREAD_CONTROL}/locks/${pkg}.${task}"
    while [ : ]; do
      read -r lock_job lock_seq lock_task lock_pkg <<<$(cat "${THREAD_CONTROL}/locks/${pkg}.${task}.owner" 2>/dev/null)
      [ -n "${lock_job}" ] && break
      flock --wait 1 --exclusive 98 && locked=yes && break
    done

    if [ "${locked}" = "no" -a "${lock_job}/${lock_seq}" != "${this_job}/${PARALLEL_SEQ}" ]; then
      [ "${THREADCOUNT}" = "0" ] && idwidth=${#MTMAXJOBS} || idwidth=2
      pkg_lock_status "STALLED" "${parent_pkg}" "${task}" "$(printf "waiting on [%0*d] %s %s" ${idwidth} ${lock_job} "${lock_task}" "${lock_pkg}")"
      flock --exclusive 98
    fi
  fi

  pkg_lock_status "LOCKED" "${pkg}" "${task}"
}

# Log additional information for a locked package.
pkg_lock_status() {
  is_sequential_build && return 0

  local status="$1" pkg="$2" task="$3" msg="$4"
  local this_job="${MTJOBID}" line idwidth

  [ "${THREADCOUNT}" = "0" ] && idwidth=${#MTMAXJOBS} || idwidth=2

  (
    flock --exclusive 94

    # Write the configured number of slots to history to improve accuracy of later analysis
    if [ ! -f "${THREAD_CONTROL}/history" ]; then
      printf "%s: <%06d> [%0*d/%0*d] %-7s %-7s %s %s\n" \
        "$(date +%Y-%m-%d\ %H:%M:%S.%N)" $$ ${idwidth} 0 ${#MTMAXJOBS} 0 "IDLE" "config" "info" "slots=${MTMAXSLOT};jobs=${MTMAXJOBS}" >>"${THREAD_CONTROL}/history"
    fi

    printf -v line "%s: <%06d> [%0*d/%0*d] %-7s %-7s %-35s" \
      "$(date +%Y-%m-%d\ %H:%M:%S.%N)" $$ ${idwidth} ${this_job} ${#MTMAXJOBS} ${PARALLEL_SEQ:-0} "${status}" "${task}" "${pkg}"
    [ -n "${msg}" ] && line+=" (${msg})"

    echo "${line}" >>"${THREAD_CONTROL}/history"

    if [ "${DASHBOARD}" != "no" ]; then
      update_dashboard "${status}" "${pkg}" "${task}" "${msg}"
    fi
  ) 94>"${THREAD_CONTROL}/locks/.history"

  if [ "${status}" = "LOCKED" ]; then
    echo "${this_job} ${PARALLEL_SEQ} ${task} ${pkg}" >"${THREAD_CONTROL}/locks/${pkg}.${task}.owner"
  elif [ "${status}" = "UNLOCK" ]; then
    rm "${THREAD_CONTROL}/locks/${pkg}.${task}.owner"
  fi

  return 0
}

update_dashboard() {
  is_sequential_build && return 0

  local status="$1" pkg="$2" task="$3" msg="$4"
  local line preamble num elapsed projdevarch
  local boldred boldgreen boldyellow endcolor idwidth

  [ "${THREADCOUNT}" = "0" ] && idwidth=${#MTMAXSLOT} || idwidth=2

  if [ ! -s ${THREAD_CONTROL}/status ]; then
    echo "" >"${THREAD_CONTROL}/status"
    echo "" >>"${THREAD_CONTROL}/status"
    for i in $(seq 1 $((MTMAXSLOT))); do
      printf "[%0*d/%0*d] %-7s\n" ${idwidth} ${i} ${#MTMAXJOBS} 0 "IDLE" >>"${THREAD_CONTROL}/status"
    done
  fi

