Merge branch 'veristat-files-list-txt-notation-for-object-files-list'

Eduard Zingerman says:

====================
veristat: @files-list.txt notation for object files list

A few small veristat improvements:
- It is possible to hit command line parameters number limit,
  e.g. when running veristat for all object files generated for
  test_progs. This patch-set adds an option to read objects files list
  from a file.
- Correct usage of strerror() function.
- Avoid printing log lines to CSV output.

Changelog:
- v1 -> v2:
  - replace strerror(errno) with strerror(-err) in patch #2 (Andrii)

v1: https://lore.kernel.org/bpf/[email protected]/T/
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Andrii Nakryiko <[email protected]>

Author: anakryiko

tools/testing/selftests/bpf/veristat.c

@@ -268,10 +268,11 @@ static int append_filter(struct filter **filters, int *cnt, const char *str);
 static int append_filter_file(const char *path);
 static int append_var_preset(struct var_preset **presets, int *cnt, const char *expr);
 static int append_var_preset_file(const char *filename);
+static int append_file(const char *path);
+static int append_file_from_file(const char *path);
 
 static error_t parse_arg(int key, char *arg, struct argp_state *state)
 {
-	void *tmp;
 	int err;
 
 	switch (key) {
@@ -381,14 +382,14 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 		break;
 	}
 	case ARGP_KEY_ARG:
-		tmp = realloc(env.filenames, (env.filename_cnt + 1) * sizeof(*env.filenames));
-		if (!tmp)
-			return -ENOMEM;
-		env.filenames = tmp;
-		env.filenames[env.filename_cnt] = strdup(arg);
-		if (!env.filenames[env.filename_cnt])
-			return -ENOMEM;
-		env.filename_cnt++;
+		if (arg[0] == '@')
+			err = append_file_from_file(arg + 1);
+		else
+			err = append_file(arg);
+		if (err) {
+			fprintf(stderr, "Failed to collect BPF object files: %d\n", err);
+			return err;
+		}
 		break;
 	default:
 		return ARGP_ERR_UNKNOWN;
@@ -659,7 +660,7 @@ static int append_filter_file(const char *path)
 	f = fopen(path, "r");
 	if (!f) {
 		err = -errno;
-		fprintf(stderr, "Failed to open filters in '%s': %s\n", path, strerror(err));
+		fprintf(stderr, "Failed to open filters in '%s': %s\n", path, strerror(-err));
 		return err;
 	}
 
@@ -689,6 +690,49 @@ static const struct stat_specs default_output_spec = {
 	},
 };
 
+static int append_file(const char *path)
+{
+	void *tmp;
+
+	tmp = realloc(env.filenames, (env.filename_cnt + 1) * sizeof(*env.filenames));
+	if (!tmp)
+		return -ENOMEM;
+	env.filenames = tmp;
+	env.filenames[env.filename_cnt] = strdup(path);
+	if (!env.filenames[env.filename_cnt])
+		return -ENOMEM;
+	env.filename_cnt++;
+	return 0;
+}
+
+static int append_file_from_file(const char *path)
+{
+	char buf[1024];
+	int err = 0;
+	FILE *f;
+
+	f = fopen(path, "r");
+	if (!f) {
+		err = -errno;
+		fprintf(stderr, "Failed to open object files list in '%s': %s\n",
+			path, strerror(errno));
+		return err;
+	}
+
+	while (fscanf(f, " %1023[^\n]\n", buf) == 1) {
+		/* lines starting with # are comments, skip them */
+		if (buf[0] == '\0' || buf[0] == '#')
+			continue;
+		err = append_file(buf);
+		if (err)
+			goto cleanup;
+	}
+
+cleanup:
+	fclose(f);
+	return err;
+}
+
 static const struct stat_specs default_csv_output_spec = {
 	.spec_cnt = 14,
 	.ids = {
@@ -1190,13 +1234,13 @@ static void fixup_obj(struct bpf_object *obj, struct bpf_program *prog, const ch
 			bpf_program__set_expected_attach_type(prog, attach_type);
 
 			if (!env.quiet) {
-				printf("Using guessed program type '%s' for %s/%s...\n",
+				fprintf(stderr, "Using guessed program type '%s' for %s/%s...\n",
 					libbpf_bpf_prog_type_str(prog_type),
 					filename, prog_name);
 			}
 		} else {
 			if (!env.quiet) {
-				printf("Failed to guess program type for freplace program with context type name '%s' for %s/%s. Consider using canonical type names to help veristat...\n",
+				fprintf(stderr, "Failed to guess program type for freplace program with context type name '%s' for %s/%s. Consider using canonical type names to help veristat...\n",
 					ctx_name, filename, prog_name);
 			}
 		}
@@ -1378,7 +1422,7 @@ static int append_var_preset_file(const char *filename)
 	f = fopen(filename, "rt");
 	if (!f) {
 		err = -errno;
-		fprintf(stderr, "Failed to open presets in '%s': %s\n", filename, strerror(err));
+		fprintf(stderr, "Failed to open presets in '%s': %s\n", filename, strerror(-err));
 		return -EINVAL;
 	}