Remove std::env::set_current_dir() call from EngineState::merge_env() (#12922)

As discussed in https://github.com/nushell/nushell/pull/12749, we no
longer need to call `std::env::set_current_dir()` to sync `$env.PWD`
with the actual working directory. This PR removes the call from
`EngineState::merge_env()`.

crates/nu-cli/src/config_files.rs

@@ -235,15 +235,8 @@ pub fn eval_config_contents(
             engine_state.file = prev_file;
 
             // Merge the environment in case env vars changed in the config
-            match engine_state.cwd(Some(stack)) {
-                Ok(cwd) => {
-                    if let Err(e) = engine_state.merge_env(stack, cwd) {
-                        report_error_new(engine_state, &e);
-                    }
-                }
-                Err(e) => {
-                    report_error_new(engine_state, &e);
-                }
+            if let Err(e) = engine_state.merge_env(stack) {
+                report_error_new(engine_state, &e);
             }
         }
     }

crates/nu-cli/src/repl.rs

@@ -15,10 +15,7 @@ use crate::{
 use crossterm::cursor::SetCursorStyle;
 use log::{error, trace, warn};
 use miette::{ErrReport, IntoDiagnostic, Result};
-use nu_cmd_base::{
-    hook::eval_hook,
-    util::{get_editor, get_guaranteed_cwd},
-};
+use nu_cmd_base::{hook::eval_hook, util::get_editor};
 use nu_color_config::StyleComputer;
 #[allow(deprecated)]
 use nu_engine::{convert_env_values, current_dir_str, env_to_strings};
@@ -118,8 +115,7 @@ pub fn evaluate_repl(
             PipelineData::empty(),
             false,
         );
-        let cwd = get_guaranteed_cwd(engine_state, &unique_stack);
-        engine_state.merge_env(&mut unique_stack, cwd)?;
+        engine_state.merge_env(&mut unique_stack)?;
     }
 
     let hostname = System::host_name();
@@ -281,12 +277,10 @@ fn loop_iteration(ctx: LoopContext) -> (bool, Stack, Reedline) {
         hostname,
     } = ctx;
 
-    let cwd = get_guaranteed_cwd(engine_state, &stack);
-
     let mut start_time = std::time::Instant::now();
     // Before doing anything, merge the environment from the previous REPL iteration into the
     // permanent state.
-    if let Err(err) = engine_state.merge_env(&mut stack, cwd) {
+    if let Err(err) = engine_state.merge_env(&mut stack) {
         report_error_new(engine_state, &err);
     }
     perf(

crates/nu-cli/tests/completions/mod.rs

@@ -18,11 +18,11 @@ use support::{
 #[fixture]
 fn completer() -> NuCompleter {
     // Create a new engine
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Add record value as example
     let record = "def tst [--mod -s] {}";
-    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack).is_ok());
 
     // Instantiate a new completer
     NuCompleter::new(Arc::new(engine), Arc::new(stack))
@@ -31,12 +31,12 @@ fn completer() -> NuCompleter {
 #[fixture]
 fn completer_strings() -> NuCompleter {
     // Create a new engine
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Add record value as example
     let record = r#"def animals [] { ["cat", "dog", "eel" ] }
     def my-command [animal: string@animals] { print $animal }"#;
-    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack).is_ok());
 
     // Instantiate a new completer
     NuCompleter::new(Arc::new(engine), Arc::new(stack))
@@ -45,7 +45,7 @@ fn completer_strings() -> NuCompleter {
 #[fixture]
 fn extern_completer() -> NuCompleter {
     // Create a new engine
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Add record value as example
     let record = r#"
@@ -56,7 +56,7 @@ fn extern_completer() -> NuCompleter {
             -b: string@animals
         ]
     "#;
-    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack).is_ok());
 
     // Instantiate a new completer
     NuCompleter::new(Arc::new(engine), Arc::new(stack))
@@ -65,7 +65,7 @@ fn extern_completer() -> NuCompleter {
 #[fixture]
 fn custom_completer() -> NuCompleter {
     // Create a new engine
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Add record value as example
     let record = r#"
@@ -79,7 +79,7 @@ fn custom_completer() -> NuCompleter {
             completer: $external_completer
         }
     "#;
-    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack).is_ok());
 
