From 0b6d723db3140e79705ba982579e99b6b9268998 Mon Sep 17 00:00:00 2001
From: Ana Hobden <operator@hoverbear.org>
Date: Fri, 23 Jun 2023 11:42:18 -0700
Subject: [PATCH] Uninstalling should change directory if in nix (#526)

* Change directory during uninstall if run from /nix

* Include log message
---
 src/action/common/provision_nix.rs |  5 ++---
 src/cli/subcommand/uninstall.rs    | 12 ++++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/action/common/provision_nix.rs b/src/action/common/provision_nix.rs
index 0c28278..e05a209 100644
--- a/src/action/common/provision_nix.rs
+++ b/src/action/common/provision_nix.rs
@@ -1,10 +1,9 @@
-use nix::unistd::Group;
 use tracing::{span, Span};
 
-use super::{CreateNixTree, DeleteUsersInGroup};
+use super::CreateNixTree;
 use crate::{
     action::{
-        base::{CreateGroup, FetchAndUnpackNix, MoveUnpackedNix},
+        base::{FetchAndUnpackNix, MoveUnpackedNix},
         Action, ActionDescription, ActionError, ActionErrorKind, ActionTag, StatefulAction,
     },
     settings::{CommonSettings, SCRATCH_DIR},
diff --git a/src/cli/subcommand/uninstall.rs b/src/cli/subcommand/uninstall.rs
index 2a7bd7e..1ff2e1b 100644
--- a/src/cli/subcommand/uninstall.rs
+++ b/src/cli/subcommand/uninstall.rs
@@ -54,6 +54,18 @@ impl CommandExecute for Uninstall {
 
         ensure_root()?;
 
+        if let Ok(current_dir) = std::env::current_dir() {
+            let mut components = current_dir.components();
+            let should_be_root = components.next();
+            let maybe_nix = components.next();
+            if should_be_root == Some(std::path::Component::RootDir)
+                && maybe_nix == Some(std::path::Component::Normal(std::ffi::OsStr::new("nix")))
+            {
+                tracing::debug!("Changing current directory to be outside of `/nix`");
+                std::env::set_current_dir("/").wrap_err("Uninstall process was run from `/nix` folder, but could not change directory away from `/nix`, please change the current directory and try again.")?;
+            }
+        }
+
         // During install, `nix-installer` will store a copy of itself in `/nix/nix-installer`
         // If the user opted to run that particular copy of `nix-installer` to do this uninstall,
         // well, we have a problem, since the binary would delete itself.