# - The builtin (binary) CPack Deb generator (Unix only)
# CPackDeb may be used to create Deb package using CPack.
# CPackDeb is a CPack generator thus it uses the CPACK_XXX variables
# used by CPack : http://www.cmake.org/Wiki/CMake:CPackConfiguration.
# CPackDeb generator should work on any linux host but it will
# produce better deb package when Debian specific tools 'dpkg-xxx'
# are usable on the build system.
#
# CPackDeb has specific features which are controlled by
# the specifics CPACK_DEBIAN_XXX variables.You'll find a detailed usage on
# the wiki:
#  http://www.cmake.org/Wiki/CMake:CPackPackageGenerators#DEB_.28UNIX_only.29
# However as a handy reminder here comes the list of specific variables:
#
# CPACK_DEBIAN_PACKAGE_NAME
#     Mandatory : YES
#     Default   : CPACK_PACKAGE_NAME (lower case)
#     The debian package summary
# CPACK_DEBIAN_PACKAGE_VERSION
#     Mandatory : YES
#     Default   : CPACK_PACKAGE_VERSION
#     The debian package version
# CPACK_DEBIAN_PACKAGE_ARCHITECTURE)
#     Mandatory : YES
#     Default   : Output of dpkg --print-architecture (or i386 if dpkg is not found)
#     The debian package architecture
# CPACK_DEBIAN_PACKAGE_DEPENDS
#     Mandatory : NO
#     Default   : -
#     May be used to set deb dependencies.
# CPACK_DEBIAN_PACKAGE_MAINTAINER
#     Mandatory : YES
#     Default   : CPACK_PACKAGE_CONTACT
#     The debian package maintainer
# CPACK_DEBIAN_PACKAGE_DESCRIPTION
#     Mandatory : YES
#     Default   : CPACK_PACKAGE_DESCRIPTION_SUMMARY
#     The debian package description
# CPACK_DEBIAN_PACKAGE_SECTION
#     Mandatory : YES
#     Default   : 'devel'
#     The debian package section
# CPACK_DEBIAN_PACKAGE_PRIORITY
#     Mandatory : YES
#     Default   : 'optional'
#     The debian package priority
# CPACK_DEBIAN_PACKAGE_HOMEPAGE
#     Mandatory : NO
#     Default   : -
#     The URL of the web site for this package
# CPACK_DEBIAN_PACKAGE_SHLIBDEPS
#     Mandatory : NO
#     Default   : OFF
#     May be set to ON in order to use dpkg-shlibdeps to generate
#     better package dependency list.
#     You may need set CMAKE_INSTALL_RPATH toi appropriate value
#     if you use this feature, because if you don't dpkg-shlibdeps
#     may fail to find your own shared libs.
#     See http://www.cmake.org/Wiki/CMake_RPATH_handling.
# CPACK_DEBIAN_PACKAGE_DEBUG
#     Mandatory : NO
#     Default   : -
#     May be set when invoking cpack in order to trace debug informations
#     during CPackDeb run.


#=============================================================================
# Copyright 2007-2009 Kitware, Inc.
# Copyright 2007-2009 Mathieu Malaterre <mathieu.malaterre@gmail.com>
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distributed this file outside of CMake, substitute the full
#  License text for the above reference.)

# CPack script for creating Debian package
# Author: Mathieu Malaterre
#
# http://wiki.debian.org/HowToPackageForDebian

IF(CMAKE_BINARY_DIR)
  MESSAGE(FATAL_ERROR "CPackDeb.cmake may only be used by CPack internally.")
ENDIF(CMAKE_BINARY_DIR)

IF(NOT UNIX)
  MESSAGE(FATAL_ERROR "CPackDeb.cmake may only be used under UNIX.")
ENDIF(NOT UNIX)

# CPACK_DEBIAN_PACKAGE_SHLIBDEPS
# If specify OFF, only user depends are used
IF(NOT DEFINED CPACK_DEBIAN_PACKAGE_SHLIBDEPS)
  SET(CPACK_DEBIAN_PACKAGE_SHLIBDEPS OFF)
ENDIF(NOT DEFINED CPACK_DEBIAN_PACKAGE_SHLIBDEPS)

