Don't rely on mkdir returning EEXISTS (fixing NFS)

For NFS mounts if we call mkdir() on a read-only mount (such as when
we've created a read-only bind mount) the kernel will nor return EEXIST
even when the directory exists, instead returning EROFS.

So, we add (and use) an ensure_dir() helper that stats before calling
mkdir.

Closes: #258
Approved by: giuseppe

1 files changed, 2 insertions, 0 deletions

diff --git a/utils.h b/utils.h
index c0b98bb..52cf772 100644
--- a/utils.h
+++ b/utils.h
@@ -101,6 +101,8 @@ int   create_file (const char *path,
                    const char *content);
 int   ensure_file (const char *path,
                    mode_t      mode);
+int   ensure_dir (const char *path,
+                  mode_t      mode);
 int   get_file_mode (const char *pathname);
 int   mkdir_with_parents (const char *pathname,
                           int         mode,