CPackDeb: Use `CPACK_PACKAGE_DESCRIPTION_FILE`

Also, handle per-component description nicely.

13 files changed, 305 insertions, 52 deletions

diff --git a/Help/cpack_gen/deb.rst b/Help/cpack_gen/deb.rst
index 23f0515..db71c87 100644
--- a/Help/cpack_gen/deb.rst
+++ b/Help/cpack_gen/deb.rst
@@ -179,16 +179,24 @@ List of CPack DEB generator specific variables:
  * Default   : ``CPACK_PACKAGE_CONTACT``
 
 .. variable:: CPACK_DEBIAN_PACKAGE_DESCRIPTION
-              CPACK_COMPONENT_<COMPONENT>_DESCRIPTION
+              CPACK_DEBIAN_<COMPONENT>_DESCRIPTION
 
  The Debian package description
 
  * Mandatory : YES
  * Default   :
 
-   - :variable:`CPACK_DEBIAN_PACKAGE_DESCRIPTION` if set or
-   - :variable:`CPACK_PACKAGE_DESCRIPTION_SUMMARY`
+   - :variable:`CPACK_DEBIAN_<COMPONENT>_DESCRIPTION` (component
+     based installers only) if set, or :variable:`CPACK_DEBIAN_PACKAGE_DESCRIPTION` if set, or
+   - :variable:`CPACK_COMPONENT_<compName>_DESCRIPTION` (component
+     based installers only) if set, or :variable:`CPACK_PACKAGE_DESCRIPTION` if set, or
+   - content of the file specified in :variable:`CPACK_PACKAGE_DESCRIPTION_FILE` if set
 
+ If after that description is not set, :variable:`CPACK_PACKAGE_DESCRIPTION_SUMMARY` going to be
+ used if set. Otherwise, :variable:`CPACK_PACKAGE_DESCRIPTION_SUMMARY` will be added as the first
+ line of description as defined in `Debian Policy Manual`_.
+
+.. _Debian Policy Manual: https://www.debian.org/doc/debian-policy/ch-controlfields.html#description
 
 .. variable:: CPACK_DEBIAN_PACKAGE_SECTION
               CPACK_DEBIAN_<COMPONENT>_PACKAGE_SECTION
diff --git a/Modules/Internal/CPack/CPackDeb.cmake b/Modules/Internal/CPack/CPackDeb.cmake
index e22f623..ad8e078 100644
--- a/Modules/Internal/CPack/CPackDeb.cmake
+++ b/Modules/Internal/CPack/CPackDeb.cmake
@@ -56,6 +56,67 @@ function(extract_so_info shared_object libname version)
   endif()
 endfunction()
 
+function(cpack_deb_check_description SUMMARY LINES RESULT_VARIABLE)
+  set(_result TRUE)
+
+  # Get the summary line
+  if(NOT SUMMARY MATCHES "^[^\\s].*$")
+    set(_result FALSE)
+    set(${RESULT_VARIABLE} ${_result} PARENT_SCOPE)
+    return()
+  endif()
+
+  foreach(_line IN LISTS LINES)
+    if(NOT _line MATCHES "^ +[^ ]+.*$")
+      set(_result FALSE)
+      break()
+    endif()
+  endforeach()
+
+  set(${RESULT_VARIABLE} ${_result} PARENT_SCOPE)
+endfunction()
+
+function(cpack_deb_format_package_description TEXT OUTPUT_VAR)
+  # Turn the possible multi-line string into a list
+  string(UUID uuid NAMESPACE 00000000-0000-0000-0000-000000000000 TYPE SHA1)
+  string(REPLACE ";" "${uuid}" _text "${TEXT}")
+  string(REPLACE "\n" ";" _lines "${_text}")
+  list(POP_FRONT _lines _summary)
+
+  # Check if reformatting required
+  cpack_deb_check_description("${_summary}" "${_lines}" _result)
+  if(_result)
+    # Ok, no formatting required
+    set(${OUTPUT_VAR} "${TEXT}" PARENT_SCOPE)
+    return()
+  endif()
+
+  # Format the summary line
+  string(STRIP "${_summary}" _summary)
+
+  # Make sure the rest formatted properly
+  set(_result)
+  foreach(_line IN LISTS _lines)
+    string(STRIP "${_line}" _line_strip)
+    if(NOT _line_strip)
+      # Replace empty lines w/ a _single full stop character_
+      set(_line " .")
+    else()
+      # Prepend the normal lines w/ a single space.
+      # If the line already starts w/ at least one space,
+      # it'll become _verbatim_ (assuming it supposed to be
+      # verbatim in the original text).
+      string(PREPEND _line " ")
+    endif()
+    list(APPEND _result "${_line}")
+  endforeach()
+
+  list(PREPEND _result "${_summary}")
+  list(JOIN _result "\n" _result)
+  string(REPLACE "${uuid}"  ";" _result "${_result}")
+  set(${OUTPUT_VAR} "${_result}" PARENT_SCOPE)
+endfunction()
+
 function(cpack_deb_prepare_package_vars)
   # CPACK_DEBIAN_PACKAGE_SHLIBDEPS
   # If specify OFF, only user depends are used
@@ -436,26 +497,53 @@ function(cpack_deb_prepare_package_vars)
   endif()
 
