/lib/lsb/init-functions.d/50-ubuntu-logging is in lsb-base 4.1+Debian11ubuntu6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | # Default init script logging functions suitable for Ubuntu.
# See /lib/lsb/init-functions for usage help.
LOG_DAEMON_MSG=""
log_use_plymouth () {
    if [ "${loop:-n}" = y ]; then
        return 1
    fi
    plymouth --ping >/dev/null 2>&1
}
log_success_msg () {
    echo " * $@" || true
}
log_failure_msg () {
    if log_use_fancy_output; then
        RED=`$TPUT setaf 1`
        NORMAL=`$TPUT op`
        echo " $RED*$NORMAL $@" || true
    else
        echo " * $@" || true
    fi
}
log_warning_msg () {
    if log_use_fancy_output; then
        YELLOW=`$TPUT setaf 3`
        NORMAL=`$TPUT op`
        echo " $YELLOW*$NORMAL $@" || true
    else
        echo " * $@" || true
    fi
}
log_begin_msg () {
    log_daemon_msg "$1"
}
log_daemon_msg () {
    if [ -z "$1" ]; then
        return 1
    fi
    if log_use_fancy_output && $TPUT xenl >/dev/null 2>&1; then
        COLS=`$TPUT cols`
        if [ "$COLS" ] && [ "$COLS" -gt 6 ]; then
            COL=`$EXPR $COLS - 7`
        else
            COLS=80
            COL=73
        fi
        if log_use_plymouth; then
            # If plymouth is running, don't output anything at this time
            # to avoid buffering problems (LP: #752393)
            if [ -z "$LOG_DAEMON_MSG" ]; then
                LOG_DAEMON_MSG=$*
                return
            fi
        fi
        # We leave the cursor `hanging' about-to-wrap (see terminfo(5)
        # xenl, which is approximately right). That way if the script
        # prints anything then we will be on the next line and not
        # overwrite part of the message.
        # Previous versions of this code attempted to colour-code the
        # asterisk but this can't be done reliably because in practice
        # init scripts sometimes print messages even when they succeed
        # and we won't be able to reliably know where the colourful
        # asterisk ought to go.
        printf " * $*       " || true
        # Enough trailing spaces for ` [fail]' to fit in; if the message
        # is too long it wraps here rather than later, which is what we
        # want.
        $TPUT hpa `$EXPR $COLS - 1` || true
        printf ' ' || true
    else
        echo " * $@" || true
        COL=
    fi
}
log_progress_msg () {
    :
}
log_end_msg () {
    if [ -z "$1" ]; then
        return 1
    fi
    if [ "$COL" ] && [ -x "$TPUT" ]; then
        # If plymouth is running, print previously stored output
        # to avoid buffering problems (LP: #752393)
        if log_use_plymouth; then
            if [ -n "$LOG_DAEMON_MSG" ]; then
                log_daemon_msg $LOG_DAEMON_MSG
                LOG_DAEMON_MSG=""
            fi
        fi
        printf "\r" || true
        $TPUT hpa $COL
        if [ "$1" -eq 0 ]; then
            echo "[ OK ]" || true
        else
            printf '[' || true
            $TPUT setaf 1 || true # red
            printf fail || true
            $TPUT op || true # normal
            echo ']' || true
        fi
    else
        if [ "$1" -eq 0 ]; then
            echo "   ...done." || true
        else
            echo "   ...fail!" || true
        fi
    fi
    return $1
}
log_action_msg () {
    echo " * $@" || true
}
log_action_begin_msg () {
    log_daemon_msg "$@..." || true
}
log_action_cont_msg () {
    log_daemon_msg "$@..." || true
}
log_action_end_msg () {
    # In the future this may do something with $2 as well.
    log_end_msg "$1" || true
}
 |