IF(CPACK_DEBIAN_PACKAGE_SHLIBDEPS)
  # dpkg-shlibdeps is a Debian utility for generating dependency list
  FIND_PROGRAM(SHLIBDEPS_EXECUTABLE dpkg-shlibdeps)

  # Check version of the dpkg-shlibdeps tool using CPackRPM method
  IF(SHLIBDEPS_EXECUTABLE)
    EXECUTE_PROCESS(COMMAND ${SHLIBDEPS_EXECUTABLE} --version
      OUTPUT_VARIABLE _TMP_VERSION
      ERROR_QUIET
      OUTPUT_STRIP_TRAILING_WHITESPACE)
    STRING(REGEX MATCH "dpkg-shlibdeps version ([0-9]+\\.[0-9]+\\.[0-9]+)"
      SHLIBDEPS_EXECUTABLE_VERSION
      ${_TMP_VERSION})
    SET(SHLIBDEPS_EXECUTABLE_VERSION "${CMAKE_MATCH_1}")
    IF(CPACK_DEBIAN_PACKAGE_DEBUG)
      MESSAGE( "CPackDeb Debug: dpkg-shlibdeps version is <${SHLIBDEPS_EXECUTABLE_VERSION}>")
    ENDIF(CPACK_DEBIAN_PACKAGE_DEBUG)

    # Generating binary list - Get type of all install files
    EXECUTE_PROCESS(COMMAND find -type f
      COMMAND xargs file
      WORKING_DIRECTORY "${CPACK_TEMPORARY_DIRECTORY}"
      OUTPUT_VARIABLE CPACK_DEB_INSTALL_FILES)

    # Convert to CMake list
    STRING(REGEX REPLACE "\n" ";" CPACK_DEB_INSTALL_FILES ${CPACK_DEB_INSTALL_FILES})

    # Only dynamically linked ELF files are included
    # Extract only file name infront of ":"
    FOREACH ( _FILE ${CPACK_DEB_INSTALL_FILES})
      IF ( ${_FILE} MATCHES "ELF.*dynamically linked")
         STRING(REGEX MATCH "(^.*):" _FILE_NAME ${_FILE})
         LIST(APPEND CPACK_DEB_BINARY_FILES ${CMAKE_MATCH_1})
      ENDIF()
    ENDFOREACH()

    MESSAGE( "CPackDeb: - Generating dependency list")

    # Create blank control file for running dpkg-shlibdeps
    # There might be some other way to invoke dpkg-shlibdeps without creating this file
    # but standard debian package should not have anything that can collide with this file or directory
    FILE(MAKE_DIRECTORY ${CPACK_TEMPORARY_DIRECTORY}/debian)
    FILE(WRITE ${CPACK_TEMPORARY_DIRECTORY}/debian/control "")

    # Execute dpkg-shlibdeps
    # --ignore-missing-info : allow dpkg-shlibdeps to run even if some libs do not belong to a package
    # -O : print to STDOUT
    EXECUTE_PROCESS(COMMAND ${SHLIBDEPS_EXECUTABLE} --ignore-missing-info -O ${CPACK_DEB_BINARY_FILES}
      WORKING_DIRECTORY "${CPACK_TEMPORARY_DIRECTORY}"
      OUTPUT_VARIABLE SHLIBDEPS_OUTPUT
      RESULT_VARIABLE SHLIBDEPS_RESULT
      ERROR_VARIABLE SHLIBDEPS_ERROR
      OUTPUT_STRIP_TRAILING_WHITESPACE )
    IF(CPACK_DEBIAN_PACKAGE_DEBUG)
      # dpkg-shlibdeps will throw some warnings if some input files are not binary
      MESSAGE( "CPackDeb Debug: dpkg-shlibdeps warnings \n${SHLIBDEPS_ERROR}")
    ENDIF(CPACK_DEBIAN_PACKAGE_DEBUG)
    IF (NOT SHLIBDEPS_RESULT EQUAL 0)
      MESSAGE (FATAL_ERROR "CPackDeb: dpkg-shlibdeps: ${SHLIBDEPS_ERROR}")
    ENDIF (NOT SHLIBDEPS_RESULT EQUAL 0)

