fix: Fixes mount failure when subdirectory in chroot does not exist

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "tiffin"
 description = "A minimal container runtime for Linux for setting up chroot-like environments"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 keywords = ["container", "runtime", "chroot", "linux", "nix"]
 license = "MIT"

src/lib.rs

@@ -31,14 +31,23 @@ impl MountTarget {
         }
     }
 
+    #[tracing::instrument]
     pub fn mount(
         &self,
         source: &PathBuf,
         root: &Path,
     ) -> Result<UnmountDrop<Mount>, Box<dyn Error>> {
         // sanitize target path
         let target = self.target.strip_prefix("/").unwrap_or(&self.target);
-        let target = root.join(target).canonicalize()?;
+        tracing::info!(?root, "Mounting {:?} to {:?}", source, target);
+        let target = {
+            let t = root.join(target);
+            if !target.exists() {
+                // create the target directory
+                std::fs::create_dir_all(&target)?;
+            }
+            t
+        };
 
         std::fs::create_dir_all(&target)?;