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#!/bin/bash
#
# Copyright (c) 2021, 2022 Oracle and/or its affiliates.
# Licensed under the Universal Permissive License v 1.0 as shown at https://oss.oracle.com/licenses/upl
#
# alx

. /usr/lib/alx-utils/functions

usage() {
    cat >&2 << EOF
Usage: ${0##*/} [OPTION]...
  help     - Show this message
  init     - Initialize Oracle Autnomous Linux
  validate - Validate Oracle Autonomous Linux
  version  - Show version
  show     - Show Oracle Autonomous Linux details, allowed values:
               instance_id
               compartment_id
               realm_key
               os_family
               os_arch
               os_version
               reboot_required
               osms_ready
               enabled_yum_repos
               used_yum_repos
               ksplice_effective_kernel_version|kekv
               known_exploit_detection|ked
  clear    - Clear message history, allowed values:
               known_exploit_detection|ked
EOF
}

do_init() {
    run_as_root_check
    acquire_lock 30
    log "Initializing Oracle Autonomous Linux."

    # boot time initialization
    if [ "$1" = "--boot" ]; then
        # clear migrated file if instance id has changed
        if [ -f /var/lib/alx-migrate/migrated ]; then
            instance_id=$(get_instance_id)
            [ "$instance_id" != "$(cat /var/lib/alx-migrate/migrated)" ] &&
                rm -rf /var/lib/alx-migrate/migrated \
                    /var/lib/alx-migrate/migrate \
                    /var/lib/alx-migrate/migration
        fi
        # Create yum uuid file if it doesn't exist
        if [ "$OL_VERSION" = 7 ] && [ ! -f /var/lib/yum/uuid ]; then
            local uuid=$(uuidgen)
            echo -n "$uuid" > /var/lib/yum/uuid
        fi
    fi

    # Fix file /var/lib/yum/uuid permissions - 644
    if [ "$OL_VERSION" = 7 ] && [ -f /var/lib/yum/uuid ]; then
        if [ "$(stat -c '%a' /var/lib/yum/uuid 2>/dev/null)" != 644 ]; then
            chmod 644 /var/lib/yum/uuid
        fi
    fi

    # Disable ksplice autoinstall as ksplice updates install is done by OSMS SJ
    is_ksplice_autoinstall_disabled || disable_ksplice_autoinstall

    # Set ksplice access key for AL only
    is_ksplice_access_key_set || set_ksplice_access_key

    # OSMS/OSMH: add or remove OSMS userspace ksplice yum repo
    is_userspace_ksplice_yum_repo_set || set_userspace_ksplice_yum_repo

    # Enable known exploit detection
    is_known_exploit_detection_enabled || enable_known_exploit_detection

    # Set vmcore save path in kdump.conf
    is_kdump_vmcore_path_set || set_kdump_vmcore_path

    # Set DeleteUploaded = yes in /etc/abrt/abrt.conf
    # Set CopyVMcore = no in /etc/abrt/plugins/vmcore.conf
    # optimize sosreport cmd
    is_abrt_configured || configure_abrt

    # set OSWatcher maximum age to 12 hours
    is_oswatcher_configured || configure_oswatcher

    # create oops fifos
    are_oops_fifos_created || create_oops_fifos

    # Set yum/dnf installonly_limit to 2
    is_installonly_limit_set || set_installonly_limit

    # attempt to activate know exploit detection
    is_known_exploit_detection_activated || activate_known_exploit_detection
    log "Initialized Oracle Autonomous Linux."
}

# undo init
do_restore() {
    # restore uptrack.conf
    is_osms_userspace_ksplice_yum_repo_set &&
        unset_osms_userspace_ksplice_yum_repo
}

do_validate() {
    run_as_root_check

    # mandatory tasks on every check-in
    # Disable ksplice autoinstall as ksplice updates install is done by OSMS SJ
    is_ksplice_autoinstall_disabled || disable_ksplice_autoinstall
    # attempt to activate known exploit detection
    is_known_exploit_detection_activated || activate_known_exploit_detection

    log "Validating Oracle Autonomous Linux configuration."