    #Get rid of prefix generated by dpkg-shlibdeps
    string (REGEX REPLACE "^.*Depends=" "" CPACK_DEBIAN_PACKAGE_AUTO_DEPENDS ${SHLIBDEPS_OUTPUT})

    IF(CPACK_DEBIAN_PACKAGE_DEBUG)
      MESSAGE( "CPackDeb Debug: Found dependency: ${CPACK_DEBIAN_PACKAGE_AUTO_DEPENDS}")
    ENDIF(CPACK_DEBIAN_PACKAGE_DEBUG)

    # Remove blank control file
    # Might not be safe if package actual contain file or directory named debian
    FILE(REMOVE_RECURSE "${CPACK_TEMPORARY_DIRECTORY}/debian")

    # Append user depend if set
    IF (CPACK_DEBIAN_PACKAGE_DEPENDS)
      SET (CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_AUTO_DEPENDS}, ${CPACK_DEBIAN_PACKAGE_DEPENDS}")
    ELSE (CPACK_DEBIAN_PACKAGE_DEPENDS)
      SET (CPACK_DEBIAN_PACKAGE_DEPENDS "${CPACK_DEBIAN_PACKAGE_AUTO_DEPENDS}")
    ENDIF (CPACK_DEBIAN_PACKAGE_DEPENDS)

  ELSE (SHLIBDEPS_EXECUTABLE)
    IF(CPACK_DEBIAN_PACKAGE_DEBUG)
      MESSAGE( "CPackDeb Debug: Using only user-provided depends because dpkg-shlibdeps is not found.")
    ENDIF(CPACK_DEBIAN_PACKAGE_DEBUG)
  ENDIF(SHLIBDEPS_EXECUTABLE)

ELSE (CPACK_DEBIAN_PACKAGE_SHLIBDEPS)
  IF(CPACK_DEBIAN_PACKAGE_DEBUG)
    MESSAGE( "CPackDeb Debug: Using only user-provided depends")
  ENDIF(CPACK_DEBIAN_PACKAGE_DEBUG)
ENDIF(CPACK_DEBIAN_PACKAGE_SHLIBDEPS)

# Let's define the control file found in debian package:

# Binary package:
# http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-binarycontrolfiles

# DEBIAN/control
# debian policy enforce lower case for package name
# Package: (mandatory)
IF(NOT CPACK_DEBIAN_PACKAGE_NAME)
  STRING(TOLOWER "${CPACK_PACKAGE_NAME}" CPACK_DEBIAN_PACKAGE_NAME)
ENDIF(NOT CPACK_DEBIAN_PACKAGE_NAME)

# Version: (mandatory)
IF(NOT CPACK_DEBIAN_PACKAGE_VERSION)
  IF(NOT CPACK_PACKAGE_VERSION)
    MESSAGE(FATAL_ERROR "CPackDeb: Debian package requires a package version")
  ENDIF(NOT CPACK_PACKAGE_VERSION)
  SET(CPACK_DEBIAN_PACKAGE_VERSION ${CPACK_PACKAGE_VERSION})
ENDIF(NOT CPACK_DEBIAN_PACKAGE_VERSION)

# Architecture: (mandatory)
IF(NOT CPACK_DEBIAN_PACKAGE_ARCHITECTURE)
  # There is no such thing as i686 architecture on debian, you should use i386 instead
  # $ dpkg --print-architecture
  FIND_PROGRAM(DPKG_CMD dpkg)
  IF(NOT DPKG_CMD)
    MESSAGE(STATUS "CPackDeb: Can not find dpkg in your path, default to i386.")
    SET(CPACK_DEBIAN_PACKAGE_ARCHITECTURE i386)
  ENDIF(NOT DPKG_CMD)
  EXECUTE_PROCESS(COMMAND "${DPKG_CMD}" --print-architecture
    OUTPUT_VARIABLE CPACK_DEBIAN_PACKAGE_ARCHITECTURE
    OUTPUT_STRIP_TRAILING_WHITESPACE
    )
ENDIF(NOT CPACK_DEBIAN_PACKAGE_ARCHITECTURE)