   # Description: (mandatory)
-  if(NOT CPACK_DEB_PACKAGE_COMPONENT)
-    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()
-      set(CPACK_DEBIAN_PACKAGE_DESCRIPTION ${CPACK_PACKAGE_DESCRIPTION_SUMMARY})
-    endif()
+  # Try package description first
+  if(CPACK_DEB_PACKAGE_COMPONENT)
+    cpack_deb_variable_fallback("CPACK_DEBIAN_PACKAGE_DESCRIPTION"
+      "CPACK_DEBIAN_${_local_component_name}_DESCRIPTION"
+      "CPACK_COMPONENT_${_local_component_name}_DESCRIPTION")
   else()
-    set(component_description_var CPACK_COMPONENT_${_local_component_name}_DESCRIPTION)
-
-    # component description overrides package description
-    if(${component_description_var})
-      set(CPACK_DEBIAN_PACKAGE_DESCRIPTION ${${component_description_var}})
-    elseif(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 or ${component_description_var}")
-      endif()
+    cpack_deb_variable_fallback("CPACK_DEBIAN_PACKAGE_DESCRIPTION"
+      "CPACK_DEBIAN_PACKAGE_DESCRIPTION"
+      "CPACK_PACKAGE_DESCRIPTION")
+  endif()
+
+  # Still no description? ... and description file has set ...
+  if(NOT CPACK_DEBIAN_PACKAGE_DESCRIPTION AND CPACK_PACKAGE_DESCRIPTION_FILE)
+    # Read `CPACK_PACKAGE_DESCRIPTION_FILE` then...
+    file(READ ${CPACK_PACKAGE_DESCRIPTION_FILE} CPACK_DEBIAN_PACKAGE_DESCRIPTION)
+  endif()
+
+  # Still no description? #2
+  if(NOT CPACK_DEBIAN_PACKAGE_DESCRIPTION)
+    # Try to get `CPACK_PACKAGE_DESCRIPTION_SUMMARY` as the last hope
+    if(CPACK_PACKAGE_DESCRIPTION_SUMMARY)
       set(CPACK_DEBIAN_PACKAGE_DESCRIPTION ${CPACK_PACKAGE_DESCRIPTION_SUMMARY})
+    else()
+      # Giving up! Report an error...
+      set(_description_failure_message
+        "CPackDeb: Debian package requires a summary for a package, set CPACK_PACKAGE_DESCRIPTION_SUMMARY or CPACK_DEBIAN_PACKAGE_DESCRIPTION")
+      if(CPACK_DEB_PACKAGE_COMPONENT)
+        string(APPEND _description_failure_message
+          " or CPACK_DEBIAN_${_local_component_name}_DESCRIPTION")
+      endif()
+      message(FATAL_ERROR _description_failure_message)
     endif()
+
+  # Ok, description has set. According to the `Debian Policy Manual`_ the frist
+  # line is a pacakge summary.  Try to get it as well...
+  # See also: https://www.debian.org/doc/debian-policy/ch-controlfields.html#description
+  elseif(CPACK_PACKAGE_DESCRIPTION_SUMMARY)
+    # Merge summary w/ the detailed description
+    string(PREPEND CPACK_DEBIAN_PACKAGE_DESCRIPTION "${CPACK_PACKAGE_DESCRIPTION_SUMMARY}\n")
   endif()
+  # assert(CPACK_DEBIAN_PACKAGE_DESCRIPTION)
+
+  # Make sure description is properly formatted
+  cpack_deb_format_package_description(
+    "${CPACK_DEBIAN_PACKAGE_DESCRIPTION}"
+    CPACK_DEBIAN_PACKAGE_DESCRIPTION
+  )
 