    (is_osmh_enabled || is_osms_ready) &&
    is_ksplice_access_key_set &&
    is_ksplice_autoinstall_disabled &&
    is_userspace_ksplice_yum_repo_set &&
    is_known_exploit_detection_enabled &&
    is_kdump_vmcore_path_set &&
    is_abrt_configured &&
    is_oswatcher_configured &&
    are_oops_fifos_created &&
    is_installonly_limit_set

    local ret=$?

    if [ "$ret" -eq 0 ]; then
        log "Validated."
    else
        log_error "Validation failed."
    fi
    return $ret
}

do_report() {
    local what=$1
    case "$what" in
        "known_exploit_detection"|"ked")
            run_as_root_check
            local op=$2
            if [ "$op" = "--start" ]; then
                start_known_exploit_detection_report
            elif [ "$op" == "--end" ]; then
                end_known_exploit_detection_report
            else
                usage
            fi
            ;;
        *)
            usage
            ;;
    esac
}

do_clear() {
    local what=$1
    case "$what" in
        "known_exploit_detection"|"ked")
            run_as_root_check
            clear_known_exploit_detection_history
            ;;
        *)
            usage
            ;;
    esac
}

show_all() {
    echo "Instance ID: $(get_instance_id)"
    echo "Compartment ID: $(get_compartment_id)"
    echo "Realm Key: $(get_realm_key)"
    echo "OS Family: $(get_os_family)"
    echo "OS Architecture: $(get_os_arch)"
    echo "OS Version: $(get_os_version)"
    echo "Ksplice Effective Kernel Version: $(get_ksplice_effective_kernel_version)"
    if is_reboot_required; then
        echo "Reboot Required: yes"
    else
        echo "Reboot Required: no"
    fi
    # OSMH
    if is_osmh_enabled; then
        echo "OS Management Hub enabled: yes"
        if is_autonomous_linux_instance; then
            echo "Oracle Autonomous Linux enabled: yes"
        else
            echo "Oracle Autonomous Linux enabled: no"
        fi
    # OSMS
    else
        if is_osms_ready; then
            echo "OSMS ready: yes"
        else
            echo "OSMS ready: no"
        fi
        echo
        echo "Enabled Yum Repositories:"
        list_enabled_yum_repos || log_error "OSMS is not ready."
    fi
}

do_show() {
    local what=$1
    case "$what" in
        "instance_id")
            echo "$(get_instance_id)"
            ;;
        "compartment_id")
            echo "$(get_compartment_id)"
            ;;
        "realm_key")
            echo "$(get_realm_key)"
            ;;
        "os_family")
            echo "$(get_os_family)"
            ;;
        "os_arch")
            echo "$(get_os_arch)"
            ;;
        "os_version")
            echo "$(get_os_version)"
            ;;
        "ksplice_effective_kernel_version"|"kekv")
            echo "$(get_ksplice_effective_kernel_version)"
            ;;
        "reboot_required")
            run_as_root_check
            if is_reboot_required; then
                echo "yes"
            else
                echo "no"
            fi
            ;;
        "known_exploit_detection"|"ked")
            run_as_root_check
            get_known_exploit_detection
            ;;
        "osms_ready")
            if is_osms_ready; then
                echo "yes"
            else
                echo "no"
            fi
            ;;
        "enabled_yum_repos")
            if is_osmh_enabled; then
                echo "Not supported."
            else
                run_as_root_check
                list_enabled_yum_repos
                ret=$?
                if [ $ret -ne 0 ]; then
                    echo "OSMS is not ready." >&2
                fi
                return $ret
            fi
            ;;
        "used_yum_repos")
            list_used_yum_repos || echo "Yum error." >&2
            ;;
        "migrated") #hidden
            run_as_root_check
            [ -f /var/lib/alx-migrate/migrated ] && echo "yes" || echo "no"
            ;;
        "migration") #hidden
            run_as_root_check
            get_migration_status
            ;;
        "all"|"")
            run_as_root_check
            show_all
            ;;
        *)
            usage
            ;;
    esac
}

show_version () {
    local rpm_version
    rpm_version=$(rpm -q --queryformat "%{VERSION}-%{RELEASE}" alx-utils \
        2>/dev/null)
    if [ $? -eq 0 -a -n "$rpm_version" ]; then
        echo "$rpm_version" | sed 's/.el[789]$//'
    else
        echo "$version"
    fi
}

subcmd=$1
shift

case "$subcmd" in
    "init")
        do_init $*
        ;;
    "show")
        do_show $*
        ;;
    "validate")
        do_validate $*
        ;;
    "report")
        do_report $*
        ;;
    "clear")
        do_clear $*
        ;;
    "restore")
        do_restore $*
        ;;
    "version")
        show_version
        ;;
    *)
        usage
        ;;
esac