Travis: Refactor CI files, use container infrastructure.

 * Split build steps to utilize the Travis build lifecycle.
 * Move shell code from `.travis.yml` into Bash files in `.ci/`,
   one file for each step of the Travis build lifecycle.
 * Use configuration variables in `.travis.yml` to change
   build behavior (e.g. build 32-bit with `BUILD_32BIT=ON`).
 * Keep all configuration in environment variables in
   `.travis.yml`. In scripts, concatenate environment variables
   according to configuration to change to different behavior.
 * Add GCC 5 builds for Linux.
 * Use Travis's caching feature [1] for third-party dependencies
   and pip packages.
 * Allow failures MSan, as the errors it reports have to be
   fixed first.

Valgrind is still disabled, but can be enabled by setting
`env: VALGRIND=ON` for a job in `.travis.yml`.

[1] http://docs.travis-ci.com/user/caching

15 files changed, 302 insertions, 247 deletions

diff --git a/.ci/after_success.sh b/.ci/after_success.sh
new file mode 100755
index 0000000000..bc75e06b85
--- /dev/null
+++ b/.ci/after_success.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n "${CI_TARGET}" ]]; then
+  exit
+fi
+
+coveralls --encoding iso-8859-1 || echo 'coveralls upload failed.'
diff --git a/.ci/before_cache.sh b/.ci/before_cache.sh
new file mode 100755
index 0000000000..8925da92f3
--- /dev/null
+++ b/.ci/before_cache.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ "${TRAVIS_OS_NAME}" != linux ]]; then
+  # Caches are only enabled for Travis's Linux container infrastructure,
+  # but this script is still executed on OS X.
+  exit
+fi
+
+# Don't cache pip's log and selfcheck.
+rm -rf "${HOME}/.cache/pip/log"
+rm -f "${HOME}/.cache/pip/selfcheck.json"
+
+# Update the third-party dependency cache only if the build was successful.
+if [[ -f "${SUCCESS_MARKER}" ]]; then
+  if [[ ! -f "${CACHE_MARKER}" ]] || [[ "${BUILD_NVIM_DEPS}" == true ]]; then
+    echo "Updating third-party dependency cache."
+    rm -rf "${HOME}/.cache/nvim-deps"
+    mv -T "${DEPS_INSTALL_PREFIX}" "${HOME}/.cache/nvim-deps"
+    touch "${CACHE_MARKER}"
+  fi
+fi
diff --git a/.ci/before_install.sh b/.ci/before_install.sh
new file mode 100755
index 0000000000..e70654c9be
--- /dev/null
+++ b/.ci/before_install.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n "${CI_TARGET}" ]]; then
+  exit
+fi
+
+if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
+  brew update
+fi
+pip install --user --upgrade pip
diff --git a/.ci/before_script.sh b/.ci/before_script.sh
new file mode 100755
index 0000000000..c1c2659562
--- /dev/null
+++ b/.ci/before_script.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n "${CI_TARGET}" ]]; then
+  exit
+fi
+
+CI_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "${CI_DIR}/common/build.sh"
+
+if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
+  # Adds user to a dummy group.
+  # That allows to test changing the group of the file by `os_fchown`.
+  sudo dscl . -create /Groups/chown_test
+  sudo dscl . -append /Groups/chown_test GroupMembership "${USER}"
+else
+  # Compile dependencies.
+  build_deps
+fi
+
+rm -rf "${LOG_DIR}"
+mkdir -p "${LOG_DIR}"
diff --git a/.ci/clang.sh b/.ci/clang.sh
deleted file mode 100644
index 70ed7d4764..0000000000
--- a/.ci/clang.sh
+++ /dev/null
@@ -1,73 +0,0 @@
-. "$CI_SCRIPTS/common.sh"
-
-sudo pip install cpp-coveralls
-
-# Use custom Clang and enable sanitizers on Linux.
-if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-	if [ -z "$CLANG_SANITIZER" ]; then
-		echo "CLANG_SANITIZER not set."