   # Homepage: (optional)
   if(NOT CPACK_DEBIAN_PACKAGE_HOMEPAGE AND CMAKE_PROJECT_HOMEPAGE_URL)
diff --git a/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description1.cmake.in b/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description1.cmake.in
index 74d816c..67b108b 100644
--- a/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description1.cmake.in
+++ b/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description1.cmake.in
@@ -15,8 +15,9 @@ set(CPACK_COMPONENTS_IGNORE_GROUPS 1)
 #set(CPACK_COMPONENTS_ALL_IN_ONE_PACKAGE 1)
 
 # overriding previous descriptions
-set(CPACK_PACKAGE_DESCRIPTION_SUMMARY           "main description")
-set(CPACK_COMPONENT_APPLICATIONS_DESCRIPTION    "applications_description")
-set(CPACK_COMPONENT_HEADERS_DESCRIPTION         "headers_description")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "main description") # This become a summary line (the first one) of all descriptions
+set(CPACK_COMPONENT_APPLICATIONS_DESCRIPTION "applications_description")
+set(CPACK_COMPONENT_HEADERS_DESCRIPTION "headers_description")
 # libraries does not have any description and should inherit from CPACK_PACKAGE_DESCRIPTION_SUMMARY
+# plus content of the `CPACK_PACKAGE_DESCRIPTION_FILE`.
 unset(CPACK_COMPONENT_LIBRARIES_DESCRIPTION)
diff --git a/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description2.cmake.in b/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description2.cmake.in
index cda79bc..d877325 100644
--- a/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description2.cmake.in
+++ b/Tests/CPackComponentsDEB/MyLibCPackConfig-components-description2.cmake.in
@@ -15,12 +15,12 @@ set(CPACK_COMPONENTS_IGNORE_GROUPS 1)
 #set(CPACK_COMPONENTS_ALL_IN_ONE_PACKAGE 1)
 
 # overriding previous descriptions
-set(CPACK_PACKAGE_DESCRIPTION_SUMMARY           "main description 2")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "main description 2")
 
-# Components do not have any description
+# Components do not have any description.
+# So, content of `CPACK_PACKAGE_DESCRIPTION_FILE` gonna used
+# after summary line.
 unset(CPACK_COMPONENT_APPLICATIONS_DESCRIPTION)
 unset(CPACK_COMPONENT_HEADERS_DESCRIPTION)
-unset(CPACK_COMPONENT_LIBRARIES_DESCRIPTION)
 
-
-set(CPACK_COMPONENT_LIBRARIES_DESCRIPTION       "library description")
+set(CPACK_COMPONENT_LIBRARIES_DESCRIPTION "library description")
diff --git a/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description1.cmake b/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description1.cmake
index f74137c..86a74b2 100644
--- a/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description1.cmake
+++ b/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description1.cmake
@@ -48,26 +48,26 @@ if(DPKGDEB_EXECUTABLE)
                                       DPKGDEB_OUTPUT "${dpkg_output}"
                                       METAENTRY "Package:")
 