# have a look at GET_PROPERTY(result GLOBAL PROPERTY ENABLED_FEATURES),
# this returns the successful FIND_PACKAGE() calls, maybe this can help
# Depends:
# You should set: DEBIAN_PACKAGE_DEPENDS
# TODO: automate 'objdump -p | grep NEEDED'
IF(NOT CPACK_DEBIAN_PACKAGE_DEPENDS)
  MESSAGE(STATUS "CPACK_DEBIAN_PACKAGE_DEPENDS not set, the package will have no dependencies.")
ENDIF(NOT CPACK_DEBIAN_PACKAGE_DEPENDS)

# Maintainer: (mandatory)
IF(NOT CPACK_DEBIAN_PACKAGE_MAINTAINER)
  IF(NOT CPACK_PACKAGE_CONTACT)
    MESSAGE(FATAL_ERROR "CPackDeb: Debian package requires a maintainer for a package, set CPACK_PACKAGE_CONTACT or CPACK_DEBIAN_PACKAGE_MAINTAINER")
  ENDIF(NOT CPACK_PACKAGE_CONTACT)
  SET(CPACK_DEBIAN_PACKAGE_MAINTAINER ${CPACK_PACKAGE_CONTACT})
ENDIF(NOT CPACK_DEBIAN_PACKAGE_MAINTAINER)

# Description: (mandatory)
IF(NOT CPACK_DEBIAN_PACKAGE_DESCRIPTION)
  IF(NOT CPACK_PACKAGE_DESCRIPTION_SUMMARY)
    MESSAGE(FATAL_ERROR "CPackDeb: Debian package requires a summary for a package, set CPACK_PACKAGE_DESCRIPTION_SUMMARY or CPACK_DEBIAN_PACKAGE_DESCRIPTION")
  ENDIF(NOT CPACK_PACKAGE_DESCRIPTION_SUMMARY)
  SET(CPACK_DEBIAN_PACKAGE_DESCRIPTION ${CPACK_PACKAGE_DESCRIPTION_SUMMARY})
ENDIF(NOT CPACK_DEBIAN_PACKAGE_DESCRIPTION)

# Section: (recommended)
IF(NOT CPACK_DEBIAN_PACKAGE_SECTION)
  SET(CPACK_DEBIAN_PACKAGE_SECTION "devel")
ENDIF(NOT CPACK_DEBIAN_PACKAGE_SECTION)

# Priority: (recommended)
IF(NOT CPACK_DEBIAN_PACKAGE_PRIORITY)
  SET(CPACK_DEBIAN_PACKAGE_PRIORITY "optional")
ENDIF(NOT CPACK_DEBIAN_PACKAGE_PRIORITY )

# Recommends:
# You should set: CPACK_DEBIAN_PACKAGE_RECOMMENDS

# Suggests:
# You should set: CPACK_DEBIAN_PACKAGE_SUGGESTS

# CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
# This variable allow advanced user to add custom script to the control.tar.gz (inside the .deb archive)
# Typical examples are:
# - conffiles
# - postinst
# - postrm
# - prerm"
# Usage:
# SET(CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA
#    "${CMAKE_CURRENT_SOURCE_DIR/prerm;${CMAKE_CURRENT_SOURCE_DIR}/postrm")


# For debian source packages:
# debian/control
# http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-sourcecontrolfiles

# .dsc
# http://www.debian.org/doc/debian-policy/ch-controlfields.html#s-debiansourcecontrolfiles

# Builds-Depends:
#IF(NOT CPACK_DEBIAN_PACKAGE_BUILDS_DEPENDS)
#  SET(CPACK_DEBIAN_PACKAGE_BUILDS_DEPENDS
#    "debhelper (>> 5.0.0), libncurses5-dev, tcl8.4"
#  )
#ENDIF(NOT CPACK_DEBIAN_PACKAGE_BUILDS_DEPENDS)