[Libguestfs] [PATCH 1/2] mllib: add helper mkdir_p

[Pino Toscano]

Small function to create in OCaml-based code a directory and its
parents, much like `mkdir -p`.
---
 mllib/common_utils.ml  | 11 +++++++++++
 mllib/common_utils.mli |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/mllib/common_utils.ml b/mllib/common_utils.ml
index 898be17..76d8b79 100644
--- a/mllib/common_utils.ml
+++ b/mllib/common_utils.ml
@@ -673,3 +673,14 @@ let qemu_input_filename filename =
     "./" ^ filename
   else
     filename
+
+let rec mkdir_p path permissions =
+  try Unix.mkdir path permissions
+  with
+  | Unix.Unix_error (Unix.EEXIST, _, _) -> ()
+  | Unix.Unix_error (Unix.ENOENT, _, _) ->
+    (* A component in the path does not exist, so first try
+     * creating the parent directory, and then again the requested
+     * directory. *)
+    mkdir_p (Filename.dirname path) permissions;
+    Unix.mkdir path permissions
diff --git a/mllib/common_utils.mli b/mllib/common_utils.mli
index 5d3149a..28ba648 100644
--- a/mllib/common_utils.mli
+++ b/mllib/common_utils.mli
@@ -147,3 +147,6 @@ val qemu_input_filename : string -> string
     try to interpret that as "foo" in the file:/// protocol.  To
     avoid that, if the path is relative prefix it with "./" since
     qemu-img won't try to interpret such a path. *)
+
+val mkdir_p : string -> int -> unit
+(** Creates a directory, and its parents if missing. *)
-- 
2.1.0