CPack: CMAKE_PROJECT_HOMEPAGE_URL -> CPACK_PACKAGE_HOMEPAGE_URL

At CPack running time the `CMAKE_PROJECT_HOMEPAGE_URL` variable
is not set.

Internal CPack modules (e.g. CPackDEB, CPackRPM, CPackFreeBSD)
should use `CPACK_PACKAGE_HOMEPAGE_URL` instead, which is available
after inclusion of `CPack.cmake` into `CMakeLists.txt`.

Closes: #19607

Modules/Internal/CPack/CPackDeb.cmake

@@ -546,8 +546,8 @@ function(cpack_deb_prepare_package_vars)
   )
 
   # Homepage: (optional)
-  if(NOT CPACK_DEBIAN_PACKAGE_HOMEPAGE AND CMAKE_PROJECT_HOMEPAGE_URL)
-    set(CPACK_DEBIAN_PACKAGE_HOMEPAGE "${CMAKE_PROJECT_HOMEPAGE_URL}")
+  if(NOT CPACK_DEBIAN_PACKAGE_HOMEPAGE AND CPACK_PACKAGE_HOMEPAGE_URL)
+    set(CPACK_DEBIAN_PACKAGE_HOMEPAGE "${CPACK_PACKAGE_HOMEPAGE_URL}")
   endif()
 
   # Section: (recommended)

Modules/Internal/CPack/CPackFreeBSD.cmake

@@ -68,7 +68,7 @@ _cpack_freebsd_fallback_var("CPACK_FREEBSD_PACKAGE_DESCRIPTION"
 # There's really only one homepage for a project, so
 # re-use the Debian setting if it's there.
 _cpack_freebsd_fallback_var("CPACK_FREEBSD_PACKAGE_WWW"
-    "CMAKE_PROJECT_HOMEPAGE_URL"
+    "CPACK_PACKAGE_HOMEPAGE_URL"
     "CPACK_DEBIAN_PACKAGE_HOMEPAGE"
     "_cpack_freebsd_fallback_www"
     )

Modules/Internal/CPack/CPackRPM.cmake

@@ -844,8 +844,8 @@ function(cpack_rpm_generate_package)
     endif()
   endif()
 
-  if(NOT CPACK_RPM_PACKAGE_URL AND CMAKE_PROJECT_HOMEPAGE_URL)
-    set(CPACK_RPM_PACKAGE_URL "${CMAKE_PROJECT_HOMEPAGE_URL}")
+  if(NOT CPACK_RPM_PACKAGE_URL AND CPACK_PACKAGE_HOMEPAGE_URL)
+    set(CPACK_RPM_PACKAGE_URL "${CPACK_PACKAGE_HOMEPAGE_URL}")
   endif()
 
   # CPACK_RPM_PACKAGE_NAME (mandatory)

Tests/RunCMake/CMakeLists.txt

@@ -553,6 +553,7 @@ set(cpack_tests
   DEB.MD5SUMS
   DEB.DEB_PACKAGE_VERSION_BACK_COMPATIBILITY
   DEB.DEB_DESCRIPTION
+  DEB.PROJECT_META
 
   RPM.CUSTOM_BINARY_SPEC_FILE
   RPM.CUSTOM_NAMES
@@ -573,6 +574,7 @@ set(cpack_tests
   RPM.SUGGESTS
   RPM.SYMLINKS
   RPM.USER_FILELIST
+  RPM.PROJECT_META
 
   7Z
   TBZ2

Tests/RunCMake/CPack/RunCMakeTest.cmake

@@ -46,3 +46,4 @@ run_cpack_test_subtests(
   false
   "MONOLITHIC;COMPONENT"
 )
+run_cpack_test(PROJECT_META "RPM.PROJECT_META;DEB.PROJECT_META" false "MONOLITHIC;COMPONENT")

Tests/RunCMake/CPack/tests/PROJECT_META/ExpectedFiles.cmake

@@ -0,0 +1,9 @@
+if(GENERATOR_TYPE STREQUAL DEB)
+  set(EXPECTED_FILE_1 "project_meta-1.2.3*.deb")
+elseif(GENERATOR_TYPE STREQUAL RPM)
+  set(EXPECTED_FILE_1 "project_meta-1.2.3*.rpm")
+else()
+  message(FATAL_ERROR "Unexpected CPack generator")
+endif()
+set(EXPECTED_FILES_COUNT "1")
+set(EXPECTED_FILE_CONTENT_1_LIST "/foo;/foo/CMakeLists.txt")

Tests/RunCMake/CPack/tests/PROJECT_META/VerifyResult.cmake

@@ -0,0 +1,30 @@
+function(checkPackageURL FILE TAG EXPECTED_URL)
+  getPackageInfo("${FILE}" "_file_info")
+  string(REPLACE "\n" ";" _file_info "${_file_info}")
+
+  set(_seen_url FALSE)
+  foreach(_line IN LISTS _file_info)
+    if(_line MATCHES "${TAG}: (.*)")
+      set(_seen_url TRUE)
+      if(NOT CMAKE_MATCH_1 STREQUAL EXPECTED_URL)
+        message(FATAL_ERROR "Unexpected `Homepage` URL: `${CMAKE_MATCH_1}` != `${EXPECTED_URL}`")
+      endif()
+      break()
+    endif()
+  endforeach()
+  if(NOT _seen_url)
+    message(FATAL_ERROR "The packge `${FILE}` do not have URL as expected")
+  endif()
+endfunction()
+
+if(GENERATOR_TYPE STREQUAL DEB)
+  set(_tag " Homepage") # NOTE The leading space
+elseif(GENERATOR_TYPE STREQUAL RPM)
+  set(_tag "URL.*")
+else()
+  message(FATAL_ERROR "Unexpected CPack generator")
+endif()
+
+checkPackageURL("${FOUND_FILE_1}" "${_tag}" "https://meta.test.info")
+
+# kate: indent-width 2;

Tests/RunCMake/CPack/tests/PROJECT_META/test.cmake

@@ -0,0 +1,11 @@
+project(
+  MetaInfoTest
+  VERSION 1.2.3
+  DESCRIPTION "This is going to be a summary"
+  HOMEPAGE_URL "https://meta.test.info"
+)
+install(FILES CMakeLists.txt DESTINATION foo COMPONENT test)
+
+if(PACKAGING_TYPE STREQUAL "COMPONENT")
+  set(CPACK_COMPONENTS_ALL test)
+endif()