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Dir : ~/usr/local/psa/admin/sbin/modules/ntp-timesync/
View File Name : time-mng.sh

#!/usr/bin/env bash
### Copyright 1999-2024. WebPros International GmbH. All rights reserved.

PN=$(basename "$0")

usage() {
	cat << EOT
Usage: $PN [OPTIONS...] COMMAND

Commands:
    --reload SERVICE              reloads systemd service
    --enable SERVICE              enables systemd service
    --disable SERVICE             disables systemd service

    --enable-sync                 enable network time synchronization
    --disable-sync                disable network time synchronization

    --is-sync-enabled             checks whether network time synchronization is enabled
    --is-synced                   checks whether clock is syncing with the remote server

    --list-service-overrides      reports the list of service overrides
EOT
}

###############################################################################
# Puts message to STDERR and halts execution
# Arguments:
#   Any amount of strings
# Output:
#   Concatenated strings to STDERR
fail() {
    echo "$*" >&2
    exit 1
}

###############################################################################
# Tries to extract SYSTEMD_TIMEDATED_NTP_SERVICES value from the input
# Arguments:
#   String with the list of envvars
# Output:
#   Value of the SYSTEMD_TIMEDATED_NTP_SERVICES, split into newlines
read_env_override() {
    local env

    env=$(grep -oEm 1 'SYSTEMD_TIMEDATED_NTP_SERVICES=[a-zA-Z0-9:_.\\-]+' <<<"$1")
    if [[ -n "$env" ]]; then
        cut -d'=' -f2 <<<"$env" | tr ':' $'\n'
        return 0
    fi

    return 1
}

###############################################################################
# Sends a DBus request to timedate1 endpoint and reads it as boolean
# Arguments:
#   Property of the DBus listener
#   (https://man7.org/linux/man-pages/man5/org.freedesktop.timedate1.5.html)
# Output:
#   "true", or "false", based on the content of the property
timedate1_dbus_request() {
    local response='' property="${1:?'DBus property was not provided to function'}"
    if ! response=$(dbus-send --system \
        --dest=org.freedesktop.timedate1 \
        --print-reply=literal \
        /org/freedesktop/timedate1 \
        org.freedesktop.DBus.Properties.Get \
        string:org.freedesktop.timedate1 \
        "string:${property}" 2>&1 \
    ); then
        fail "Cannot get time synchronization status: dbus-send failed with: $response"
    fi

    if grep -q "true" <<<"$response"; then
        echo "true"
    else
        echo "false"
    fi
}

###############################################################################
# Lists systemd NTP unit overrides in correct order
# Output:
#   systemd NTP unit names
get_override_services() {
    local env file

    # SYSTEMD_TIMEDATED_NTP_SERVICES has precedence over configuration files
    if read_env_override "$(systemctl show-environment)"; then
        return 0
    fi

    if read_env_override "$(systemctl show --property=Environment systemd-timesyncd.service)"; then
        return 0
    fi

    while read -r env; do
        file=$(awk -F'=' '{ gsub(/^[\s-]+/, "", $2); print $2 }' <<<"$env")
        if [[ -f "$file" ]]; then
            if read_env_override "$(tac "$file")"; then
                return 0
            fi
        fi
    done < <(systemctl cat systemd-timesyncd.service | grep EnvironmentFile | tac)

    [[ ! -d /usr/lib/systemd/ntp-units.d/ ]] && return 0

    find /usr/lib/systemd/ntp-units.d/ -maxdepth 1 -type f -name '*.list' -print0 \
        | sort -nz | xargs -0 cat
    return $?
}

###############################################################################
# Reloads, or restarts a systemd service
# Arguments:
#   Service name
# Output:
#   systemd informational output
reload() {
    local service="${1?:'Service name was not provided to reload'}"

    # Recent systemd versions name this function as try-reload-or-restart
    systemctl status "$service" && systemctl reload-or-try-restart "$service" || systemctl start "$service"
    return $?
}

###############################################################################
# Sets NTP sync status
# Arguments:
#   New status ("true" or "false")
# Output:
#   timedatectl informational output
set_sync_status() {
    local bool="${1?:'New status was not provided to set_sync_status'}"
    timedatectl set-ntp "$bool"

    exit $?
}

###############################################################################
# Gets NTP sync capability
# Output:
#   "true" or "false", based on whether systemd detects a compatible unit
get_sync_capability() {
    timedate1_dbus_request "CanNTP"
    return $?
}

###############################################################################
# Gets whether system clock is synchronized with NTP
# Output:
#   "true" or "false", based on the sync status
is_synced() {
    timedate1_dbus_request "NTPSynchronized"
    return $?
}

main() {
    local arg command="$1"
    case "$command" in
        --reload)
            arg="${2?:'Service name was not provided to the command'}"
            reload "$arg"
            exit $?
        ;;
        --enable-sync)
            set_sync_status "true"
            exit $?
        ;;
        --disable-sync)
            set_sync_status "false"
            exit $?
        ;;
        --is-sync-possible)
            get_sync_capability
            exit $?
        ;;
        --is-synced)
            is_synced
            exit $?
        ;;
        --list-service-overrides)
            get_override_services
            exit $?
        ;;
        -h|--help)
            usage
        ;;
        *)
            usage
            fail "Unrecognized command: ${command}"
    esac
}

main "$@"