chore: detect the channel a PR wants to merge into

.github/workflows/main.yml

@@ -16,6 +16,20 @@ env:
   CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
 
 jobs:
+  # Determine which channel will be merged into.
+  channel:
+    runs-on: ubuntu-latest
+    outputs:
+      CHANNEL: ${{ steps.channel.outputs.CHANNEL }}
+    env:
+      BASE_SHA: ${{ github.event.pull_request.base.sha }}
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # fetch all branches
+      - id: channel
+        run: ci/which-channel.sh
+
   # Check Code style quickly by running `rustfmt` over all code
   rustfmt:
     runs-on: ubuntu-latest
@@ -43,6 +57,8 @@ jobs:
 
   test:
     runs-on: ${{ matrix.os }}
+    needs:
+    - channel
     env:
       CARGO_PROFILE_DEV_DEBUG: 1
       CARGO_PROFILE_TEST_DEBUG: 1
@@ -57,82 +73,106 @@ jobs:
           os: ubuntu-latest
           rust: stable
           other: i686-unknown-linux-gnu
+          if: always()
         - name: Linux x86_64 beta
           os: ubuntu-latest
           rust: beta
           other: i686-unknown-linux-gnu
+          if: ${{ needs.channel.outputs.CHANNEL == 'beta' || needs.channel.outputs.CHANNEL == 'nightly' }}
         - name: Linux x86_64 nightly
           os: ubuntu-latest
           rust: nightly
           other: i686-unknown-linux-gnu
+          if: ${{ needs.channel.outputs.CHANNEL == 'nightly' }}
         - name: macOS x86_64 stable
           os: macos-latest
           rust: stable
           other: x86_64-apple-ios
+          if: always()
         - name: macOS x86_64 nightly
           os: macos-latest
           rust: nightly
           other: x86_64-apple-ios
+          if: ${{ needs.channel.outputs.CHANNEL == 'nightly' }}
         - name: Windows x86_64 MSVC stable
           os: windows-latest
           rust: stable-msvc
           other: i686-pc-windows-msvc
+          if: always()
         - name: Windows x86_64 gnu nightly # runs out of space while trying to link the test suite
           os: windows-latest
           rust: nightly-gnu
           other: i686-pc-windows-gnu
+          if: ${{ needs.channel.outputs.CHANNEL == 'nightly' }}
     name: Tests ${{ matrix.name }}
     steps:
     - uses: actions/checkout@v3
+      if: matrix.if
     - name: Dump Environment
       run: ci/dump-environment.sh
+      if: matrix.if
     - name: Update Rustup (temporary workaround)
       run: rustup self update
       shell: bash
-      if: startsWith(matrix.os, 'windows')
+      if: matrix.if && startsWith(matrix.os, 'windows')
     - run: rustup update --no-self-update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
+      if: matrix.if
     - run: rustup target add ${{ matrix.other }}
+      if: matrix.if
     - run: rustup component add rustc-dev llvm-tools-preview rust-docs
-      if: startsWith(matrix.rust, 'nightly')
+      if: matrix.if && startsWith(matrix.rust, 'nightly')
     - run: sudo apt update -y && sudo apt install gcc-multilib libsecret-1-0 libsecret-1-dev -y
-      if: matrix.os == 'ubuntu-latest'
+      if: matrix.if && matrix.os == 'ubuntu-latest'
     - run: rustup component add rustfmt || echo "rustfmt not available"
+      if: matrix.if
     - name: Configure extra test environment
       run: echo CARGO_CONTAINER_TESTS=1 >> $GITHUB_ENV
-      if: matrix.os == 'ubuntu-latest'
-
+      if: matrix.if && matrix.os == 'ubuntu-latest'
     - run: cargo test
+      if: matrix.if
     - name: Clear intermediate test output
       run: ci/clean-test-output.sh
+      if: matrix.if
     - name: gitoxide tests (all git-related tests)
       run: cargo test git
       env:
         __CARGO_USE_GITOXIDE_INSTEAD_OF_GIT2: 1
+      if: matrix.if
       # The testsuite generates a huge amount of data, and fetch-smoke-test was
     # running out of disk space.
     - name: Clear test output
       run: ci/clean-test-output.sh
+      if: matrix.if
     - name: Check operability of rustc invocation with argfile
       env:
         __CARGO_TEST_FORCE_ARGFILE: 1
       run: |
         # This only tests `cargo fix` because fix-proxy-mode is one of the most
         # complicated subprocess management in Cargo.
         cargo test --test testsuite -- fix::
+      if: matrix.if
     - run: cargo test --manifest-path crates/cargo-test-support/Cargo.toml
       env:
         CARGO_TARGET_DIR: target
+      if: matrix.if
+    - run: cargo test -p cargo-test-support
+      if: matrix.if
     - run: cargo test -p cargo-platform
+      if: matrix.if
     - run: cargo test -p cargo-util
+      if: matrix.if
     - run: cargo test --manifest-path crates/home/Cargo.toml
+      if: matrix.if
     - run: cargo test --manifest-path crates/mdman/Cargo.toml
+      if: matrix.if
     - run: cargo build --manifest-path crates/credential/cargo-credential-1password/Cargo.toml
+      if: matrix.if
     - run: cargo build --manifest-path crates/credential/cargo-credential-gnome-secret/Cargo.toml
-      if: matrix.os == 'ubuntu-latest'
+      if: matrix.if && matrix.os == 'ubuntu-latest'
     - run: cargo build --manifest-path crates/credential/cargo-credential-macos-keychain/Cargo.toml
-      if: matrix.os == 'macos-latest'
+      if: matrix.if && matrix.os == 'macos-latest'
     - run: cargo build --manifest-path crates/credential/cargo-credential-wincred/Cargo.toml
-      if: matrix.os == 'windows-latest'
+      if: matrix.if && matrix.os == 'windows-latest'
     - name: Check benchmarks
       env:
         # Share the target dir to try to cache a few build-time deps.
@@ -142,12 +182,15 @@ jobs:
         # download all workspaces.
         cargo test --manifest-path benches/benchsuite/Cargo.toml --all-targets -- cargo
         cargo check --manifest-path benches/capture/Cargo.toml
+      if: matrix.if
     # The testsuite generates a huge amount of data, and fetch-smoke-test was
     # running out of disk space.
     - name: Clear benchmark output
       run: ci/clean-test-output.sh
+      if: matrix.if
     - name: Fetch smoke test
       run: ci/fetch-smoke-test.sh
+      if: matrix.if
 
