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Filename : configure
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#!/bin/sh -eu

# Re-exec outside of apparmor confinement
if [ -d /sys/kernel/security/apparmor ] && [ "$(cat /proc/self/attr/current)" != "unconfined" ]; then
    exec aa-exec -p unconfined -- "$0" "$@"
fi

# Utility functions
get_bool() {
    value=$(echo "${1:-}" | tr '[:upper:]' '[:lower:]')

    # See if it's true
    for yes in "true" "1" "yes" "on"; do
        if [ "${value}" = "${yes}" ]; then
            echo "true"
            return
        fi
    done

    # See if it's false
    for no in "false" "0" "no" "off"; do
        if [ "${value}" = "${no}" ]; then
            echo "false"
            return
        fi
    done

    # Invalid value (or not set)
    return
}

verify_int () {
    value="${1:-}"

    # Verify if the value is a positive integer
    if echo "${value}" | grep -Eq '^[0-9]+$'; then
        echo "${value}"
        return
    fi

    # Invalid value (or not set)
    return
}

# Don't fail if the mount namespace isn't properly setup yet
if [ ! -e /run/snapd-snap.socket ]; then
    exit 0
fi

# Get the current config
ceph_builtin=$(get_bool "$(snapctl get ceph.builtin)")
ceph_external=$(get_bool "$(snapctl get ceph.external)")
criu_enable=$(get_bool "$(snapctl get criu.enable)")
daemon_debug=$(get_bool "$(snapctl get daemon.debug)")
daemon_group=$(snapctl get daemon.group)
daemon_syslog=$(get_bool "$(snapctl get daemon.syslog)")
daemon_verbose=$(get_bool "$(snapctl get daemon.verbose)")
lvm_external=$(get_bool "$(snapctl get lvm.external)")
lxcfs_loadavg=$(get_bool "$(snapctl get lxcfs.loadavg)")
lxcfs_pidfd=$(get_bool "$(snapctl get lxcfs.pidfd)")
lxcfs_cfs=$(get_bool "$(snapctl get lxcfs.cfs)")
openvswitch_builtin=$(get_bool "$(snapctl get openvswitch.builtin)")
openvswitch_external=$(get_bool "$(snapctl get openvswitch.external)")
shiftfs_enable=$(get_bool "$(snapctl get shiftfs.enable)")

# Special-handling of daemon.preseed
daemon_preseed=$(snapctl get daemon.preseed)
if [ -n "${daemon_preseed}" ]; then
    echo "${daemon_preseed}" > "${SNAP_COMMON}/init.yaml"
fi

# Generate the config
config="${SNAP_COMMON}/config"

{
    echo "# This file is auto-generated, do NOT manually edit"
    echo "ceph_builtin=${ceph_builtin:-"false"}"
    echo "ceph_external=${ceph_external:-"false"}"
    echo "criu_enable=${criu_enable:-"false"}"
    echo "daemon_debug=${daemon_debug:-"false"}"
    echo "daemon_group=${daemon_group:-"lxd"}"
    echo "daemon_syslog=${daemon_syslog:-"false"}"
    echo "daemon_verbose=${daemon_verbose:-"false"}"
    echo "lvm_external=${lvm_external:-"false"}"
    echo "lxcfs_loadavg=${lxcfs_loadavg:-"false"}"
    echo "lxcfs_pidfd=${lxcfs_pidfd:-"false"}"
    echo "lxcfs_cfs=${lxcfs_cfs:-"false"}"
    echo "openvswitch_builtin=${openvswitch_builtin:-"false"}"
    echo "openvswitch_external=${openvswitch_external:-"false"}"
    echo "shiftfs_enable=${shiftfs_enable:-"auto"}"
} > "${config}"

# Set socket ownership in case it changed
if getent group "${daemon_group}" >/dev/null 2>&1; then
    if [ -e "${SNAP_COMMON}/lxd/unix.socket" ]; then
        chgrp "${daemon_group}" "${SNAP_COMMON}/lxd/unix.socket"
    fi
fi

exit 0