criu: add .travis.yml (v3)

Travis CI is configured by adding a file named .travis.yml, which is a
YAML format text file, to the root directory of the GitHub
repository.[5]

Travis CI automatically detects when a commit has been made and pushed
to a GitHub repository that is using Travis CI, and each time this
happens, it will try to build the project and run tests.
""" https://en.wikipedia.org/wiki/Travis_CI

Currently Travis CI builds criu for x86_64 and ARM

v2: move travis-ci.sh in scripts
v3: fix path to the script in the script
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

.travis.yml

+language: c
+env:
+  - ARCH=arm
+  - ARCH=x86_64
+compiler:
+  - gcc
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq protobuf-c-compiler libprotobuf-c0-dev
+script:
+  - "bash -ex scripts/travis-ci.sh"

scripts/travis-ci.sh

+#!/bin/bash
+# Based on a test script from avsm/ocaml repo https://github.com/avsm/ocaml
+
+CHROOT_DIR=/tmp/arm-chroot
+MIRROR=http://ports.ubuntu.com/ubuntu-ports/
+VERSION=trusty
+CHROOT_ARCH=armhf
+
+# Debian package dependencies for the host
+HOST_DEPENDENCIES="debootstrap qemu-user-static binfmt-support sbuild"
+
+# Debian package dependencies for the chrooted environment
+GUEST_DEPENDENCIES="build-essential git m4 sudo python protobuf-c-compiler libprotobuf-c0-dev gcc make bsdmainutils bash"
+
+# Command used to run the tests
+TEST_COMMAND="make -j 2"
+
+function setup_arm_chroot {
+    # Host dependencies
+    sudo apt-get install -qq -y ${HOST_DEPENDENCIES}
+
+    # Create chrooted environment
+    sudo mkdir ${CHROOT_DIR}
+    sudo debootstrap --foreign --no-check-gpg --include=fakeroot,build-essential \
+        --arch=${CHROOT_ARCH} ${VERSION} ${CHROOT_DIR} ${MIRROR}
+    sudo cp /usr/bin/qemu-arm-static ${CHROOT_DIR}/usr/bin/
+    sudo chroot ${CHROOT_DIR} ./debootstrap/debootstrap --second-stage
+    sudo sbuild-createchroot --arch=${CHROOT_ARCH} --foreign --setup-only --components=main,universe,multiverse \
+        ${VERSION} ${CHROOT_DIR} ${MIRROR}
+
+    # Create file with environment variables which will be used inside chrooted
+    # environment
+    echo "export ARCH=${ARCH}" > envvars.sh
+    echo "export TRAVIS_BUILD_DIR=${TRAVIS_BUILD_DIR}" >> envvars.sh
+    chmod a+x envvars.sh
+
+    # Install dependencies inside chroot
+    sudo chroot ${CHROOT_DIR} apt-get update
+    sudo chroot ${CHROOT_DIR} apt-get --allow-unauthenticated install \
+        -qq -y ${GUEST_DEPENDENCIES}
+
+    # Create build dir and copy travis build files to our chroot environment
+    sudo mkdir -p ${CHROOT_DIR}/${TRAVIS_BUILD_DIR}
+    sudo rsync -av ${TRAVIS_BUILD_DIR}/ ${CHROOT_DIR}/${TRAVIS_BUILD_DIR}/
+
+    # Indicate chroot environment has been set up
+    sudo touch ${CHROOT_DIR}/.chroot_is_done
+
+    # Call ourselves again which will cause tests to run
+    sudo chroot ${CHROOT_DIR} bash -c "cd ${TRAVIS_BUILD_DIR} && ./scripts/travis-ci.sh"
+}
+
+if [ -e "/.chroot_is_done" ]; then
+  # We are inside ARM chroot
+  echo "Running inside chrooted environment"
+
+  . ./envvars.sh
+else
+  if [ "${ARCH}" = "arm" ]; then
+    # ARM test run, need to set up chrooted environment first
+    echo "Setting up chrooted ARM environment"
+    setup_arm_chroot
+    exit
+  fi
+fi
+
+echo "Running tests"
+echo "Environment: $(uname -a)"
+
+eval ${TEST_COMMAND}