# Copyright 1999-2023 Gentoo Authors # Distributed under the terms of the GNU General Public License v2 # @ECLASS: bazel.eclass # @MAINTAINER: # Jason Zaman <perfinion@gentoo.org> # @AUTHOR: # Jason Zaman <perfinion@gentoo.org> # @SUPPORTED_EAPIS: 8 # @BLURB: Utility functions for packages using Bazel Build # @DESCRIPTION: # A utility eclass providing functions to run the Bazel Build system. # # This eclass does not export any phase functions. case ${EAPI} in 8) ;; *) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;; esac if [[ ! ${_BAZEL_ECLASS} ]]; then _BAZEL_ECLASS=1 inherit multiprocessing toolchain-funcs if [[ ${CATEGORY}/${PN} != "dev-util/bazel" ]]; then BDEPEND=">=dev-util/bazel-0.20" fi # @ECLASS_VARIABLE: BAZEL_BINARY # @DESCRIPTION: # The program to invoke for bazel. Defaults to `bazel`. Useful if you have # multiple bazel installations on your machine that differ in verson suffix, # e.g., `bazel-5`, `bazel-6`. BAZEL_BINARY="${BAZEL_BINARY:-bazel}" # @FUNCTION: bazel_get_flags # @DESCRIPTION: # Obtain and print the bazel flags for target and host *FLAGS. # # To add more flags to this, append the flags to the # appropriate variable before calling this function bazel_get_flags() { local i fs=() for i in ${CFLAGS}; do fs+=( "--conlyopt=${i}" ) done for i in ${BUILD_CFLAGS}; do fs+=( "--host_conlyopt=${i}" ) done for i in ${CXXFLAGS}; do fs+=( "--cxxopt=${i}" ) done for i in ${BUILD_CXXFLAGS}; do fs+=( "--host_cxxopt=${i}" ) done for i in ${CPPFLAGS}; do fs+=( "--conlyopt=${i}" "--cxxopt=${i}" ) done for i in ${BUILD_CPPFLAGS}; do fs+=( "--host_conlyopt=${i}" "--host_cxxopt=${i}" ) done for i in ${LDFLAGS}; do fs+=( "--linkopt=${i}" ) done for i in ${BUILD_LDFLAGS}; do fs+=( "--host_linkopt=${i}" ) done echo "${fs[*]}" } # @FUNCTION: bazel_setup_bazelrc # @DESCRIPTION: # Creates the bazelrc with common options that will be passed # to bazel. This will be called by ebazel automatically so # does not need to be called from the ebuild. bazel_setup_bazelrc() { if [[ -f "${T}/bazelrc" ]]; then return fi # F: fopen_wr # P: /proc/self/setgroups # Even with standalone enabled, the Bazel sandbox binary is run for feature test: # https://github.com/bazelbuild/bazel/blob/7b091c1397a82258e26ab5336df6c8dae1d97384/src/main/java/com/google/devtools/build/lib/sandbox/LinuxSandboxedSpawnRunner.java#L61 # https://github.com/bazelbuild/bazel/blob/76555482873ffcf1d32fb40106f89231b37f850a/src/main/tools/linux-sandbox-pid1.cc#L113 addpredict /proc mkdir -p "${T}/bazel-cache" || die mkdir -p "${T}/bazel-distdir" || die cat > "${T}/bazelrc" <<-EOF || die startup --batch # dont strip HOME, portage sets a temp per-package dir build --action_env HOME # make bazel respect MAKEOPTS build --jobs=$(makeopts_jobs) build --compilation_mode=opt --host_compilation_mode=opt # FLAGS build $(bazel_get_flags) # Use standalone strategy to deactivate the bazel sandbox, since it # conflicts with FEATURES=sandbox. build --spawn_strategy=standalone --genrule_strategy=standalone test --spawn_strategy=standalone --genrule_strategy=standalone build --strip=never build --verbose_failures --noshow_loading_progress test --verbose_test_summary --verbose_failures --noshow_loading_progress # make bazel only