On Fri, Aug 21, 2020 at 8:09 AM Jesper Dangaard Brouer
<brouer@xxxxxxxxxx> wrote:
>
> Commit 643e7233aa94 ("selftests/bpf: Test_progs option for getting number of
> tests") introduced ability to getting number of tests, which is targeted
> towards scripting. As demonstrate in the commit the number can be use as a
> shell variable for further scripting.
>
> The test_progs program support "flavor", which is detected by the binary
> have a "-flavor" in the executable name. One example is test_progs-no_alu32,
> which load bpf-progs compiled with disabled alu32, located in dir 'no_alu32/'.
>
> The problem is that invoking a "flavor" binary prints to stdout e.g.:
> "Switching to flavor 'no_alu32' subdirectory..."
> Thus, intermixing with the number of tests, making it unusable for scripting.
>
> Fix the issue by printing "flavor" info to stderr instead of stdout.
>
> Fixes: 643e7233aa94 ("selftests/bpf: Test_progs option for getting number of tests")
> Signed-off-by: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>
> ---
Acked-by: Andrii Nakryiko <andriin@xxxxxx>
> tools/testing/selftests/bpf/test_progs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> index b1e4dadacd9b..d858e883bd75 100644
> --- a/tools/testing/selftests/bpf/test_progs.c
> +++ b/tools/testing/selftests/bpf/test_progs.c
> @@ -618,7 +618,7 @@ int cd_flavor_subdir(const char *exec_name)
> if (!flavor)
> return 0;
> flavor++;
> - fprintf(stdout, "Switching to flavor '%s' subdirectory...\n", flavor);
> + fprintf(stderr, "Switching to flavor '%s' subdirectory...\n", flavor);
> return chdir(flavor);
> }
>
>
>