-		exit 1
-	fi
-
-	clang_version=3.6
-	echo "Installing Clang $clang_version..."
-
-	sudo add-apt-repository "deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu precise main"
-	sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BA9EF27F
-
-	sudo add-apt-repository "deb http://llvm.org/apt/precise/ llvm-toolchain-precise-$clang_version main"
-	wget -q -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add -
-
-	sudo apt-get update -qq
-	sudo apt-get install -y -q clang-$clang_version
-
-	export CC=/usr/bin/clang-$clang_version
-	symbolizer=/usr/bin/llvm-symbolizer-$clang_version
-	export ASAN_SYMBOLIZER_PATH=$symbolizer
-	export MSAN_SYMBOLIZER_PATH=$symbolizer
-	export ASAN_OPTIONS="detect_leaks=1:log_path=$tmpdir/asan"
-	export TSAN_OPTIONS="external_symbolizer_path=$symbolizer log_path=$tmpdir/tsan"
-	export UBSAN_OPTIONS="log_path=$tmpdir/ubsan" # not sure if this works
-	CMAKE_EXTRA_FLAGS="-DTRAVIS_CI_BUILD=ON \
-		-DUSE_GCOV=ON \
-		-DBUSTED_OUTPUT_TYPE=plainTerminal \
-		-DCLANG_${CLANG_SANITIZER}=ON"
-else
-	CMAKE_EXTRA_FLAGS="-DTRAVIS_CI_BUILD=ON \
-		-DUSE_GCOV=ON \
-		-DBUSTED_OUTPUT_TYPE=plainTerminal"
-fi
-
-setup_deps x64
-
-# Build and output version info.
-$MAKE_CMD CMAKE_EXTRA_FLAGS="$CMAKE_EXTRA_FLAGS" nvim
-build/bin/nvim --version
-
-# Run unittests.
-make unittest
-
-# Run functional tests.
-# FIXME (fwalch): Disabled for MSAN because of SIGPIPE error.
-if [ "$TRAVIS_OS_NAME" = linux ] && ! [ "$CLANG_SANITIZER" = MSAN ]; then
-	if ! $MAKE_CMD test; then
-		asan_check "$tmpdir"
-		exit 1
-	fi
-	asan_check "$tmpdir"
-fi
-
-# Run legacy tests.
-if ! $MAKE_CMD oldtest; then
-	reset
-	asan_check "$tmpdir"
-	exit 1
-fi
-asan_check "$tmpdir"
-
-coveralls --encoding iso-8859-1 || echo 'coveralls upload failed.'
-
-# Test if correctly installed.
-sudo -E $MAKE_CMD install
-/usr/local/bin/nvim --version
-/usr/local/bin/nvim -e -c "quit"
diff --git a/.ci/clint.sh b/.ci/clint.sh
deleted file mode 100755
index 53769a2552..0000000000
--- a/.ci/clint.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-
-make lint
diff --git a/.ci/common.sh b/.ci/common.sh
deleted file mode 100644
index 4894c0d5ad..0000000000
--- a/.ci/common.sh
+++ /dev/null
@@ -1,74 +0,0 @@
-set -eu
-
-valgrind_check() {
-	check_logs "$1" "valgrind-*"
-}
-
-asan_check() {
-	check_logs "$1" "*san.*"
-}
-
-check_logs() {
-	local err=""
-	check_core_dumps
-	# Iterate through each log to remove an useless warning
-	for log in $(find "$1" -type f -name "$2"); do
-		sed -i "$log" \
-			-e '/Warning: noted but unhandled ioctl/d' \
-			-e '/could cause spurious value errors to appear/d' \
-			-e '/See README_MISSING_SYSCALL_OR_IOCTL for guidance/d'
-	done
-	# Now do it again, but only consider files with size > 0
-	for log in $(find "$1" -type f -name "$2" -size +0); do
-		cat "$log"
-		err=1
-	done
-	if [ -n "$err" ]; then
-		echo "Runtime errors detected"
-		exit 1
-	fi
-}
-
-check_core_dumps() {
-	sleep 2
-
-	if [ "$TRAVIS_OS_NAME" = "osx" ]; then
-		cores="$(find /cores/ -type f -print)"
-		dbg="lldb -Q -o bt -f build/bin/nvim -c"
-	else
-		# TODO(fwalch): Will trigger if a file named core.* exists outside of .deps.
