# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Distributed under the terms of the GNU General Public License v2

EAPI=7
inherit ninja-utils toolchain-funcs user

DESCRIPTION="An open-source project for performance instrumentation and tracing."
HOMEPAGE="https://perfetto.dev/"

GIT_SHA1="53d3c085a784d64808cf67a32cac80182ecd87ef"
SRC_URI="https://github.com/google/perfetto/archive/${GIT_SHA1}.tar.gz -> ${P}.tar.gz"

KEYWORDS="*"
IUSE="cros-debug"
LICENSE="Apache-2.0"
SLOT="0"

# protobuf dep is for using protoc at build-time to generate perfetto's headers.
BDEPEND="
	dev-util/gn
	dev-util/ninja
	dev-libs/protobuf
"
BUILD_OUTPUT="${WORKDIR}/out_cros/"

S="${WORKDIR}/${PN}-${GIT_SHA1}"

src_configure() {
	tc-export CC CXX AR BUILD_CC BUILD_CXX BUILD_AR
	local target_cpu="${ARCH}"
	# Make the "amd64" -> "x64" conversion for the GN arg |target_cpu|.
	if [[ "${target_cpu}" == "amd64" ]]; then
		target_cpu="x64"
	fi

	# Don't turn on is_debug in building the system tracing service daemon.
	# Running a debug build traced with a release build producer will likely
	# cause crashes.
	local is_debug="false"

	local warn_flags=(
		"-Wno-suggest-destructor-override"
		"-Wno-suggest-override"
	)
	# Specify the linker to be used, this will be invoked by
	# perfetto build as link argument "-fuse-ld=<>" so it needs to be
	# the linker name bfd/gold/lld etc. that clang/gcc understand.
	local linker_name="bfd"
	tc-ld-is-gold && linker_name="gold"
	tc-ld-is-lld && linker_name="lld"

	# Cross-compilation args.
	GN_ARGS="
is_system_compiler=true
ar=\"${BUILD_AR}\"
cc=\"${BUILD_CC}\"
cxx=\"${BUILD_CXX}\"
linker=\"${linker_name}\"
target_ar=\"${AR}\"
target_cc=\"${CC}\"
target_cxx=\"${CXX}\"
target_linker=\"${linker_name}\"
target_cpu=\"${target_cpu}\"
target_triplet=\"${CHOST}\"
extra_target_cflags=\"${CFLAGS} ${warn_flags[*]}\"
extra_target_cxxflags=\"${CXXFLAGS} ${warn_flags[*]}\"
extra_target_ldflags=\"${LDFLAGS}\"
"

	# Extra args to make the targets build.
	GN_ARGS+="
is_debug=${is_debug}
enable_perfetto_stderr_crash_dump=false
enable_perfetto_trace_processor_json=false
monolithic_binaries=true
use_custom_libcxx=false
is_hermetic_clang=false
enable_perfetto_zlib=false
skip_buildtools_check=true
perfetto_use_system_protobuf=true
enable_perfetto_version_gen=false
"
	einfo "GN_ARGS = ${GN_ARGS}"
	gn gen "${BUILD_OUTPUT}" --args="${GN_ARGS}" || die
}

src_compile() {
	eninja -C  "${BUILD_OUTPUT}" traced traced_probes perfetto
}

src_install() {
	dobin "${BUILD_OUTPUT}/traced"
	dobin "${BUILD_OUTPUT}/traced_probes"
	dobin "${BUILD_OUTPUT}/perfetto"

	insinto /etc/init
	doins "${FILESDIR}/init/traced.conf"
	doins "${FILESDIR}/init/traced_probes.conf"

	insinto /usr/share/policy
	newins "${FILESDIR}/seccomp/traced-${ARCH}.policy" traced.policy
	newins "${FILESDIR}/seccomp/traced_probes-${ARCH}.policy" traced_probes.policy
}

pkg_preinst() {
	enewuser "traced"
	enewgroup "traced"
	enewuser "traced-probes"
	enewgroup "traced-probes"
	enewgroup "traced-producer"
	enewgroup "traced-consumer"
}