     // Instantiate a new completer
     NuCompleter::new(Arc::new(engine), Arc::new(stack))
@@ -705,11 +705,11 @@ fn folder_with_directorycompletions() {
 #[test]
 fn variables_completions() {
     // Create a new engine
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Add record value as example
     let record = "let actor = { name: 'Tom Hardy', age: 44 }";
-    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(record.as_bytes(), &mut engine, &mut stack).is_ok());
 
     // Instantiate a new completer
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
@@ -812,11 +812,11 @@ fn variables_completions() {
 
 #[test]
 fn alias_of_command_and_flags() {
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Create an alias
     let alias = r#"alias ll = ls -l"#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
 
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
 
@@ -831,11 +831,11 @@ fn alias_of_command_and_flags() {
 
 #[test]
 fn alias_of_basic_command() {
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Create an alias
     let alias = r#"alias ll = ls "#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
 
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
 
@@ -850,14 +850,14 @@ fn alias_of_basic_command() {
 
 #[test]
 fn alias_of_another_alias() {
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Create an alias
     let alias = r#"alias ll = ls -la"#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir.clone()).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
     // Create the second alias
     let alias = r#"alias lf = ll -f"#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
 
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
 
@@ -874,7 +874,7 @@ fn run_external_completion(completer: &str, input: &str) -> Vec<Suggestion> {
     let completer = format!("$env.config.completions.external.completer = {completer}");
 
     // Create a new engine
-    let (dir, _, mut engine_state, mut stack) = new_engine();
+    let (_, _, mut engine_state, mut stack) = new_engine();
     let (block, delta) = {
         let mut working_set = StateWorkingSet::new(&engine_state);
         let block = parse(&mut working_set, None, completer.as_bytes(), false);
@@ -890,7 +890,7 @@ fn run_external_completion(completer: &str, input: &str) -> Vec<Suggestion> {
     );
 
     // Merge environment into the permanent state
-    assert!(engine_state.merge_env(&mut stack, &dir).is_ok());
+    assert!(engine_state.merge_env(&mut stack).is_ok());
 
     // Instantiate a new completer
     let mut completer = NuCompleter::new(Arc::new(engine_state), Arc::new(stack));
@@ -1068,11 +1068,11 @@ fn custom_completer_triggers_cursor_after_word(mut custom_completer: NuCompleter
 #[ignore = "was reverted, still needs fixing"]
 #[rstest]
 fn alias_offset_bug_7648() {
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Create an alias
     let alias = r#"alias ea = ^$env.EDITOR /tmp/test.s"#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
 
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
 
@@ -1087,11 +1087,11 @@ fn alias_offset_bug_7648() {
 #[ignore = "was reverted, still needs fixing"]
 #[rstest]
 fn alias_offset_bug_7754() {
-    let (dir, _, mut engine, mut stack) = new_engine();
+    let (_, _, mut engine, mut stack) = new_engine();
 
     // Create an alias
     let alias = r#"alias ll = ls -l"#;
-    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack, dir).is_ok());
+    assert!(support::merge_input(alias.as_bytes(), &mut engine, &mut stack).is_ok());
 
     let mut completer = NuCompleter::new(Arc::new(engine), Arc::new(stack));
 

crates/nu-cli/tests/completions/support/completions_helpers.rs

@@ -62,7 +62,7 @@ pub fn new_engine() -> (PathBuf, String, EngineState, Stack) {
     );
 
     // Merge environment into the permanent state
-    let merge_result = engine_state.merge_env(&mut stack, &dir);
+    let merge_result = engine_state.merge_env(&mut stack);
     assert!(merge_result.is_ok());
 
     (dir, dir_str, engine_state, stack)
@@ -97,7 +97,7 @@ pub fn new_quote_engine() -> (PathBuf, String, EngineState, Stack) {
     );
 
     // Merge environment into the permanent state
-    let merge_result = engine_state.merge_env(&mut stack, &dir);
+    let merge_result = engine_state.merge_env(&mut stack);
     assert!(merge_result.is_ok());
 
     (dir, dir_str, engine_state, stack)
@@ -132,7 +132,7 @@ pub fn new_partial_engine() -> (PathBuf, String, EngineState, Stack) {
     );
 
     // Merge environment into the permanent state
-    let merge_result = engine_state.merge_env(&mut stack, &dir);
+    let merge_result = engine_state.merge_env(&mut stack);
     assert!(merge_result.is_ok());
 