-		cores="$(find ./ -type f -not -path '*.deps*' -name 'core.*' -print)"
-		dbg="gdb -n -batch -ex bt build/bin/nvim"
-	fi
-
-	if [ -z "$cores" ]; then
-		return
-	fi
-	for c in $cores; do
-		$dbg $c
-	done
-	exit 1
-}
-
-setup_deps() {
-	sudo pip install --upgrade pip
-	sudo pip install neovim
-
-	# For pip3
-	# https://github.com/travis-ci/travis-ci/issues/1528
-	# sudo apt-get install -q python3.3-dev
-	# curl -Ss http://python-distribute.org/distribute_setup.py | sudo python3
-	# curl -Ss https://raw.github.com/pypa/pip/master/contrib/get-pip.py | sudo python3
-	# sudo pip3.3 install neovim
-
-	if [ "$BUILD_NVIM_DEPS" != "true" ]; then
-		eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) deps-${1}"
-	elif [ "$TRAVIS_OS_NAME" = "linux" ]; then
-		sudo apt-get install libtool
-	fi
-}
-
-tmpdir="$(pwd)/tmp"
-rm -rf "$tmpdir"
-mkdir -p "$tmpdir"
-suppressions="$(pwd)/.valgrind.supp"
diff --git a/.ci/common/build.sh b/.ci/common/build.sh
new file mode 100644
index 0000000000..0140be3637
--- /dev/null
+++ b/.ci/common/build.sh
@@ -0,0 +1,79 @@
+build_deps() {
+  if [[ "${BUILD_32BIT}" == ON ]]; then
+    if [[ "${BUILD_MINGW}" == ON ]]; then
+      >&2 echo "32-bit MinGW builds not supported."
+      exit 1
+    fi
+
+    DEPS_CMAKE_FLAGS="${DEPS_CMAKE_FLAGS} ${CMAKE_FLAGS_32BIT}"
+  fi
+  if [[ "${BUILD_MINGW}" == ON ]]; then
+    DEPS_CMAKE_FLAGS="${DEPS_CMAKE_FLAGS} ${CMAKE_FLAGS_MINGW}"
+  fi
+
+  rm -rf "${DEPS_INSTALL_PREFIX}"
+
+  # If there is a valid cache and we're not forced to recompile,
+  # use cached third-party dependencies.
+  if [[ -f "${CACHE_MARKER}" ]] && [[ "${BUILD_NVIM_DEPS}" != true ]]; then
+    echo "Using third-party dependencies from Travis's cache (last updated: $(stat -c '%y' "${CACHE_MARKER}"))."
+
+    mkdir -p "$(dirname "${DEPS_INSTALL_PREFIX}")"
+    ln -Ts "${HOME}/.cache/nvim-deps" "${DEPS_INSTALL_PREFIX}"
+    return
+  fi
+
+  mkdir -p "${DEPS_BUILD_DIR}"
+  cd "${DEPS_BUILD_DIR}"
+  echo "Configuring with '${DEPS_CMAKE_FLAGS}'."
+  cmake ${DEPS_CMAKE_FLAGS} "${TRAVIS_BUILD_DIR}/third-party/"
+
+  if ! ${MAKE_CMD}; then
+    exit 1
+  fi
+
+  cd "${TRAVIS_BUILD_DIR}"
+}
+
+build_nvim() {
+  if [[ -n "${CLANG_SANITIZER}" ]]; then
+    CMAKE_FLAGS="${CMAKE_FLAGS} -DCLANG_${CLANG_SANITIZER}=ON"
+  fi
+  if [[ "${BUILD_32BIT}" == ON ]]; then
+    if [[ "${BUILD_MINGW}" == ON ]]; then
+      >&2 echo "32-bit MinGW builds not supported."
