From eb8f1938dc12086361b91866db2fa9fc9a2bd15d Mon Sep 17 00:00:00 2001
From: Ariadne Conill <ariadne@dereferenced.org>
Date: Sat, 25 Jul 2020 01:58:20 -0600
Subject: [PATCH] libifupdown: add utility function to determine if a path is
 executable

---
 libifupdown/execute.c | 15 +++++++++++++++
 libifupdown/execute.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/libifupdown/execute.c b/libifupdown/execute.c
index 04d29e6..b1242d5 100644
--- a/libifupdown/execute.c
+++ b/libifupdown/execute.c
@@ -20,6 +20,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <spawn.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
@@ -58,3 +59,17 @@ lif_execute_fmt(const struct lif_execute_opts *opts, char *const envp[], const c
 
 	return WIFEXITED(status) && WEXITSTATUS(status) == 0;
 }
+
+bool
+lif_file_is_executable(const char *path)
+{
+	struct stat st;
+
+	if (stat(path, &st))
+		return false;
+
+	if (!S_ISREG(st.st_mode))
+		return false;
+
+	return access(path, X_OK);
+}
diff --git a/libifupdown/execute.h b/libifupdown/execute.h
index b1f2eb5..3fce6ff 100644
--- a/libifupdown/execute.h
+++ b/libifupdown/execute.h
@@ -25,5 +25,6 @@ struct lif_execute_opts {
 };
 
 extern bool lif_execute_fmt(const struct lif_execute_opts *opts, char *const envp[], const char *fmt, ...);
+extern bool lif_file_is_executable(const char *path);
 
 #endif