tst_test.c: Add tst_cmd_present check if a command is present

Link: https://lore.kernel.org/ltp/20260109061716.20258-3-wegao@suse.com/
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Wei Gao <wegao@suse.com>

Author: coolgw

include/tst_test.h

@@ -726,6 +726,18 @@ int tst_creat_unlinked(const char *path, int flags, mode_t mode);
  */
 const char *tst_get_tmpdir_root(void);
 
+/**
+ * tst_cmd_present() - Check if a command is present
+ * @cmd: The name of the command to check for.
+ *
+ * This function iterates through the &tst_test->needs_cmds array. It compares
+ * the given command name with each entry in the array and returns the
+ * &tst_cmd->present flag for the matching command.
+ *
+ * Return: `true` if the command is present, `false` otherwise.
+ */
+bool tst_cmd_present(const char *cmd);
+
 /*
  * Validates exit status of child processes
  */

lib/tst_test.c

@@ -1375,6 +1375,24 @@ static const char *default_fs_type(void)
 	return tst_dev_fs_type();
 }
 
+bool tst_cmd_present(const char *cmd)
+{
+	struct tst_cmd *pcmd = tst_test->needs_cmds;
+
+	if (!cmd || cmd[0] == '\0')
+		tst_brk(TBROK, "Invalid cmd");
+
+	while (pcmd->cmd) {
+		if (!strcmp(pcmd->cmd, cmd))
+			return pcmd->present;
+
+		pcmd++;
+	}
+
+	tst_brk(TBROK, "'%s' not checked", cmd);
+	return false;
+}
+
 static void do_setup(int argc, char *argv[])
 {
 	char *tdebug_env = getenv("LTP_ENABLE_DEBUG");