  num=$(< "${THREAD_CONTROL}/progress.prev")
  projdevarch="${PROJECT}/"
  [ -n "${DEVICE}" ] && projdevarch+="${DEVICE}/"
  projdevarch+="${TARGET_ARCH}"
  [ -n "${BUILD_SUFFIX}" ] && projdevarch+=", ${BUILD_SUFFIX}"
  TZ=UTC0 printf -v elapsed "%(%H:%M:%S)T" $(($(date +%s) - MTBUILDSTART))
  printf -v preamble "%s Dashboard (%s) - %d of %d jobs completed, %s elapsed" "${DISTRONAME}" "${projdevarch}" $((num + 1)) ${MTMAXJOBS} "${elapsed}"
  printf -v preamble "%b%-105s %s" "\e[2J\e[0;0H" "${preamble}" "$(date "+%Y-%m-%d %H:%M:%S")"

  if [ "${DISABLE_COLORS}" != "yes" ]; then
    boldred="\e[1;31m"
    boldgreen="\e[1;32m"
    boldyellow="\e[1;33m"
    white="\e[0;37m"
    endcolor="\e[0m"

    case "${status}" in
      IDLE)    color="${white}";;
      STALLED) color="${boldyellow}";;
      MUTEX/W) color="${boldyellow}";;
      FAILED ) color="${boldred}";;
      *)       color="${boldgreen}";;
    esac
  fi

  printf -v line "[%0*d/%0*d] %b%-7s%b %-7s %-35s" ${idwidth} ${MTJOBID} ${#MTMAXJOBS} ${PARALLEL_SEQ:-0} "${color}" "${status}" "${endcolor}" "${task}" "${pkg}"
  [ -n "${msg}" ] && line+=" ${msg}"

  sed -e "1s@.*@${preamble}@;$((MTJOBID + 2))s@.*@${line}@" -i "${THREAD_CONTROL}/status"
}

# Thread concurrency helpers to avoid concurrency issues with some code,
# eg. when Python installs directly into $TOOLCHAIN.
acquire_exclusive_lock() {
  is_sequential_build && return 0

  local pkg="$1" task="$2" lockfile="${3:-global}"
  local this_job="${MTJOBID}"
  local lock_job lock_seq lock_task lock_pkg locked=no idwidth

  exec 96>"${THREAD_CONTROL}/locks/.mutex.${lockfile}"
  while [ : ]; do
    read -r lock_job lock_seq lock_task lock_pkg <<<$(cat "${THREAD_CONTROL}/locks/.mutex.${lockfile}.owner" 2>/dev/null)
    [ -n "${lock_job}" ] && break
    flock --wait 1 --exclusive 96 && locked=yes && break
  done

  if [ "${locked}" = "no" -a "${lock_job}/${lock_seq}" != "${this_job}/${PARALLEL_SEQ}" ]; then
    [ "${THREADCOUNT}" = "0" ] && idwidth=${#MTMAXJOBS} || idwidth=2
    pkg_lock_status "MUTEX/W" "${pkg}" "${task}" "$(printf "mutex: %s; waiting on [%0*d] %s %s" "${lockfile}" ${idwidth} ${lock_job} "${lock_task}" "${lock_pkg}")"
    flock --exclusive 96
  fi

  pkg_lock_status "MUTEX" "${pkg}" "${task}" "mutex: ${lockfile}"

  echo "${this_job} ${PARALLEL_SEQ} ${task} ${pkg}" >"${THREAD_CONTROL}/locks/.mutex.${lockfile}.owner"
}

release_exclusive_lock() {
  is_sequential_build && return 0

  local pkg="$1" task="$2" lockfile="${3:-global}"

  pkg_lock_status "ACTIVE" "${pkg}" "${task}"

  rm "${THREAD_CONTROL}/locks/.mutex.${lockfile}.owner"
  flock --unlock 96 2>/dev/null
}

# Execute single command using mutex
exec_thread_safe() {
  local result
  acquire_exclusive_lock "${PKG_NAME:exec}" "execcmd"
  $@
  result=$?
  release_exclusive_lock "${PKG_NAME:exec}" "execcmd"
  return ${result}
}

# A lightweight target specific lock (eg. image, sysroot)
acquire_update_lock() {
  is_sequential_build && return 0

  exec 97>"${THREAD_CONTROL}/locks/.update.${1}"
  flock --exclusive 97
}

release_update_lock() {
  is_sequential_build && return 0

  flock --unlock 97 2>/dev/null
}

# Use distribution functions if any
if [ -f "distributions/$DISTRO/config/functions" ]; then
  . distributions/$DISTRO/config/functions
fi