+      exit 1
+    fi
+
+    CMAKE_FLAGS="${CMAKE_FLAGS} ${CMAKE_FLAGS_32BIT}"
+  fi
+  if [[ "${BUILD_MINGW}" == ON ]]; then
+    CMAKE_FLAGS="${CMAKE_FLAGS} ${CMAKE_FLAGS_MINGW}"
+  fi
+
+  mkdir -p "${BUILD_DIR}"
+  cd "${BUILD_DIR}"
+  echo "Configuring with '${CMAKE_FLAGS}'."
+  cmake ${CMAKE_FLAGS} "${TRAVIS_BUILD_DIR}"
+
+  echo "Building nvim."
+  if ! ${MAKE_CMD} nvim; then
+    exit 1
+  fi
+
+  echo "Building libnvim."
+  if ! ${MAKE_CMD} libnvim; then
+    exit 1
+  fi
+
+  echo "Building nvim-test."
+  if ! ${MAKE_CMD} nvim-test; then
+    exit 1
+  fi
+
+  # Invoke nvim to trigger *San early.
+  bin/nvim --version
+  bin/nvim -u NONE -e -c ':qall'
+
+  cd "${TRAVIS_BUILD_DIR}"
+}
diff --git a/.ci/common/test.sh b/.ci/common/test.sh
new file mode 100644
index 0000000000..2eaaf0b2b1
--- /dev/null
+++ b/.ci/common/test.sh
@@ -0,0 +1,85 @@
+check_core_dumps() {
+  sleep 2
+
+  if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
+    local cores="$(find /cores/ -type f -print)"
+    local dbg_cmd="lldb -Q -o bt -f ${BUILD_DIR}/bin/nvim -c"
+  else
+    # FIXME (fwalch): Will trigger if a file named core.* exists outside of $DEPS_BUILD_DIR.
+    local cores="$(find ./ -type f -not -path "*${DEPS_BUILD_DIR}*" -name 'core.*' -print)"
+    local dbg_cmd="gdb -n -batch -ex bt ${BUILD_DIR}/bin/nvim"
+  fi
+
+  if [ -z "${cores}" ]; then
+    return
+  fi
+  for core in $cores; do
+    ${dbg_cmd} "${core}"
+  done
+  exit 1
+}
+
+check_logs() {
+  # Iterate through each log to remove an useless warning.
+  for log in $(find "${1}" -type f -name "${2}"); do
+    sed -i "${log}" \
+      -e '/Warning: noted but unhandled ioctl/d' \
+      -e '/could cause spurious value errors to appear/d' \
+      -e '/See README_MISSING_SYSCALL_OR_IOCTL for guidance/d'
+  done
+
+  # Now do it again, but only consider files with size > 0.
+  local err=""
+  for log in $(find "${1}" -type f -name "${2}" -size +0); do
+    cat "${log}"
+    err=1
+  done
+  if [[ -n "${err}" ]]; then
+    echo "Runtime errors detected."
+    exit 1
+  fi
+}
+
+valgrind_check() {
+  check_logs "${1}" "valgrind-*"
+}
+
+asan_check() {
+  check_logs "${1}" "*san.*"
+}
+
+run_unittests() {
+  ${MAKE_CMD} -C "${BUILD_DIR}" unittest
+}
+
+run_functionaltests() {
+  if ! ${MAKE_CMD} -C "${BUILD_DIR}" functionaltest; then
+    asan_check "${LOG_DIR}"
+    valgrind_check "${LOG_DIR}"
+    exit 1
+  fi
+  asan_check "${LOG_DIR}"
+  valgrind_check "${LOG_DIR}"
+}
+
+run_oldtests() {
+  if ! make -C "${TRAVIS_BUILD_DIR}/src/nvim/testdir"; then
+    reset
+    asan_check "${LOG_DIR}"
+    valgrind_check "${LOG_DIR}"
+    exit 1
+  fi
+  asan_check "${LOG_DIR}"
+  valgrind_check "${LOG_DIR}"
+}
+
+install_nvim() {
+  ${MAKE_CMD} -C "${BUILD_DIR}" install
+
+  "${INSTALL_PREFIX}/bin/nvim" --version
+  "${INSTALL_PREFIX}/bin/nvim" -u NONE -e -c ':help' -c ':qall' || {
+    echo "Running ':help' in the installed nvim failed."
