Bump version to 1.4.0

Exclude versions 1.66 and 1.67, which don't support stable sparse registry.

.github/workflows/ci.yml

@@ -15,7 +15,10 @@ jobs:
       matrix:
         rust: [
           # Test with toolchain file override
-          "1.50",
+          "1.60",
+          # Test that the sparse registry check works.
+          # 1.66 and 1.67 don't support stable sparse registry.
+          "1.66",
           "nightly",
           "beta",
           "stable",
@@ -27,13 +30,13 @@ jobs:
         run: |
           cat <<EOF >>rust-toolchain.toml
           [toolchain]
-          channel = "nightly-2020-07-10"
+          channel = "nightly-2022-09-10"
           components = [ "rustfmt", "rustc-dev" ]
           targets = [ "wasm32-unknown-unknown", "thumbv2-none-eabi" ]
           profile = "minimal"
           EOF
         shell: bash
-        if: matrix.rust == '1.50'
+        if: matrix.rust == '1.60'
 
       - uses: ./
         name: Run actions-rust-lang/setup-rust-toolchain ${{matrix.rust}}
@@ -48,3 +51,10 @@ jobs:
         run: echo '${{steps.toolchain.outputs.rustup-version}}'
       - run: rustc --version && cargo --version
         shell: bash
+
+      # Test with creating a small project
+      - run: cargo init . --bin --name ci
+      # Add tiny empty crate.
+      # This checks that registry access works.
+      - run: cargo add serde_as
+      - run: cargo check

CHANGELOG.md

@@ -5,7 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased]
+## [1.4.0] - 2023-02-13
+
+### Changed
+
+* Only set environment variables, if they are not set before.
+    This allows setting environment variables before using this action and keeping their values.
+* Enable stable sparse registry, except on versions 1.66 and 1.67 where this leads to errors.
 
 ## [1.3.7] - 2023-01-31
 

action.yml

@@ -57,19 +57,27 @@ runs:
     # The environment variables always need to be set before the caching action
     - name: "Setting Environment Variables"
       run: |
-        echo "CARGO_INCREMENTAL=0" >> $GITHUB_ENV
-        echo "CARGO_PROFILE_DEV_DEBUG=0" >> $GITHUB_ENV
-        echo "CARGO_TERM_COLOR=always" >> $GITHUB_ENV
-        echo "RUST_BACKTRACE=short" >> $GITHUB_ENV
-        echo "RUSTFLAGS=-D warnings" >> $GITHUB_ENV
+        if [[ ! -v CARGO_INCREMENTAL ]]; then
+          echo "CARGO_INCREMENTAL=0" >> $GITHUB_ENV
+        fi
+        if [[ ! -v CARGO_PROFILE_DEV_DEBUG ]]; then
+          echo "CARGO_PROFILE_DEV_DEBUG=0" >> $GITHUB_ENV
+        fi
+        if [[ ! -v CARGO_TERM_COLOR ]]; then
+          echo "CARGO_TERM_COLOR=always" >> $GITHUB_ENV
+        fi
+        if [[ ! -v RUST_BACKTRACE ]]; then
+          echo "RUST_BACKTRACE=short" >> $GITHUB_ENV
+        fi
+        if [[ ! -v RUSTFLAGS ]]; then
+          echo "RUSTFLAGS=-D warnings" >> $GITHUB_ENV
+        fi
         # Enable faster sparse index on nightly
         # The value is ignored on stable and causes no problems
         # https://internals.rust-lang.org/t/call-for-testing-cargo-sparse-registry/16862
-        echo "CARGO_UNSTABLE_SPARSE_REGISTRY=true" >> $GITHUB_ENV
-        # Enable sparse index after stabilization
-        # This causes warnings on stable 1.67, e.g., when using "cargo add"
-        # https://github.com/rust-lang/cargo/pull/11224
-        # echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
+        if [[ ! -v CARGO_UNSTABLE_SPARSE_REGISTRY ]]; then
+          echo "CARGO_UNSTABLE_SPARSE_REGISTRY=true" >> $GITHUB_ENV
+        fi
       shell: bash
     - name: "Install Rust Problem Matcher"
       run: echo "::add-matcher::${{ github.action_path }}/rust.json"
@@ -111,6 +119,18 @@ runs:
         echo "cachekey=$(echo $DATE$HASH | head -c12)" >> $GITHUB_OUTPUT
       shell: bash
 
+    # Copied from dtolnay/rust-toolchain and adapted
+    # https://github.com/dtolnay/rust-toolchain/blob/25dc93b901a87e864900a8aec6c12e9aa794c0c3/action.yml#L100-L108
+    - name: "Enable cargo sparse registry on stable"
+      run: |
+        # except on 1.66 and 1.67, on which it is unstable
+        if [[ ! -v CARGO_REGISTRIES_CRATES_IO_PROTOCOL ]]; then
+          if echo "${{steps.versions.outputs.rustc-version}}" | not grep -q '^rustc 1\.6[67]\.'; then
+            echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
+          fi
+        fi
+      shell: bash
+
     - name: "Setup Rust Caching"
       if: inputs.cache == 'true'
       uses: Swatinem/rust-cache@v2