Clean up code and add comment

wasmerio · Oct 1, 2020 · 7e097b4 · 7e097b4
1 parent ad05114
commit 7e097b4
Showing 1 changed file with 3 additions and 10 deletions.
diff --git a/lib/wasi/src/state/builder.rs b/lib/wasi/src/state/builder.rs
@@ -438,16 +438,9 @@ impl PreopenDirBuilder {
 
     /// Make this preopened directory appear to the WASI program as `alias`
     pub fn alias(&mut self, alias: &str) -> &mut Self {
-        let alias = if let Some(first_byte) = alias.as_bytes().first() {
-            if *first_byte == b'/' {
-                &alias[1..]
-            } else {
-                alias
-            }
-        } else {
-            alias
-        }
-        .to_string();
+        // We mount at preopened dirs at `/` by default and multiple `/` in a row
+        // are equal to a single `/`.
+        let alias = alias.trim_start_matches(b'/');
         self.alias = Some(alias);
 
         self