netdev - Re: [PATCH net 1/2] selftests/bpf: Fix build error with ima

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Date:   Fri, 13 May 2022 14:58:05 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Hangbin Liu <liuhangbin@...il.com>
Cc:     Networking <netdev@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH net 1/2] selftests/bpf: Fix build error with ima_setup.sh

On Thu, May 12, 2022 at 12:18 AM Hangbin Liu <liuhangbin@...il.com> wrote:
>
> KP fixed ima_setup.sh missing issue when build test_progs separately with
> commit 854055c0cf30 ("selftests/bpf: Fix flavored variants of
> test_ima"). But the fix is incorrect because the build will failed with
> error:
>
>   $ OUTPUT="/tmp/bpf" make test_progs
>     [...]
>   make: *** No rule to make target '/tmp/bpf/ima_setup.sh', needed by 'ima_setup.sh'.  Stop.
>
> Fix it by adding a new variable TRUNNER_EXTRA_BUILD to build extra binaries.
> Left TRUNNER_EXTRA_FILES only for copying files
>
> Fixes: 854055c0cf30 ("selftests/bpf: Fix flavored variants of test_ima")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  tools/testing/selftests/bpf/Makefile | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 3820608faf57..5944d3a8fff6 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -466,10 +466,10 @@ $(TRUNNER_EXTRA_OBJS): $(TRUNNER_OUTPUT)/%.o:                             \
>
>  # non-flavored in-srctree builds receive special treatment, in particular, we
>  # do not need to copy extra resources (see e.g. test_btf_dump_case())
> -$(TRUNNER_BINARY)-extras: $(TRUNNER_EXTRA_FILES) | $(TRUNNER_OUTPUT)
> +$(TRUNNER_BINARY)-extras: $(TRUNNER_EXTRA_BUILD) | $(TRUNNER_OUTPUT)
>  ifneq ($2:$(OUTPUT),:$(shell pwd))
>         $$(call msg,EXT-COPY,$(TRUNNER_BINARY),$(TRUNNER_EXTRA_FILES))
> -       $(Q)rsync -aq $$^ $(TRUNNER_OUTPUT)/
> +       $(Q)rsync -aq $(TRUNNER_EXTRA_FILES) $(TRUNNER_OUTPUT)/
>  endif
>
>  $(OUTPUT)/$(TRUNNER_BINARY): $(TRUNNER_TEST_OBJS)                      \
> @@ -490,9 +490,9 @@ TRUNNER_EXTRA_SOURCES := test_progs.c cgroup_helpers.c trace_helpers.c      \
>                          network_helpers.c testing_helpers.c            \
>                          btf_helpers.c flow_dissector_load.h            \
>                          cap_helpers.c
> -TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
> -                      ima_setup.sh                                     \
> +TRUNNER_EXTRA_BUILD := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
>                        $(wildcard progs/btf_dump_test_case_*.c)


note that progs/btf_dump_test_case_*.c are not built, they are just
copied over (C source files), so I don't think this fix is necessary.

btw, I tried running `OUTPUT="/tmp/bpf" make test_progs` and it didn't
error out. But tbh, I'd recommend building everything instead of
building individual targets.


> +TRUNNER_EXTRA_FILES := $(TRUNNER_EXTRA_BUILD) ima_setup.sh
>  TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
>  TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(CLANG_CFLAGS) -DENABLE_ATOMICS_TESTS
>  $(eval $(call DEFINE_TEST_RUNNER,test_progs))
> @@ -513,6 +513,7 @@ endif
>  TRUNNER_TESTS_DIR := map_tests
>  TRUNNER_BPF_PROGS_DIR := progs
>  TRUNNER_EXTRA_SOURCES := test_maps.c
> +TRUNNER_EXTRA_BUILD :=
>  TRUNNER_EXTRA_FILES :=
>  TRUNNER_BPF_BUILD_RULE := $$(error no BPF objects should be built)
>  TRUNNER_BPF_CFLAGS :=
> --
> 2.35.1
>