Add some logging (#211)

Author: DonJayamanne

crates/pet/src/locators.rs

@@ -99,12 +99,20 @@ pub fn identify_python_environment_using_locators(
     global_env_search_paths: &[PathBuf],
 ) -> Option<PythonEnvironment> {
     let executable = env.executable.clone();
+    trace!(
+        "Identifying Python environment using locators: {:?}",
+        executable
+    );
     if let Some(env) = locators.iter().fold(
         None,
         |e, loc| if e.is_some() { e } else { loc.try_from(env) },
     ) {
         return Some(env);
     }
+    trace!(
+        "Failed to identify Python environment using locators, now trying to resolve: {:?}",
+        executable
+    );
 
     // Yikes, we have no idea what this is.
     // Lets get the actual interpreter info and try to figure this out.

crates/pet/src/resolve.rs

@@ -30,16 +30,32 @@ pub fn resolve_environment(
     // First check if executable is actually a file or a path.
     let mut executable = executable.to_owned();
     if executable.is_dir() {
+        trace!(
+            "Looking to resolve Python executable in provided directory, {:?}, file = {:?}, sylink = {:?}, metadata = {:?}",
+            executable,
+            executable.is_file(),
+            executable.is_symlink(),
+            executable.metadata(),
+        );
         executable = match find_executable(&executable) {
             Some(exe) => exe,
             None => {
                 warn!("Could not find Python executable in {:?}", executable);
                 executable
             }
         };
+        trace!(
+            "Found Python executable in provided directory, {:?}",
+            executable
+        );
     }
     // First check if this is a known environment
     let env = PythonEnv::new(executable.to_owned(), None, None);
+    trace!(
+        "In resolve_environment, looking for Python Env {:?} in {:?}",
+        env,
+        executable
+    );
     let global_env_search_paths: Vec<PathBuf> = get_search_paths_from_env_variables(os_environment);
 
     if let Some(env) =