linux-kernel - [PATCH v6 06/12] kbuild: deb-pkg: make .orig tarball a hard link if possible

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Date:   Wed, 15 Feb 2023 10:20:28 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>
Subject: [PATCH v6 06/12] kbuild: deb-pkg: make .orig tarball a hard link if possible

If '..' belongs to the same filesystem, create a hard link instead of
a copy. In most cases, you can save disk space.

I do not want to use 'mv' because keeping linux.tar.gz is useful to
avoid unneeded rebuilding of the tarball.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

Changes in v6:
  - New patch

 scripts/Makefile.package | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.package b/scripts/Makefile.package
index c207f4ec47ac..80a96eb61426 100644
--- a/scripts/Makefile.package
+++ b/scripts/Makefile.package
@@ -96,7 +96,11 @@ debian-orig: private source = $(shell dpkg-parsechangelog -S Source)
 debian-orig: private version = $(shell dpkg-parsechangelog -S Version | sed 's/-[^-]*$$//')
 debian-orig: private orig-name = $(source)_$(version).orig.tar.gz
 debian-orig: linux.tar.gz debian
-	$(Q)cp $< ../$(orig-name)
+	$(Q)if [ "$(df  --output=target .. 2>/dev/null)" = "$(df --output=target $< 2>/dev/null)" ]; then \
+		ln -f $< ../$(orig-name); \
+	else \
+		cp $< ../$(orig-name); \
+	fi
 
 PHONY += deb-pkg
 deb-pkg: debian-orig
-- 
2.34.1