language: python
dist: bionic

# We use two different caching strategies.  The default is to cache pip
# packages (as most of our jobs use pip packages), which is configured here.
# For the integration tests, we instead want to cache the lxd images and
# package build schroot.
#
# We cache the lxd images because this saves a few seconds in the general
# case, but provides substantial speed-ups when cloud-images.ubuntu.com, the
# source of the images, is under heavy load.  The directory in which the lxd
# images are stored (/var/snap/lxd/common/lxd/images/) is not
# readable/writeable by the default user (which is a requirement for caching),
# so we instead cache the `lxd_images/` directory.  We move lxd images out of
# there before we run tests and back in once tests are complete.  We _move_ the
# images out and only copy the most recent lxd image back into the cache, to
# avoid our cache growing without bound.  (We only need the most recent lxd
# image because the integration tests only use a single image.)
#
# We cache the package build schroot because it saves 2-3 minutes per build.
# Without caching, we have to perform a debootstrap for every build.  We update
# the schroot before storing it back in the cache, to ensure that we aren't
# just using an increasingly-old schroot as time passes.  The cached schroot is
# stored as a tarball, to preserve permissions/ownership.
cache: pip

install:
    # Required so `git describe` will definitely find a tag; see
    # https://github.com/travis-ci/travis-ci/issues/7422
    - git fetch --unshallow
    - pip install tox

script:
    - tox

matrix:
    fast_finish: true
    include:
        - python: 3.6
          env:
              TOXENV=py3
              PYTEST_ADDOPTS=-v  # List all tests run by pytest
        - if: NOT branch =~ /^ubuntu\//
          cache:
              - directories:
                  - lxd_images
                  - chroots
          before_cache:
              - |
                  # Find the most recent image file
                  latest_file="$(sudo ls -Art /var/snap/lxd/common/lxd/images/ | tail -n 1)"
                  # This might be <hash>.rootfs or <hash>, normalise
                  latest_file="$(basename $latest_file .rootfs)"
                  # Find all files with that prefix and copy them to our cache dir
                  sudo find /var/snap/lxd/common/lxd/images/ -name $latest_file* -print -exec cp {} "$TRAVIS_BUILD_DIR/lxd_images/" \;
          install:
            - git fetch --unshallow
            - sudo apt-get install -y --install-recommends sbuild ubuntu-dev-tools fakeroot tox debhelper
            - pip install .
            - pip install tox
            # bionic has lxd from deb installed, remove it first to ensure
            # pylxd talks only to the lxd from snap
            - sudo apt remove --purge lxd lxd-client
            - sudo rm -Rf /var/lib/lxd
            - sudo snap install lxd
            - sudo lxd init --auto
            - sudo mkdir --mode=1777 -p /var/snap/lxd/common/consoles
            # Move any cached lxd images into lxd's image dir
            - sudo find "$TRAVIS_BUILD_DIR/lxd_images/" -type f -print -exec mv {} /var/snap/lxd/common/lxd/images/ \;
            - sudo usermod -a -G lxd $USER
            - sudo sbuild-adduser $USER
            - cp /usr/share/doc/sbuild/examples/example.sbuildrc /home/$USER/.sbuildrc
          script:
            # Ubuntu LTS: Build
            - ./packages/bddeb -S -d --release xenial
            - |
                needs_caching=false
                if [ -e "$TRAVIS_BUILD_DIR/chroots/xenial-amd64.tar" ]; then
                    # If we have a cached chroot, move it into place
                    sudo mkdir -p /var/lib/schroot/chroots/xenial-amd64
                    sudo tar --sparse --xattrs --preserve-permissions --numeric-owner -xf "$TRAVIS_BUILD_DIR/chroots/xenial-amd64.tar" -C /var/lib/schroot/chroots/xenial-amd64
                    # Write its configuration
                    cat > sbuild-xenial-amd64 << EOM
                [xenial-amd64]
                description=xenial-amd64
                groups=sbuild,root,admin
                root-groups=sbuild,root,admin
                # Uncomment these lines to allow members of these groups to access
                # the -source chroots directly (useful for automated updates, etc).
                #source-root-users=sbuild,root,admin
                #source-root-groups=sbuild,root,admin
                type=directory
                profile=sbuild
                union-type=overlay
                directory=/var/lib/schroot/chroots/xenial-amd64
                EOM
                    sudo mv sbuild-xenial-amd64 /etc/schroot/chroot.d/
                    sudo chown root /etc/schroot/chroot.d/sbuild-xenial-amd64
                    # And ensure it's up-to-date.
                    before_pkgs="$(sudo schroot -c source:xenial-amd64 -d / dpkg -l | sha256sum)"
                    sudo schroot -c source:xenial-amd64 -d / -- sh -c "apt-get update && apt-get -qqy upgrade"
                    after_pkgs=$(sudo schroot -c source:xenial-amd64 -d / dpkg -l | sha256sum)
                    if [ "$before_pkgs" != "$after_pkgs" ]; then
                        needs_caching=true
                    fi
                else
                    # Otherwise, create the chroot
                    sudo -E su $USER -c 'mk-sbuild xenial'
                    needs_caching=true
                fi
                # If there are changes to the schroot (or it's entirely new),
                # tar up the schroot (to preserve ownership/permissions) and
                # move it into the cached dir; no need to compress it because
                # Travis will do that anyway
                if [ "$needs_caching" = "true" ]; then
                    sudo tar --sparse --xattrs --xattrs-include=* -cf "$TRAVIS_BUILD_DIR/chroots/xenial-amd64.tar" -C /var/lib/schroot/chroots/xenial-amd64 .
                fi
            # Use sudo to get a new shell where we're in the sbuild group
            - sudo -E su $USER -c 'sbuild --nolog --no-run-lintian --verbose --dist=xenial cloud-init_*.dsc'
            # Ubuntu LTS: Integration
            - sg lxd -c 'tox -e citest -- run --verbose --preserve-data --data-dir results --os-name xenial --test modules/apt_configure_sources_list.yaml --test modules/ntp_servers --test modules/set_password_list --test modules/user_groups --deb cloud-init_*_all.deb'
        - python: 3.5
          env:
              TOXENV=xenial
              PYTEST_ADDOPTS=-v  # List all tests run by pytest
          dist: xenial
        - python: 3.6
          env: TOXENV=flake8
        - python: 3.6
          env: TOXENV=pylint
        - python: 3.6
          env: TOXENV=doc