wcheckrestart

#!/bin/sh
# wcheckrestart (part of ossobv/vcutil) // wdoekes/2014 // Public Domain
#
# Checks which services need to be restarted after an upgrade. Inspired
# by:
# - checkrestart (from debian-goodies), a more complicated version of this
# - https://locallost.net/?p=233
# - http://askubuntu.com/questions/194/how-can-i-install-just-\
#     security-updates-from-the-command-line
#
# Usage:
#
#    sudo wcheckrestart [-v] [options_to_ps]
#    sudo wcheckrestart -vv
#
# Examples:
#
#    # Check which processes need a restart and restart them.
#    sudo wcheckrestart
#    sudo /etc/init.d/this-and-that restart  # :)
#
#    # Check which PIDs still have an old libssl loaded.
#    sudo wcheckrestart -vv | grep libssl
#
#    # Pass options 'h' and '-o pid' to 'ps', to get the PIDs only.
#    sudo wcheckrestart -v h -o pid  # | awk NF=NF RS= OFS=,
# 
verbose=0
options_to_ps=f
if test "$*" = "-vv"; then
    verbose=2
elif test "$1" = "-v"; then
    verbose=1
    shift
fi
if test -n "$*"; then
    options_to_ps="$@"
fi

if test $(whoami) != root; then
    echo "must be root" 2>/dev/null
    exit 1
fi

shown=""
toshow=""
for pid in `ps fhax -opid`; do  # we need 'f' for the right order
    res=$(egrep '\.so(\..*)? \(deleted\)$' /proc/$pid/maps 2>/dev/null)
    if test $? -eq 0; then
        ppid=$(awk '{print $4}' /proc/$pid/stat)
        shown="$shown $pid "

        # If not verbose, and parentpid is not 1 (in case we've already shown
        # /sbin/init) and we've already shown the parent, then don't show it.
        if test $verbose -eq 0 -a $ppid != 1 && echo "$shown" | grep -q " $ppid "; then
            continue
        fi

        toshow="$toshow,$pid"
        if test $verbose -ge 2; then
            cmdline=$(sed -e 's/\x00/ /g' /proc/$pid/cmdline)
            printf "PID $pid $cmdline\n"
            echo "$res" | sed -e "s/^/    $pid /"
            echo 
        fi
    fi
done

if test $verbose -le 1 -a -n "$toshow"; then
    ps $options_to_ps -p $(echo "$toshow" | sed -e 's/^.//')
fi

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