tools/testing/selftests/bpf/test_bpftool_build.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   3
   4 case $1 in
   5         -h|--help)
   6                 echo -e "$0 [-j <n>]"
   7                 echo -e "\tTest the different ways of building bpftool."
   8                 echo -e ""
   9                 echo -e "\tOptions:"
  10                 echo -e "\t\t-j <n>:\tPass -j flag to 'make'."
  11                 exit 0
  12                 ;;
  13 esac
  14
  15 J=$*
  16
  17 # Assume script is located under tools/testing/selftests/bpf/. We want to start
  18 # build attempts from the top of kernel repository.
  19 SCRIPT_REL_PATH=$(realpath --relative-to=$PWD $0)
  20 SCRIPT_REL_DIR=$(dirname $SCRIPT_REL_PATH)
  21 KDIR_ROOT_DIR=$(realpath $PWD/$SCRIPT_REL_DIR/../../../../)
  22 cd $KDIR_ROOT_DIR
  23 if [ ! -e tools/bpf/bpftool/Makefile ]; then
  24         echo -e "skip:    bpftool files not found!\n"
  25         exit 0
  26 fi
  27
  28 ERROR=0
  29 TMPDIR=
  30
  31 # If one build fails, continue but return non-0 on exit.
  32 return_value() {
  33         if [ -d "$TMPDIR" ] ; then
  34                 rm -rf -- $TMPDIR
  35         fi
  36         exit $ERROR
  37 }
  38 trap return_value EXIT
  39
  40 check() {
  41         local dir=$(realpath $1)
  42
  43         echo -n "binary:  "
  44         # Returns non-null if file is found (and "false" is run)
  45         find $dir -type f -executable -name bpftool -print -exec false {} + && \
  46                 ERROR=1 && printf "FAILURE: Did not find bpftool\n"
  47 }
  48
  49 make_and_clean() {
  50         echo -e "\$PWD:    $PWD"
  51         echo -e "command: make -s $* >/dev/null"
  52         make $J -s $* >/dev/null
  53         if [ $? -ne 0 ] ; then
  54                 ERROR=1
  55         fi
  56         if [ $# -ge 1 ] ; then
  57                 check ${@: -1}
  58         else
  59                 check .
  60         fi
  61         (
  62                 if [ $# -ge 1 ] ; then
  63                         cd ${@: -1}
  64                 fi
  65                 make -s clean
  66         )
  67         echo
  68 }
  69
  70 make_with_tmpdir() {
  71         local ARGS
  72
  73         TMPDIR=$(mktemp -d)
  74         if [ $# -ge 2 ] ; then
  75                 ARGS=${@:1:(($# - 1))}
  76         fi
  77         echo -e "\$PWD:    $PWD"
  78         echo -e "command: make -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null"
  79         make $J -s $ARGS ${@: -1}=$TMPDIR/ >/dev/null
  80         if [ $? -ne 0 ] ; then
  81                 ERROR=1
  82         fi
  83         check $TMPDIR
  84         rm -rf -- $TMPDIR
  85         echo
  86 }
  87
  88 echo "Trying to build bpftool"
  89 echo -e "... through kbuild\n"
  90
  91 if [ -f ".config" ] ; then
  92         make_and_clean tools/bpf
  93
  94         ## $OUTPUT is overwritten in kbuild Makefile, and thus cannot be passed
  95         ## down from toplevel Makefile to bpftool's Makefile.
  96
  97         # make_with_tmpdir tools/bpf OUTPUT
  98         echo -e "skip:    make tools/bpf OUTPUT=<dir> (not supported)\n"
  99
 100         make_with_tmpdir tools/bpf O
 101 else
 102         echo -e "skip:    make tools/bpf (no .config found)\n"
 103         echo -e "skip:    make tools/bpf OUTPUT=<dir> (not supported)\n"
 104         echo -e "skip:    make tools/bpf O=<dir> (no .config found)\n"
 105 fi
 106
 107 echo -e "... from kernel source tree\n"
 108
 109 make_and_clean -C tools/bpf/bpftool
 110
 111 make_with_tmpdir -C tools/bpf/bpftool OUTPUT
 112
 113 make_with_tmpdir -C tools/bpf/bpftool O
 114
 115 echo -e "... from tools/\n"
 116 cd tools/
 117
 118 make_and_clean bpf
 119
 120 ## In tools/bpf/Makefile, function "descend" is called and passes $(O) and
 121 ## $(OUTPUT). We would like $(OUTPUT) to have "bpf/bpftool/" appended before
 122 ## calling bpftool's Makefile, but this is not the case as the "descend"
 123 ## function focuses on $(O)/$(subdir). However, in the present case, updating
 124 ## $(O) to have $(OUTPUT) recomputed from it in bpftool's Makefile does not
 125 ## work, because $(O) is not defined from command line and $(OUTPUT) is not
 126 ## updated in tools/scripts/Makefile.include.
 127 ##
 128 ## Workarounds would require to a) edit "descend" or use an alternative way to
 129 ## call bpftool's Makefile, b) modify the conditions to update $(OUTPUT) and
 130 ## other variables in tools/scripts/Makefile.include (at the risk of breaking
 131 ## the build of other tools), or c) append manually the "bpf/bpftool" suffix to
 132 ## $(OUTPUT) in bpf's Makefile, which may break if targets for other directories
 133 ## use "descend" in the future.
 134
 135 # make_with_tmpdir bpf OUTPUT
 136 echo -e "skip:    make bpf OUTPUT=<dir> (not supported)\n"
 137
 138 make_with_tmpdir bpf O
 139
 140 echo -e "... from bpftool's dir\n"
 141 cd bpf/bpftool
 142
 143 make_and_clean
 144
 145 make_with_tmpdir OUTPUT
 146
 147 make_with_tmpdir O