add: implement basic server

src/server.rs

@@ -53,8 +53,9 @@ impl Server {
         fs::create_dir_all(path).with_context(|| "creating directory")?;
         self.rewriter.rewrite_folder(&self.template_dir, path).with_context(|| "generating configs")?;
         // Finally, symlink it to the output folder; only support Linux for now
-        fs::remove_file(&self.config_dir).with_context(|| "removing old symlink")?;
+        let symlink = Path::new(&self.workspace_dir).join("symlink.tmp");
-        std::os::unix::fs::symlink(path, &self.config_dir).with_context(|| "updating symlink")?;
+        std::os::unix::fs::symlink(path, &symlink).with_context(|| "creating symlink")?;
+        fs::rename(symlink, &self.config_dir).with_context(|| "renaming symlink")?;
         Ok(())
     }
 }