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# Copyright 2024 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
inherit edo flag-o-matic linux-info systemd toolchain-funcs udev
DESCRIPTION="Dynamic BPF-based system-wide tracing tool"
HOMEPAGE="https://github.com/oracle/dtrace-utils https://wiki.gentoo.org/wiki/DTrace"
if [[ ${PV} == 9999 ]]; then
EGIT_BRANCH="devel"
EGIT_REPO_URI="https://github.com/oracle/dtrace-utils"
inherit git-r3
else
SRC_URI="https://github.com/oracle/dtrace-utils/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz"
S="${WORKDIR}"/dtrace-utils-${PV}
KEYWORDS="-* ~amd64"
fi
LICENSE="UPL-1.0"
SLOT="0"
IUSE="systemd install-tests"
# XXX: right now, we auto-adapt to whether multilibs are present:
# should we force them to be? how?
#
# XXX: binutils-libs will need an extra patch for what dtrace does with
# it in the absence of in-kernel CTF: it will be backported
# to 2.42, but perhaps a patch would be a good idea before that?
DEPEND="
dev-libs/elfutils
dev-libs/libbpf
dev-libs/libpfm:=
net-analyzer/wireshark[dumpcap]
net-libs/libpcap
>=sys-fs/fuse-3.2.0:3
>=sys-libs/binutils-libs-2.42:=
sys-libs/zlib
systemd? ( sys-apps/systemd )
"
RDEPEND="
${DEPEND}
!dev-debug/systemtap
net-analyzer/wireshark
install-tests? (
app-alternatives/bc
app-editors/vim-core
dev-build/make
dev-lang/perl
dev-util/perf
net-fs/nfs-utils
sys-apps/coreutils
sys-fs/xfsprogs
sys-process/time
virtual/jdk
virtual/perl-IO-Socket-IP
)
"
BDEPEND="
dev-build/make
sys-apps/gawk
sys-devel/bison
>=sys-devel/bpf-toolchain-14.1.0
sys-devel/flex
"
# TODO: Make this optional, valgrind.h is included unconditionally
# https://github.com/oracle/dtrace-utils/issues/80
DEPEND+=" dev-debug/valgrind"
QA_PRESTRIPPED="
usr/.*/dtrace/testsuite/test/triggers/.*
"
QA_FLAGS_IGNORED="
usr/.*/dtrace/testsuite/test/triggers/.*
"
pkg_pretend() {
# TODO: optional kernel patches
# Basics for debugging information, BPF
local CONFIG_CHECK="~BPF ~DEBUG_INFO_BTF ~KALLSYMS_ALL"
CONFIG_CHECK+=" ~CUSE"
# Tracing
CONFIG_CHECK+=" ~TRACING"
CONFIG_CHECK+=" ~UPROBES ~UPROBE_EVENTS"
CONFIG_CHECK+=" ~FTRACE ~FTRACE_SYSCALLS ~DYNAMIC_FTRACE ~FUNCTION_TRACER"
CONFIG_CHECK+=" ~FPROBE"
# DTrace can fallback to kprobes for fbt but people often want them off
# for security and newer kernels work fine with BPF for that, so
# let's omit it. kprobes are slower and scale poorly.
# https://gcc.gnu.org/PR84052
CONFIG_CHECK+=" !GCC_PLUGIN_RANDSTRUCT"
if use install-tests ; then
# See test/modules
CONFIG_CHECK+=" ~EXT4_FS ~ISO9660_FS ~NFS_FS ~RDS ~TUN"
fi
check_extra_config
}
pkg_setup() {
eval unset ${!LC_*} LANG
}
src_configure() {
if tc-is-cross-compiler; then
die "DTrace does not yet support cross-compilation."
fi
tc-export CC
# https://github.com/oracle/dtrace-utils/issues/78
tc-enables-fortify-source && append-cppflags -U_FORTIFY_SOURCE
# lld does this by default, so fix that, although lld fails anyway...
# 'LIBDTRACE_1.0' to symbol 'dtrace_provider_modules' failed: symbol not defined
append-ldflags $(test-flags-CCLD -Wl,--undefined-version)
# mold and lld can't cope with some relocation types used, e.g.
# 'test-triggers--usdt-tst-forker-prov.o:(.SUNW_dof): unknown relocation: R_X86_64_GLOB_DAT'
tc-ld-force-bfd
# -fno-semantic-interposition seems to lead to a broken dtrace
# that can't actually obtain results from probes, even trivial examples
# just hang.
filter-flags -fno-semantic-interposition
filter-lto
local confargs=(
# TODO: Maybe we should set the UNPRIV_UID to something? -3 is a bit... kludgy
--prefix="${EPREFIX}"/usr
--mandir="${EPREFIX}"/usr/share/man/man8
--docdir="${EPREFIX}"/usr/share/doc/${PF}
HAVE_LIBCTF=yes
HAVE_LIBSYSTEMD=$(usex systemd)
HAVE_BPFV3=yes
)
edo ./configure "${confargs[@]}"
}
src_compile() {
emake verbose=1 $(usev !install-tests TRIGGERS='')
}
src_test() {
# Needs root and is also very time-consuming
:;
}
src_install() {
emake DESTDIR="${D}" install $(usev install-tests install-test)
# Stripping the BPF libs breaks them
dostrip -x "/usr/$(get_libdir)"
# It's a binary (TODO: move it?)
docompress -x /usr/share/doc/${PF}/showUSDT
newinitd "${FILESDIR}"/dtprobed.init dtprobed
}
pkg_postinst() {
# We need a udev reload to pick up the CUSE device node rules.
udev_reload
# TODO: Restart it on upgrade? (it will carry across its own persistent state)
if [[ -n ${REPLACING_VERSIONS} ]]; then
# TODO: Make this more intelligent wrt comparison
if systemd_is_booted ; then
einfo "Restart the DTrace 'dtprobed' service after upgrades:"
einfo " systemctl try-restart dtprobed"
else
einfo "Restart the DTrace 'dtprobed' service with:"
einfo " /etc/init.d/dtprobed restart"
fi
else
einfo "See https://wiki.gentoo.org/wiki/DTrace for getting started."
if systemd_is_booted ; then
einfo "Enable and start the DTrace 'dtprobed' service with:"
einfo " systemctl enable --now dtprobed"
else
einfo "Enable and start the DTrace 'dtprobed' service with:"
einfo " rc-update add dtprobed"
einfo " /etc/init.d/dtprobed start"
fi
fi
}
pkg_postrm() {
udev_reload
}
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