+    echo "Maybe the helptags have not been generated properly."
+    exit 1
+  }
+}
diff --git a/.ci/gcc-32.sh b/.ci/gcc-32.sh
deleted file mode 100644
index f1b2627fee..0000000000
--- a/.ci/gcc-32.sh
+++ /dev/null
@@ -1,37 +0,0 @@
-. "$CI_SCRIPTS/common.sh"
-
-sudo apt-get install gcc-multilib g++-multilib
-
-setup_deps x86
-
-CMAKE_EXTRA_FLAGS="-DTRAVIS_CI_BUILD=ON \
-	-DCMAKE_SYSTEM_PROCESSOR=i386 \
-	-DCMAKE_SYSTEM_LIBRARY_PATH=/lib32:/usr/lib32:/usr/local/lib32 \
-	-DFIND_LIBRARY_USE_LIB64_PATHS=OFF \
-	-DCMAKE_IGNORE_PATH=/lib:/usr/lib:/usr/local/lib \
-	-DCMAKE_TOOLCHAIN_FILE=$TRAVIS_BUILD_DIR/cmake/i386-linux-gnu.toolchain.cmake \
-	-DBUSTED_OUTPUT_TYPE=plainTerminal"
-
-# Build and output version info.
-$MAKE_CMD DEPS_CMAKE_FLAGS="$CMAKE_EXTRA_FLAGS" \
-	CMAKE_EXTRA_FLAGS="$CMAKE_EXTRA_FLAGS" nvim
-build/bin/nvim --version
-
-# Build library.
-$MAKE_CMD CMAKE_EXTRA_FLAGS="$CMAKE_EXTRA_FLAGS" libnvim
-
-# Run unittests.
-$MAKE_CMD unittest
-
-# Run functional tests.
-$MAKE_CMD test
-check_core_dumps
-
-# Run legacy tests.
-$MAKE_CMD oldtest
-check_core_dumps
-
-# Test if correctly installed.
-sudo -E $MAKE_CMD install
-/usr/local/bin/nvim --version
-/usr/local/bin/nvim -e -c "quit"
diff --git a/.ci/gcc.sh b/.ci/gcc.sh
deleted file mode 100644
index 2e760c7b68..0000000000
--- a/.ci/gcc.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-. "$CI_SCRIPTS/common.sh"
-
-sudo pip install cpp-coveralls
-
-# FIXME: Valgrind temporarily disabled (Timeouts on Travis).
-# if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-# 	sudo apt-get install valgrind
-# 	export VALGRIND=1
-# 	export VALGRIND_LOG="$tmpdir/valgrind-%p.log"
-# fi
-
-setup_deps x64
-
-CMAKE_EXTRA_FLAGS="-DTRAVIS_CI_BUILD=ON \
-	-DUSE_GCOV=ON \
-	-DBUSTED_OUTPUT_TYPE=plainTerminal"
-
-# Build and output version info.
-$MAKE_CMD CMAKE_EXTRA_FLAGS="$CMAKE_EXTRA_FLAGS" nvim
-build/bin/nvim --version
-
-# Build library.
-$MAKE_CMD CMAKE_EXTRA_FLAGS="$CMAKE_EXTRA_FLAGS" libnvim
-
-# Run unittests.
-make unittest
-
-# Run functional tests.
-if ! $MAKE_CMD test; then
-	valgrind_check "$tmpdir"
-	exit 1
-fi
-valgrind_check "$tmpdir"
-
-# Run legacy tests.