     (dir, dir_str, engine_state, stack)
@@ -173,7 +173,6 @@ pub fn merge_input(
     input: &[u8],
     engine_state: &mut EngineState,
     stack: &mut Stack,
-    dir: PathBuf,
 ) -> Result<(), ShellError> {
     let (block, delta) = {
         let mut working_set = StateWorkingSet::new(engine_state);
@@ -196,5 +195,5 @@ pub fn merge_input(
     .is_ok());
 
     // Merge environment into the permanent state
-    engine_state.merge_env(stack, &dir)
+    engine_state.merge_env(stack)
 }

crates/nu-cmd-base/src/hook.rs

@@ -1,4 +1,3 @@
-use crate::util::get_guaranteed_cwd;
 use miette::Result;
 use nu_engine::{eval_block, eval_block_with_early_return};
 use nu_parser::parse;
@@ -284,8 +283,7 @@ pub fn eval_hook(
         }
     }
 
-    let cwd = get_guaranteed_cwd(engine_state, stack);
-    engine_state.merge_env(stack, cwd)?;
+    engine_state.merge_env(stack)?;
 
     Ok(output)
 }

crates/nu-cmd-lang/src/example_support.rs

@@ -138,7 +138,7 @@ pub fn check_example_evaluates_to_expected_output(
     stack.add_env_var("PWD".to_string(), Value::test_string(cwd.to_string_lossy()));
 
     engine_state
-        .merge_env(&mut stack, cwd)
+        .merge_env(&mut stack)
         .expect("Error merging environment");
 
     let empty_input = PipelineData::empty();

crates/nu-protocol/src/engine/engine_state.rs

@@ -277,11 +277,7 @@ impl EngineState {
     }
 
     /// Merge the environment from the runtime Stack into the engine state
-    pub fn merge_env(
-        &mut self,
-        stack: &mut Stack,
-        cwd: impl AsRef<Path>,
-    ) -> Result<(), ShellError> {
+    pub fn merge_env(&mut self, stack: &mut Stack) -> Result<(), ShellError> {
         let mut config_updated = false;
 
         for mut scope in stack.env_vars.drain(..) {
@@ -311,9 +307,6 @@ impl EngineState {
             }
         }
 
-        // TODO: better error
-        std::env::set_current_dir(cwd)?;
-
         if config_updated {
             // Make plugin GC config changes take effect immediately.
             #[cfg(feature = "plugin")]

crates/nu-std/src/lib.rs

@@ -98,8 +98,7 @@ use std pwd
 
     eval_block::<WithoutDebug>(engine_state, &mut stack, &block, pipeline_data)?;
 
-    let cwd = engine_state.cwd(Some(&stack))?;
-    engine_state.merge_env(&mut stack, cwd)?;
+    engine_state.merge_env(&mut stack)?;
 
     Ok(())
 }

src/config_files.rs

@@ -164,15 +164,8 @@ pub(crate) fn read_default_env_file(engine_state: &mut EngineState, stack: &mut
     );
 
     // Merge the environment in case env vars changed in the config
-    match engine_state.cwd(Some(stack)) {
-        Ok(cwd) => {
-            if let Err(e) = engine_state.merge_env(stack, cwd) {
-                report_error_new(engine_state, &e);
-            }
-        }
-        Err(e) => {
-            report_error_new(engine_state, &e);
-        }
+    if let Err(e) = engine_state.merge_env(stack) {
+        report_error_new(engine_state, &e);
     }
 }
 
@@ -202,15 +195,8 @@ fn eval_default_config(
     );
 
     // Merge the environment in case env vars changed in the config
-    match engine_state.cwd(Some(stack)) {
-        Ok(cwd) => {
-            if let Err(e) = engine_state.merge_env(stack, cwd) {
-                report_error_new(engine_state, &e);
-            }
-        }
-        Err(e) => {
-            report_error_new(engine_state, &e);
-        }
+    if let Err(e) = engine_state.merge_env(stack) {
+        report_error_new(engine_state, &e);
     }
 }
 

src/test_bins.rs

@@ -250,13 +250,9 @@ pub fn nu_repl() {
     for (i, line) in source_lines.iter().enumerate() {
         let mut stack = Stack::with_parent(top_stack.clone());
 
-        let cwd = engine_state
-            .cwd(Some(&stack))
-            .unwrap_or_else(|err| outcome_err(&engine_state, &err));
-
         // Before doing anything, merge the environment from the previous REPL iteration into the
         // permanent state.
-        if let Err(err) = engine_state.merge_env(&mut stack, &cwd) {
+        if let Err(err) = engine_state.merge_env(&mut stack) {
             outcome_err(&engine_state, &err);
         }