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selftests/bpf: Check BPFTOOL env var in detect_bpftool_path()

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The bpftool_maps_access and bpftool_metadata tests may fail on BPF CI
with "command not found", depending on a workflow.
This happens because detect_bpftool_path() only checks two hardcoded
relative paths:
  - ./tools/sbin/bpftool
  - ../tools/sbin/bpftool

Add support for a BPFTOOL environment variable that allows specifying
the exact path to the bpftool binary.

Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Link: https://lore.kernel.org/r/20260223191118.655185-2-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ihor Solodrai 2026-02-23 11:11:17 -08:00 committed by Alexei Starovoitov
parent ad90ecedad
commit a2714e7303
1 changed files with 12 additions and 1 deletions
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13
tools/testing/selftests/bpf/bpftool_helpers.c
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@ -14,6 +14,17 @@
static int detect_bpftool_path(char *buffer, size_t size)
{
char tmp[BPFTOOL_PATH_MAX_LEN];
const char *env_path;
/* First, check if BPFTOOL environment variable is set */
env_path = getenv("BPFTOOL");
if (env_path && access(env_path, X_OK) == 0) {
strscpy(buffer, env_path, size);
return 0;
} else if (env_path) {
fprintf(stderr, "bpftool '%s' doesn't exist or is not executable\n", env_path);
return 1;
}
/* Check default bpftool location (will work if we are running the
* default flavor of test_progs)
@ -33,7 +44,7 @@ static int detect_bpftool_path(char *buffer, size_t size)
return 0;
}
/* Failed to find bpftool binary */
fprintf(stderr, "Failed to detect bpftool path, use BPFTOOL env var to override\n");
return 1;
}