Initial Commit

.github/dependabot.yaml

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+version: 2
+updates:
+- package-ecosystem: github-actions
+  directory: "/"
+  schedule:
+    interval: "daily"
+  reviewers:
+  - slashmo

.github/workflows/ci.yaml

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+name: CI
+on:
+  push:
+
+jobs:
+  ci:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
+        swift: [5.5, swift-DEVELOPMENT-SNAPSHOT-2021-11-12-a]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Install Swift
+      uses: ./
+      with:
+        version: ${{ matrix.swift }}
+
+    - name: Print Swift Version
+      run: swift --version

.gitignore

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+.DS_Store

LICENSE.txt

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+MIT License
+
+Copyright (c) 2021 Moritz Lang
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# install-swift
+
+This action allows installing Swift toolchains, with support for both release and development versions.
+
+## Usage
+
+### Inputs
+
+- `version` - The Swift version you want to install. This may either be a release version like `5.5`, or a development
+snapshot like `swift-DEVELOPMENT-SNAPSHOT-2021-11-12-a`.
+
+### Example
+
+```yaml
+- name: Install Swift
+  uses: slashmo/[email protected]
+  with:
+    version: 5.5
+```
+
+After adding this step, all following steps in this job will automatically use the newly installed Swift version:
+
+```yaml
+- name: Run Tests
+  run: swift test # <-- uses Swift 5.5
+```
+
+### Multiple Swift Versions
+
+In case you want to run your GitHub Actions workflow using different versions of Swift, define a
+[GitHub Action's matrix](https://docs.github.com/en/actions/learn-github-actions/workflow-syntax-for-github-actions#jobsjob_idstrategymatrix)
+to spawn multiple instances of the same job:
+
+```yaml
+jobs:
+  test:
+    name: Run Tests
+    strategy:
+      matrix:
+        swift: [5.5, swift-DEVELOPMENT-SNAPSHOT-2021-11-12-a]
+        ubuntu: [ubuntu-18.04, ubuntu-20.04]
+        fail-fast: false
+    runs-on: ${{ matrix.ubuntu }}
+    steps:
+    - name: Install Swift
+      uses: slashmo/[email protected]
+      with:
+        version: ${{ matrix.swift }}
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Run Tests
+      run: swift test
+```
+
+The action will automatically detect the Ubuntu version and install the correct toolchain.
+
+### Caching
+
+`install-swift` automatically caches toolchains based on the [version input](#inputs) and the detected Ubuntu version.

action.yaml

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+name: 'Install Swift'
+description: 'Install the given Swift version.'
+
+inputs:
+  version:
+    description: 'The Swift version to install.'
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+  - name: Determine Ubuntu Version
+    run: |
+      UBUNTU_VERSION=$(lsb_release -rs)
+
+      if [ $UBUNTU_VERSION != "18.04" ] && [ $UBUNTU_VERSION != "20.04" ]; then
+          echo "No Swift Toolchain available for Ubuntu version '$UBUNTU_VERSION'."
+          echo "Visit https://swift.org/download for more information."
+          exit 1;
+      fi
+
+      echo "UBUNTU_VERSION=$UBUNTU_VERSION" >> $GITHUB_ENV
+    shell: bash
+
+  - name: Cache Swift Toolchain
+    id: swift-toolchain-cache
+    uses: actions/cache@v2
+    with:
+      path: /usr/share/swift-toolchain
+      key: ubuntu-${{ env.UBUNTU_VERSION }}-${{ inputs.version }}
+
+  - name: Install Swift Toolchain
+    run: SWIFT_VERSION=${{ inputs.version }} $GITHUB_ACTION_PATH/install-swift.sh
+    shell: bash
+
+  - name: Print Swift Version
+    run: swift --version
+    shell: bash
+
+branding:
+  icon: 'briefcase'
+  color: 'orange'

install-swift.sh

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+#!/bin/bash
+
+if [[ $SWIFT_VERSION == swift-DEVELOPMENT-SNAPSHOT* ]]; then
+    TOOLCHAIN_BASE_URL="https://download.swift.org/development/ubuntu${UBUNTU_VERSION//[.]/}/$SWIFT_VERSION"
+    TOOLCHAIN_PATH="$SWIFT_VERSION-ubuntu$UBUNTU_VERSION"
+else
+    TOOLCHAIN_BASE_URL="https://download.swift.org/swift-$SWIFT_VERSION-release/ubuntu${UBUNTU_VERSION//[.]/}/swift-$SWIFT_VERSION-RELEASE"
+    TOOLCHAIN_PATH="swift-$SWIFT_VERSION-RELEASE-ubuntu$UBUNTU_VERSION"
+fi
+
+TOOLCHAIN_TAR="$TOOLCHAIN_PATH.tar.gz"
+TOOLCHAIN_SIG="$TOOLCHAIN_TAR.sig"
+TOOLCHAIN_TAR_URL="$TOOLCHAIN_BASE_URL/$TOOLCHAIN_TAR"
+TOOLCHAIN_SIG_URL="$TOOLCHAIN_BASE_URL/$TOOLCHAIN_SIG"
+
+echo "Installing system dependencies 📦"
+sudo apt-get install \
+binutils git gnupg2 libc6-dev libcurl4 libedit2 libgcc-9-dev libpython2.7 libsqlite3-0 libstdc++-9-dev libxml2 \ 
+libz3-dev pkg-config tzdata uuid-dev zlib1g-dev
+
+if [ -d "/usr/share/swift-toolchain" ]; then
+    echo "Toolchain already exists, skipping download ✅"
+else
+    echo "Reading toolchain version from .swift-version 📄"
+    echo "Detected Swift toolchain version '$(cat .swift-version)' 📄"
+
+    echo "Downloading Swift toolchain ☁️"
+    wget $TOOLCHAIN_TAR_URL
+
+    echo "Verifying Swift toolchain 🔑"
+    wget -q -O - https://swift.org/keys/all-keys.asc | gpg --import -
+    wget $TOOLCHAIN_SIG_URL
+    gpg --verify $TOOLCHAIN_SIG
+
+    echo "Installing Swift toolchain 💻"
+    tar xzf $TOOLCHAIN_TAR
+
+    mv $TOOLCHAIN_PATH /usr/share/swift-toolchain
+    echo "Successfully installed Swift toolchain 🎉"
+fi
+
+export PATH=/usr/share/swift-toolchain/usr/bin:${PATH} 
+echo "PATH=$PATH" >> $GITHUB_ENV