bitcoind-tests: find the bitcoind executable no matter where we are running from

Author: apoelstra

bitcoind-tests/tests/setup/mod.rs

@@ -11,8 +11,14 @@ pub fn setup() -> BitcoinD {
     // Create env var BITCOIND_EXE_PATH to point to the ../bitcoind/bin/bitcoind binary
     let key = "BITCOIND_EXE";
     if std::env::var(key).is_err() {
-        let curr_dir_path = std::env::current_dir().unwrap();
-        let bitcoind_path = curr_dir_path.join("bin").join("bitcoind");
+        let mut root_path = std::env::current_dir().unwrap();
+        while std::fs::metadata(root_path.join("LICENSE")).is_err() {
+            if !root_path.pop() {
+                panic!("Could not find LICENSE file; do not know where repo root is.");
+            }
+        }
+
+        let bitcoind_path = root_path.join("bitcoind-tests").join("bin").join("bitcoind");
         std::env::set_var(key, bitcoind_path);
     }