fix interactive shells

eh/src/command.rs

@@ -27,6 +27,7 @@ pub struct NixCommand {
     env: Vec<(String, String)>,
     impure: bool,
     print_build_logs: bool,
+    interactive: bool,
 }
 
 impl NixCommand {
@@ -37,6 +38,7 @@ impl NixCommand {
             env: Vec::new(),
             impure: false,
             print_build_logs: true,
+            interactive: false,
         }
     }
 
@@ -64,6 +66,11 @@ impl NixCommand {
         self
     }
 
+    pub fn interactive(mut self, yes: bool) -> Self {
+        self.interactive = yes;
+        self
+    }
+
     pub fn print_build_logs(mut self, yes: bool) -> Self {
         self.print_build_logs = yes;
         self
@@ -87,6 +94,13 @@ impl NixCommand {
             cmd.env(k, v);
         }
         cmd.args(&self.args);
+
+        if self.interactive {
+            cmd.stdout(Stdio::inherit());
+            cmd.stderr(Stdio::inherit());
+            return cmd.status();
+        }
+
         cmd.stdout(Stdio::piped());
         cmd.stderr(Stdio::piped());
 
@@ -149,8 +163,14 @@ impl NixCommand {
             cmd.env(k, v);
         }
         cmd.args(&self.args);
-        cmd.stdout(Stdio::piped());
+
-        cmd.stderr(Stdio::piped());
+        if self.interactive {
+            cmd.stdout(Stdio::inherit());
+            cmd.stderr(Stdio::inherit());
+        } else {
+            cmd.stdout(Stdio::piped());
+            cmd.stderr(Stdio::piped());
+        }
 
         cmd.output()
     }

eh/src/shell.rs

@@ -10,7 +10,9 @@ pub fn handle_nix_shell(
     fixer: &dyn NixFileFixer,
     classifier: &dyn NixErrorClassifier,
 ) {
-    let mut cmd = NixCommand::new("shell").print_build_logs(true);
+    let mut cmd = NixCommand::new("shell")
+        .print_build_logs(true)
+        .interactive(true);
     for arg in args {
         cmd = cmd.arg(arg);
     }
@@ -18,9 +20,10 @@ pub fn handle_nix_shell(
         .run_with_logs(StdIoInterceptor)
         .expect("failed to run nix shell");
     if status.success() {
-        return;
+        std::process::exit(0);
     }
 
+    // Try to capture error output for retry logic
     let output = NixCommand::new("shell")
         .print_build_logs(true)
         .args(args.iter().cloned())
@@ -33,6 +36,7 @@ pub fn handle_nix_shell(
             info!("{}", Paint::green("✔ Fixed hash mismatch, retrying..."));
             let retry_status = NixCommand::new("shell")
                 .print_build_logs(true)
+                .interactive(true)
                 .args(args.iter().cloned())
                 .run_with_logs(StdIoInterceptor)
                 .unwrap();
@@ -48,6 +52,7 @@ pub fn handle_nix_shell(
             );
             let retry_status = NixCommand::new("shell")
                 .print_build_logs(true)
+                .interactive(true)
                 .args(args.iter().cloned())
                 .env("NIXPKGS_ALLOW_UNFREE", "1")
                 .impure(true)
@@ -64,6 +69,7 @@ pub fn handle_nix_shell(
             );
             let retry_status = NixCommand::new("shell")
                 .print_build_logs(true)
+                .interactive(true)
                 .args(args.iter().cloned())
                 .env("NIXPKGS_ALLOW_INSECURE", "1")
                 .impure(true)
@@ -78,6 +84,7 @@ pub fn handle_nix_shell(
             );
             let retry_status = NixCommand::new("shell")
                 .print_build_logs(true)
+                .interactive(true)
                 .args(args.iter().cloned())
                 .env("NIXPKGS_ALLOW_BROKEN", "1")
                 .impure(true)