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 $KDIR_ROOT_DIR
23 if [ ! -e tools/bpf/bpftool/Makefile ]; then
24 echo -e "skip: bpftool files not found!\n"
25 exit 4 # KSFT_SKIP=4
26 fi
27
28 ERROR=0
29 TMPDIR=
30
31 # If one build fails, continue but return non-0 on exit.
32 return_value() {
33 if [ -d "$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 ## "make tools/bpf" sets $(OUTPUT) to ...tools/bpf/runqslower for
94 ## runqslower, but the default (used for the "clean" target) is .output.
95 ## Let's make sure we clean runqslower's directory properly.
96 make -C tools/bpf/runqslower OUTPUT=${KDIR_ROOT_DIR}/tools/bpf/runqslower/ clean
97
98 ## $OUTPUT is overwritten in kbuild Makefile, and thus cannot be passed
99 ## down from toplevel Makefile to bpftool's Makefile.
100
101 # make_with_tmpdir tools/bpf OUTPUT
102 echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n"
103
104 make_with_tmpdir tools/bpf O
105 else
106 echo -e "skip: make tools/bpf (no .config found)\n"
107 echo -e "skip: make tools/bpf OUTPUT=<dir> (not supported)\n"
108 echo -e "skip: make tools/bpf O=<dir> (no .config found)\n"
109 fi
110
111 echo -e "... from kernel source tree\n"
112
113 make_and_clean -C tools/bpf/bpftool
114
115 make_with_tmpdir -C tools/bpf/bpftool OUTPUT
116
117 make_with_tmpdir -C tools/bpf/bpftool O
118
119 echo -e "... from tools/\n"
120 cd tools/
121
122 make_and_clean bpf
123
124 ## In tools/bpf/Makefile, function "descend" is called and passes $(O) and
125 ## $(OUTPUT). We would like $(OUTPUT) to have "bpf/bpftool/" appended before
126 ## calling bpftool's Makefile, but this is not the case as the "descend"
127 ## function focuses on $(O)/$(subdir). However, in the present case, updating
128 ## $(O) to have $(OUTPUT) recomputed from it in bpftool's Makefile does not
129 ## work, because $(O) is not defined from command line and $(OUTPUT) is not
130 ## updated in tools/scripts/Makefile.include.
131 ##
132 ## Workarounds would require to a) edit "descend" or use an alternative way to
133 ## call bpftool's Makefile, b) modify the conditions to update $(OUTPUT) and
134 ## other variables in tools/scripts/Makefile.include (at the risk of breaking
135 ## the build of other tools), or c) append manually the "bpf/bpftool" suffix to
136 ## $(OUTPUT) in bpf's Makefile, which may break if targets for other directories
137 ## use "descend" in the future.
138
139 # make_with_tmpdir bpf OUTPUT
140 echo -e "skip: make bpf OUTPUT=<dir> (not supported)\n"
141
142 make_with_tmpdir bpf O
143
144 echo -e "... from bpftool's dir\n"
145 cd bpf/bpftool
146
147 make_and_clean
148
149 make_with_tmpdir OUTPUT
150
151 make_with_tmpdir O
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.