Release v3.8.4 (#1618)

* Prepare release v3.8.4

* Update test fixtures with the new nix-installer version

* flake.lock: Update

Flake lock file updates:

• Updated input 'determinate':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/determinate/3.8.2/0197ff1f-7dee-7ce8-803b-dee90b5d283c/source.tar.gz?narHash=sha256-eRDO93C2dXNVoLbnNECWwGcMErDKVAXNWWy6hFMPoE8%3D' (2025-07-12)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/determinate/3.8.4/01982b0e-46ed-709c-973b-7096ceb2a596/source.tar.gz?narHash=sha256-jq04XAgT5Rci907wxd69trNwZixpnBLz5tH02h6JcoA%3D' (2025-07-21)
• Updated input 'determinate/determinate-nixd-aarch64-darwin':
    'https://install.determinate.systems/determinate-nixd/tag/v3.8.2/macOS?narHash=sha256-T/kTCi8rrh1r5XMGQBymB4Hnk/KNNGkgtgma6bXXKy0%3D'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.8.4/macOS?narHash=sha256-tEhYb3OWFIPFvWa/orkyBMvS2joRRrqKHpK2cSd20hU%3D'
• Updated input 'determinate/determinate-nixd-aarch64-linux':
    'https://install.determinate.systems/determinate-nixd/tag/v3.8.2/aarch64-linux?narHash=sha256-C%2BKvOykOIoXCWSsPBM2Hzy1skk2lgiKXQyb9fJdwSdQ%3D'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.8.4/aarch64-linux?narHash=sha256-BGDnwwbo30fdSAv26G2MFYKx2%2BqIQ8G40%2BmuwKH9SPM%3D'
• Updated input 'determinate/determinate-nixd-x86_64-linux':
    'https://install.determinate.systems/determinate-nixd/tag/v3.8.2/x86_64-linux?narHash=sha256-cENobOVn0%2BFtON9bmr/QoUEpNGEyxW4YpFXkLyBTYDs%3D'
  → 'https://install.determinate.systems/determinate-nixd/tag/v3.8.4/x86_64-linux?narHash=sha256-P4EJCgSsapE5tggKXiLUeS56PNciGLgonWAm7F1xf6E%3D'
• Updated input 'nix':
    'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.8.2/0197ff19-42da-7beb-b8cf-902b39687ccf/source.tar.gz?narHash=sha256-%2BPLMYzOLXmYtGUcUxIbJZpadAV/gO73EAhISc1kgvJM%3D' (2025-07-12)
  → 'https://api.flakehub.com/f/pinned/DeterminateSystems/nix-src/3.8.4/01982aff-6f3f-7bcc-85c8-b0d4e0cb35d8/source.tar.gz?narHash=sha256-/WmweOcc4DfQPfGkNxllsuEVgTwX3RVROOy3e/mAvr0%3D' (2025-07-21)

* Update Cargo dependencies

* Set Cargo.toml package.version to 3.8.4

* fixup: handle files in the unpacked Nix store

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Cole Helbling <[email protected]>

Author: github-actions[bot]

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 name = "nix-installer"
 description = "The Determinate Nix Installer"
-version = "3.8.2"
+version = "3.8.4"
 edition = "2021"
 resolver = "2"
 license = "LGPL-2.1"

Cargo.toml

@@ -107,10 +107,17 @@ impl Action for MoveUnpackedNix {
             let entry_dest = dest_store.join(entry.file_name());
             if entry_dest.exists() {
                 tracing::trace!(src = %entry.path().display(), dest = %entry_dest.display(), "Removing already existing package");
-                crate::util::remove_dir_all(&entry_dest, OnMissing::Ignore)
-                    .await
-                    .map_err(|e| ActionErrorKind::Remove(entry_dest.clone(), e))
-                    .map_err(Self::error)?;
+                if entry_dest.is_dir() {
+                    crate::util::remove_dir_all(&entry_dest, OnMissing::Ignore)
+                        .await
+                        .map_err(|e| ActionErrorKind::Remove(entry_dest.clone(), e))
+                        .map_err(Self::error)?;
+                } else {
+                    crate::util::remove_file(&entry_dest, OnMissing::Ignore)
+                        .await
+                        .map_err(|e| ActionErrorKind::Remove(entry_dest.clone(), e))
+                        .map_err(Self::error)?;
+                }
             }
             tracing::trace!(src = %entry.path().display(), dest = %entry_dest.display(), "Renaming");
             tokio::fs::rename(&entry.path(), &entry_dest)

flake.lock

@@ -1,5 +1,5 @@
 {
-  "version": "3.8.2",
+  "version": "3.8.4",
   "actions": [
     {
       "action": {

src/action/base/move_unpacked_nix.rs

@@ -1,5 +1,5 @@
 {
-  "version": "3.8.2",
+  "version": "3.8.4",
   "actions": [
     {
       "action": {

tests/fixtures/linux/linux.json

@@ -1,5 +1,5 @@
 {
-  "version": "3.8.2",
+  "version": "3.8.4",
   "actions": [
     {
       "action": {