lxc_runner.sh

#!/bin/bash
set -eux
. ${WORKSPACE}/cilib.sh

# Map hosts paths into the container
LXC_HOME=/home/ubuntu
LXC_WORKSPACE=$LXC_HOME/workspace


ci_lxc_init_runner()
{
    # pass return variable to accept container name
    # automatically cleans up the container at the end
    # of the bash script unless "notrap" is passed

    # Usage:
    # ci_lxc_init_runner name_of_container [notrap]
    local  __resultvar=$1
    local  __trap=${2:-trap}

    # init a container runner on the build host
    local lxc_container=${JOB_NAME%%/*}-$(openssl rand -hex 10)-${BUILD_NUMBER}
    local lxc_apt_list=${LXC_APT_LIST:-}
    local lxc_snap_list=${LXC_SNAP_LIST:-}
    local lxc_push_list=${LXC_PUSH_LIST:-}
    local lxc_mount_list=${LXC_MOUNT_LIST:-}

    # prepare env file for runner
    declare -px > .env
    echo "declare -x HOME=${LXC_HOME}" >> ${WORKSPACE}/.env
    echo "declare -x HUDSON_HOME=${LXC_HOME}" >> ${WORKSPACE}/.env
    echo "declare -x JENKINS_HOME=${LXC_HOME}" >> ${WORKSPACE}/.env
    echo "declare -x PWD=${LXC_WORKSPACE}" >> ${WORKSPACE}/.env
    echo "declare -x WORKSPACE=${LXC_WORKSPACE}" >> ${WORKSPACE}/.env
    echo "declare -x WORKSPACE_TMP=${LXC_WORKSPACE}@tmp" >> ${WORKSPACE}/.env
    echo "declare -x PYTHONPATH=${LXC_WORKSPACE}:\"${PYTHONPATH:-}\"" >> ${WORKSPACE}/.env

    # ensure the container is torn down at the end of the job
    if [ "${__trap}" != "notrap" ]; then
       trap "ci_lxc_delete ${lxc_container}" EXIT
    fi

    # Start fresh container
    ci_lxc_delete ${lxc_container} || true
    ci_lxc_launch ubuntu:22.04 ${lxc_container}

    # Install runtime dependencies in the container
    # Install debs, replacing semicolons with spaces
    ci_lxc_apt_install_retry ${lxc_container} ${lxc_apt_list//,/ }

    # Install snaps and push paths and mount paths
    _IFS=${IFS} # restore IFS
    IFS=','

    # Mount the mapped paths
    ci_lxc_mount ${lxc_container} workspace ${WORKSPACE} ${LXC_WORKSPACE}
    for mount_path in ${lxc_mount_list}; do
        if [ -d "${HOME}/${mount_path}" ]; then
            ci_lxc_mount ${lxc_container} "home${mount_path}" ${HOME}/${mount_path} ${LXC_HOME}/${mount_path}
        fi
    done

    for snap_args in ${lxc_snap_list}; do
        # snap_args could contain arguments separated by spaces
        # `juju --channel=2.9/stable` which requires splitting
        # on spaces to extract
        IFS=' ' read -a args <<< "$snap_args"; 
        ci_lxc_snap_install_retry ${lxc_container} ${args[@]} --classic < /dev/null
    done

    # push file paths from the host
    for push_path in ${lxc_push_list}; do
        ci_lxc_push ${lxc_container} ${push_path} ${push_path}
    done
    IFS=${_IFS} # restore IFS

    eval $__resultvar="'$lxc_container'"
}


ci_lxc_job_run()
{
    # Run the job script inside the lxc runner
    local lxc_workspace=/home/ubuntu/workspace
    ci_lxc_exec_user --cwd=${lxc_workspace} --env WORKSPACE=${lxc_workspace} $@
}