dkms: warn if some.ko disappears in the strip/sign/compress/copy loop

We have already checked that the module had been built successfully.
If it disappears during the strip/sign/compress/copy loop, there must be
a duplicate entry in dkms.conf. Skip further operations on the missing
file to avoid excessive error message noise.

Author: anbe42

dkms.in

@@ -1367,6 +1367,11 @@ prepare_and_actual_build()
         built_module="$the_module$module_uncompressed_suffix"
         compressed_module="$the_module$module_suffix"
 
+        if [[ ! -f $built_module ]]; then
+            warn "$built_module has disappeared"
+            continue
+        fi
+
         if [[ ${strip[$count]} != no ]] && [[ ${CC} == "clang" ]]; then
             llvm-strip -g "$built_module"
         elif [[ ${strip[$count]} != no ]]; then

run_test.sh

@@ -374,13 +374,6 @@ case "${os_id}" in
         ;;
 esac
 
-mod_compressor=
-case "${mod_compression_ext}" in
-    .gz)    mod_compressor=gzip ;;
-    .xz)    mod_compressor=xz ;;
-    .zst)   mod_compressor=zst ;;
-esac
-
 echo "Checking module compression ..."
 echo "config: $(grep "^CONFIG_MODULE_COMPRESS" "${kernel_config}" || true)"
 echo "files: $(find "/lib/modules/${KERNEL_VER}" -name \*.ko\* 2>/dev/null | head -n1)"
@@ -2762,9 +2755,7 @@ EOF
 echo ' Building and installing the test module'
 set_signing_message "dkms_duplicate_test" "1.0"
 if [[ ${mod_compression_ext} ]]; then
-BUILD_MESSAGES="${SIGNING_MESSAGE}strip: '/var/lib/dkms/dkms_duplicate_test/1.0/build/dkms_duplicate_test.ko': No such file
-${SIGNING_MESSAGE}${mod_compressor}: /var/lib/dkms/dkms_duplicate_test/1.0/build/dkms_duplicate_test.ko: No such file or directory
-cp: cannot stat '/var/lib/dkms/dkms_duplicate_test/1.0/build/dkms_duplicate_test.ko': No such file or directory
+BUILD_MESSAGES="${SIGNING_MESSAGE}Warning: /var/lib/dkms/dkms_duplicate_test/1.0/build/dkms_duplicate_test.ko has disappeared
 "
 else
 BUILD_MESSAGES="${SIGNING_MESSAGE}${SIGNING_MESSAGE}"