-    dpkgdeb_return_specific_metaentry(dpkg_description
-                                      DPKGDEB_OUTPUT "${dpkg_output}"
-                                      METAENTRY "Description:")
+    get_package_description("${dpkg_output}" dpkg_description)
 
     message(STATUS "package='${dpkg_package_name}', description='${dpkg_description}'")
 
     if(dpkg_package_name STREQUAL "mylib-applications")
-      if(NOT "${dpkg_description}" STREQUAL "applications_description")
+      set(expected_description "main description\n  applications_description")
+      if(NOT dpkg_description STREQUAL expected_description)
         set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != applications_description")
+                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: `${dpkg_description}` != `${expected_description}`")
       endif()
     elseif(dpkg_package_name STREQUAL "mylib-headers")
-      if(NOT dpkg_description STREQUAL "headers_description")
+      set(expected_description "main description\n  headers_description")
+      if(NOT dpkg_description STREQUAL expected_description)
         set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != headers_description")
+                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: `${dpkg_description}` != `${expected_description}`")
       endif()
     elseif(dpkg_package_name STREQUAL "mylib-libraries")
-      if(NOT dpkg_description STREQUAL "main description")
+      if(NOT dpkg_description MATCHES "main description\n.*")
         set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != 'main description'")
+                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: `${dpkg_description}` =~ `main description.*`")
       endif()
     else()
       set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
diff --git a/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description2.cmake b/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description2.cmake
index 241dda5..d53c73d 100644
--- a/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description2.cmake
+++ b/Tests/CPackComponentsDEB/RunCPackVerifyResult-components-description2.cmake
@@ -48,26 +48,20 @@ if(DPKGDEB_EXECUTABLE)
                                       DPKGDEB_OUTPUT "${dpkg_output}"
                                       METAENTRY "Package:")
 
-    dpkgdeb_return_specific_metaentry(dpkg_description
-                                      DPKGDEB_OUTPUT "${dpkg_output}"
-                                      METAENTRY "Description:")
+    get_package_description("${dpkg_output}" dpkg_description)
 
     message(STATUS "package='${dpkg_package_name}', description='${dpkg_description}'")
 
-    if(dpkg_package_name STREQUAL "mylib-applications")
-      if(NOT dpkg_description STREQUAL "main description 2")
-        set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != applications_description")
-      endif()
-    elseif(dpkg_package_name STREQUAL "mylib-headers")
-      if(NOT dpkg_description STREQUAL "main description 2")
+    if(dpkg_package_name STREQUAL "mylib-applications" OR dpkg_package_name STREQUAL "mylib-headers")
+      if(NOT dpkg_description MATCHES "main description 2\n.*")
         set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != headers_description")
+                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: `${dpkg_description}` =~ `main description 2`")
       endif()
     elseif(dpkg_package_name STREQUAL "mylib-libraries")
-      if(NOT dpkg_description STREQUAL "library description")
+      set(expected_description "main description 2\n  library description")
+      if(NOT dpkg_description STREQUAL expected_description)
         set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
-                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: ${dpkg_description} != 'main description'")
+                                      "dpkg-deb: ${_f}: Incorrect description for package ${dpkg_package_name}: `${dpkg_description}` != `${expected_description}`")
       endif()
     else()
       set(dpkgdeb_output_errors_all ${dpkgdeb_output_errors_all}
diff --git a/Tests/CPackComponentsDEB/RunCPackVerifyResult.cmake b/Tests/CPackComponentsDEB/RunCPackVerifyResult.cmake
index 2093e7e..b172da2 100644
--- a/Tests/CPackComponentsDEB/RunCPackVerifyResult.cmake
+++ b/Tests/CPackComponentsDEB/RunCPackVerifyResult.cmake
@@ -200,4 +200,29 @@ function(dpkgdeb_return_specific_metaentry output)
   endif()
 endfunction()
 
