dev-util/bpftool: New package

- This is a standalone bpftool package built from the Linux kernel
  sources, in a similar manner as dev-util/perf

Signed-off-by: Jakov Smolić <jsmolic@gentoo.org>

3 files changed, 132 insertions, 0 deletions

diff --git a/dev-util/bpftool/Manifest b/dev-util/bpftool/Manifest
new file mode 100644
index 000000000000..679a5f7a7e45
--- /dev/null
+++ b/dev-util/bpftool/Manifest
@@ -0,0 +1,2 @@
+DIST linux-5.12.tar.xz 118112412 BLAKE2B 842d921b9a73d2aaade763dbd2ec67bdfe0275baa6d628b775f5c87574ad7dc86f0419afcd48c10c1235f4bffa16084243f2cf4556e6afcd391e975fe8ba530b SHA512 be03b6fee1d1ea8087b09874d27c0a602c0b04fd90ad38b975bd2c8455a07e83c29b56814aaf1389e82305fae0e4c2d1701075a7f0a7295dd28149f967ec5b3d
+DIST patch-5.12.xz 6263608 BLAKE2B cc46642f352e579b073695e8ca23ede26ec84c7f8f79b969aa334a49879d2d5838bb1e3411dae7c1c0584193a4b08aed031eda33b6f38fea4c9b36ed236045d5 SHA512 68f4832e07c152e2df097097720c6adb9103b6a56f5056af67ffa9afbca66ab7c1a94968f638de14d4cd93a077c820f58ffc32952a87721004714339b9d18487
diff --git a/dev-util/bpftool/bpftool-5.12.ebuild b/dev-util/bpftool/bpftool-5.12.ebuild
new file mode 100644
index 000000000000..a5d21696992e
--- /dev/null
+++ b/dev-util/bpftool/bpftool-5.12.ebuild
@@ -0,0 +1,119 @@
+# Copyright 2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit estack linux-info optfeature toolchain-funcs
+
+MY_PV="${PV/_/-}"
+MY_PV="${MY_PV/-pre/-git}"
+
+DESCRIPTION="Tool for inspection and simple manipulation of eBPF programs and maps"
+HOMEPAGE="https://kernel.org/"
+
+LINUX_V="${PV:0:1}.x"
+LINUX_VER=$(ver_cut 1-2)
+LINUX_PATCH=patch-${PV}.xz
+SRC_URI="https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/${LINUX_PATCH}"
+
+LINUX_SOURCES="linux-${LINUX_VER}.tar.xz"
+SRC_URI+=" https://www.kernel.org/pub/linux/kernel/v${LINUX_V}/${LINUX_SOURCES}"
+
+S_K="${WORKDIR}/linux-${LINUX_VER}"
+S="${S_K}/tools/bpf/bpftool"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="caps"
+
+RDEPEND="
+	sys-libs/binutils-libs:=
+	sys-libs/zlib:=
+	virtual/libelf:=
+	caps? ( sys-libs/libcap:= )
+"
+DEPEND="
+	${RDEPEND}
+	>=sys-kernel/linux-headers-5.8
+"
+BDEPEND="
+	${LINUX_PATCH+dev-util/patchutils}
+	dev-python/docutils
+"
+
+CONFIG_CHECK="~DEBUG_INFO_BTF"
+
+# src_unpack and src_prepare are copied from dev-util/perf since
+# it's building from the same tarball, please keep it in sync with perf
+src_unpack() {
+	local paths=(
+		tools/bpf kernel/bpf
+		tools/{arch,build,include,lib,perf,scripts} {scripts,include,lib} "arch/*/lib"
+	)
+
+	# We expect the tar implementation to support the -j option (both
+	# GNU tar and libarchive's tar support that).
+	echo ">>> Unpacking ${LINUX_SOURCES} (${paths[*]}) to ${PWD}"
+	tar --wildcards -xpf "${DISTDIR}"/${LINUX_SOURCES} \
+		"${paths[@]/#/linux-${LINUX_VER}/}" || die
+
+	if [[ -n ${LINUX_PATCH} ]] ; then
+		eshopts_push -o noglob
+		ebegin "Filtering partial source patch"
+		filterdiff -p1 ${paths[@]/#/-i } -z "${DISTDIR}"/${LINUX_PATCH} \
+			> ${P}.patch
+		eend $? || die "filterdiff failed"
+		eshopts_pop
+	fi
+
+	local a
+	for a in ${A}; do
+		[[ ${a} == ${LINUX_SOURCES} ]] && continue
+		[[ ${a} == ${LINUX_PATCH} ]] && continue
+		unpack ${a}
+	done
+}
+
+src_prepare() {
+	default
+
+	if [[ -n ${LINUX_PATCH} ]] ; then
+		pushd "${S_K}" >/dev/null || die
+		eapply "${WORKDIR}"/${P}.patch
+		popd || die
+	fi
+
+	# dev-python/docutils installs rst2man.py, not rst2man
+	sed -i -e 's/rst2man/rst2man.py/g' Documentation/Makefile ../Makefile.helpers || die
+}
+
+bpftool_make() {
+	local arch=$(tc-arch-kernel)
+	tc-export AR CC LD
+
+	emake V=1 VF=1 \
+		HOSTCC="$(tc-getBUILD_CC)" HOSTLD="$(tc-getBUILD_LD)" \
+		EXTRA_CFLAGS="${CFLAGS}" ARCH="${arch}" BPFTOOL_VERSION="${MY_PV}" \
+		prefix="${EPREFIX}"/usr \
+		feature-libcap="$(usex caps 1 0)" \
+		"$@"
+}
+
+src_compile() {
+	bpftool_make
+	bpftool_make -C Documentation
+	rm Documentation/bpf-helpers* || die
+}
+
+src_install() {
+	bpftool_make DESTDIR="${D}" install
+	bpftool_make mandir="${ED}"/usr/share/man -C Documentation install
+
+	# bpf-helpers man is already provided by sys-apps/man-pages
+	rm -r "${ED}"/usr/share/man/man7 || die
+}
+
+pkg_postinst() {
+	optfeature "clang-bpf-co-re support" sys-devel/clang[llvm_targets_BPF]
+}
diff --git a/dev-util/bpftool/metadata.xml b/dev-util/bpftool/metadata.xml
new file mode 100644
index 000000000000..5e14e3b3c659
--- /dev/null
+++ b/dev-util/bpftool/metadata.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>jsmolic@gentoo.org</email>
+		<name>Jakov Smolić</name>
+	</maintainer>
+	<use>
+		<flag name="caps">Use <pkg>sys-libs/libcap</pkg> to enable unprivileged run support</flag>
+	</use>
+</pkgmetadata>