   resolver:
     runs-on: ubuntu-latest
@@ -170,6 +213,9 @@ jobs:
 
   build_std:
     runs-on: ubuntu-latest
+    needs:
+    - channel
+    if: ${{ needs.channel.outputs.CHANNEL == 'nightly' }}
     steps:
     - uses: actions/checkout@v3
     - run: rustup update nightly && rustup default nightly
@@ -180,8 +226,19 @@ jobs:
         CARGO_RUN_BUILD_STD_TESTS: 1
   docs:
     runs-on: ubuntu-latest
+    needs:
+    - channel
     steps:
     - uses: actions/checkout@v3
+    - name: Set branch for rustc linkchecker
+      id: branch
+      run: |
+        BRANCH=${{ needs.channel.outputs.CHANNEL }}
+        if [ "$BRANCH" = "nightly" ]
+        then
+            BRANCH=master
+        fi
+        echo "BRANCH=$BRANCH" >> "$GITHUB_OUTPUT"
     - run: rustup update nightly && rustup default nightly
     - run: rustup update stable
     - run: rustup component add rust-docs
@@ -196,10 +253,12 @@ jobs:
       env:
         RUSTDOCFLAGS: -D warnings
     - run: cd src/doc && mdbook build --dest-dir ../../target/doc
-    - run: |
+    - name: Run linkchecker.sh
+      run: |
+        BRANCH=${{ steps.branch.outputs.BRANCH }}
         cd src/doc
         curl -sSLo linkcheck.sh \
-          https://raw.githubusercontent.com/rust-lang/rust/master/src/tools/linkchecker/linkcheck.sh
+          "https://raw.githubusercontent.com/rust-lang/rust/$BRANCH/src/tools/linkchecker/linkcheck.sh"
         sh linkcheck.sh --all cargo
 
   success:

ci/which-channel.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+# This script outputs the channel where a CI workflow wants to merge into.
+#
+# Inputs:
+#     BASE_SHA    The commit SHA of the branch where the PR wants to merge into.
+#
+# GitHub Action Outputs:
+#     CHANNEL     Target channel where the PR wants to merge into.
+
+set -euo pipefail
+
+# When `BASE_SHA` is missing, we assume it is from bors merge commit,
+# so hope `HEAD~` to find the previous commit on master branch.
+base_sha=$(git rev-parse "${BASE_SHA:-HEAD~1}")
+
+# Default to nightly channel
+CHANNEL="nightly"
+
+# Get symbolic names for the base_sha.
+# We only care about `rust-1.y.z` branches
+ref=$(git name-rev --name-only --refs="origin/rust-1.*" $base_sha)
+
+# Remove the patch version `.0` and keep only `1.y`,
+# so that rustup can install the correct patched toolchain
+if [[ "$ref" =~ ^origin/rust-(.*).0$ ]]
+then
+    rustup update
+    rustup toolchain install stable beta
+    version="${BASH_REMATCH[1]}"
+    beta="$(rustc +beta -V)"
+    stable="$(rustc +stable -V)"
+
+    if [[ "$beta" == "rustc ${version}"* ]]
+    then
+        CHANNEL="beta"
+    fi
+
+    if [[ "$stable" = "rustc ${version}"* ]]
+    then
+        CHANNEL="stable"
+    fi
+fi
+
+echo "Base sha:     $base_sha"
+echo "Possible ref: $ref"
+echo "Channel:      $CHANNEL"
+
+echo "CHANNEL=$CHANNEL" >> "$GITHUB_OUTPUT"