kbuild: use git-archive for source package creation

Commit 5c3d1d0abb ("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: 5c3d1d0abb ("kbuild: add a tool to list files ignored by git")
Fixes: e0ca16749a ("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>

scripts/setlocalversion

@@ -11,10 +11,16 @@
 #
 
 usage() {
-	echo "Usage: $0 [srctree]" >&2
+	echo "Usage: $0 [--no-local] [srctree]" >&2
 	exit 1
 }
 
+no_local=false
+if test "$1" = "--no-local"; then
+	no_local=true
+	shift
+fi
+
 srctree=.
 if test $# -gt 0; then
 	srctree=$1
@@ -26,14 +32,22 @@ fi
 
 scm_version()
 {
-	local short
+	local short=false
+	local no_dirty=false
 	local tag
-	short=false
+
+	while [ $# -gt 0 ];
+	do
+		case "$1" in
+		--short)
+			short=true;;
+		--no-dirty)
+			no_dirty=true;;
+		esac
+		shift
+	done
 
 	cd "$srctree"
-	if test "$1" = "--short"; then
-		short=true
-	fi
 
 	if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then
 		return
@@ -75,6 +89,10 @@ scm_version()
 		printf '%s%s' -g "$(echo $head | cut -c1-12)"
 	fi
 
+	if ${no_dirty}; then
+		return
+	fi
+
 	# Check for uncommitted changes.
 	# This script must avoid any write attempt to the source tree, which
 	# might be read-only.
@@ -110,11 +128,6 @@ collect_files()
 	echo "$res"
 }
 
-if ! test -e include/config/auto.conf; then
-	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
-	exit 1
-fi
-
 if [ -z "${KERNELVERSION}" ]; then
 	echo "KERNELVERSION is not set" >&2
 	exit 1
@@ -126,6 +139,16 @@ if test ! "$srctree" -ef .; then
 	file_localversion="${file_localversion}$(collect_files "$srctree"/localversion*)"
 fi
 
+if ${no_local}; then
+	echo "${KERNELVERSION}$(scm_version --no-dirty)"
+	exit 0
+fi
+
+if ! test -e include/config/auto.conf; then
+	echo "Error: kernelrelease not valid - run 'make prepare' to update it" >&2
+	exit 1
+fi
+
 # version string from CONFIG_LOCALVERSION
 config_localversion=$(sed -n 's/^CONFIG_LOCALVERSION=\(.*\)$/\1/p' include/config/auto.conf)