[PATCH] tools/lib/api/fs/fs.c: Fix misuse of strncpy()

[Ben Hutchings]

gcc 8 reports:

In function 'fs__env_override',
    inlined from 'fs__get_mountpoint' at fs/fs.c:228:6:
fs/fs.c:222:2: error: 'strncpy' specified bound 4096 equals destination size 
[-Werror=stringop-truncation]
  strncpy(fs->path, override_path, sizeof(fs->path));
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I'm not convinced it makes sense to truncate the copied string here,
but since we're already doing so let's ensure it's still null-
terminated.  Use strlcpy() instead.

Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
Cc: sta...@vger.kernel.org
---
 tools/lib/api/fs/fs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/tools/lib/api/fs/fs.c
+++ b/tools/lib/api/fs/fs.c
@@ -12,6 +12,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/mount.h>
+#include <linux/string.h>
 
 #include "fs.h"
 #include "debug-internal.h"
@@ -219,7 +220,7 @@ static bool fs__env_override(struct fs *
                return false;
 
        fs->found = true;
-       strncpy(fs->path, override_path, sizeof(fs->path));
+       strlcpy(fs->path, override_path, sizeof(fs->path));
        return true;
 }
 

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