[PATCH] kbuild: fix package build error due to broken symlinks

[Masahiro Yamada <masahiroy@kernel.org>]

'make deb-pkg' and 'make rpm-pkg' fail if a broken symlink exists in
a dirty source tree. Handle symlinks properly, and also, keep the
executable permission.

Fixes: 05e96e96a315 ("kbuild: use git-archive for source package creation")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

 scripts/package/gen-diff-patch | 36 +++++++++++++++++++++++++---------
 1 file changed, 27 insertions(+), 9 deletions(-)

diff --git a/scripts/package/gen-diff-patch b/scripts/package/gen-diff-patch
index f842ab50a780..23551de92e1b 100755
--- a/scripts/package/gen-diff-patch
+++ b/scripts/package/gen-diff-patch
@@ -23,16 +23,34 @@ fi
 git -C ${srctree} status --porcelain --untracked-files=all |
 while read stat path
 do
-	if [ "${stat}" = '??' ]; then
-
-		if ! diff -u /dev/null "${srctree}/${path}" > .tmp_diff &&
-			! head -n1 .tmp_diff | grep -q "Binary files"; then
-			{
-				echo "--- /dev/null"
-				echo "+++ linux/$path"
-				cat .tmp_diff | tail -n +3
-			} >> ${untracked_patch}
+	if [ "${stat}" != '??' ]; then
+		continue
+	fi
+
+	if [ -L "${path}" ]; then
+		{
+			echo "diff --git a/${path} b/${path}"
+			echo "new file mode 120000"
+			echo "--- /dev/null"
+			echo "+++ b/$path"
+			echo "@@ -0,0 +1 @@"
+			printf "+"; readlink ${path}
+			echo '\ No newline at end of file'
+		} >> ${untracked_patch}
+	elif ! diff -u /dev/null "${srctree}/${path}" > .tmp_diff &&
+	     ! head -n1 .tmp_diff | grep -q "Binary files"; then
+		if [ -x ${path} ]; then
+			mode=100755
+		else
+			mode=100644
 		fi
+		{
+			echo "diff --git a/${path} b/${path}"
+			echo "new file mode ${mode}"
+			echo "--- /dev/null"
+			echo "+++ b/$path"
+			cat .tmp_diff | tail -n +3
+		} >> ${untracked_patch}
 	fi
 done
 
-- 
2.34.1