Hash project path to generate unique remote build dir

This is useful when you have the same project checked out multiple times
and don't want to share the build dir (because you work on different
stuff).

src/main.rs

@@ -1,5 +1,7 @@
 use std::path::{Path, PathBuf};
 use std::process::{exit, Command, Stdio};
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
 use structopt::StructOpt;
 use toml::Value;
 
@@ -127,20 +129,7 @@ fn main() {
     let project_metadata = metadata_cmd.exec().unwrap();
     let project_dir = project_metadata.workspace_root;
     info!("Project dir: {:?}", project_dir);
-    let mut manifest_path = project_dir.clone();
-    manifest_path.push("Cargo.toml");
-    let project_name = project_metadata
-        .packages
-        .iter()
-        .find(|p| p.manifest_path == manifest_path)
-        .map_or_else(
-            || {
-                info!("No metadata found. Setting the remote dir name like the local. Or use --manifest_path for execute");
-                project_dir.file_name().and_then(|x| x.to_str()).unwrap()
-            },
-            |p| &p.name,
-        );
-    info!("Project name: {:?}", project_name);
+
     let configs = vec![
         config_from_file(&project_dir.join(".cargo-remote.toml")),
         xdg::BaseDirectories::with_prefix("cargo-remote")
@@ -162,7 +151,10 @@ fn main() {
             exit(-3);
         });
 
-    let build_path = format!("~/remote-builds/{:?}/", project_name);
+    // generate a unique build path by using the hashed project dir as folder on the remote machine
+    let mut hasher = DefaultHasher::new();
+    project_dir.hash(&mut hasher);
+    let build_path = format!("~/remote-builds/{:?}/", hasher.finish());
 
     info!("Transferring sources to build server.");
     // transfer project to build server