postinstall.in

#!/bin/bash

set -e

user="@PRIVSEP_USER@"
group="@PRIVSEP_GROUP@"

dscl=/usr/bin/dscl
$dscl . -read "/Users/${user}" &> /dev/null || {
    # We need to find a free UID/GID
    uid=200
    while $($dscl . -list /Users uid | grep -q "\b${uid}$") || \
        $($dscl . -list /Users gid | grep -q "\b${uid}$"); do
        uid=$((${uid} + 1))
    done
    $dscl . -create /Groups/${group}
    $dscl . -create /Groups/${group} PrimaryGroupID ${uid}
    $dscl . -create /Groups/${group} Password "*"
    $dscl . -create /Groups/${group} RealName "lldpd privilege separation group"
    $dscl . -create /Users/${user}
    $dscl . -create /Users/${user} UserShell /usr/bin/false
    $dscl . -create /Users/${user} NFSHomeDirectory /var/empty
    $dscl . -create /Users/${user} PrimaryGroupID ${uid}
    $dscl . -create /Users/${user} UniqueID ${uid}
    $dscl . -create /Users/${user} Password "*"
    $dscl . -create /Users/${user} RealName "lldpd privilege separation user"
}

/bin/launchctl load "/Library/LaunchDaemons/im.bernat.lldpd.plist"