fetch distfiles from the cache fetch --repository_cache="${T}/bazel-cache/" --distdir="${T}/bazel-distdir/" build --repository_cache="${T}/bazel-cache/" --distdir="${T}/bazel-distdir/" build --define=PREFIX=${EPREFIX}/usr build --define=LIBDIR=\$(PREFIX)/$(get_libdir) build --define=INCLUDEDIR=\$(PREFIX)/include EOF if tc-is-cross-compiler; then echo "build --distinct_host_configuration" >> "${T}/bazelrc" || die else echo "build --nodistinct_host_configuration" >> "${T}/bazelrc" || die fi } # @FUNCTION: ebazel # @USAGE: [<args>...] # @DESCRIPTION: # Run bazel with the bazelrc and output_base. # # output_base will be specific to $BUILD_DIR (if unset, $S). # bazel_setup_bazelrc will be called and the created bazelrc # will be passed to bazel. # # Will automatically die if bazel does not exit cleanly. ebazel() { bazel_setup_bazelrc # Use different build folders for each multibuild variant. local output_base="${BUILD_DIR:-${S}}" output_base="${output_base%/}-bazel-base" mkdir -p "${output_base}" || die set -- "${BAZEL_BINARY}" --bazelrc="${T}/bazelrc" --output_base="${output_base}" ${@} echo "${*}" >&2 "${@}" || die "ebazel failed" } # @FUNCTION: bazel_load_distfiles # @USAGE: <distfiles>... # @DESCRIPTION: # Populate the bazel distdir to fetch from since it cannot use # the network. Bazel looks in distdir but will only look for the # original filename, not the possibly renamed one that portage # downloaded. If the line has -> we to rename it back. This also # handles use-conditionals that SRC_URI does. # # Example: # @CODE # bazel_external_uris="http://a/file-2.0.tgz # python? ( http://b/1.0.tgz -> foo-1.0.tgz )" # SRC_URI="http://c/${PV}.tgz # ${bazel_external_uris}" # # src_unpack() { # unpack ${PV}.tgz # bazel_load_distfiles "${bazel_external_uris}" # } # @CODE bazel_load_distfiles() { local file="" local rename=0 [[ "${@}" ]] || die "Missing args" mkdir -p "${T}/bazel-distdir" || die for word in ${@} do if [[ "${word}" == "->" ]]; then # next word is a dest filename rename=1 elif [[ "${word}" == ")" ]]; then # close conditional block continue elif [[ "${word}" == "(" ]]; then # open conditional block continue elif [[ "${word}" == ?(\!)[A-Za-z0-9]*([A-Za-z0-9+_@-])\? ]]; then # use-conditional block # USE-flags can contain [A-Za-z0-9+_@-], and start with alphanum # https://dev.gentoo.org/~ulm/pms/head/pms.html#x1-200003.1.4 # ?(\!) matches zero-or-one !'s # *(...) zero-or-more characters # ends with a ? continue elif [[ ${rename} -eq 1 ]]; then # Make sure the distfile is used if [[ "${A}" == *"${word}"* ]]; then echo "Copying ${word} to bazel distdir as ${file}" ln -s "${DISTDIR}/${word}" "${T}/bazel-distdir/${file}" || die fi rename=0 file="" else # another URL, current one may or may not be a rename # if there was a previous one, its not renamed so copy it now if [[ -n "${file}" && "${A}" == *"${file}"* ]]; then echo "Copying ${file} to bazel distdir" ln -s "${DISTDIR}/${file}" "${T}/bazel-distdir/${file}" || die fi # save the current URL, later we will find out if its a rename or not. file="${word##*/}" fi done # handle last file if [[ -n "${file}" ]]; then echo "Copying ${file} to bazel distdir" ln -s "${DISTDIR}/${file}" "${T}/bazel-distdir/${file}" || die fi } fi