Update travis build to new container infrastructure (w/o sudo)

.travis.yml

@@ -5,12 +5,25 @@ compiler:
 env:
   - CXX11=1
   - CXX11=0
-before_install: ./util/travis/before_install.sh
+sudo: false
+addons:
+  apt:
+    sources:
+      - llvm-toolchain-precise-3.8
+      - ubuntu-toolchain-r-test
+    packages:
+      - cmake
+      - libgd2-noxpm-dev
+      - libsqlite3-dev
+      - p7zip
+      - g++-6
+      - clang-3.8
+before_install:
+  - # Nothing ever works correctly with precise, use a custom libleveldb build
+  - wget http://minetest.kitsunemimi.pw/libleveldb-1.18-ubuntu12.04.7z
+  - 7zr x -olibleveldb libleveldb-1.18-ubuntu12.04.7z
 script: ./util/travis/script.sh
 notifications:
   email: false
 matrix:
   fast_finish: true
-  exclude:
-    - env: CXX11=1
-      compiler: gcc

util/travis/before_install.sh

@@ -1,20 +0,0 @@
-#!/bin/bash -e
-
-
-if [ $CC = "clang" ]; then
-	export PATH="/usr/bin/:$PATH"
-	sudo sh -c 'echo "deb http://ppa.launchpad.net/eudoxos/llvm-3.1/ubuntu precise main" >> /etc/apt/sources.list'
-	sudo apt-key adv --keyserver pool.sks-keyservers.net --recv-keys 92DE8183
-	sudo apt-get update
-	sudo apt-get install llvm-3.1
-	sudo apt-get install clang
-fi
-
-sudo apt-get update
-sudo apt-get install cmake libgd2-noxpm-dev libsqlite3-dev \
-	p7zip-full
-
-# I love how nothing ever works correctly with precise
-wget http://minetest.kitsunemimi.pw/libleveldb-1.18-ubuntu12.04.7z
-sudo 7z x -o/usr libleveldb-1.18-ubuntu12.04.7z
-

util/travis/script.sh

@@ -1,6 +1,17 @@
 #!/bin/bash -e
 
+CXX=g++-6
+[ $CC == "clang" ] && CXX=clang-3.8
+export CXX
+
+
 mkdir -p travisbuild
 cd travisbuild
-cmake -DENABLE_LEVELDB=1 -DUSE_CXX11=$CXX11 ..
+
+cmake \
+	-DENABLE_LEVELDB=1 -DUSE_CXX11=$CXX11 \
+	-DLEVELDB_LIBRARY=../libleveldb/lib/libleveldb.so \
+	-DLEVELDB_INCLUDE_DIR=../libleveldb/include \
+	..
+
 make -j2