Merge pull request #13 from actions-rust-lang/double-run

Not all version support the new sparse protocol. While old versions
ignore the value, 1.66 and other fail due to unstable features.

If such a version is detected, always downgrade to the git protocol.

This fixes running the action twice with different toolchains. Even if
the first install uses something which supports "sparse", the second run
can still downgrade it to "git".

Closes #12

.github/workflows/ci.yml

@@ -37,7 +37,7 @@ jobs:
           [toolchain]
           channel = "nightly-2022-09-10"
           components = [ "rustfmt", "rustc-dev" ]
-          targets = [ "wasm32-unknown-unknown", "thumbv2-none-eabi" ]
+          targets = [ "wasm32-unknown-unknown", "thumbv7m-none-eabi" ]
           profile = "minimal"
           EOF
         shell: bash

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [1.4.3] - 2023-02-21
+
+### Fixed
+
+* Executing the action twice for different toolchains now no longer fails around unstable features #12.
+    If multiple toolchains are installed, the "CARGO_REGISTRIES_CRATES_IO_PROTOCOL" can be downgraded to "git" if any of the installed toolchains require it.
+
+## [1.4.2] - 2023-02-15
+
+### Fixed
+
+* Tweak sparse registry version regex to better work with 1.68 nightly versions.
+* Fix command not found issue
+
 ## [1.4.1] - 2023-02-13
 
 ### Fixed

action.yml

@@ -85,6 +85,9 @@ runs:
         if [[ ! -v CARGO_UNSTABLE_SPARSE_REGISTRY ]]; then
           echo "CARGO_UNSTABLE_SPARSE_REGISTRY=true" >> $GITHUB_ENV
         fi
+        if [[ ! -v CARGO_REGISTRIES_CRATES_IO_PROTOCOL ]]; then
+          echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse" >> $GITHUB_ENV
+        fi
       shell: bash
     - name: "Install Rust Problem Matcher"
       run: echo "::add-matcher::${{ github.action_path }}/rust.json"
@@ -126,15 +129,15 @@ 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"
+    - name: "Downgrade registry access protocol when needed"
       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" >> $GITHUB_ENV
-          fi
+        # Not all versions support setting CARGO_REGISTRIES_CRATES_IO_PROTOCOL
+        # On versions 1.66, 1.67, and 1.68.0-nightly the value "sparse" is still unstable.
+        # https://github.com/dtolnay/rust-toolchain/pull/69#discussion_r1107268108
+        # If we detect an incompatible value, set it to "git" which is always supported.
+        if [[ "${{steps.versions.outputs.rustc-version}}" =~ ^rustc\ (1\.6[67]\.|1\.68\.0-nightly) && "${CARGO_REGISTRIES_CRATES_IO_PROTOCOL}" == "sparse" ]]; then
+          echo "Downgrade cargo registry protocol to git"
+          echo "CARGO_REGISTRIES_CRATES_IO_PROTOCOL=git" >> $GITHUB_ENV
         fi
       shell: bash