linux-kernel - Re: [PATCH bpf-next v4 2/3] selftests/bpf: Make install target copy test

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Date: Mon, 29 Jan 2024 16:59:17 -0800
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Mykola Lysenko <mykolal@...com>, bpf@...r.kernel.org, 
	netdev@...r.kernel.org, Björn Töpel <bjorn@...osinc.com>, 
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 2/3] selftests/bpf: Make install target copy
 test_progs extra files

On Sun, Jan 28, 2024 at 11:09 PM Björn Töpel <bjorn@...nel.org> wrote:
>
> From: Björn Töpel <bjorn@...osinc.com>
>
> Currently, "make install" does not install the required test_progs
> "extra files" (e.g. kernel modules, helper shell scripts, etc.) for
> the BPF machine flavors (e.g. cpuv4).
>
> Add the missing "extra files" dependencies to rsync, called from the
> install target.
>
> Unfortunately, kselftest does not use bash as the default shell, so
> the globbering is limited. Blindly enabling "SHELL:=/bin/bash" for the
> Makefile breaks in other places. Workaround by explicitly call
> "/bin/bash" to expand the file globbing.
>
> Signed-off-by: Björn Töpel <bjorn@...osinc.com>
> ---
>  tools/testing/selftests/bpf/Makefile | 29 +++++++++++++++++-----------
>  1 file changed, 18 insertions(+), 11 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 830a34f0aa37..c3c5b85f7dae 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -605,14 +605,15 @@ TRUNNER_EXTRA_SOURCES := test_progs.c             \
>                          json_writer.c          \
>                          flow_dissector_load.h  \
>                          ip_check_defrag_frags.h
> -TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko \
> -                      $(OUTPUT)/liburandom_read.so                     \
> -                      $(OUTPUT)/xdp_synproxy                           \
> -                      $(OUTPUT)/sign-file                              \
> -                      $(OUTPUT)/uprobe_multi                           \
> -                      ima_setup.sh                                     \
> -                      verify_sig_setup.sh                              \
> -                      $(wildcard progs/btf_dump_test_case_*.c)
> +TRUNNER_PROGS_EXTRA_FILES:= $(OUTPUT)/urandom_read $(OUTPUT)/bpf_testmod.ko    \
> +                           $(OUTPUT)/liburandom_read.so                        \
> +                           $(OUTPUT)/xdp_synproxy                              \
> +                           $(OUTPUT)/sign-file                                 \
> +                           $(OUTPUT)/uprobe_multi                              \
> +                           ima_setup.sh                                        \
> +                           verify_sig_setup.sh                                 \
> +                           $(wildcard progs/btf_dump_test_case_*.c)
> +TRUNNER_EXTRA_FILES := $(TRUNNER_PROGS_EXTRA_FILES)
>  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))
> @@ -740,11 +741,17 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR)    \
>  # Delete partially updated (corrupted) files on error
>  .DELETE_ON_ERROR:
>
> +space := $(subst ,, )
> +comma := ,
> +EXTRA_FILES_GLOB := {$(subst $(space),$(comma),$(notdir $(TRUNNER_PROGS_EXTRA_FILES)))}
>  DEFAULT_INSTALL_RULE := $(INSTALL_RULE)
>  override define INSTALL_RULE
>         $(DEFAULT_INSTALL_RULE)
> -       @for DIR in $(TEST_INST_SUBDIRS); do              \
> -               mkdir -p $(INSTALL_PATH)/$$DIR;   \
> -               rsync -a $(OUTPUT)/$$DIR/*.bpf.o $(INSTALL_PATH)/$$DIR;\
> +       @for DIR in $(TEST_INST_SUBDIRS); do                                            \
> +               mkdir -p $(INSTALL_PATH)/$$DIR;                                         \
> +               rsync -a $(OUTPUT)/$$DIR/*.bpf.o $(INSTALL_PATH)/$$DIR;                 \
> +               rsync -a --copy-unsafe-links                                            \
> +                       $$(/bin/bash -c "echo $(OUTPUT)/$$DIR/$(EXTRA_FILES_GLOB)")     \

this feels quite hacky... have you tried using $(foreach) to go over
each element of TRUNNER_PROGS_EXTRA_FILES and append $(OUTPUT)/$$DIR/
to each one? Hopefully that will allow us to get rid of space and
comma hacks?

I'm also wondering if it would be ok to just combine two rsync calls
into one, so that $(INSTALL_PATH)/$$DIR is specified once?


> +                       $(INSTALL_PATH)/$$DIR;                                          \
>         done
>  endef
> --
> 2.40.1
>