travis: Use Docker for clang-format target

.travis.yml

@@ -3,15 +3,11 @@ matrix:
   include:
     - os: linux
       env: NAME="clang-format"
+      sudo: required
       dist: trusty
-      addons:
-        apt:
-          sources:
-            - llvm-toolchain-trusty-6.0
-            - ubuntu-toolchain-r-test
-          packages:
-            - clang-format-6.0
-      script: "./.travis/clang-format/script.sh"
+      services: docker
+      install: "./.travis/clang-format/deps.sh"
+      script: "./.travis/clang-format/build.sh"
     - os: linux
       env: NAME="linux build"
       sudo: required

.travis/clang-format/build.sh

@@ -0,0 +1,3 @@
+#!/bin/bash -ex
+mkdir -p "$HOME/.ccache"
+docker run --env-file .travis/common/travis-ci.env -v $(pwd):/citra -v "$HOME/.ccache":/root/.ccache citraemu/build-environments:linux-clang-format /bin/bash -ex /citra/.travis/clang-format/docker.sh

.travis/clang-format/deps.sh

@@ -0,0 +1,3 @@
+#!/bin/sh -ex
+
+docker pull citraemu/build-environments:linux-clang-format

.travis/clang-format/docker.sh

@@ -0,0 +1,5 @@
+#!/bin/bash -ex
+
+# Run clang-format
+cd /citra
+./.travis/clang-format/script.sh

.travis/common/travis-ci.env

@@ -6,6 +6,8 @@ TRAVIS_BRANCH
 TRAVIS_BUILD_ID
 TRAVIS_BUILD_NUMBER
 TRAVIS_COMMIT
+TRAVIS_COMMIT_RANGE
+TRAVIS_EVENT_TYPE
 TRAVIS_JOB_ID
 TRAVIS_JOB_NUMBER
 TRAVIS_REPO_SLUG