From 05dffe67919ffc72be5c017bc6cf82f164b2e8f9 Mon Sep 17 00:00:00 2001
From: Emil Renner Berthing <systemd@esmil.dk>
Date: Mon, 23 Oct 2017 11:42:03 -0700
Subject: [PATCH 07/12] check for missing canonicalize_file_name

Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
Upstream-Status: Pending

 configure.ac                | 2 ++
 src/basic/missing.h         | 1 +
 src/basic/missing_syscall.h | 6 ++++++
 3 files changed, 9 insertions(+)

diff --git a/configure.ac b/configure.ac
index cd035a971..3674190fb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -333,6 +333,7 @@ AC_CHECK_DECLS([
         renameat2,
         kcmp,
         keyctl,
+        canonicalize_file_name,
         LO_FLAGS_PARTSCAN,
         copy_file_range,
         explicit_bzero],
@@ -343,6 +344,7 @@ AC_CHECK_DECLS([
 #include <fcntl.h>
 #include <sched.h>
 #include <string.h>
+#include <stdlib.h>
 #include <linux/loop.h>
 ]])
 
diff --git a/src/basic/missing.h b/src/basic/missing.h
index 671f341c6..8ae4964e1 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -1246,3 +1246,4 @@ struct ethtool_link_settings {
 #endif
 
 #include "missing_syscall.h"
+
diff --git a/src/basic/missing_syscall.h b/src/basic/missing_syscall.h
index 898116c7b..4d44ee4fa 100644
--- a/src/basic/missing_syscall.h
+++ b/src/basic/missing_syscall.h
@@ -28,6 +28,12 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
 }
 #endif
 
+#if !HAVE_DECL_CANONICALIZE_FILE_NAME
+static inline char *canonicalize_file_name(const char *path) {
+        return realpath(path, NULL);
+}
+#endif
+
 /* ======================================================================= */
 
 #if !HAVE_DECL_MEMFD_CREATE
-- 
2.14.2