+function(get_package_description DPKG_OUTPUT RESULT_VAR)
+  string(UUID uuid NAMESPACE 00000000-0000-0000-0000-000000000000 TYPE SHA1)
+  string(REPLACE ";" "${uuid}" DPKG_OUTPUT "${DPKG_OUTPUT}")
+  string(REPLACE "\n" ";" DPKG_OUTPUT "${DPKG_OUTPUT}")
+
+  unset(_actual_description)
+  set(_parse_description FALSE)
+  foreach(_line IN LISTS DPKG_OUTPUT)
+    if(_line MATCHES " Description:.*")
+      set(_parse_description TRUE)
+      string(REPLACE " Description: " "" _line "${_line}")
+      list(APPEND _actual_description "${_line}")
+    elseif(_parse_description)
+      if(_line MATCHES " [A-Z][A-Za-z\-]+: .*")
+        set(_parse_description FALSE)
+      else()
+        list(APPEND _actual_description "${_line}")
+      endif()
+    endif()
+  endforeach()
+  list(JOIN _actual_description "\n" _actual_description)
+
+  set(${RESULT_VAR} "${_actual_description}" PARENT_SCOPE)
+endfunction()
+
 cmake_policy(POP)
diff --git a/Tests/RunCMake/CMakeLists.txt b/Tests/RunCMake/CMakeLists.txt
index 8fd5234..13fbecf 100644
--- a/Tests/RunCMake/CMakeLists.txt
+++ b/Tests/RunCMake/CMakeLists.txt
@@ -510,6 +510,7 @@ set(cpack_tests
   DEB.TIMESTAMPS
   DEB.MD5SUMS
   DEB.DEB_PACKAGE_VERSION_BACK_COMPATIBILITY
+  DEB.DEB_DESCRIPTION
 
