Use OUT_DIR when building

Author: LLFourn

Cargo.toml

@@ -22,7 +22,6 @@ ureq = "2.1"
 bitcoin_hashes = "0.10"
 flate2 = "1.0"
 tar = "0.4"
-home = "0.5.3"
 
 [features]
 "0_21_1" = []

build.rs

@@ -2,7 +2,7 @@ use bitcoin_hashes::{sha256, Hash};
 use flate2::read::GzDecoder;
 use std::fs::File;
 use std::io::{BufRead, BufReader, Read};
-use std::path::PathBuf;
+use std::path::Path;
 use std::str::FromStr;
 use tar::Archive;
 
@@ -36,14 +36,15 @@ fn main() {
     }
     let download_filename = download_filename();
     let expected_hash = get_expected_sha256(&download_filename).unwrap();
-    let bitcoin_exe_home = format!(
-        "{}/bitcoin",
-        home::cargo_home()
-            .expect("cannot determine CARGO_HOME")
-            .display()
-    );
-    let existing_filename: PathBuf =
-        format!("{}/bitcoin-{}/bin/bitcoind", &bitcoin_exe_home, VERSION).into();
+    let out_dir = std::env::var_os("OUT_DIR").unwrap();
+    let bitcoin_exe_home = Path::new(&out_dir).join("bitcoin");
+    if !bitcoin_exe_home.exists() {
+        std::fs::create_dir(&bitcoin_exe_home).unwrap();
+    }
+    let existing_filename = bitcoin_exe_home
+        .join(format!("bitcoin-{}", VERSION))
+        .join("bin")
+        .join("bicoind");
 
     if !existing_filename.exists() {
         println!(

src/lib.rs

@@ -279,11 +279,10 @@ impl From<bitcoincore_rpc::Error> for Error {
 
 /// Provide the bitcoind executable path if a version feature has been specified
 pub fn downloaded_exe_path() -> Option<String> {
-    // CARGO_HOME surely available only in `build.rs` here we need to get from home_dir
     if versions::HAS_FEATURE {
         Some(format!(
             "{}/bitcoin/bitcoin-{}/bin/bitcoind",
-            home::cargo_home().ok()?.display(),
+            env!("OUT_DIR"),
             versions::VERSION
         ))
     } else {