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action.yml

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+name: "Build Rust Projects with Cross"
+author: "Dave Rolsky <autarch@urth.org>"
+branding:
+  icon: home
+  color: gray-dark
+description: |
+  This action lets you easily install and use cross
+  (https://github.com/cross-rs/cross) to compile your Rust projects. It will
+  compile with cargo if the host and target platforms allow, so it's a drop-in
+  replacement for running `cargo build` in your Actions.
+inputs:
+  target:
+    description: The target platform
+    required: true
+  GITHUB_TOKEN:
+    description: |
+      A GitHub token, available in the secrets.GITHUB_TOKEN context variable.
+    default: ${{ github.token }}
+  args:
+    description: |
+      The arguments to be passed to cross or cargo when building, as a
+      space-separated string.
+    default: ""
+  strip:
+    description: Strip the compiled binary
+    default: false
+runs:
+  using: composite
+  steps:
+    - name: Add this action's path to PATH
+      shell: bash
+      run: echo "${{ github.action_path }}" >> $GITHUB_PATH
+    - name: Determine whether we need to cross-compile
+      id: determine-cross-compile
+      shell: bash
+      run: set-cross-compile.sh ${{ inputs.target }}
+    - name: Install toolchain if not cross-compiling
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ matrix.platform.target }}
+      if: ${{ steps.determine-cross-compile.outputs.needs-cross == 'false' }}
+    - name: Install cross if cross-compiling (*nix)
+      shell: bash
+      run: install-cross-nix.sh
+      if: ${{ steps.determine-cross-compile.outputs.needs-cross == 'true' && runner.os != 'Windows' }}
+      env:
+        GITHUB_TOKEN: ${{ inputs.GITHUB_TOKEN }}
+    - name: Install cross if cross-compiling (Windows)
+      shell: powershell
+      run: install-cross-windows.ps1
+      if: ${{ steps.determine-cross-compile.outputs.needs-cross == 'true' && runner.os == 'Windows' }}
+      env:
+        GITHUB_TOKEN: ${{ inputs.GITHUB_TOKEN }}
+    - name: Set build command
+      id: set-build-command
+      shell: bash
+      run: set-build-command.sh
+    - name: Build binary (*nix)
+      shell: bash
+      run: |
+        ${{ steps.set-build-command.outputs.build-command }} build ${{ inputs.args }} --target ${{ inputs.target }}
+      if: ${{ runner.os != 'Windows' }}
+    # We want to run in Powershell on Windows to make sure we compile in a
+    # native Windows environment. Some things won't compile properly under
+    # msys, notably OpenSSL, which is compiled locally when using the
+    # `openssl` crate with the `vendored` feature.
+    - name: Build binary (Windows)
+      shell: powershell
+      run: |
+        & ${{ steps.set-build-command.outputs.build-command }} build ${{ inputs.args }} --target ${{ inputs.target }}
+      if: ${{ runner.os == 'Windows' }}
+    - name: Strip binary
+      shell: bash
+      run: |
+        strip target/${{ matrix.platform.target }}/release/${{ matrix.platform.bin }}
+      # strip doesn't work with cross-arch binaries on Linux or Windows.
+      if: ${{ inputs.strip == 'true' && steps.determine-cross-compile.outputs.needs-cross == 'false' && inputs.target != 'aarch64-pc-windows-msvc' }}

install-cross-nix.sh

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+set -e
+set -x
+
+cd "$RUNNER_TEMP"
+export TARGET=.
+curl --silent --location \
+     https://raw.githubusercontent.com/houseabsolute/ubi/master/bootstrap/bootstrap-ubi.sh |
+    sh
+./ubi --project cross-rs/cross --matching musl --in .

install-cross-windows.ps1

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+cd $Env:RUNNER_TEMP
+Invoke-WebRequest -URI 'https://raw.githubusercontent.com/houseabsolute/ubi/master/bootstrap/bootstrap-ubi.ps1' -UseBasicParsing | Invoke-Expression
+.\ubi --project cross-rs/cross --in .
+

set-build-command.sh

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+set -e
+set -x
+
+if [ -f "$RUNNER_TEMP/cross" ]; then
+    echo "build-command=$RUNNER_TEMP/cross" >> $GITHUB_OUTPUT
+else
+    echo "build-command=cargo" >> $GITHUB_OUTPUT
+fi

set-cross-compile.sh

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+set -e
+set -x
+
+TARGET="$1"
+
+# On macOS and Windows, we can cross-compile to all possible targets without
+# using cross.
+if uname -a | grep --quiet --extended-regexp -i "darwin|msys|windows"; then
+    echo "needs-cross=false" >> $GITHUB_OUTPUT
+    exit 0
+fi
+
+if echo "$TARGET" | grep --quiet --extended-regexp -i '(x86_64|586|686).+linux-(gnu|musl)'; then
+    echo "needs-cross=false" >> $GITHUB_OUTPUT
+    exit 0
+fi
+
+echo "needs-cross=true" >> $GITHUB_OUTPUT