Avoid unnecessary initramfs rebuilds

Fixes a bug, plus adds a line of output that explains why a rebuild
was needed.

1 files changed, 5 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index 4f75fe9..5596f5d 100644
--- a/Makefile
+++ b/Makefile
@@ -105,6 +105,8 @@ install-submodules-stamp: install-submodules
 install-bin-programs: ${bin_programs}
         install -p ${bin_programs} ${instdir}${samizdat_bindir}
 
+CP=cp --preserve=timestamps -r
+
 install-stamp: install-bin-programs samizdat-paths.sh ${compiled_programs}
         mkdir -p ${instdir}${samizdat_initrd_files_dir}
         mkdir -p ${instdir}${samizdat_child_dir}
@@ -112,7 +114,7 @@ install-stamp: install-bin-programs samizdat-paths.sh ${compiled_programs}
         mkdir -p ${instdir}${samizdat_initramfs_conf_dir}
         mkdir -p ${instdir}${samizdat_isolinux_dir}
         mkdir -p ${instdir}${samizdat_linux_dir}
-        cp -r ${initrd_files} ${instdir}${samizdat_initrd_files_dir}
-        cp -r ${initramfs_conf_files} ${instdir}${samizdat_initramfs_conf_dir}
-        cp -r ${isolinux_files} ${instdir}${samizdat_isolinux_dir}
+        $(CP) ${initrd_files} ${instdir}${samizdat_initrd_files_dir}
+        $(CP) ${initramfs_conf_files} ${instdir}${samizdat_initramfs_conf_dir}
+        $(CP) ${isolinux_files} ${instdir}${samizdat_isolinux_dir}
         touch $@