task.yaml

summary: validate ubuntu-core snap

prepare: |
    sysctl -w net.ipv6.conf.all.disable_ipv6=1
    trap "sysctl -w net.ipv6.conf.all.disable_ipv6=0" EXIT
    apt update

    apt autoremove -y --purge snapd || true
    apt install -y snapd jq

restore: |
    apt purge -y snapd jq
    apt-get autoremove -y
    rm -f oldVersion newVersion

execute: |
    change_id() {
        # takes <summary pattern> [<status>]
        local SUMMARY_PAT=$1
        local STATUS=${2:-}
        snap changes|grep -o -P "^\d+(?= *${STATUS}.*${SUMMARY_PAT}.*)"
    }

    snap list 2>&1 | MATCH 'No snaps are installed yet.'

    snap download --${UBUNTU_CORE_CHANNEL} ubuntu-core
    snap ack ./ubuntu-core_*.assert
    snap install ./ubuntu-core_*.snap

    # modify daemon state to set ubuntu-core-transition-last-retry-time to the
    # current time to prevent the ubuntu-core transition
    systemctl stop snapd.{service,socket}
    now=$(date --utc -Ins)
    cat /var/lib/snapd/state.json | jq -c '. + {data: (.data + {"ubuntu-core-transition-last-retry-time": "'"$now"'"})}' > state.json.new
    mv state.json.new /var/lib/snapd/state.json
    systemctl start snapd.{service,socket}

    snap install test-snapd-tools
    /snap/bin/test-snapd-tools.echo hello! | MATCH hello!

    snap install test-snapd-python-webserver
    snap interfaces | MATCH ":network-bind +test-snapd-python-webserver"

    # restore ubuntu-core-transition-last-retry-time to its previous value and restart the daemon
    systemctl stop snapd.{service,socket}
    cat /var/lib/snapd/state.json | jq -c 'del(.["data"]["ubuntu-core-transition-last-retry-time"])' > state.json.new
    mv state.json.new /var/lib/snapd/state.json
    systemctl start snapd.{service,socket}

    while ! snap changes|grep ".*Done.*Transition ubuntu-core to core"; do
        snap changes
        snap change $(change_id "Transition ubuntu-core to core")||true
        sleep 1
    done

    if snap list|grep ubuntu-core; then
        echo "ubuntu-core still installed, transition failed"
        exit 1
    fi

    snap interfaces | MATCH ":network-bind +test-snapd-python-webserver"

    /snap/bin/test-snapd-tools.echo hello! | MATCH hello!