   RPM.CUSTOM_BINARY_SPEC_FILE
   RPM.CUSTOM_NAMES
diff --git a/Tests/RunCMake/CPack/RunCMakeTest.cmake b/Tests/RunCMake/CPack/RunCMakeTest.cmake
index 8e98961..b0b7a99 100644
--- a/Tests/RunCMake/CPack/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CPack/RunCMakeTest.cmake
@@ -39,3 +39,10 @@ run_cpack_test_subtests(EXTERNAL "none;good;good_multi;bad_major;bad_minor;inval
 if(RunCMake_GENERATOR MATCHES "Visual Studio|Xcode")
   run_cpack_test(CPACK_INSTALL_CMAKE_CONFIGURATIONS "ZIP" false "MONOLITHIC")
 endif()
+run_cpack_test_subtests(
+  DEB_DESCRIPTION
+  "CPACK_DEBIAN_PACKAGE_DESCRIPTION;CPACK_PACKAGE_DESCRIPTION;CPACK_PACKAGE_DESCRIPTION_FILE"
+  "DEB.DEB_DESCRIPTION"
+  false
+  "MONOLITHIC;COMPONENT"
+)
diff --git a/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/ExpectedFiles.cmake b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/ExpectedFiles.cmake
new file mode 100644
index 0000000..39f18a3
--- /dev/null
+++ b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/ExpectedFiles.cmake
@@ -0,0 +1,16 @@
+set(EXPECTED_FILES_COUNT_MONOLITHIC "1")
+set(EXPECTED_FILES_COUNT_COMPONENT "2")
+set(EXPECTED_FILES_COUNT "${EXPECTED_FILES_COUNT_${PACKAGING_TYPE}}")
+
+if(PACKAGING_TYPE STREQUAL "COMPONENT")
+  set(EXPECTED_FILE_1 "deb_description-0.1.1-*-satu.deb")
+  set(EXPECTED_FILE_2 "deb_description-0.1.1-*-dua.deb")
+  set(EXPECTED_FILE_CONTENT_1_LIST "/satu;/satu/CMakeLists.txt")
+  set(EXPECTED_FILE_CONTENT_2_LIST "/dua;/dua/CMakeLists.txt")
+
+elseif(PACKAGING_TYPE STREQUAL "MONOLITHIC")
+  set(EXPECTED_FILE_CONTENT_1_LIST "/dua;/dua/CMakeLists.txt;/satu;/satu/CMakeLists.txt")
+
+endif()
+
+# kate: indent-width 2;
diff --git a/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/VerifyResult.cmake b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/VerifyResult.cmake
new file mode 100644
index 0000000..e9ac13a
--- /dev/null
+++ b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/VerifyResult.cmake
@@ -0,0 +1,65 @@
+function(checkPackageDescription FILE EXPECTED_DESCRIPTION)
+  getPackageInfo("${FILE}" "_file_info")
+  string(UUID uuid NAMESPACE 00000000-0000-0000-0000-000000000000 TYPE SHA1)
+  string(REPLACE ";" "${uuid}" _file_info "${_file_info}")
+  string(REPLACE ";" "${uuid}" EXPECTED_DESCRIPTION "${EXPECTED_DESCRIPTION}")
+  string(REPLACE "\n" ";" _file_info "${_file_info}")
+
+  set(_actual_description)
+  set(_parse_description FALSE)
+  foreach(_line IN LISTS _file_info)
+    if(_line MATCHES " Description:.*")
+      set(_parse_description TRUE)
+      list(APPEND _actual_description "${_line}")
+    elseif(_parse_description)
+      if(_line MATCHES " [A-Z][A-Za-z\-]+: .*")
+        set(_parse_description FALSE)
+      else()
+        list(APPEND _actual_description "${_line}")
+      endif()
+    endif()
+  endforeach()
+  list(JOIN _actual_description "\n" _actual_description)
+
+  if(NOT _actual_description STREQUAL EXPECTED_DESCRIPTION)
+    set(_error "---[BEGIN Expected description]---\n${EXPECTED_DESCRIPTION}---[END Expected description]---\n")
+    string(APPEND _error "---[BEGIN Actual description]---\n${_actual_description}---[END Actual description]---\n")
+    string(REPLACE "${uuid}"  ";" _error "${_error}")
+    message(FATAL_ERROR "${_error}")
+  endif()
+endfunction()
+
+# ALERT The output of `dpkg -I *.deb` indented by one space
+set(_expected_description [[ Description: This is the summary line
+  This is the Debian package multiline description.
+  .
+  It must be formatted properly! Otherwise, the result `*.deb`
+  package become broken and cant be installed!
+  .
+  It may contains `;` characters (even like this `;;;;`). Example:
+  .
+    - one;
+    - two;
+    - three;
+  .
+  ... and they are properly handled by the automatic description formatter!
+  .
+  See also: https://www.debian.org/doc/debian-policy/ch-controlfields.html#description]])
+
+# ATTENTION The code in `cmCPackGenerator.cxx` to read `CPACK_PACKAGE_DESCRIPTION_FILE`
+# has a BUG: it appends the `\n` character to every line of the
+# input, even if there was no EOL (e.g. at the last line of the file).
