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selftests/bpf: Add a few helpers for bpftool testing

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In order to integrate some bpftool tests into test_progs, define a few
specific helpers that allow to execute bpftool commands, while possibly
retrieving the command output. Those helpers most notably set the
path to the bpftool binary under test. This version checks different
possible paths relative to the directories where the different
test_progs runners are executed, as we want to make sure not to
accidentally use a bootstrap version of the binary.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20260123-bpftool-tests-v4-1-a6653a7f28e7@bootlin.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2026-01-23 09:30:08 +01:00
committed by Alexei Starovoitov
parent 78980b4c7f
commit f21fae5774
3 changed files with 87 additions and 1 deletions
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3
tools/testing/selftests/bpf/Makefile
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@@ -747,7 +747,8 @@ TRUNNER_EXTRA_SOURCES := test_progs.c \
json_writer.c \
$(VERIFY_SIG_HDR) \
flow_dissector_load.h \
ip_check_defrag_frags.h
ip_check_defrag_frags.h \
bpftool_helpers.c
TRUNNER_LIB_SOURCES := find_bit.c
TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read \
$(OUTPUT)/liburandom_read.so \