Wire in downloading and installing LLVM from PPA

.github/workflows/test.yml

@@ -8,11 +8,21 @@ on:
       - 'releases/*'
 
 jobs:
-  ubuntu_2004:
-    name: "Ubuntu Linux 20.04"
+  ubuntu_2004_latestllvm:
+    name: "Ubuntu Linux 20.04 (latest LLVM)"
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: ./
         with:
           version: "master"
+          llvm-version: "latest"
+  ubuntu_1804_12llvm:
+    name: "Ubuntu Linux 18.04 (LLVM 12.y)"
+    runs-on: ubuntu-18.04
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          version: "master"
+          llvm-version: 12

README.md

@@ -6,14 +6,20 @@ Objective-C) using the [Clang](http://clang.llvm.org/) infrastructure and
 
 ## Overview
 
-:warning: **This action has been written with commands that target Ubuntu-based distributions!**
+⚠️ **CAUTION! This action has been written with commands that target Ubuntu-based distributions!**
+
+This single action composite script encompasses the following steps:
+
+  1. Obtain a package of the LLVM Clang suite's analysers, and CodeChecker.
+
 
 ## Action configuration
 
-### Installing versions
 
-| Variable     | Default                                                          | Description                                                |
-|--------------|------------------------------------------------------------------|
-| `repository` | [`Ericsson/CodeChecker`](http://github.com/Ericsson/CodeChecker) | The CodeChecker repository to check out and build          |
-| `version`    | `master`                                                         | The branch, tag, or commit SHA in the `repository` to use. |
+### Versions to install
 
+| Variable       | Default                                                          | Description                                                                                                                                                                                                    |
+|----------------|------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `repository`   | [`Ericsson/CodeChecker`](http://github.com/Ericsson/CodeChecker) | The CodeChecker repository to check out and build                                                                                                                                                              |
+| `version`      | `master`                                                         | The branch, tag, or commit SHA in the `repository` to use.                                                                                                                                                     |
+| `llvm-version` | `latest`                                                         | The major version of LLVM to install and use. LLVM is installed from [PPA](http://apt.llvm.org/). If `latest`, automatically gather the latest version. If `ignore`, don't install anything. (Not recommended) |

action.yml

@@ -1,6 +1,10 @@
 name: 'CodeChecker Static Analysis'
 author: 'Whisperity'
 description: 'Execute C/C++ static analysis of LLVM/Clang (Clang Static Analyzer and Clang-Tidy) driven via CodeChecker.'
+branding:
+  icon: 'tool'
+  color: 'blue'
+
 inputs:
   repository:
     description: 'The CodeChecker repository to check out and build from.'
@@ -10,6 +14,11 @@ inputs:
     description: 'The version of the CodeChecker suite to obtain and execute. Might be a Git commit SHA, a branch name, or a tag.'
     required: true
     default: 'master'
+  llvm-version:
+    description: 'The major version of LLVM to install and use. LLVM is installed from PPA. If "latest", automatically gather the latest version. If "ignore", do not install anything. (Not recommended)'
+    required: true
+    default: 'latest'
+
 runs:
   using: "composite"
   steps:
@@ -20,23 +29,29 @@ runs:
         path: CodeChecker
         ref: ${{ inputs.version }}
 
-
     - name: "Install dependencies of CodeChecker"
       shell: bash
       run: |
         sudo apt-get -qy update
-        sudo apt-get -y --no-install-recommends install \
-          build-essential \
-          curl \
-          gcc-multilib \
-          python3-dev \
-          python3-venv
-    - name: "Build and Package CodeChecker"
-      id: codechecker_build
+        ${{ github.action_path }}/src/apt-dependencies.sh
+
+    - name: "Install LLVM version"
+      id: llvm
+      if: ${{ inputs.llvm-version != 'ignore' }}
       env:
-        CODECHECKER_WILL_USE_WEB_API: false
+        CONFIGURED_LLVM_VERSION: ${{ inputs.llvm-version }}
       shell: bash
       run: |
+        ${{ github.action_path }}/src/get-llvm.sh
+        echo "::set-output name=REAL_VERSION::$(clang --version | head -n 1 | cut -d' ' -f4-)"
+
+    - name: "Build and Package CodeChecker"
+      id: codechecker
+      env:
+        CODECHECKER_WILL_USE_WEB_API: false  # TODO: Add support for this later.
+      shell: bash
+      run: |
+        set -ex
         if [[ "$CODECHECKER_WILL_USE_WEB_API" == "false" ]]; then
           # If the job is only running analysis, do not spend time with building the API stuff!
           echo "Building only 'analyzer' module..."
@@ -58,8 +73,8 @@ runs:
           echo "CodeChecker 'web' package not built."
         fi
 
-        echo "::set-output name=CODECHECKER_PATH::$(readlink -f ./build/CodeChecker/bin)"
-        echo "::set-output name=CODECHECKER_VERSION::$(./build/CodeChecker/bin/CodeChecker analyzer-version | grep 'Base package' | cut -d'|' -f 2 | tr -d ' ')"
-        echo "::set-output name=CODECHECKER_GITSEVEN::$(./build/CodeChecker/bin/CodeChecker analyzer-version | grep 'Git commit' | cut -d'|' -f 2 | cut -c 2-8)"
+        echo "::set-output name=PATH::$(readlink -f ./build/CodeChecker/bin)"
+        echo "::set-output name=VERSION::$(./build/CodeChecker/bin/CodeChecker analyzer-version | grep 'Base package' | cut -d'|' -f 2 | tr -d ' ')"
+        echo "::set-output name=GITSEVEN::$(./build/CodeChecker/bin/CodeChecker analyzer-version | grep 'Git commit' | cut -d'|' -f 2 | cut -c 2-8)"
 
         popd

src/apt-dependencies.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -ex
+
+sudo apt-get -y --no-install-recommends install \
+  build-essential \
+  curl \
+  gcc-multilib \
+  python3-dev \
+  python3-venv

src/get-llvm.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -ex
+
+export DISTRO_FANCYNAME="$(lsb_release -c | awk '{ print $2 }')"
+curl -sL http://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+
+if [[ "$CONFIGURED_LLVM_VERSION" == "latest" ]]; then
+  sudo add-apt-repository -y "deb http://apt.llvm.org/$DISTRO_FANCYNAME/ llvm-toolchain-$DISTRO_FANCYNAME main"
+  # Get the largest Clang package number available.
+  export LLVM_VER="$(apt-cache search --full 'clang-[[:digit:]]*$' | grep '^Package: clang' | cut -d ' ' -f 2 | sort -V | tail -n 1 | sed 's/clang-//')"
+else
+  sudo add-apt-repository -y "deb http://apt.llvm.org/$DISTRO_FANCYNAME/ llvm-toolchain-$DISTRO_FANCYNAME-$CONFIGURED_LLVM_VERSION main"
+  export LLVM_VER="$CONFIGURED_LLVM_VERSION"
+fi
+
+sudo apt-get -y --no-install-recommends install \
+  clang-$LLVM_VER      \
+  clang-tidy-$LLVM_VER
+sudo update-alternatives --install                   \
+  /usr/bin/clang clang /usr/bin/clang-$LLVM_VER 1000 \
+  --slave                                            \
+    /usr/bin/clang-tidy clang-tidy /usr/bin/clang-tidy-$LLVM_VER
+update-alternatives --query clang