From c1eb37b193600d22833714f84f8c74776d741a76 Mon Sep 17 00:00:00 2001
From: Scarlett Clark <scarlett.gately.clark@gmail.com>
Date: Sun, 27 Sep 2020 19:29:31 +0200
Subject: Make KDEPackageAppTemplates to create reproducible tarball.

By default tar glues files in a random order together, this makes the
output non reproducible. In order to fix, produce a sorted output and
uniquify user/group and chmod.
---
 kde-modules/KDEPackageAppTemplates.cmake | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/kde-modules/KDEPackageAppTemplates.cmake b/kde-modules/KDEPackageAppTemplates.cmake
index 54fb6fa6..7f9feeb5 100644
--- a/kde-modules/KDEPackageAppTemplates.cmake
+++ b/kde-modules/KDEPackageAppTemplates.cmake
@@ -107,11 +107,20 @@ function(kde_package_app_templates)
 
         add_custom_target(${_baseName} ALL DEPENDS ${_template})
 
-        add_custom_command(OUTPUT ${_template}
-             COMMAND ${CMAKE_COMMAND} -E tar "cvfj" ${_template} .
-             WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${_templateName}
-        )
-
+        if(GNU_TAR_FOUND)
+            # Make tar archive reproducible, the arguments are only available on UNIX like systems
+            add_custom_command(OUTPUT ${_template}
+                 COMMAND tar ARGS -c ${CMAKE_CURRENT_SOURCE_DIR}/${_templateName}
+                    --exclude .kdev_ignore --exclude .svn --sort=name --mode=go=rX,u+rw,a-s --owner=root
+                    --group=root --numeric-owner -j -v -f ${_template} .
+                 WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${_templateName}
+            )
+        else()
+            add_custom_command(OUTPUT ${_template}
+                COMMAND ${CMAKE_COMMAND} -E tar "cvfj" ${_template} .
+                WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/${_templateName}
+            )
+        endif()
 
         install(FILES ${_template} DESTINATION ${ARG_INSTALL_DIR})
         set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES "${_template}")
-- 
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