-if ! $MAKE_CMD oldtest; then
-	valgrind_check "$tmpdir"
-	exit 1
-fi
-valgrind_check "$tmpdir"
-
-coveralls --encoding iso-8859-1 || echo 'coveralls upload failed.'
diff --git a/.ci/install.sh b/.ci/install.sh
new file mode 100755
index 0000000000..42c8026396
--- /dev/null
+++ b/.ci/install.sh
@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n "${CI_TARGET}" ]]; then
+  exit
+fi
+
+if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
+  brew install gettext
+elif [[ "${BUILD_MINGW}" == ON ]]; then
+  # TODO: When Travis gets a recent version of Mingw-w64 use packages:
+  # binutils-mingw-w64-i686 gcc-mingw-w64-i686 g++-mingw-w64-i686 mingw-w64-dev mingw-w64-tools
+
+  echo "Downloading MinGW..."
+  wget -q -O - "http://downloads.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win32/Personal%20Builds/rubenvb/gcc-4.8-release/i686-w64-mingw32-gcc-4.8.0-linux64_rubenvb.tar.xz" | tar xJf - -C "${HOME}/.local"
+fi
+
+pip install --user --upgrade cpp-coveralls neovim
diff --git a/.ci/mingw.sh b/.ci/mingw.sh
deleted file mode 100644
index e1372cecc9..0000000000
--- a/.ci/mingw.sh
+++ /dev/null
@@ -1,18 +0,0 @@
-. "$CI_SCRIPTS/common.sh"
-
-# FIXME: When Travis gets a recent version of Mingw-w64 use this
-#sudo apt-get install binutils-mingw-w64-i686 gcc-mingw-w64-i686 g++-mingw-w64-i686 mingw-w64-dev mingw-w64-tools
-#sudo apt-get install wine
-sudo apt-get install libc6-dev-i386
-
-# mingw-w64 build from http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/rubenvb/gcc-4.8-release/
-wget "http://downloads.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win32/Personal%20Builds/rubenvb/gcc-4.8-release/i686-w64-mingw32-gcc-4.8.0-linux64_rubenvb.tar.xz" -O mingw.tar.xz
-sudo tar -axf mingw.tar.xz -C /opt
-export PATH=$PATH:/opt/mingw32/bin
-
-# Build third-party
-mkdir .deps
-cd .deps
-cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/mingw32-w64-cross-travis.toolchain.cmake ../third-party/
-cmake --build .
-cd ..
diff --git a/.ci/run_tests.sh b/.ci/run_tests.sh
new file mode 100755
index 0000000000..f3a6466c5e
--- /dev/null
+++ b/.ci/run_tests.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+# TODO: Stop here for MinGW builds,
+#       building Neovim doesn't work yet.
+if [[ "${BUILD_MINGW}" == ON ]]; then
+  echo "Neovim doesn't build on MinGW yet; stopping build."
+  touch "${SUCCESS_MARKER}"
+  exit
+fi
+
+CI_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "${CI_DIR}/common/build.sh"
+source "${CI_DIR}/common/test.sh"
+
+build_nvim
+
+run_unittests
+run_functionaltests
+run_oldtests
+
+install_nvim
+
+touch "${SUCCESS_MARKER}"
diff --git a/.ci/script.sh b/.ci/script.sh
new file mode 100755
index 0000000000..4d0666ec0e
--- /dev/null
+++ b/.ci/script.sh
@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+
+if [[ -n "${CI_TARGET}" ]]; then
+  make lint
+  exit 0
+fi
+
+# This will pass the environment variables down to a bash process which runs
+# as $USER, while retaining the environment variables defined and belonging
+# to secondary groups given above in usermod.
+if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
+  # Set up precompiled third-party dependencies.
+  eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) deps-x64"
+
+  sudo -E su "${USER}" -c ".ci/run_tests.sh"
+else
+  .ci/run_tests.sh
+fi