[libvirt PATCH v2 3/7] tests: virfilemock: realpath: Allow non-null second parameter

[Tim Wiederhake]

When other preloaded libraries wrap and / or make calls to `realpath`
(e.g. LLVM's AddessSanitizer), the second parameter is no longer
guaranteed to be NULL.

Signed-off-by: Tim Wiederhake <twiederh at redhat.com>
---
 build-aux/syntax-check.mk |  2 +-
 tests/virfilemock.c       | 20 ++++++++++++--------
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/build-aux/syntax-check.mk b/build-aux/syntax-check.mk
index 552d639119..03b7599abc 100644
--- a/build-aux/syntax-check.mk
+++ b/build-aux/syntax-check.mk
@@ -1740,7 +1740,7 @@ exclude_file_name_regexp--sc_libvirt_unmarked_diagnostics = \
 exclude_file_name_regexp--sc_po_check = ^(docs/|src/rpc/gendispatch\.pl$$|tests/commandtest.c$$)
 
 exclude_file_name_regexp--sc_prohibit_PATH_MAX = \
-	^build-aux/syntax-check\.mk$$
+	^(build-aux/syntax-check\.mk|tests/virfilemock.c)$$
 
 exclude_file_name_regexp--sc_prohibit_access_xok = \
 	^(src/util/virutil\.c)$$
diff --git a/tests/virfilemock.c b/tests/virfilemock.c
index 7c9174bdd9..bf153ab769 100644
--- a/tests/virfilemock.c
+++ b/tests/virfilemock.c
@@ -24,7 +24,6 @@
 #if WITH_LINUX_MAGIC_H
 # include <linux/magic.h>
 #endif
-#include <assert.h>
 
 #include "virmock.h"
 #include "virstring.h"
@@ -186,15 +185,20 @@ realpath(const char *path, char *resolved)
 
     if (getenv("LIBVIRT_MTAB")) {
         const char *p;
-        char *ret;
 
-        assert(resolved == NULL);
-        if ((p = STRSKIP(path, "/some/symlink")))
-            ret = g_strdup_printf("/gluster%s", p);
-        else
-            ret = g_strdup(path);
+        if ((p = STRSKIP(path, "/some/symlink"))) {
+            if (resolved)
+                g_snprintf(resolved, PATH_MAX, "/gluster%s", p);
+            else
+                resolved = g_strdup_printf("/gluster%s", p);
+        } else {
+            if (resolved)
+                g_strlcpy(resolved, path, PATH_MAX);
+            else
+                resolved = g_strdup(path);
+        }
 
-        return ret;
+        return resolved;
     }
 
     return real_realpath(path, resolved);
-- 
2.26.3