name : test_bpftool_build.sh #!/bin/bash # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) case $1 in -h|--help) echo -e "$0 [-j <n>]" echo -e "\tTest the different ways of building bpftool." echo -e "" echo -e "\tOptions:" echo -e "\t\t-j <n>:\tPass -j flag to 'make'." exit 0 ;; esac J=$* # Assume script is located under tools/testing/selftests/bpf/. We want to start # build attempts from the top of kernel repository. SCRIPT_REL_PATH=$(realpath --relative-to=$PWD $0) SCRIPT_REL_DIR=$(dirname $SCRIPT_REL_PATH) KDIR_ROOT_DIR=$(realpath $PWD/$SCRIPT_REL_DIR/../../../../) cd $KDIR_ROOT_DIR if [ ! -e tools/bpf/bpftool/Makefile ]; then echo -e "skip: bpftool files not found!\n" exit 4 # KSFT_SKIP=4 fi ERROR=0 TMPDIR= # If one build fails, continue but return non-0 on exit. return_value() { if [ -d "$TMPDIR" ] ; then rm -rf -- $TMPDIR fi exit $ERROR } trap return_value EXIT check() { local dir=$(realpath $1) echo -n "binary: " # Returns non-null if file is found (and "false" is run) find $dir -type f -executable -name bpftool -print -exec false {} + && \ ERROR=1 && printf "FAILURE: Did not find bpftool\n" } make_and_clean() { echo -e "\$PWD: $PWD" echo -e "command: make -s $* >/dev/null" make $J -s $* >/dev/null if [ $? -ne 0 ] ; then ERROR=1 fi if [ $# -ge 1 ] ; then check ${@: -1} else check . fi ( if [ $# -ge 1 ] ; then cd ${@: -1} fi make -s clean ) echo } make_with_tmpdir() { local ARGS TMPDIR=$(mktemp -d) if [ $# -ge 2 ] ; then ARGS=${@:1:(($# - 1))} fi echo -e "\$PWD: $PWD" echo -e "command: make -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null" make $J -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null if [ $? -ne 0 ] ; then ERROR=1 fi check $TMPDIR rm -rf -- $TMPDIR echo } echo "Trying to build bpftool" echo -e "... through kbuild\n" if [ -f ".config" ] ; then make_and_clean tools/bpf ## "make tools/bpf" sets $(OUTPUT) to ...tools/bpf/runqslower for ## runqslower, but the default (used for the "clean" target) is .output. ## Let's make sure we clean runqslower's directory properly. make -C tools/bpf/runqslower OUTPUT=${KDIR_ROOT_DIR}/tools/bpf/runqslower/ clean ## $OUTPUT is overwritten in kbuild Makefile, and thus cannot be passed ## down from toplevel Makefile to bpftool's Makefile. # make_with_tmpdir tools/bpf OUTPUT echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n" make_with_tmpdir tools/bpf O else echo -e "skip: make tools/bpf (no .config found)\n" echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n" echo -e "skip: make tools/bpf O=<dir> (no .config found)\n" fi echo -e "... from kernel source tree\n" make_and_clean -C tools/bpf/bpftool make_with_tmpdir -C tools/bpf/bpftool OUTPUT make_with_tmpdir -C tools/bpf/bpftool O echo -e "... from tools/\n" cd tools/ make_and_clean bpf ## In tools/bpf/Makefile, function "descend" is called and passes $(O) and ## $(OUTPUT). We would like $(OUTPUT) to have "bpf/bpftool/" appended before ## calling bpftool's Makefile, but this is not the case as the "descend" ## function focuses on $(O)/$(subdir). However, in the present case, updating ## $(O) to have $(OUTPUT) recomputed from it in bpftool's Makefile does not ## work, because $(O) is not defined from command line and $(OUTPUT) is not ## updated in tools/scripts/Makefile.include. ## ## Workarounds would require to a) edit "descend" or use an alternative way to ## call bpftool's Makefile, b) modify the conditions to update $(OUTPUT) and ## other variables in tools/scripts/Makefile.include (at the risk of breaking ## the build of other tools), or c) append manually the "bpf/bpftool" suffix to ## $(OUTPUT) in bpf's Makefile, which may break if targets for other directories ## use "descend" in the future. # make_with_tmpdir bpf OUTPUT echo -e "skip: make bpf OUTPUT=<dir> (not supported)\n" make_with_tmpdir bpf O echo -e "... from bpftool's dir\n" cd bpf/bpftool make_and_clean make_with_tmpdir OUTPUT make_with_tmpdir O