diff --git a/Cargo.lock b/Cargo.lock
index d5c319a7..3d3201f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -492,6 +492,7 @@ dependencies = [
  "tempfile",
  "typenum",
  "url",
+ "which",
  "windows-sys 0.52.0",
  "xz2",
  "zip",
@@ -542,6 +543,15 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6fe2267d4ed49bc07b63801559be28c718ea06c4738b7a03c94df7386d2cde46"
 
+[[package]]
+name = "home"
+version = "0.5.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
+dependencies = [
+ "windows-sys 0.52.0",
+]
+
 [[package]]
 name = "idna"
 version = "0.5.0"
@@ -1069,6 +1079,18 @@ version = "0.11.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
 
+[[package]]
+name = "which"
+version = "7.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c9cad3279ade7346b96e38731a641d7343dd6a53d55083dd54eadfa5a1b38c6b"
+dependencies = [
+ "either",
+ "home",
+ "rustix",
+ "winsafe",
+]
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -1151,6 +1173,12 @@ version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
+[[package]]
+name = "winsafe"
+version = "0.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904"
+
 [[package]]
 name = "xattr"
 version = "1.3.1"
diff --git a/Cargo.toml b/Cargo.toml
index 91b738da..53b828e4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -54,6 +54,7 @@ tee = "0.1"
 tempfile = "3"
 typenum = "1"
 url = "2"
+which = "7"
 
 [dependencies.bstr]
 version = "1"
diff --git a/src/hg_connect_stdio.rs b/src/hg_connect_stdio.rs
index 1490dac4..7790b401 100644
--- a/src/hg_connect_stdio.rs
+++ b/src/hg_connect_stdio.rs
@@ -231,6 +231,17 @@ pub fn get_stdio_connection(url: &Url, flags: c_int) -> Option<Box<dyn HgRepo>>
         path.as_os_str().as_bytes().to_owned()
     };
     let path = CString::new(path).unwrap();
+    warn!(target: "root", "{:?}", which::which("hg"));
+    if let Ok(hg) = which::which("hg") {
+        use bstr::ByteSlice;
+        let output = std::process::Command::new(hg).arg("--version").output().unwrap();
+        warn!(target: "root", "{}", output.stdout.as_bstr());
+        warn!(target: "root", "{}", output.stderr.as_bstr());
+
+        let output = std::process::Command::new("/bin/sh").args(["-x", "-c", "hg --version"]).output().unwrap();
+        warn!(target: "root", "{}", output.stdout.as_bstr());
+        warn!(target: "root", "{}", output.stderr.as_bstr());
+    }
     let proc = unsafe {
         hg_connect_stdio(
             userhost.as_ref().map_or(ptr::null(), |s| s.as_ptr()),