NetworkManager/contrib/scripts/NM-log

#!/bin/bash

# Util to pretty-print logfile of NetworkManager
#
# Unless setting NM_LOG_NO_COLOR it will colorize the output.
# Suppress coloring with:
# $ NM_LOG_NO_COLOR=1 NM-log ...
#
# If called without arguments, it either reads from stdin (if not
# connected to a terminal) or it shows the journal content.
#
# If called with first argument "j", it always shows the journal content.
#
# You can pass multiple filenames.

if [[ "$_" == "$0" ]]; then
    NM_not_sourced=1
else
    unset NM_not_sourced
fi

NM-show-journal() {
    local since="$(systemctl show NetworkManager | sed -n 's/^ExecMainStartTimestamp=\(.*\) [A-Z0-9]\+$/\1/p')"

    if [[ "$since" == "" ]]; then
       echo "error detecting NM. Is it running?"
       systemctl status NetworkManager
    else
       exec journalctl -o short-precise --since "$since" -b 0 -u NetworkManager "$@"
    fi
}

NM-colorize() {
    if [[ "$NM_LOG_NO_COLOR" == "" ]]; then
        # poor man's coloring using grep.
        # TODO: do it somehow better (and more efficient).
        GREP_COLOR='01;33' grep -a --color=always '^\|^\(.* \)\?<\(warn>\|info> \|error>\) \(.*\<is starting\>.*$\)\?' | \
        GREP_COLOR='01;37' grep -a --color=always '^\|\<platform: signal: .*$' | \
        GREP_COLOR='01;34' grep -a --color=always '^\|\<platform-linux: link: change \|\<platform: link: setting .*$\|\<platform: \(route\|address\): .*$\|\<platform-linux: sysctl: setting .*$' | \
        GREP_COLOR='01;35' grep -a --color=always '^\| audit: .*$' | \
        GREP_COLOR='01;32' grep -a --color=always '^\|\<device (.*): state change: '
    else
        /usr/bin/cat -
    fi
}

NM-log() {
    (
        if [ "$1" == "j" ]; then
            shift
            NM-show-journal "$@"
        elif [ "$#" -eq 0 -a -t 0 ]; then
            NM-show-journal
        else
            a="${1--}"
            shift
            /usr/bin/cat "$a" "$@"
        fi
    ) | \
        NM-colorize | \
        LESS=FRSXMK exec less -R
}

if [[ "$NM_not_sourced" != "" ]]; then
    NM-log "$@"
fi