Fix: implicitely create directories on file saving

libimagstore/src/lazyfile.rs

@@ -2,7 +2,7 @@
 use error::{StoreError, StoreErrorKind};
 use std::io::{Seek, SeekFrom};
 use std::path::{Path, PathBuf};
-use std::fs::{File, OpenOptions};
+use std::fs::{File, OpenOptions, create_dir_all};
 
 /**
  * LazyFile type
@@ -20,6 +20,12 @@ fn open_file<A: AsRef<Path>>(p: A) -> ::std::io::Result<File> {
 }
 
 fn create_file<A: AsRef<Path>>(p: A) -> ::std::io::Result<File> {
+    if let Some(parent) = p.as_ref().parent() {
+        debug!("Implicitely creating directory: {:?}", parent);
+        if let Err(e) = create_dir_all(parent) {
+            return Err(e);
+        }
+    }
     OpenOptions::new().write(true).read(true).create(true).open(p)
 }