From d7c14d66958d5539104c36a87c6a0f4f3996bdee Mon Sep 17 00:00:00 2001
From: Cole Helbling <cole.helbling@determinate.systems>
Date: Fri, 3 Mar 2023 09:49:46 -0800
Subject: [PATCH] Detect WSL1 and error (#297)

* Detect WSL1 and error

WSL1 is not supported because some things Nix relies on to work are not
available.

* Update linux.rs

* Add link to MS docs on WSL1 -> WSL2 upgrade
---
 src/planner/linux.rs | 4 ++++
 src/planner/mod.rs   | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/src/planner/linux.rs b/src/planner/linux.rs
index 9eab5b3..7b947e5 100644
--- a/src/planner/linux.rs
+++ b/src/planner/linux.rs
@@ -39,6 +39,10 @@ impl Planner for Linux {
             return Err(PlannerError::NixOs);
         }
 
+        if std::env::var("WSL_DISTRO_NAME").is_ok() && std::env::var("WSL_INTEROP").is_err() {
+            return Err(PlannerError::Wsl1);
+        }
+
         // We currently do not support SELinux
         match Command::new("getenforce").output().await {
             Ok(output) => {
diff --git a/src/planner/mod.rs b/src/planner/mod.rs
index cbb1563..c46d797 100644
--- a/src/planner/mod.rs
+++ b/src/planner/mod.rs
@@ -301,6 +301,8 @@ pub enum PlannerError {
     NixOs,
     #[error("`nix` is already a valid command, so it is installed")]
     NixExists,
+    #[error("WSL1 is not supported, please upgrade to WSL2: https://learn.microsoft.com/en-us/windows/wsl/install#upgrade-version-from-wsl-1-to-wsl-2")]
+    Wsl1,
 }
 
 impl HasExpectedErrors for PlannerError {
@@ -315,6 +317,7 @@ impl HasExpectedErrors for PlannerError {
             PlannerError::Custom(_) => None,
             this @ PlannerError::NixOs => Some(Box::new(this)),
             this @ PlannerError::NixExists => Some(Box::new(this)),
+            this @ PlannerError::Wsl1 => Some(Box::new(this)),
         }
     }
 }