Re: [PATCH v8 2/4] perf test: Support external tests for separate objdir

[Namhyung Kim <namhyung@kernel.org>]

On Thu, Aug 01, 2024 at 02:28:42PM -0700, Andi Kleen wrote:
> Extend the searching for the test files so that it works
> when running perf from a separate objdir, and also when
> the perf executable is symlinked.
> 
> Signed-off-by: Andi Kleen <ak@linux.intel.com>
> 
> ----
> 
> v2: Fix string test (Namhyung)
> Handle both in source and out of source builds.
> ---
>  tools/perf/tests/tests-scripts.c | 37 +++++++++++++++++++++++++++++---
>  1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/tests/tests-scripts.c b/tools/perf/tests/tests-scripts.c
> index e2042b368269..9f71ffed702c 100644
> --- a/tools/perf/tests/tests-scripts.c
> +++ b/tools/perf/tests/tests-scripts.c
> @@ -29,16 +29,47 @@
>  
>  static int shell_tests__dir_fd(void)
>  {
> -	char path[PATH_MAX], *exec_path;
> -	static const char * const devel_dirs[] = { "./tools/perf/tests/shell", "./tests/shell", };
> +	struct stat st;
> +	char path[PATH_MAX], path2[PATH_MAX], *exec_path;
> +	static const char * const devel_dirs[] = {
> +		"./tools/perf/tests/shell",
> +		"./tests/shell",
> +		"./source/tests/shell"
> +	};
> +	int fd;
> +	char *p;
>  
>  	for (size_t i = 0; i < ARRAY_SIZE(devel_dirs); ++i) {
> -		int fd = open(devel_dirs[i], O_PATH);
> +		fd = open(devel_dirs[i], O_PATH);
>  
>  		if (fd >= 0)
>  			return fd;
>  	}
>  
> +	/* Use directory of executable */
> +	if (readlink("/proc/self/exe", path2, sizeof path2) < 0)
> +		return -1;
> +	/* Follow another level of symlink if there */
> +	if (lstat(path2, &st) == 0 && (st.st_mode & S_IFMT) == S_IFLNK) {
> +		scnprintf(path, sizeof(path), path2);
> +		if (readlink(path, path2, sizeof path2) < 0)
> +			return -1;
> +	}
> +	/* Get directory */
> +	p = strrchr(path2, '/');
> +	if (p)
> +		*p = 0;
> +	scnprintf(path, sizeof(path), "%s/tests/shell", path2);
> +	fd = open(path, O_PATH);
> +	if (fd >= 0)
> +		return fd;
> +	if (p)
> +		*p = 0;

This part looks unnecessary.

Thanks,
Namhyung


> +	scnprintf(path, sizeof(path), "%s/source/tests/shell", path2);
> +	fd = open(path, O_PATH);
> +	if (fd >= 0)
> +		return fd;
> +
>  	/* Then installed path. */
>  	exec_path = get_argv_exec_path();
>  	scnprintf(path, sizeof(path), "%s/tests/shell", exec_path);
> -- 
> 2.45.2
>