Fix: Run the version detection steps in the selected rust-src-dir directory.

This should enable the version selection even without a default
toolchain installed.

Fixes #74.

CHANGELOG.md

@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.15.2] - 2025-10-04
+
+* Fix: Run the version detection steps in the selected `rust-src-dir` directory.
+    This should enable the version selection even without a default toolchain installed.
+    Fixes #74.
+
+## [1.15.1] - 2025-09-23
+
+* Update `Swatinem/rust-cache` to v2.8.1
+
 ## [1.15.0] - 2025-09-14
 
 * Add support for non-root source directory.

action.yml

@@ -169,8 +169,18 @@ runs:
         rust_src_dir: ${{inputs.rust-src-dir}}
       shell: bash
       run: |
-        if [[ -d "$rust_src_dir" ]]; then
-          cd "$rust_src_dir"
+        # Check if value is set
+        if [[ -n "$rust_src_dir" ]]
+        then
+          # If value is set the directory must exist
+          if [[ -d "$rust_src_dir" ]]
+          then
+            cd "$rust_src_dir"
+          else
+            echo "'rust-src-dir' does not point to an existing directory" >&2
+            echo "The value of 'rust-src-dir' is: ${rust_src_dir}" >&2
+            exit 1
+          fi
         fi
         if [[ -z "$toolchain" && ( -f "rust-toolchain" || -f "rust-toolchain.toml") ]]
         then
@@ -201,6 +211,8 @@ runs:
     - id: versions
       name: Print installed versions
       shell: bash
+      # Switch to the Rust sub-directory
+      working-directory: ${{inputs.rust-src-dir || '.'}}
       run: |
         echo "rustc-version=$(rustc --version)" >> $GITHUB_OUTPUT
         rustc --version --verbose
@@ -227,7 +239,7 @@ runs:
 
     - name: Setup Rust Caching
       if: inputs.cache == 'true'
-      uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
+      uses: Swatinem/rust-cache@f13886b937689c021905a6b90929199931d60db1 # v2.8.1
       with:
         workspaces: ${{ inputs.cache-workspaces || inputs.rust-src-dir }}
         cache-directories: ${{inputs.cache-directories}}