linux-kernel - [PATCH 5/7] builddeb: Enable rootless builds

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Date:   Mon, 21 Sep 2020 00:25:54 +0200
From:   Guillem Jover <guillem@...rons.org>
To:     linux-kbuild@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 5/7] builddeb: Enable rootless builds

This makes it possible to build the Debian packages without requiring
(pseudo-)root privileges, when the build drivers support this mode
of operation.

See-Also: /usr/share/doc/dpkg/rootless-builds.txt.gz
Signed-off-by: Guillem Jover <guillem@...rons.org>
---
 scripts/package/builddeb | 9 +++++++--
 scripts/package/mkdebian | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index b14abbe5afbb..d428c0945d4b 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -26,6 +26,7 @@ if_enabled_echo() {
 
 create_package() {
 	local pname="$1" pdir="$2"
+	local dpkg_deb_opts
 
 	mkdir -m 755 -p "$pdir/DEBIAN"
 	mkdir -p "$pdir/usr/share/doc/$pname"
@@ -36,14 +37,18 @@ create_package() {
 		| xargs -r0 md5sum > DEBIAN/md5sums"
 
 	# Fix ownership and permissions
-	chown -R root:root "$pdir"
+	if [ "$DEB_RULES_REQUIRES_ROOT" = "no" ]; then
+		dpkg_deb_opts="--root-owner-group"
+	else
+		chown -R root:root "$pdir"
+	fi
 	chmod -R go-w "$pdir"
 	# in case we are in a restrictive umask environment like 0077
 	chmod -R a+rX "$pdir"
 
 	# Create the package
 	dpkg-gencontrol -p$pname -P"$pdir"
-	dpkg-deb ${KDEB_COMPRESS:+-Z$KDEB_COMPRESS} --build "$pdir" ..
+	dpkg-deb $dpkg_deb_opts ${KDEB_COMPRESS:+-Z$KDEB_COMPRESS} --build "$pdir" ..
 }
 
 deploy_kernel_headers () {
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index dae6c0ec0bd6..b98c382f967a 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -188,6 +188,7 @@ Source: $sourcename
 Section: kernel
 Priority: optional
 Maintainer: $maintainer
+Rules-Requires-Root: no
 Build-Depends: bc, rsync, kmod, cpio, bison, flex | flex:native $extra_build_depends
 Homepage: https://www.kernel.org/
 
-- 
2.28.0.297.g1956fa8f8d