[RFC Kernel PATCH 1/1] builddeb: support creation of linux-perf packages

[Cedric Hombourger <Cedric_Hombourger@mentor.com>]

Provide a mechanism for the Debian package generation scripts to also
produce perf packages in addition to the kernel packages. Pass KDEB_PERF=1
to the "make deb-pkg" command line. The structure of the packages should
match very closely with Debian's with the perf binary and support folders
suffixed with the kernel version number (Debian's /usr/bin/perf script
checks the running kernel to spawn the corresponding perf_<version>
binary). It shall also be noted that it is left to the user to specify
runtime dependencies via the added KDEB_PERF_DEPS variable. They are
indeed distro and environment specific (perf determines what features
should be compiled in after checking packages installed on the build host)

Signed-off-by: Cedric Hombourger <Cedric_Hombourger@mentor.com>
---
 scripts/package/builddeb | 32 ++++++++++++++++++++++++++++++++
 scripts/package/mkdebian | 26 ++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index c4c580f547ef..76c9c49a678f 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -51,6 +51,8 @@ tmpdir="$objtree/debian/tmp"
 kernel_headers_dir="$objtree/debian/hdrtmp"
 libc_headers_dir="$objtree/debian/headertmp"
 dbg_dir="$objtree/debian/dbgtmp"
+perf_dir="$objtree/debian/linux-perf-tmp"
+perf_xy_dir="$objtree/debian/linux-perf-$VERSION.$PATCHLEVEL-tmp"
 packagename=linux-image-$version
 kernel_headers_packagename=linux-headers-$version
 libc_headers_packagename=linux-libc-dev
@@ -78,6 +80,7 @@ BUILD_DEBUG=$(if_enabled_echo CONFIG_DEBUG_INFO Yes)
 
 # Setup the directory structure
 rm -rf "$tmpdir" "$kernel_headers_dir" "$libc_headers_dir" "$dbg_dir" $objtree/debian/files
+rm -rf "$perf_dir" "$perf_xy_dir"
 mkdir -m 755 -p "$tmpdir/DEBIAN"
 mkdir -p "$tmpdir/lib" "$tmpdir/boot"
 mkdir -p "$kernel_headers_dir/lib/modules/$version/"
@@ -129,6 +132,30 @@ if is_enabled CONFIG_MODULES; then
 	fi
 fi
 
+if [ -n "$KDEB_PERF" ]; then
+	mkdir -p $perf_dir $perf_xy_dir
+	$MAKE -C tools/perf -f Makefile.perf						\
+		DESTDIR="$(readlink -f $perf_xy_dir)"					\
+		STRACE_GROUPS_DIR=share/perf_$VERSION.$PATCHLEVEL-core/strace/groups	\
+		LDFLAGS=								\
+		prefix=/usr								\
+		perf_examples_dir=share/doc/linux-perf-$VERSION.$PATCHLEVEL/examples	\
+		perf_include_dir=include/perf_$VERSION.$PATCHLEVEL			\
+		perfexecdir=lib/perf_$VERSION.$PATCHLEVEL-core				\
+		plugindir=/usr/lib/traceevent_$VERSION.$PATCHLEVEL/plugins		\
+		srctree=$(pwd)								\
+		tipdir=share/doc/linux-perf-$VERSION.$PATCHLEVEL			\
+		install
+	mv $perf_xy_dir/etc/bash_completion.d/perf					\
+		$perf_xy_dir/etc/bash_completion.d/perf_$VERSION.$PATCHLEVEL
+	mv $perf_xy_dir/usr/bin/perf $perf_xy_dir/usr/bin/perf_$VERSION.$PATCHLEVEL
+	rm -f $perf_xy_dir/usr/bin/trace
+	for p in $perf_xy_dir/usr/bin/perf-*; do
+		[ -f $p ] || continue
+		mv $p $perf_xy_dir/usr/lib/perf_$VERSION.$PATCHLEVEL-core/
+	done
+fi
+
 if [ "$ARCH" != "um" ]; then
 	$MAKE -f $srctree/Makefile headers
 	$MAKE -f $srctree/Makefile headers_install INSTALL_HDR_PATH="$libc_headers_dir/usr"
@@ -191,6 +218,11 @@ fi
 
 create_package "$packagename" "$tmpdir"
 
+if [ -n "$KDEB_PERF" ]; then
+	create_package "linux-perf-$VERSION.$PATCHLEVEL" "$perf_xy_dir"
+	forcearch="-DArchitecture=all" create_package "linux-perf" "$perf_dir"
+fi
+
 if [ -n "$BUILD_DEBUG" ] ; then
 	# Build debug package
 	# Different tools want the image in different locations
diff --git a/scripts/package/mkdebian b/scripts/package/mkdebian
index e0750b70453f..a5826b634509 100755
--- a/scripts/package/mkdebian
+++ b/scripts/package/mkdebian
@@ -207,10 +207,36 @@ Description: Linux kernel debugging symbols for $version
  all the necessary debug symbols for the kernel and its modules.
 EOF
 
+[ -n "${KDEB_PERF}" ] && cat <<EOF >> debian/control
+
+Package: linux-perf
+Section: devel
+Architecture: all
+Depends: linux-perf-${VERSION}.${PATCHLEVEL}
+Description: Performance analysis tools for Linux (meta-package)
+ This package depends on the package containing the 'perf' performance analysis
+ tools for the latest Linux kernel.
+
+Package: linux-perf-${VERSION}.${PATCHLEVEL}
+Section: devel
+Architecture: $debarch
+Depends: ${KDEB_PERF_DEPS}
+Description: Performance analysis tools for Linux $version
+ This package contains the 'perf' performance analysis tools for Linux kernel
+ version $version
+EOF
+
 cat <<EOF > debian/rules
 #!$(command -v $MAKE) -f
 
 srctree ?= .
+EOF
+
+[ -n "${KDEB_PERF}" ] && cat <<EOF >> debian/rules
+export KDEB_PERF=${KDEB_PERF}
+EOF
+
+cat <<EOF >> debian/rules
 
 build:
 	\$(MAKE) KERNELRELEASE=${version} ARCH=${ARCH} \
-- 
2.11.0