kbuild: use git-archive for source package creation

Commit 5c3d1d0abb12 ("kbuild: add a tool to list files ignored by git")
added a new tool, scripts/list-gitignored. My intention was to create
source packages without cleaning the source tree, without relying on git.

Linus strongly objected to it, and suggested using 'git archive' instead.
[1] [2] [3]

This commit goes in that direction - Remove scripts/list-gitignored.c
and rewrites Makefiles and scripts to use 'git archive' for building
Debian and RPM source packages. It also makes 'make perf-tar*-src-pkg'
use 'git archive' again.

Going forward, building source packages is only possible in a git-managed
tree. Building binary packages does not require git.

[1]: https://lore.kernel.org/lkml/CAHk-=wi49sMaC7vY1yMagk7eqLK=1jHeHQ=yZ_k45P=xBccnmA@mail.gmail.com/
[2]: https://lore.kernel.org/lkml/CAHk-=wh5AixGsLeT0qH2oZHKq0FLUTbyTw4qY921L=PwYgoGVw@mail.gmail.com/
[3]: https://lore.kernel.org/lkml/CAHk-=wgM-W6Fu==EoAVCabxyX8eYBz9kNC88-tm9ExRQwA79UQ@mail.gmail.com/

Fixes: 5c3d1d0abb12 ("kbuild: add a tool to list files ignored by git")
Fixes: e0ca16749ac3 ("kbuild: make perf-tar*-src-pkg work without relying on git")
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/scripts/package/gen-diff-patch b/scripts/package/gen-diff-patch
new file mode 100755
index 000000000000..f842ab50a780
--- /dev/null
+++ b/scripts/package/gen-diff-patch
@@ -0,0 +1,44 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-only
+
+diff_patch="${1}"
+untracked_patch="${2}"
+srctree=$(dirname $0)/../..
+
+rm -f ${diff_patch} ${untracked_patch}
+
+if ! ${srctree}/scripts/check-git; then
+	exit
+fi
+
+mkdir -p "$(dirname ${diff_patch})" "$(dirname ${untracked_patch})"
+
+git -C "${srctree}" diff HEAD > "${diff_patch}"
+
+if [ ! -s "${diff_patch}" ]; then
+	rm -f "${diff_patch}"
+	exit
+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
+			} >> ${untracked_patch}
+		fi
+	fi
+done
+
+rm -f .tmp_diff
+
+if [ ! -s "${diff_patch}" ]; then
+	rm -f "${diff_patch}"
+	exit
+fi