+# That is WHY for this sub-test the one more pre-formatted "empty"
+# line required!
+# NOTE For component based installers content of the file gonna read by
+# `CPackDeb` module and the `file(READ...)` command so no the mentioned
+# workaround required!
+if(RunCMake_SUBTEST_SUFFIX STREQUAL "CPACK_PACKAGE_DESCRIPTION_FILE" AND PACKAGING_TYPE STREQUAL "MONOLITHIC")
+  string(APPEND _expected_description "\n  ." )
+endif()
+
+foreach(_file_no RANGE 1 ${EXPECTED_FILES_COUNT})
+  checkPackageDescription("${FOUND_FILE_${_file_no}}" "${_expected_description}")
+endforeach()
+
+# kate: indent-width 2;
diff --git a/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/test.cmake b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/test.cmake
new file mode 100644
index 0000000..ce3f651
--- /dev/null
+++ b/Tests/RunCMake/CPack/tests/DEB_DESCRIPTION/test.cmake
@@ -0,0 +1,45 @@
+install(FILES CMakeLists.txt DESTINATION satu COMPONENT satu)
+install(FILES CMakeLists.txt DESTINATION dua COMPONENT dua)
+
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "This is the summary line")
+set(_description [[This is the Debian package multiline description.
+
+It must be formatted properly! Otherwise, the result `*.deb`
+package become broken and cant be installed!
+
+It may contains `;` characters (even like this `;;;;`). Example:
+
+  - one;
+  - two;
+  - three;
+
+... and they are properly handled by the automatic description formatter!
+
+See also: https://www.debian.org/doc/debian-policy/ch-controlfields.html#description]])
+
+if(RunCMake_SUBTEST_SUFFIX STREQUAL "CPACK_DEBIAN_PACKAGE_DESCRIPTION")
+  if(PACKAGING_TYPE STREQUAL "COMPONENT")
+    set(CPACK_DEBIAN_SATU_DESCRIPTION "${_description}")
+    set(CPACK_DEBIAN_DUA_DESCRIPTION "${_description}")
+  else()
+    set(CPACK_DEBIAN_PACKAGE_DESCRIPTION "${_description}")
+  endif()
+
+elseif(RunCMake_SUBTEST_SUFFIX STREQUAL "CPACK_PACKAGE_DESCRIPTION")
+  # NOTE Documented fallback variable
+  if(PACKAGING_TYPE STREQUAL "COMPONENT")
+    set(CPACK_COMPONENT_SATU_DESCRIPTION "${_description}")
+    set(CPACK_COMPONENT_DUA_DESCRIPTION "${_description}")
+  else()
+    set(CPACK_PACKAGE_DESCRIPTION "${_description}")
+  endif()
+
+elseif(RunCMake_SUBTEST_SUFFIX STREQUAL "CPACK_PACKAGE_DESCRIPTION_FILE")
+  # NOTE Getting the description from the file
+  set(_file "${CMAKE_CURRENT_BINARY_DIR}/description.txt")
+  file(WRITE "${_file}" "${_description}")
+  set(CPACK_PACKAGE_DESCRIPTION_FILE "${_file}")
+
+endif()
+
+# kate: indent-width 2;
diff --git a/Tests/RunCMake/CPack/tests/PER_COMPONENT_FIELDS/VerifyResult.cmake b/Tests/RunCMake/CPack/tests/PER_COMPONENT_FIELDS/VerifyResult.cmake
index b4bdb61..c47b40e 100644
--- a/Tests/RunCMake/CPack/tests/PER_COMPONENT_FIELDS/VerifyResult.cmake
+++ b/Tests/RunCMake/CPack/tests/PER_COMPONENT_FIELDS/VerifyResult.cmake
@@ -8,6 +8,9 @@ endfunction()
 if(GENERATOR_TYPE STREQUAL "DEB")
   set(name_ "Package")
   set(group_ "Section")
+  # NOTE For a Debian package the first line of the `Description`
+  # field is generated by CMake and gonna be ignored
+  set(ignore_rest_cond_ ".*\n")
 elseif(GENERATOR_TYPE STREQUAL "RPM")
   set(name_ "Name")
   set(group_ "Group")
@@ -33,6 +36,6 @@ if(GENERATOR_TYPE STREQUAL "RPM")
 endif()
 
 # check package description
-checkPackageInfo_("description" "${FOUND_FILE_1}" ".*Description${whitespaces_}:${whitespaces_}Description for pkg_1")
-checkPackageInfo_("description" "${FOUND_FILE_2}" ".*Description${whitespaces_}:${whitespaces_}Description for pkg_2")
-checkPackageInfo_("description" "${FOUND_FILE_3}" ".*Description${whitespaces_}:${whitespaces_}Description for pkg_3")
+checkPackageInfo_("description" "${FOUND_FILE_1}" ".*Description${whitespaces_}:${ignore_rest_cond_}${whitespaces_}Description for pkg_1")
+checkPackageInfo_("description" "${FOUND_FILE_2}" ".*Description${whitespaces_}:${ignore_rest_cond_}${whitespaces_}Description for pkg_2")
+checkPackageInfo_("description" "${FOUND_FILE_3}" ".*Description${whitespaces_}:${ignore_rest_cond_}${whitespaces_}Description for pkg_3")